Evaluation method of subsurface structure, evaluation system of subsurface structure, calculation program, and subsurface structure

Abstract

To provide an evaluation method of a subsurface structure capable of comprehending a detailed state without requiring large-scale construction.SOLUTION: An evaluation method comprises the steps of: producing a digital model of a pile foundation 10; measuring data during a specific period with a measuring device 20 including a distortion measuring device or a stress measuring device on at least one of places of a body of the pile foundation 10 and a dummy member 11A of the pile foundation 10; updating the digital model on the basis of the data to bring it closer to a state of the actual pile foundation 10; and carrying out simulation using the digital model. The simulation is performed to acquire at lease one evaluation result of a first evaluation to comprehend a state of a present actual pile foundation 10, a second evaluation to predict a state of an actual pile foundation 10 after experiencing potential events after the present time, and a third evaluation to comprehend a state of a previous actual pile foundation 10.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an underground structure evaluation method, an underground structure evaluation system, a calculation program, and an underground structure. [Background technology]

[0002] Conventionally, it is difficult to check the condition of underground structures such as pile foundations because they are installed underground. Therefore, the ground is widely excavated with heavy machinery, or the superstructure above the pile foundation is dismantled, and the condition is checked visually or with a camera. However, these are large-scale construction works that require a lot of time and money. In addition, it is possible to apply the constant monitoring that is currently carried out by installing measuring devices on the aboveground parts of structures such as bridges and buildings to the underground piles as well, and by continuing to monitor them throughout the life of the structure, it is possible to understand the condition of the piles.

[0003] However, the service life of a structure is often long, for example, 50 years, and constant monitoring during that time is unrealistic in terms of cost and effort, and there is a high risk that the measuring device will break down or deteriorate during such long-term measurements, and since the piles are underground and it is very difficult to repair the measuring device when it breaks down or deteriorates, it is difficult to adopt a method of constant monitoring. In view of this situation, for example, Patent Documents 1 to 4 propose a method for cheaply and easily checking the condition of pile foundations without large-scale construction work.

[0004] Patent Document 1 shows a method in which a pile is installed in the ground, then vibrated with a vibration exciter to obtain the initial natural frequency of the pile, and after a disaster such as an earthquake, the pile head is exposed again and vibrated with the vibration exciter to obtain the natural frequency, and the degree of damage to the pile is grasped from the change in the initial natural frequency. However, if there is a superstructure on the pile foundation, it is necessary to expose the pile head by excavating the ground or partially dismantling the superstructure, and although the scale of construction is limited compared to conventional visual inspection or camera-based inspection, it still requires relatively large construction work.

[0005] Patent Document 2 discloses a method in which a model of a pile foundation is created in advance, multiple seismic waves are applied to the model to calculate the relationship between the inclination angle of the pile foundation and the damage ratio, and after the actual pile foundation is damaged by an earthquake, the inclination angle of the pile foundation is measured on-site, and the damage ratio of the pile foundation is estimated based on the relationship calculated in advance from the inclination angle. Furthermore, Patent Document 3 discloses a method of evaluating the degree of damage to a concrete pile foundation by installing an acceleration sensor on the superstructure side instead of on the pile foundation and calculating vibration frequency from the measured value. However, the methods of Patent Documents 2 and 3 do not check the correspondence between the actual pile foundation and the model, which means there is a possibility of a discrepancy between the two, and there is a problem in that the accuracy of understanding the condition using the model cannot be guaranteed.

[0006] In response to this, Patent Document 4 shows a method of measuring the microtremors of the actual pile head and ground, correcting a model of the pile foundation based on the measured values, matching the actual object with the model, and evaluating the performance of the pile foundation using the model. The method in Patent Document 4 includes a process of correcting the model to correspond to the actual object after constructing the pile foundation on-site. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2011-220003 A [Patent Document 2] JP 2007-39879 A [Patent Document 3] JP 2022-113191 A [Patent Document 4] JP 2018-24985 A Summary of the Invention [Problem to be solved by the invention]

[0008] However, all of the conventional methods in Patent Documents 1 to 4 are limited to grasping the presence and extent of pile damage using the natural frequency and inclination angle. Therefore, there is a problem in that it is not possible to grasp detailed conditions such as the pile damage distribution (planar position, depth position), stress distribution (bending moment, shear force, axial force), strain distribution, and stiffness distribution, and there is room for improvement in this respect.

[0009] The present invention has been made in consideration of the above-mentioned problems, and aims to provide an underground structure evaluation method, an underground structure evaluation system, a calculation program, and an underground structure that can grasp detailed conditions without requiring large-scale construction. [Means for solving the problem]

[0010] (1) Aspect 1 of the underground structure evaluation method of the present invention is a method for evaluating the state of an underground structure, comprising the steps of creating a digital model of the underground structure, measuring data for a certain period of time using a measuring device including a strain measuring device or a stress measuring device installed in at least one of the main body of the underground structure and a dummy member of the underground structure, updating the digital model based on the data to bring it closer to the actual state of the underground structure, and performing a simulation using the digital model, and is characterized in that by performing the simulation, at least one evaluation result is obtained from a first evaluation that grasps the current actual state of the underground structure, a second evaluation that predicts the actual state of the underground structure after experiencing events that may occur from the present onwards, and a third evaluation that grasps the actual state of the underground structure in the past.

[0011] The present invention makes it possible to grasp the actual condition of an underground structure by simulating it on a digital model, thereby making it possible to grasp the condition of the underground structure without carrying out large-scale construction work on-site. Furthermore, in the present invention, since the digital model is made to correspond to the actual object based on measurement data of the actual object, the digital model accurately represents the actual object, and the condition of the actual object can be grasped with high accuracy on the digital model. In addition, in the present invention, since the strain of the actual underground structure is measured and corresponds to the digital model, it is possible to grasp the detailed condition of the underground structure, such as the damage distribution (planar position, depth position), stress distribution (bending moment, shear force, axial force), strain distribution, and rigidity distribution. This makes it possible to know in detail the remaining strength of the underground structure considering damage caused by earthquakes and gusts of wind, the impact on the underground structure of load changes caused by rebuilding or reinforcing the upper structure, and the deterioration state of the underground structure due to aging, which can be used to make specific decisions such as continued use, repair, reinforcement, and demolition of the underground structure. Furthermore, in the present invention, by initially creating a digital model without using measurement data of the actual underground structure, construction of an evaluation system for the underground structure can be started regardless of the construction status or measurement status of the actual structure, and this allows for flexibility in dispersing the workload of system construction. A design model for the construction of an underground structure can also be used as the digital model in the present invention, reducing the workload of constructing the evaluation system.

[0012] (2) In a second aspect of the present invention, in the method for evaluating an underground structure of the first aspect, it is preferable that the underground structure supports an upper structure.

[0013] In this case, it is difficult to grasp the condition of the underground structure supporting the superstructure because the superstructure is installed above, but according to the present invention, the actual condition can be grasped by simulating the digital model, and the condition of the underground structure can be grasped without carrying out large-scale construction work on site. Therefore, when checking the condition of the underground structure, it is no longer necessary to go through the great effort required for dismantling the superstructure as in the past.

[0014] (3) A third aspect of the present invention may be characterized in that in the method for evaluating an underground structure according to the first or second aspect, the underground structure is a pile foundation.

[0015] In this case, it is difficult to grasp the condition of the underground structure because the superstructure is installed above the pile foundation and it is long downward, but according to the present invention, the actual condition can be grasped by simulating it on a digital model, and the condition of the pile foundation can be grasped without carrying out large-scale construction work on site. Therefore, when checking the condition of the pile foundation, it is no longer necessary to go through the great effort required for dismantling the superstructure and excavating deep to expose the piles, as in the past.

[0016] (4) A fourth aspect of the present invention may be characterized in that, in the evaluation method for an underground structure of any one of aspects 1 to 3, the underground structure includes a steel material and the measurement device includes a corrosion measurement device.

[0017] In this case, the digital model is made to correspond to the actual object based on corrosion measurement data of the underground structure, including steel, measured by a corrosion measuring device. Therefore, the digital model accurately represents the actual object, including the amount of metal loss due to corrosion, and the condition of the actual object can be grasped more accurately on the digital model through simulation.

[0018] (5) Aspect 5 of the underground structure evaluation method of the present invention is a method for evaluating the state of an underground structure, comprising the steps of: measuring data for a certain period of time using a measuring device including a strain measuring device or a stress measuring device installed in at least one of the main body of the underground structure and a dummy member of the underground structure; creating a digital model reflecting the actual state of the underground structure based on the data; and performing a simulation using the digital model, wherein a step of updating the digital model based on the data to bring it closer to the actual state of the underground structure is optional, and the simulation is characterized in that at least one evaluation result is obtained from a first evaluation that grasps the current actual state of the underground structure, a second evaluation that predicts the actual state of the underground structure after experiencing events that may occur from the present onwards, and a third evaluation that grasps the actual state of the underground structure in the past.

[0019] The present invention makes it possible to grasp the actual condition of an underground structure by simulating it on a digital model, thereby making it possible to grasp the condition of the underground structure without carrying out large-scale construction work on-site. Furthermore, in the present invention, since the digital model is made to correspond to the actual object based on measurement data of the actual object, the digital model accurately represents the actual object, and the condition of the actual object can be grasped with high accuracy on the digital model. In addition, in the present invention, the strain of the actual underground structure is measured and the digital model is made to correspond to the measured strain, so that it is possible to grasp the detailed condition of the underground structure, such as the damage distribution (planar position, depth position), stress distribution (bending moment, shear force, axial force), strain distribution, and rigidity distribution. This makes it possible to know in detail the remaining strength of the underground structure considering the damage caused by earthquakes and gusts of wind, the impact on the underground structure of load changes caused by rebuilding or reinforcing the upper structure, and the deterioration state of the underground structure due to aging, which can be used to make specific decisions such as the continued use, repair, reinforcement, and demolition of the underground structure. Furthermore, in the present invention, by initially creating a digital model based on measurement data of the actual underground structure, the initial digital model can be created to reflect the actual state, thereby reducing the workload involved in constructing the evaluation system. In this case, since the actual state is reflected in the initial digital model, a process of updating the digital model to make it closer to the actual state may or may not be required.

[0020] (6) In a sixth aspect of the present invention, in the method for evaluating an underground structure of the fifth aspect, it is preferable that the underground structure supports an upper structure.

[0021] In this case, it is difficult to grasp the condition of the underground structure supporting the superstructure because the superstructure is installed above, but according to the present invention, the actual condition can be grasped by simulating the digital model, and the condition of the underground structure can be grasped without carrying out large-scale construction work on-site. Therefore, when checking the condition of the underground structure, it is no longer necessary to go through the extensive work required for dismantling the superstructure, as was previously required.

[0022] (7) In a seventh aspect of the present invention, in the method for evaluating an underground structure according to the fifth or sixth aspect, it is preferable that the underground structure is a pile foundation.

[0023] In this case, since the pile foundation has a superstructure installed above and is long downward, it is difficult to grasp the condition of the underground structure, but according to the present invention, the actual condition can be grasped by simulating it on a digital model, and the condition of the pile foundation can be grasped without carrying out large-scale construction work on site. Therefore, when checking the condition of the pile foundation, it is no longer necessary to go through the great effort required for dismantling the superstructure, digging deep to expose the piles, etc., as in the past.

[0024] (8) Aspect 8 of the present invention may be characterized in that, in the evaluation method for an underground structure of any one of aspects 5 to 7, the underground structure includes a steel material and the measurement device includes a corrosion measurement device.

[0025] In this case, the digital model is made to correspond to the actual object based on corrosion measurement data of the actual underground structure, including steel, measured by a corrosion measuring device. Therefore, the digital model accurately represents the actual object, including the amount of metal loss due to corrosion, and the condition of the actual object can be grasped more accurately on the digital model through simulation.

[0026] (9) In aspect 9 of the present invention, in the method for evaluating an underground structure of any one of aspects 1 to 8, it is preferable that the digital model is updated even after a certain period of time has elapsed after the construction of the actual underground structure.

[0027] In this case, the degree of correspondence between the digital model of the underground structure and the actual thing can change due to changes in the actual underground structure and ground over time, even if there is no clear change in condition due to damage from a major earthquake, rebuilding of the superstructure, etc. Therefore, by updating the digital model to take into account the initial deviation immediately after the construction of the actual underground structure, as well as the deviation that accompanies subsequent changes in the actual thing over time, it becomes possible to grasp the actual condition of the digital model more accurately.

[0028] (10) Aspect 10 of the present invention may be characterized in that, in the evaluation method for an underground structure of any one of aspects 1 to 9, the digital model is updated after a first earthquake in which the underground structure is damaged.

[0029] In this case, after the first earthquake that damages the underground structure, the digital model can be updated based on measurement data from the time of the disaster, making it possible to construct a digital model that is closer to the actual state of the underground structure.

[0030] (11) Aspect 11 of the present invention may be characterized in that, in the method for evaluating an underground structure of any one of aspects 1 to 10, after grasping or predicting the actual state of the underground structure, only the digital model is re-updated based on the results of the simulation, and a further simulation is performed using the re-updated digital model to obtain the evaluation results and grasp the actual state of the underground structure.

[0031] In this case, even if the measuring device attached to the actual underground structure reaches the end of its life or breaks down and it is not possible to update the digital model based on the measurement data, the digital model can be updated based only on the simulation results to grasp the actual state of the underground structure. For example, when a simulation is performed using a digital model and the underground structure is damaged on the digital model, the digital model can be updated to reflect that damage.

[0032] (12) In a twelfth aspect of the present invention, in the method for evaluating an underground structure according to any one of the first to eleventh aspects, it is preferable that the data measured by the measuring device is compiled into a database.

[0033] In this case, by storing the measurement data in a database, it is possible to track the damage history and changes over time of the underground structure. Also, by analyzing the database, it is possible to clarify the damage mechanism of the underground structure and predict its deterioration. Furthermore, by using the database, it is possible to predict damage and evaluate the remaining strength of similar underground structures other than the one being measured.

[0034] (13) In aspect 13 of the present invention, in the evaluation method for an underground structure of any one of aspects 1 to 12, it is preferable that repair and reinforcement specifications are designed based on the evaluation results indicating the actual condition of the underground structure.

[0035] In this case, repair and reinforcement specifications can be designed for the underground structure based on the results of evaluating the actual condition of the underground structure through simulation of the digital model, making it possible to simply and appropriately select specifications to increase the safety of the underground structure.

[0036] (14) In aspect 14 of the present invention, in the evaluation method for an underground structure of any one of aspects 2, 3, 4, 6, 7, or 8, it is preferable that the evaluation results are used to reuse part or all of the underground structure when the superstructure is reconstructed.

[0037] In this case, the condition of the underground structure can be easily and accurately grasped, which can be useful for designing the reuse of existing piles. Therefore, as the construction stock increases, the need for reuse of existing piles can be met.

[0038] (15) Aspect 15 of the present invention preferably comprises, in the evaluation method for an underground structure of any one of aspects 1 to 14, the steps of inputting external force information due to a disaster including an earthquake or tsunami into the digital model when the disaster occurs, simulating the disaster using the digital model, and displaying or outputting the results of the disaster simulation.

[0039] In this case, when a disaster such as an earthquake or tsunami occurs, external force information about the disaster is input into the digital model, and by running a simulation, it is possible to grasp the damage caused to underground structures by the disaster. The results of the simulation can then be displayed or output to help determine the continued usability of the underground structures, as well as whether or not repairs are necessary. This series of steps may be performed manually by a human being, but it is more convenient if it is mechanically automated by an automatic program or the like.

[0040] (16) In aspect 16 of the present invention, in the method for evaluating an underground structure of aspect 15, it is preferable to perform at least one of the following means based on the results of the simulation: a means for determining the continued usability of the underground structure, a means for issuing an evacuation order, a means for calculating materials required for repair or reinforcement, and a means for arranging materials required for repair or reinforcement.

[0041] In this case, by taking at least one or more of the following measures based on the simulation results, such as determining whether the underground structure can continue to be used, issuing evacuation orders, calculating the materials needed for repairs and reinforcement, and arranging for the materials needed for repairs and reinforcement, it is possible to more reliably, quickly, and with less workload to restore the underground structure after a disaster and protect human lives.

[0042] (17) In aspect 17 of the present invention, in the method for evaluating an underground structure of any one of aspects 1 to 16, it is preferable to create another digital model of a structure other than the underground structure based on the digital model, and use the other digital model to obtain at least one evaluation result from among a fourth evaluation that grasps the current actual state of the structure other than the underground structure, a fifth evaluation that predicts the actual state of the structure other than the underground structure after experiencing an event that may occur from the present onwards, and a sixth evaluation that grasps the actual state of the structure other than the underground structure in the past.

[0043] In this case, by creating a digital model of another underground structure based on the digital model of the underground structure to be measured, it is possible to grasp the current actual state of the structure other than the underground structure to be measured, or to predict the actual state of the structure other than the underground structure after experiencing an event that may occur from now on, or to grasp the actual state of the structure other than the underground structure in the past. The more similar the underground structure to be measured and the structure other than the underground structure to be measured are, the higher the accuracy of the simulation by the digital model is, which is preferable. By utilizing such a method, it is possible to grasp the state of underground structures over a wide area.

[0044] (18) Aspect 18 of the present invention may be characterized in that, in the underground structure evaluation method of aspect 17, after grasping or predicting the actual state of structures other than the underground structure, only the other digital model is re-updated based on the results of the simulation, and a further simulation is performed using the re-updated other digital model to obtain the evaluation results and grasp the actual state of structures other than the underground structure.

[0045] In this case, even if the measuring device attached to the structure other than the actual underground structure reaches the end of its life or breaks down and it is not possible to update the digital model based on the measurement data, it is possible to update the digital model based only on the simulation results and grasp the actual state of the structure other than the underground structure. For example, when a simulation is performed using the digital model and a structure other than the underground structure is damaged on the digital model, the digital model can be updated to reflect that damage.

[0046] (19) Aspect 19 of the present invention preferably comprises, in the evaluation method for underground structures of aspect 17, the steps of: inputting external force information due to a disaster including an earthquake or tsunami into at least one of the digital model and the other digital model when a disaster including an earthquake or tsunami occurs; simulating the disaster using the digital model; and displaying or outputting the results of the disaster simulation.

[0047] In this case, when a disaster such as an earthquake or tsunami occurs, external force information of the disaster is input into at least one of the digital model of the wide-area underground structure and the other digital model, and a simulation can be performed to grasp the damage caused to the wide-area underground structure by the disaster. The results of the simulation can be displayed or output, which can be useful for determining the continued usability of the wide-area underground structure, repairs, and determining whether repairs are necessary. This series of steps may be performed manually by a human being, but it is more convenient if it is mechanically automated by an automatic program or the like.

[0048] (20) In aspect 20 of the present invention, in the method for evaluating an underground structure of aspect 19, it is preferable to perform at least one of the following means based on the results of the simulation: a means for determining the continued usability of the underground structure, a means for issuing an evacuation order, a means for calculating materials required for repairs or reinforcement, and a means for arranging materials required for repairs or reinforcement.

[0049] In this case, by performing at least one of the following based on the simulation results: determining the continued usability of underground structures over a wide area, issuing evacuation orders, calculating the materials needed for repairs and reinforcement, and arranging for the materials needed for repairs and reinforcement, it will be possible to more reliably, quickly, and with less workload to restore underground structures over a wide area and protect human lives after a disaster.

[0050] (21) Aspect 21 of the underground structure evaluation system of the present invention is an underground structure evaluation system that evaluates the state of an underground structure, comprising a first processing unit that creates a digital model of the underground structure, a measuring device including a strain measuring device or a stress measuring device that is installed in at least one location of the main body of the underground structure and a dummy member of the underground structure, a second processing unit that measures data for a certain period of time using the measuring device, a third processing unit that updates the digital model based on the data to bring it closer to the actual state of the underground structure, and a fourth processing unit that performs a simulation using the digital model, and is characterized in that by performing the simulation in the fourth processing unit, at least one evaluation result is obtained from a first evaluation that grasps the current actual state of the underground structure, a second evaluation that predicts the actual state of the underground structure after experiencing events that may occur from the present onwards, and a third evaluation that grasps the actual state of the underground structure in the past.

[0051] In this case, it is possible to provide an evaluation system for underground structures having the effects described above.

[0052] (22) A twenty-second aspect of the present invention may be characterized in that, in the underground structure evaluation method of the twenty-first aspect, the underground structure includes a steel material, and the measurement device includes a corrosion measurement device.

[0053] In this case, the digital model is made to correspond to the actual object based on corrosion measurement data of the underground structure, including steel, measured by a corrosion measuring device. Therefore, the digital model accurately represents the actual object, including the amount of metal loss due to corrosion, and the condition of the actual object can be grasped more accurately on the digital model through simulation.

[0054] (23) Aspect 23 of the underground structure evaluation system of the present invention is an underground structure evaluation system for evaluating the state of an underground structure, comprising a measuring device including a strain measuring device or a stress measuring device installed in at least one location of the main body of the underground structure and a dummy member of the underground structure, a fifth processing unit that measures data for a certain period of time using the measuring device, a sixth processing unit that creates a digital model reflecting the actual state of the underground structure based on the data, and a seventh processing unit that performs a simulation using the digital model, and an eighth processing unit that updates the digital model based on the data to bring it closer to the actual state of the underground structure is selectively provided, and the simulation is performed in the seventh processing unit to obtain at least one evaluation result from a first evaluation that grasps the current actual state of the underground structure, a second evaluation that predicts the actual state of the underground structure after experiencing events that may occur from the present onwards, and a third evaluation that grasps the actual state of the underground structure in the past.

[0055] In this case, it is possible to provide an evaluation system for underground structures having the effects described above.

[0056] (24) A twenty-fourth aspect of the present invention may be characterized in that, in the method for evaluating an underground structure of the twenty-third aspect, the underground structure includes a steel material, and the measuring device includes a corrosion measuring device.

[0057] In this case, the digital model is made to correspond to the actual object based on corrosion measurement data of the underground structure, including steel, measured by a corrosion measuring device. Therefore, the digital model accurately represents the actual object, including the amount of metal loss due to corrosion, and the condition of the actual object can be grasped more accurately on the digital model through simulation.

[0058] (25) Aspect 25 of the calculation program of the present invention is a calculation program that executes on a computer the evaluation method for an underground structure of any one of aspects 1 to 4, and executes the following steps: creating a digital model of the underground structure; installing a measuring device including a strain measuring device or a stress measuring device in at least one location of the main body of the underground structure and a dummy member of the underground structure, inputting data measured by the measuring device for a certain period of time; updating the digital model based on the data to bring it closer to the actual state of the underground structure; and performing a simulation using the digital model, and is characterized in that in the step of performing the simulation, at least one evaluation result is obtained from a first evaluation that grasps the current actual state of the underground structure, a second evaluation that predicts the actual state of the underground structure after experiencing events that may occur from the present onwards, and a third evaluation that grasps the actual state of the underground structure in the past.

[0059] In this case, it is possible to provide a calculation program that can execute the underground structure evaluation method having the above-mentioned effects on a computer.

[0060] (26) Aspect 26 of the present invention may be characterized in that, in the evaluation method for underground structures of aspect 25, when a disaster including an earthquake or tsunami occurs, the following steps are executed: inputting external force information due to the disaster into the digital model; simulating the disaster using the digital model; and displaying or outputting the results of the disaster simulation.

[0061] In this case, when a disaster such as an earthquake or tsunami occurs, external force information about the disaster is input into the digital model, and by running a simulation, it is possible to grasp the damage caused to underground structures by the disaster. The results of the simulation can then be displayed or output to help determine the continued usability of the underground structures, as well as whether or not repairs are necessary.

[0062] (27) Aspect 27 of the present invention may be characterized in that, in the evaluation method for underground structures of aspect 26, at least one of the following steps may be executed: a step of determining the continued usability of the underground structure based on the results of the simulation, a step of outputting an evacuation order, a step of calculating and outputting materials required for repairs and reinforcement, and a step of outputting materials required for repairs and reinforcement.

[0063] In this case, by executing at least one or more steps based on the simulation results, including determining whether the underground structure can continue to be used, issuing evacuation orders, calculating the materials needed for repairs and reinforcement, and arranging for the materials needed for repairs and reinforcement, it is possible to more reliably, quickly, and with less workload to restore the underground structure after a disaster and to protect human lives.

[0064] (28) Aspect 28 of the calculation program of the present invention is a calculation program that executes on a computer the evaluation method for an underground structure according to any one of aspects 5 to 8, wherein a measuring device including a strain measuring device or a stress measuring device is installed in at least one location of the main body of the underground structure and a dummy member of the underground structure, and the program executes the steps of inputting data measured by the measuring device for a certain period of time, creating a digital model reflecting the actual state of the underground structure based on the data, and performing a simulation using the digital model, and is selectively provided with a step of updating the digital model based on the data to bring it closer to the actual state of the underground structure, and is characterized in that in the step of performing the simulation, at least one evaluation result is obtained from a first evaluation that grasps the current actual state of the underground structure, a second evaluation that predicts the actual state of the underground structure after experiencing events that may occur from the present onwards, and a third evaluation that grasps the actual state of the underground structure in the past.

[0065] In this case, it is possible to provide a calculation program that can execute the underground structure evaluation method having the above-mentioned effects on a computer.

[0066] (29) Aspect 29 of the present invention may be characterized in that, in the evaluation method for underground structures of aspect 28, when a disaster including an earthquake or tsunami occurs, the following steps are executed: inputting external force information due to the disaster into the digital model; simulating the disaster using the digital model; and displaying or outputting the results of the disaster simulation.

[0067] In this case, when a disaster such as an earthquake or tsunami occurs, external force information about the disaster is input into the digital model, and by running a simulation, it is possible to grasp the damage caused to underground structures by the disaster. The results of the simulation can then be displayed or output to help determine the continued usability of the underground structures, as well as whether or not repairs are necessary.

[0068] (30) Aspect 30 of the present invention may be characterized in that, in the evaluation method for underground structures of aspect 29, at least one of the following steps may be executed: a step of determining the continued usability of the underground structure based on the results of the simulation, a step of outputting an evacuation instruction, a step of calculating and outputting materials required for repairs and reinforcement, and a step of outputting materials required for repairs and reinforcement.

[0069] In this case, by executing at least one or more steps based on the simulation results, including determining whether the underground structure can continue to be used, issuing evacuation orders, calculating the materials needed for repairs and reinforcement, and arranging for the materials needed for repairs and reinforcement, it is possible to more reliably, quickly, and with less workload to restore the underground structure after a disaster and to protect human lives.

[0070] (31) Aspect 31 of the computation program of the present invention is a computation program for executing on a computer any one of the underground structure evaluation methods of aspects 1 to 8, characterized in that it executes the steps of creating another digital model of a structure other than the underground structure based on the digital model, and using the other digital model to obtain and output at least one evaluation result from a fourth evaluation for grasping the current actual state of the structure other than the underground structure, a fifth evaluation for predicting the actual state of the structure other than the underground structure after experiencing an event that may occur from the present onwards, and a sixth evaluation for grasping the actual state of the structure other than the underground structure in the past.

[0071] In this case, by creating a digital model of another underground structure based on the digital model of the underground structure to be measured, it is possible to grasp the current actual state of the structure other than the underground structure to be measured, or to predict the actual state of the structure other than the underground structure after experiencing an event that may occur from now on, or to grasp the actual state of the structure other than the underground structure in the past. The more similar the underground structure to be measured and the structure other than the underground structure to be measured are, the higher the accuracy of the simulation by the digital model is, which is preferable. By utilizing such a method, it is possible to grasp the state of underground structures over a wide area.

[0072] (32) Aspect 32 of the calculation program of the present invention may be characterized in that, in the calculation program of aspect 31, when a disaster including an earthquake or tsunami occurs, the calculation program executes the steps of inputting external force information caused by the disaster to at least one of the digital model and the other digital model, simulating the disaster using the digital model, and displaying or outputting results of the simulation of the disaster.

[0073] In this case, when a disaster such as an earthquake or tsunami occurs, external force information of the disaster is input into at least one of the digital model of the wide-area underground structure and the other digital model, and a simulation can be performed to grasp the damage caused to the wide-area underground structure by the disaster. The results of the simulation can be displayed or output, which can be useful for determining the continued usability of the wide-area underground structure, repairs, and determining whether repairs are necessary.

[0074] (33) Aspect 33 of the calculation program of the present invention may be characterized in that, in the calculation program of aspect 32, at least one of the following steps is executed: a step of determining the continued usability of the underground structure based on the results of the simulation, a step of outputting an evacuation instruction, a step of calculating and outputting materials required for repairs and reinforcement, and a step of outputting the materials required for repairs and reinforcement so that they can be arranged.

[0075] In this case, by performing at least one of the following based on the simulation results: determining the continued usability of underground structures over a wide area, issuing evacuation orders, calculating the materials needed for repairs and reinforcement, and arranging for the materials needed for repairs and reinforcement, it will be possible to more reliably, quickly, and with less workload to restore underground structures over a wide area and protect human lives after a disaster.

[0076] (34) Aspect 34 of the underground structure of the present invention is characterized in that it is configured to be capable of performing any one of the underground structure evaluation methods of aspects 1 to 20, and the evaluation results are obtained.

[0077] (35) Aspect 35 of the underground structure of the present invention is characterized in that it is equipped with the evaluation system of aspect 21 or aspect 22, and the evaluation results are obtained.

[0078] (36) Aspect 36 of the underground structure of the present invention is characterized in that it is equipped with the evaluation system of aspect 23 or aspect 24, and the evaluation results are obtained.

[0079] (37) Aspect 37 of the underground structure of the present invention is characterized in that it is equipped with the evaluation system of aspect 25 and the evaluation results are obtained.

[0080] (38) Aspect 38 of the underground structure of the present invention is characterized in that it is equipped with the evaluation system of aspect 28 and the evaluation results are obtained.

[0081] (39) Aspect 39 of the underground structure of the present invention is characterized in that it is equipped with the evaluation system of aspect 31 and the evaluation results are obtained. Effect of the Invention

[0082] The underground structure evaluation method, underground structure evaluation system, calculation program, and underground structure of the present invention make it possible to grasp detailed conditions without requiring large-scale construction work. [Brief description of the drawings]

[0083] [Figure 1] 1 is a side view showing a schematic diagram of a structure having a pile foundation to which the underground structure evaluation method of the first embodiment of the present invention is applied. [Diagram 2] FIG. 2 shows a digital model of the structure shown in FIG. 1. [Diagram 3] FIG. 1 is a first flowchart showing an evaluation procedure. [Figure 4] FIG. 2 is a second flowchart showing the evaluation procedure. [Diagram 5] FIG. 11 is a third flowchart showing the evaluation procedure. [Figure 6] This figure shows an example of bending strain that occurs in a steel pipe pile when it is subjected to a small to medium-sized earthquake, where (a) shows the correspondence between the initial digital model and the actual object, and (b) shows the correspondence between the digital model and the actual object after being updated based on one year of measurement data. [Figure 7] FIG. 13 is a diagram showing an example of bending strain that will occur in a steel pipe pile due to a major earthquake anticipated in the future, and is a diagram showing the damage state when an actual pile foundation is hit by an earthquake in a simulation. [Figure 8] FIG. 11 is a flow diagram of a simulated example of use. [Figure 9] FIG. 11 is a fourth flowchart showing the evaluation procedure according to the second embodiment. [Figure 10] FIG. 13 is a fifth flowchart showing an evaluation procedure according to the second embodiment. [Figure 11] FIG. 13 is a diagram showing the relationship between the amount of corrosion thinning and the elapsed time according to the first fitting method of the fourth embodiment. [Figure 12] FIG. 13 is a diagram showing the relationship between the amount of corrosion thinning and the elapsed time, according to the second fitting method of the fourth embodiment, in the case where there is a change in the corrosion rate due to an environmental change or the like during a corrosion measurement period. [Figure 13] FIG. 13 is a diagram showing the relationship between the amount of corrosion thinning and elapsed time by the third fitting method of the fourth embodiment in the case where there is a change in the corrosion rate due to an environmental change or the like outside the corrosion measurement period. [Figure 14]This figure shows an example of the estimated amount of corrosion thinning at each location in a pile foundation 40 years after construction. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0084] Hereinafter, an underground structure evaluation method, an underground structure evaluation system, a calculation program, and an underground structure according to an embodiment of the present invention will be described with reference to the drawings.

[0085] (First embodiment) The method for evaluating underground structures according to this embodiment involves installing a measuring device 20 for measuring the detailed condition of a pile foundation 10 (underground structure) as shown in Figure 1, measuring data D over a certain period of time, and matching a digital model M1 of the pile foundation 10 shown in Figure 2 with actual data 1 based on the data D, and performing a simulation on the digital model M1 to evaluate the pile foundation 10 to grasp the actual condition.

[0086] A pile foundation 10, which represents the underground structure to be evaluated, is installed in the ground G and supports a superstructure 13, such as an apartment building or a building, from below. The pile foundation 10 comprises multiple piles 11 (four are shown in FIG. 1) and a foundation bed 12 that is installed on the ground surface and supported by the multiple piles 11. The superstructure 13 is placed on the foundation bed 12. The digital model M1 shown in FIG. 2 shows an example in which a pile foundation 10 (including a foundation bed 12) and a superstructure 13 are digitally modeled.

[0087] The structure refers to only the superstructure, only the underground structure, or a structure including both the superstructure and the underground structure. The superstructure 13 is not limited to an architectural structure as in this embodiment, but also includes civil engineering structures such as bridges (road bridges, railway bridges) and port facilities.

[0088] Furthermore, the underground structure is not limited to the pile foundation 10 of this embodiment, but includes underground structures constructed underground (including below the ground surface) such as spread foundations, caisson foundations, steel sheet piles, steel pipe sheet piles, ports, river levees, reservoir levees, tunnels, piping, and underground spaces.

[0089] The pile foundation 10 is, for example, a steel pipe pile having an outer diameter of 1200 mm, a plate thickness of 20 mm, and made of SKK490 material. The pile foundation 10 may also be made of a steel pipe pile (including a CFT (Concrete Filled Steel Tube) pile), or an RC pile (PHC pile, PRC pile, SC pile, cast-in-place concrete pile, cast-in-place concrete pile wrapped in steel pipe, etc.). Steel pipe piles (including CFT piles) are preferably used because their structural characteristics are simpler than those of RC piles, making it easy to measure the actual object and to easily match it with the digital model M1.

[0090] <Evaluation method for pile foundations> As shown in Figures 3 to 5, the evaluation method for the pile foundation 10 includes the steps of creating a digital model M1 of the pile foundation 10 (step S1), installing a measuring device 20 including a strain measuring device 21 or a stress measuring device in at least one location on the main body of the pile foundation 10 and the dummy member 11A, and measuring data D for a certain period of time with the measuring device 20 (step S2), updating the digital model M1 based on the data D to bring it closer to the actual state of the pile foundation 10 (step S3), and performing a simulation using the digital model M1 (step S4).

[0091] The first flowchart shown in Fig. 3 is an example of an evaluation procedure in which the step of creating a digital model M1 (step S1) precedes the step of measuring data D (step S2). The second flowchart shown in Fig. 4 is an example of an evaluation procedure in which the step of measuring data D (step S2) precedes the step of creating a digital model M1 (step S1). The third flowchart shown in Fig. 5 is an example of an evaluation procedure in which the step of measuring data D (step S2) and the step of creating a digital model M1 (step S1) are performed in parallel.

[0092] Here, the dummy member 11A is, for example, a steel pipe pile having an outer diameter of 1200 mm, a plate thickness of 20 mm, and made of SKK490, which is the same as the piles 11 of the pile foundation 10. The dummy member 11A may be made of a different material, shape, and cross-section from the piles 11, but is preferably made of the same material, shape, and cross-section as the piles 11. The dummy member 11A may be installed independently on the ground G around the pile foundation 10, or may be connected to the pile foundation 10.

[0093] <Digital model creation process> The digital model M1 of the pile foundation 10 created in step S1 will be described. As shown in FIG. 2, the digital model M1 is a beam-spring model in which the superstructure 13 and the piles 11 of the pile foundation 10 are modeled as beam elements (elastic plasticity), and the ground G is modeled as a spring element (elastic plasticity). The constraint condition of the pile head of the pile foundation 10 (the connection between the foundation bed 12 and the piles 11) is designed under a rotational fixed condition. The boundary condition of the lower end of the pile 11 is a horizontal pin roller. The beam-spring model used at the time of designing the construction of the pile foundation 10 is adopted as the digital model M1. For ease of understanding, the reference numerals written on the digital model M1 shown in FIG. 2 are the same as those of the actual superstructure 13 and pile foundation 10 (the piles 11 and foundation bed 12).

[0094] The digital model M1 shown in Figure 2 may be a beam-spring model, an FEM model, a hybrid model (beam model and FEM model), or other models, and may be a 2D model or a 3D model. When the digital model M1 is a beam-spring model, it is possible to easily build and update the model, and to easily perform simulations to grasp the pile damage distribution (planar position, depth position), stress distribution (bending moment, shear force, axial force), strain distribution, and stiffness distribution. When the digital model M1 is an FEM model, it is possible to perform more precise simulations.

[0095] The ground spring attached to the beam spring model may be selected from horizontal springs, vertical circumferential friction springs, etc. that match the actual conditions. The boundary condition of the pile bottom end of the beam spring model may be selected from horizontal pin rollers, vertical springs, etc. that match the actual conditions.

[0096] In addition, in the digital model M1, the superstructure 13 may or may not be modeled. In addition, the model used at the time of design may or may not be used as the digital model M1. In addition, even when an existing model, such as a model used at the time of design, is used as the digital model M1, the digital model M1 is considered to have been created in this embodiment.

[0097] <Actual data measurement process> Next, in step S2, actual measurements of the pile foundation 10 and the superstructure 13 will be described. The measurement items of the measuring device 20 include strain, stress, acceleration, velocity, displacement, rotation angle, corrosion, earth pressure, temperature, humidity, water pressure, water content, radiation concentration, seismic intensity, position, and the like.

[0098] The strain measuring device 20 employs a strain gauge, optical fiber, or the like. When a general metal strain gauge is used, strain can be measured inexpensively. When a plastic region gauge is used, it is possible to measure a large deformation region of about 10 to 15% strain. When a semiconductor strain gauge is used, it is possible to measure even very small strains caused by constant micromotion. When an optical fiber is used, it can be continuously attached to a structure, so strain can be measured as a linear distribution. The service life of a strain gauge depends on the measurement environment, but is thought to be limited to about several years. In addition, although optical fiber is a little expensive, it has the advantage of being resistant to electrical problems such as lightning strikes and being suitable for measuring outdoor structures, and even when a long-distance measurement cable is used, there is little attenuation and the measurement accuracy is not likely to decrease. Depending on the situation, it is possible to select which type of strain measuring device to adopt, or multiple types of strain measuring devices may be combined and adopted.

[0099] Stress measurement devices include those that use infrared rays or X-rays. As the measuring device 20, in addition to the strain measuring device 20, acceleration measuring device 22, and corrosion measuring device 23 of this embodiment, a speed measuring device, a displacement measuring device, a rotation angle measuring device, an earth pressure measuring device, a temperature measuring device (such as a thermocouple), a humidity measuring device, a water pressure measuring device, a water content measuring device, a radiation measuring device, a seismometer, a GPS, etc. can be used. By using the measured values ​​by these other measuring devices 20, the digital model M1 and the actual object can be updated with higher accuracy.

[0100] 1, the measuring devices 20 of this embodiment are installed on the superstructure 13, the actual bodies of the pile foundation 10, and the dummy member 11A. The measuring devices 20 include a strain measuring device 21, an acceleration measuring device 22, and a corrosion measuring device 23.

[0101] On the upper structure 13, strain measuring devices 21 are installed at predetermined intervals over the entire vertical direction, and acceleration measuring devices 22 are installed on the upper and lower parts. A plurality of strain measuring devices 21 are installed circumferentially at predetermined intervals on the piles 11 of the pile foundation 10 over the entire vertical direction, and an acceleration measuring device 22 and a corrosion measuring device 23 are arranged on the top. Since the heads of the piles 11 are designed under rotational fixed conditions, large strains and stresses are generated at the heads of the piles in the event of an earthquake disaster. For this reason, many strain measuring devices 21 are installed near the heads of the piles. Dummy member 11A has strain measuring devices 21, acceleration measuring devices 22, and corrosion measuring devices 23 installed in the same positions and in the same number as piles 11. That is, on dummy member 11A, a plurality of strain measuring devices 21 are installed at predetermined intervals in the circumferential direction over the entire vertical direction, and acceleration measuring devices 22 and corrosion measuring devices 23 are arranged on the upper part. Many strain measuring devices 21 are installed in the part of dummy member 11A that corresponds to the pile head. Note that the installation positions and numbers of dummy member 11A and piles 11 do not necessarily have to correspond (be the same) between them.

[0102] The measuring device 20 may be installed inside or outside the pile 11, and the installation location may be set according to the measurement items, measurement purpose, spatial constraints, etc. The measuring device 20 (strain measuring device 21, etc.) can be installed in a location in the structure where large stress / strain occurs and damage / destruction is predicted, for example, near the pile head in the case of a pile foundation 10 with a pile head rotation fixed condition, thereby enabling efficient data measurement. Furthermore, one or more measuring devices 20 may be installed. Furthermore, the measuring device 20 may be of the wired or wireless type. The measuring device 20 can be installed not only on the pile 11 but also on the foundation bed 12, the superstructure 13, and the dummy member 11A, depending on the measurement items, measurement purpose, spatial constraints, etc. For example, the measuring device 20 may be embedded in the concrete of the foundation bed 12. Furthermore, the measuring device 20 is not limited to being in contact with the object to be installed (no separation), but may be non-contact (separated). Whether separation is possible or not is determined by the type of measuring device 20. For example, among the measuring devices, the strain measuring device 20, the corrosion measuring device 23, the displacement measuring device, the rotation angle measuring device, and the GPS cannot be separated, while the acceleration measuring device 22, the velocity measuring device, the earth pressure measuring device, the temperature measuring device (such as a thermocouple), the humidity measuring device, the water pressure measuring device, the water content measuring device, the radiation measuring device, and the seismometer can be separated.

[0103] The timing for installing the measuring device 20 may be when constructing a new pile foundation 10 or superstructure 13, or it may be additionally installed on an existing pile foundation or superstructure. Moreover, the timing for starting the measurement may be immediately after the installation of the measuring device 20, or after a certain amount of time has passed. In step S2, the measuring device 20 measures data for a certain period of one year. The certain period of measurement by the measuring device 20 may be about two years, or may be longer or shorter than that. In this case, by measuring for a long period of time, the actual change over time of the pile foundation 10 can be more accurately captured.

[0104] When creating a database of the data D measured by the measuring device 20, the data D may be stored in a storage medium (HDD, SSD, etc.) or may be uploaded to the cloud and managed on the cloud. The method of retrieving the data D measured by the measuring device 20 is not particularly limited, and may be performed by either wired or wireless means, or via one or more recording media, or a combination of these. The recording medium may be a recording medium built into or external to the measuring device in which the data D is directly stored, or a recording medium from which the data D is retrieved by a wireless or wired receiving device using a USB memory, SD card, or the like. In addition, by making a backup of the data D, the risk of data deletion or loss can be avoided. The method of supplying power to the measuring device 20 and the storage medium may be a wired power supply or a wireless power supply. In addition, power supply using a rechargeable battery or a self-generated power source such as solar or vibration power generation may be used, and may be selected according to the situation. In addition, a combination of the above-mentioned wired power supply, wireless power supply, rechargeable battery, and self-generated power may be appropriately adopted, such as a combination of self-generated power generation and a rechargeable battery, or a combination of wired / wireless power supply and a rechargeable battery.

[0105] <Digital model update process> Next, step S3 is a process of updating the digital model M1 based on the data D to bring it closer to the actual state of the pile foundation 10. In this process, the ground spring and pile head fixity, etc. in the digital model M1 are corrected to match the actual situation, so that the digital model M1 approaches the actual state of the pile foundation 10 (hereinafter, sometimes simply referred to as the actual state). Here, the actual state indicates the damage distribution (planar position, depth position), stress distribution (bending moment, shear force, axial force), strain distribution, stiffness distribution, remaining strength, deterioration degree, cumulative damage, etc. of the pile 11. In step S3, a process of correcting model conditions such as the pile head fixity and ground spring in the digital model M1 is performed with reference to the strain distribution, stress distribution (bending moment, shear force, axial force), and stiffness distribution measured in the actual pile foundation 10. The correction process in step S3 is performed at least once.

[0106] FIG. 6 shows an example of bending strain that occurs in the pile 11 when subjected to a small to medium earthquake (seismic intensity 5+ or less), where (a) shows the correspondence between the initial digital model M1 and the actual object, and (b) shows the correspondence between the digital model M1 and the actual object after updating based on one year of measurement data. In FIGS. 6(a) and (b), plot p is the actual measurement value measured by the strain measuring device 21 installed on the actual object, and line q is the bending strain calculated by the digital model M1. The "initial digital model M1" in FIG. 6(a) is in a state before the update in step S3.

[0107] According to an example in Figures 6(a) and (b), in the initial state (unupdated state) shown in Figure 6(a), the bending strain distribution of the pile 11 deviates between the calculated value q of the digital model M1 and the actual measured value p of the actual object, but after the update shown in Figure 6(b), there is a good correspondence between the calculated value q of the digital model M1 and the actual measured value p of the actual object.

[0108] It is preferable that step S3 of updating the digital model M1 is performed periodically or in response to changes in the condition of the actual pile foundation 10. Specifically, it is preferable that the digital model M1 is updated after a certain period of time has elapsed since the construction of the actual pile foundation 10, and further, after the first earthquake in which the pile foundation 10 is damaged.

[0109] <Simulation process> Next, the process of performing a simulation using the digital model M1 in step S4 (step S4) will be described. By performing step S4, at least one evaluation result is obtained from a first evaluation that grasps the actual state of the pile foundation 10 at present, a second evaluation that predicts the actual state of the pile foundation 10 after experiencing an event that may occur from now on, and a third evaluation that grasps the actual state of the pile foundation 10 in the past.

[0110] The simulations employed in step S4 are general analyses for grasping the state of the actual pile foundation 10, such as analyses taking into account external forces of disasters (earthquakes, gusts of wind (tornadoes, etc.), tsunamis, etc.), analyses taking into account changes in loading conditions such as rebuilding or expansion of the superstructure 13, analyses reflecting additional piles and reinforcement, analyses taking into account excavation of the surrounding ground, installation of retaining walls, changes in groundwater levels, etc. For example, when simulating the occurrence of an earthquake, seismic waves may be automatically input to the digital model from a publicly available strong earthquake observation network, etc. Also, a simulation may be performed based on observed values ​​of initial tremors (P waves) or other observation records after the occurrence of an earthquake. It is preferable to select an appropriate simulation method according to the purpose from among elastic analysis, elastoplastic analysis, rigid-plastic analysis, etc., and either dynamic analysis or static analysis may be used.

[0111] The first evaluation is to grasp the current actual state of the pile foundation 10 by a simulation using the digital model M1. The third evaluation is to grasp the past actual state of the pile foundation 10 by a simulation using the digital model.

[0112] The above-mentioned second evaluation involves grasping the actual state of the pile foundation 10 after experiencing events that may occur from now onwards through a simulation using a digital model. In the above-mentioned second evaluation, events that may occur from now onwards include events that may affect the pile foundation 10, such as disasters (e.g. earthquakes, wind gusts (tornadoes, etc.), tsunamis, etc.), rebuilding or extension of the superstructure 13, additional piles or reinforcement, excavation of the surrounding ground and installation of retaining walls, changes in the groundwater level, etc.

[0113] In step S4, the constructed digital model M1 is used to perform a simulation of a major earthquake predicted in the future, for example as shown in FIG. 7, thereby making it possible to grasp the damage state when the actual pile foundation 10 is hit by an earthquake. The simulation result shown in FIG. 7 is an example in which the bending strain generated at the pile head of the rightmost pile 11 exceeds the yield strain. In other words, it can be understood that the pile head of the rightmost pile 11 will become plastic when hit by a major earthquake predicted in the future. The "x" mark in FIG. 7 indicates that the bending strain at the pile head of the rightmost pile 11 exceeds the yield strain.

[0114] By carrying out the evaluation method according to the above-mentioned flow from step S1 to step S4, the flow of the application example shown in FIG. 8 can be implemented. As shown in FIG. 8, when a disaster such as an earthquake or tsunami occurs (step S11), external force information of the disaster is input to a digital model M1 of the pile foundation 10, which is an underground structure, in step S12. Then, in step S13, a simulation is carried out, and the damage condition of the pile foundation 10 due to the disaster can be grasped based on the simulation result. Further, the simulation result is displayed or output (step S14). This can be used to judge the continued usability of the pile foundation 10, repair, and judge the necessity of repair. The displayed or output simulation result data is notified to a user (the owner or manager of the pile foundation 10, etc.).

[0115] The information communicated to the user can be automatically distributed to local residents via email, SMS (short message service), other apps, etc., for example, to streamline evacuation and recovery during disasters.In addition, the information communicated to the user can be automatically distributed to a materials center for repairing pile foundations 10, for example, so that the necessary materials can be arranged immediately.

[0116] As another example of use, it can be used to reuse part or all of the underground structure (pile foundation 10) when rebuilding another superstructure.

[0117] More specifically, based on the results of the simulation, at least one of the following processes can be performed: determining the continued usability of the pile foundation 10; issuing evacuation orders; calculating materials required for repairs and reinforcement; and arranging for materials required for repairs and reinforcement.

[0118] The method for evaluating the pile foundation 10 according to the above flow (steps S1 to S4) may be performed manually, or may be mechanically automated using an automatic program or the like, or may be a combination of manual and automated methods.

[0119] That is, in order to realize the evaluation method for the pile foundation 10 of this embodiment, a calculation program for executing each of steps S1 to S4 is supplied to a computer, and the pile foundation 10 can be evaluated by having the CPU or MPU operate in accordance with the calculation program stored in a storage device such as a main storage device of the computer.

[0120] The above-mentioned evaluation system having the calculation program includes a terminal device. The terminal device is communicably connected via a network. The network may be a network using wireless communication or a network using wired communication. The network may be configured using, for example, the Internet or a local area network (LAN). The network may be configured by combining a plurality of networks. The terminal device is configured using information devices such as a smartphone, a tablet, a personal computer, a dedicated device, etc. The communication medium includes a communication unit, an input unit, an output unit, a storage unit, and a control unit.

[0121] The control unit is configured using a processor such as a CPU (Central Processing Unit) and a memory (main storage device). The control unit functions by the processor executing a program. All or part of the functions of the control unit may be realized using hardware such as an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), or an FPGA (Field Programmable Gate Array). The above program may be recorded on a computer-readable recording medium. Examples of computer-readable recording media include portable media such as flexible disks, optical magnetic disks, ROMs, CD-ROMs, and semiconductor storage devices (e.g., SSDs: Solid State Drives), and storage devices such as hard disks and semiconductor storage devices built into computer systems. The above program may be transmitted via an electric communication line.

[0122] The control unit may execute, for example, an application installed in the device itself (terminal device). A specific example of such an application is an application provided to the terminal device as a dedicated application for the evaluation system. Another specific example of such an application is a web browser application. Such an application may be installed in the terminal device in advance, or may be downloaded each time the determination process is executed. For example, when implemented as a web browser application, the terminal device may download and execute the application from a device (which may be the web server itself or another server, for example) designated by the web server in response to the terminal device connecting to the specific web server. The control unit operates according to the program of the application being executed.

[0123] For example, the hardware configuration of an information processing device such as a personal computer or a server device includes a processor, a main storage device, a communication interface, an auxiliary storage device, an input / output interface, and an internal bus. The processor, the main storage device, the communication interface, the auxiliary storage device, and the input / output interface are connected to each other via the internal bus so as to be able to communicate with each other.

[0124] Next, a calculation program for executing the evaluation method of the pile foundation 10 by a computer will be specifically described. The calculation program executes the steps of creating a digital model M1 of the pile foundation 10, installing a measuring device including a strain measuring device 20 or a stress measuring device at at least one of the body of the pile foundation 10 and the dummy member 11A of the pile foundation 10, inputting data D measured by the measuring device 20 for a certain period of time, updating the digital model M1 based on the data D to bring it closer to the actual state of the pile foundation 10, and performing a simulation using the digital model M1. In this calculation program, in the step of performing the simulation, at least one evaluation result can be obtained from a first evaluation for grasping the actual state of the current pile foundation 10, a second evaluation for predicting the actual state of the pile foundation 10 after experiencing an event that may occur from the present onwards, and a third evaluation for grasping the actual state of the pile foundation 10 in the past.

[0125] Furthermore, an example of an evaluation system for underground structures that evaluates the state of the pile foundation 10 includes a first processing unit that performs the above-mentioned step S1, a second processing unit that performs step S2, a third processing unit that performs step S3, and a fourth processing unit that performs step S4, and is configured to perform a simulation in the fourth processing unit to obtain at least one evaluation result from among a first evaluation that grasps the actual state of the pile foundation 10 at present, a second evaluation that predicts the actual state of the pile foundation 10 after experiencing an event that may occur from the present onwards, and a third evaluation that grasps the actual state of the pile foundation 10 in the past.

[0126] Next, the above-mentioned evaluation method for the underground structure (pile foundation 10), the evaluation system for the underground structure (pile foundation 10), the calculation program, and the function of the underground structure will be described in detail with reference to the drawings. According to the underground structure evaluation method of this embodiment, the actual condition can be grasped by simulating on the digital model M1, so that the condition of the pile foundation 10 that constitutes the underground structure can be grasped without carrying out large-scale construction work on site. Furthermore, in this embodiment, since the digital model M1 corresponds to the actual object based on the measurement data D of the actual object, the digital model M1 accurately represents the actual object, and the state of the actual object can be grasped with high accuracy on the digital model M1.

[0127] In addition, in this embodiment, the strain of the actual pile foundation 10 is measured and corresponds to the digital model M1, so that it is possible to grasp detailed conditions such as the damage distribution (planar position, depth position), stress distribution (bending moment, shear force, axial force), strain distribution, and stiffness distribution of the pile foundation 10. This makes it possible to know in detail the remaining strength of the pile foundation 10 considering damage caused by earthquakes, gusts of wind, etc., the impact on the pile foundation 10 of load changes caused by rebuilding or reinforcing the superstructure 13, and the deterioration state of the pile foundation 10 due to aging, which can be used to make specific decisions such as continued use, repair, reinforcement, and demolition of the pile foundation 10.

[0128] Furthermore, in this embodiment, by initially creating the digital model M1 without using the measurement data D of the actual pile foundation 10, construction of the evaluation system for the pile foundation 10 can be started regardless of the construction status and measurement status of the actual pile foundation 10, and this allows for flexibility in dispersing the workload of system construction. A design model for constructing the pile foundation 10 can also be used as the digital model M1 in this embodiment, reducing the workload of constructing the evaluation system.

[0129] In addition, in this embodiment, it is difficult to grasp the state of the underground structure of the pile foundation 10 supporting the superstructure 13 because the superstructure 13 is installed above it, but according to the present invention, the actual state can be grasped by simulating the digital model M1, and the state of the pile foundation 10 can be grasped without carrying out large-scale construction work on-site. Therefore, when checking the state of the pile foundation 10, it is not necessary to take the great effort of dismantling the superstructure as in the past.

[0130] In addition, in this embodiment, since the pile foundation 10 has a superstructure 13 installed above and is long downward, it is difficult to grasp the state of the underground structure, but according to the present invention, the actual state can be grasped by simulation on the digital model M1, and the state of the pile foundation 10 can be grasped without carrying out large-scale construction work on site. Therefore, when checking the state of the pile foundation 10, it is not necessary to go through the great effort required for dismantling the superstructure, excavating deep to expose the piles, etc., as in the conventional method.

[0131] In this embodiment, the digital model M1 is also updated after a certain period of time has passed since the construction of the actual pile foundation 10. The degree of correspondence between the digital model M1 of the pile foundation 10 and the actual thing may change due to changes over time in the actual pile foundation 10 and the ground G even if there is no clear change in state, such as damage caused by a major earthquake or rebuilding of the superstructure 13. Therefore, by updating the digital model M1 of the pile foundation 10 and the actual thing, in addition to the initial deviation immediately after the construction of the actual pile foundation 10, and by taking into account the deviation that accompanies the subsequent change over time in the actual thing, it becomes possible to grasp the state of the actual thing more accurately on the digital model M1.

[0132] Moreover, in this embodiment, the digital model M1 is updated after the first earthquake in which the pile foundation 10 is damaged. By using this method, the digital model M1 is updated based on the measurement data D at the time of the disaster after the first earthquake in which the pile foundation 10 is damaged, so that the digital model M1 can be constructed in a form closer to the actual state of the pile foundation 10.

[0133] In addition, in this embodiment, after grasping the actual state of the pile foundation 10, only the digital model M1 is re-updated based on the result of the simulation, and a further simulation is performed using the re-updated digital model M1 to obtain an evaluation result and grasp the actual state of the pile foundation 10. Therefore, even if the measuring device attached to the actual pile foundation 10 reaches the end of its life or breaks down and it is not possible to update the digital model M1 based on the measurement data, it is possible to update the digital model M1 based only on the simulation result and grasp the actual state of the pile foundation 10. For example, when a simulation is performed using the digital model M1 and the pile foundation 10 is damaged on the digital model M1, the digital model M1 can be updated to reflect the damage.

[0134] In this embodiment, the measurement data D is compiled into a database, which makes it possible to track the damage history and changes over time of the pile foundation 10. Furthermore, by analyzing the database, it is possible to clarify the damage mechanism of the pile foundation 10 and predict deterioration. Furthermore, by using the database, it is also possible to predict damage and evaluate the remaining strength of similar pile foundations 10 other than the pile foundation 10 being measured.

[0135] In addition, in this embodiment, repair and reinforcement specifications for the pile foundation 10 can be designed based on the results of evaluating the actual condition of the pile foundation 10 by simulating the digital model M1, thereby making it possible to easily and appropriately select specifications to enhance the safety of the pile foundation 10.

[0136] In addition, in this embodiment, by using the evaluation results to reuse part or all of the pile foundations 10 when rebuilding the superstructure 13, the condition of the pile foundations 10 can be easily and accurately grasped, which can be useful for designing the reuse of existing piles. Therefore, it is possible to meet the increasing need for reuse of existing piles as the construction stock increases.

[0137] In addition, in this embodiment, when a disaster such as an earthquake or tsunami occurs, external force information of the disaster is input into the digital model M1, and by performing a simulation, the damage situation of the pile foundation 10 caused by the disaster can be grasped. By communicating the simulation results to the user (the owner or manager of the pile foundation 10, etc.), the results can be used to determine the continued usability of the pile foundation 10, repairs, and the need for repairs. This series of steps may be performed manually by a human being, but it is more convenient if it is mechanically automated by an automatic program or the like.

[0138] In addition, in this embodiment, by taking at least one of the following measures based on the simulation results, including determining the continued usability of the pile foundation 10, issuing evacuation orders, calculating materials required for repairs and reinforcement, and arranging for materials required for repairs and reinforcement, it is possible to more reliably, quickly, and with less workload to restore the pile foundation 10 after a disaster and to protect human lives.

[0139] The underground structure evaluation method, underground structure evaluation system, calculation program, and underground structure according to the present embodiment described above make it possible to grasp detailed conditions without requiring large-scale construction work.

[0140] Second embodiment As shown in Figures 9 and 10, the method for evaluating an underground structure according to the second embodiment involves installing a measuring device 20 for measuring the detailed condition of the pile foundation 10 (underground structure) and measuring data D over a certain period of time, creating a digital model M1 of the pile foundation 10 shown in Figure 2 based on the data D, and performing a simulation on the digital model M1 to evaluate the pile foundation 10 to grasp its actual condition. Here, in step 3 of the first embodiment shown in Fig. 4 described above, the digital model M1 shown in Fig. 2 is created without reflecting the data D obtained by measuring the data of the real object, and the digital model M1 is updated based on the data D, and the data measurement is simply preceded. On the other hand, in the second embodiment, the digital model M1 shown in Fig. 2 is created using the data D obtained by measuring the data of the real object. In the second embodiment, the structures to be evaluated (pile foundation 10, superstructure 13, dummy member 11A) have the same configuration as in the first embodiment, and therefore a detailed description thereof will be omitted here.

[0141] The method for evaluating the pile foundation 10 includes a step of installing a measuring device 20 including a strain measuring device 21 or a stress measuring device at at least one or more locations of the body of the pile foundation 10 or the dummy member 11A, measuring data D for a certain period of time with the measuring device 20 (step S21), a step of creating a digital model M1 reflecting the actual state of the pile foundation 10 based on the data D (step S22), a step of updating the digital model M1 based on the data D to bring it closer to the actual state of the pile foundation 10 (step S23), and a step of performing a simulation using the digital model M1 (step S24). The fourth flowchart shown in FIG. 9 is a flow in which step S23 is omitted. The fifth flowchart shown in FIG. 10 is a flow including step S23.

[0142] Then, similarly to the first embodiment described above, by performing step S24, at least one evaluation result is obtained from among a first evaluation that grasps the actual state of the pile foundation 10 at present, a second evaluation that predicts the actual state of the pile foundation 10 after experiencing an event that may occur from the present onwards, and a third evaluation that grasps the actual state of the pile foundation 10 in the past.

[0143] Specifically, a calculation program for executing the evaluation method for the pile foundation 10 on a computer executes the following steps: a measuring device 20 including a strain measuring device or a stress measuring device is installed in at least one of the body of the pile foundation 10 and the dummy member 11A of the pile foundation 10, and data D measured for a certain period of time by the measuring device 20 is input; a digital model M1 reflecting the actual state of the pile foundation 10 based on the data D is created; and a simulation is performed using the digital model M1. In this calculation program, a step of updating the digital model M1 based on the data D to bring it closer to the actual state of the pile foundation 10 is selectively provided, and in the simulation step, at least one evaluation result can be obtained from a first evaluation for grasping the actual state of the pile foundation 10 at present, a second evaluation for predicting the actual state of the pile foundation 10 after experiencing an event that may occur from the present onward, and a third evaluation for grasping the actual state of the pile foundation 10 in the past.

[0144] In addition, an example of an evaluation system for an underground structure that evaluates the state of the pile foundation 10 in the second embodiment has a fifth processing unit that performs the above-mentioned step S21, a sixth processing unit that performs step S22, and a seventh processing unit that performs step S23, with an eighth processing unit that performs step S24 selectable, and is configured to perform a simulation in the seventh processing unit to obtain at least one evaluation result from among a first evaluation that grasps the actual state of the pile foundation 10 at present, a second evaluation that predicts the actual state of the pile foundation 10 after experiencing an event that may occur from the present onwards, and a third evaluation that grasps the actual state of the pile foundation 10 in the past.

[0145] In the second embodiment, since the actual state can be grasped by simulating the digital model M1, the state of the pile foundation 10 can be grasped without carrying out large-scale construction work on-site. Furthermore, in this embodiment, since the digital model M1 corresponds to the actual object based on measurement data of the actual object, the digital model M1 accurately represents the actual object, and the state of the actual object can be grasped with high accuracy on the digital model M1. In addition, in this embodiment, the strain of the actual pile foundation 10 is measured and corresponds to the digital model M1, so that it is possible to grasp detailed conditions such as the damage distribution (planar position, depth position), stress distribution (bending moment, shear force, axial force), strain distribution, and stiffness distribution of the pile foundation 10. This makes it possible to know in detail the remaining strength of the pile foundation 10 considering damage caused by earthquakes, gusts of wind, etc., the impact on the pile foundation 10 of load changes caused by rebuilding or reinforcing the superstructure, and the deterioration state of the pile foundation 10 due to aging, which can be used to make specific decisions such as continued use, repair, reinforcement, and demolition of the pile foundation 10. Furthermore, in this embodiment, by initially creating the digital model M1 based on the measurement data D of the actual pile foundation 10, the initial digital model M1 can be created to reflect the actual state, thereby reducing the workload associated with constructing the evaluation system. In this case, since the initial digital model M1 reflects the actual state, a process of updating the digital model M1 to make it closer to the actual state may or may not be included.

[0146] Third embodiment Next, a third embodiment will be described. For example, in the process of measuring an actual underground structure (pile foundation 10), the above embodiment describes a method in which the underground structure itself or a dummy member 11A is measured as the measurement target, but this is not limited to this, and it is also possible, for example, to evaluate the condition of structures other than the underground structure that is the measurement target.

[0147] The evaluation method of the third embodiment creates another digital model (not shown) of a structure other than the underground structure to be measured based on the digital model, and obtains at least one evaluation result from the fourth evaluation, which grasps the current actual state of the structure other than the underground structure to be measured, the fifth evaluation, which predicts the actual state of the structure other than the underground structure to be measured after experiencing an event that may occur from now on, and the sixth evaluation, which grasps the actual state of the structure other than the underground structure to be measured in the past, using the other digital model. The events that may occur from now on are the same as those listed in the second embodiment.

[0148] In this case, by creating a digital model of another underground structure based on the digital model of the underground structure to be measured, it is possible to grasp the current actual state of the structure other than the underground structure to be measured, or to predict the actual state of the structure other than the underground structure after experiencing an event that may occur from now on, or to grasp the actual state of the structure other than the underground structure in the past. The more similar the underground structure to be measured and the structure other than the underground structure to be measured are, the higher the accuracy of the simulation by the digital model is, which is preferable. By utilizing such a method, it is possible to grasp the state of underground structures over a wide area.

[0149] (Fourth embodiment) Next, a fourth embodiment will be described with reference to Fig. 11 to Fig. 14. Fig. 11 to Fig. 14 show an example of a fitting method used in the method for evaluating an underground structure. The method for evaluating an underground structure according to the fourth embodiment creates a digital model reflecting the actual corrosion state of a pile foundation 10A (underground structure) including steel materials (see FIG. 14), and evaluates the state of the underground structure using the digital model. Here, the pile foundation 10A may be, for example, a steel pipe pile, a CFT pile, a SC pile, or a cast-in-place concrete pile wrapped in a steel pipe. In the fourth embodiment, at least one of the three fitting methods (first fitting method, second fitting method, and third fitting method) described below is used, and the state of the underground structure, such as the damage distribution (planar position, depth position), stress distribution (bending moment, shear force, axial force), strain distribution, and stiffness distribution, of the underground structure can be evaluated through simulation.

[0150] The first fitting method involves installing a corrosion measuring device to measure the detailed corrosion condition of the pile foundation 10A and measuring data over a certain period of time, and then matching a digital model of the pile foundation 10A with the actual object based on that data, and performing a simulation on the digital model to grasp the actual condition and evaluate the pile foundation 10A.

[0151] Fig. 11 shows a diagram illustrating the relationship between the amount of corrosion thinning and elapsed time using the first fitting method. Fig. 11 is a graph with the horizontal axis representing elapsed time (years) and the vertical axis representing the amount of corrosion thinning (mm). In Fig. 11, plot p1 (white circle) represents the actual measured value measured by the corrosion measuring device, and the dashed line represents the correlation equation Q1 obtained by fitting.

[0152] Here, corrosion measurement methods that can be used include direct determination based on the reduction in weight or plate thickness through exposure tests, and methods that use corrosion measurement equipment (electrochemical impedance method, AC impedance method, polarization resistance method, potential difference measurement method, X-ray diffraction method (XRD), etc.). Corrosion measuring devices include electrical resistance corrosion sensors (RCM sensors) and ACM (Atmospheric Corrosion Monitor) sensors.

[0153] As shown in Fig. 11, in the first fitting method, the relationship between the amount of corrosion thinning (mm) and the elapsed time (years) is grasped by measuring the corrosion of the steel material for a certain period of time in the actual body or dummy members of the pile foundation 10A using a corrosion measuring device (plot p1 in Fig. 11). Then, the relationship between the amount of corrosion thinning (mm) and the elapsed time (years) is fitted with an exponential function or the like to obtain a correlation equation Q1, so that the amount of corrosion thinning at each elapsed time can be estimated and the corrosion state of the pile foundation 10A can be reflected in the digital model.

[0154] The second fitting method evaluates the pile foundation 10A by grasping the corrosion state of the actual pile foundation 10A after experiencing environmental changes (when a change in the corrosion rate occurs, such as an increase in the corrosion rate) during a corrosion measurement period similar to the first fitting method described above.

[0155] Fig. 12 shows a relationship between the corrosion metal loss amount and the elapsed time by the second fitting method when the corrosion rate changes due to the environmental change during the corrosion measurement period. Fig. 12 is a graph with the elapsed time (years) on the horizontal axis and the corrosion metal loss amount (mm) on the vertical axis. In Fig. 12, plot p1 (white circle) shows the actual measurement value measured by the corrosion measurement device before the corrosion rate change, plot p2 (black circle) shows the actual measurement value measured by the corrosion measurement device after the corrosion rate change, the dashed line shows the correlation equation Q1 obtained by fitting before the corrosion rate change, and the solid line shows the correlation equation Q2 obtained by fitting after the corrosion rate change.

[0156] As shown in Fig. 12, in the second fitting method, when the actual body or dummy member of the pile foundation 10A is affected by a tsunami, high tide, or soil contamination during the corrosion measurement period and the corrosion rate changes, such as the corrosion rate increasing, the relationship between the corrosion thinning amount (mm) reflecting the change in corrosion rate and the elapsed time (years) is grasped based on the measurement data (plot p2 in Fig. 12). Then, by fitting this relationship with an exponential function or the like to obtain correlation equation Q2, the corrosion thinning amount at each elapsed time can be estimated and the corrosion state of the pile foundation 10A can be reflected in the digital model.

[0157] The third fitting method involves evaluating the corrosion state of the actual pile foundation 10A by grasping the corrosion state of the actual pile foundation 10A after experiencing environmental changes outside of the corrosion measurement period (when a change in the corrosion rate occurs, such as an increase in the corrosion rate).

[0158] Fig. 13 shows the relationship between the amount of corrosion thinning and elapsed time using the third fitting method when there is a change in the corrosion rate due to an environmental change or the like outside the corrosion measurement period. Fig. 13 is a graph with the elapsed time (years) on the horizontal axis and the amount of corrosion thinning (mm) on the vertical axis. In Fig. 13, plot p1 (white circle) shows the actual value measured by the corrosion measuring device before the corrosion rate change, the dashed line shows the correlation equation Q1 obtained by fitting before the corrosion rate change, and the solid line shows the correlation equation Q3 estimated using a database or the like after the corrosion rate change.

[0159] As shown in Fig. 13, in the third fitting method, when the actual body or dummy member of the pile foundation 10A is affected by a tsunami, high tide, soil contamination, or the like outside the corrosion measurement period, and the corrosion rate changes, such as an increase in the corrosion rate, the corrosion environment is estimated by soil sampling, in-situ measurement, or other predictions.Then, by utilizing a corrosion database of the same or similar past steel materials to estimate the corrosion rate in that corrosive environment, the relationship between the amount of corrosion thinning (mm) that reflects the change in corrosion rate and the elapsed time (years) is estimated to obtain correlation equation Q3, and the amount of corrosion thinning at each elapsed time can be estimated, and the corrosion state of the pile foundation 10A can be reflected in the digital model.

[0160] FIG. 14 shows the amount of corrosion thinning (mm) estimated at each position in the pile foundation 10A after 40 years of construction, for example. As shown in FIG. 14, the amount of corrosion thinning estimated by the first fitting method, the second fitting method, or the third fitting method is reflected in the digital model. At that time, it is desirable to reflect the amount of corrosion thinning estimated by measuring the corrosion at all positions of the actual body or dummy member of the pile foundation 10A in the digital model, but it is not necessarily necessary to measure the corrosion at all positions. The amount of corrosion thinning at each position may be estimated using corrosion measurement data at limited positions and reflected in the digital model. For example, since the soil near the ground surface, near the groundwater level boundary, and acidic soil are prone to corrosion, the general tendency for the amount of corrosion thinning to be large (for example, in the pile foundation 10A on the right side of the page, the amount of corrosion thinning near the ground surface is 0.23 mm, while the amount near the bottom end is 0.01 mm) can be reflected in the digital model.

[0161] The above describes embodiments of the underground structure evaluation method, underground structure evaluation system, calculation program, and underground structure according to the present invention. However, the present invention is not limited to the above-described embodiments, and it is possible to appropriately replace the components in the above-described embodiments with well-known components without departing from the spirit of the present invention. [Explanation of symbols]

[0162] 10, 10A pile foundation (underground structure) 11 stake 11A Dummy member 12 Foundation board 13 Superstructure 20. Measurement Equipment D Data M1 Digital Model

Claims

1. A method for evaluating the condition of an underground structure, comprising: creating a digital model of the underground structure; a step of measuring data for a certain period of time using a measuring device including a strain measuring device or a stress measuring device provided in at least one of the main body of the underground structure and a dummy member of the underground structure; updating the digital model based on the data to approximate a real state of the underground structure; and performing a simulation using the digital model, An underground structure evaluation method in which, by performing the simulation, at least one evaluation result is obtained from among a first evaluation that grasps the current actual state of the underground structure, a second evaluation that predicts the actual state of the underground structure after experiencing events that may occur from the present onwards, and a third evaluation that grasps the actual state of the underground structure in the past.

2. The method for evaluating an underground structure according to claim 1 , wherein the underground structure supports an upper structure.

3. The method for evaluating an underground structure according to claim 2 , wherein the underground structure is a pile foundation.

4. the underground structure includes a steel material; The method for evaluating an underground structure according to claim 1 , wherein the measurement device includes a corrosion measurement device.

5. A method for evaluating the condition of an underground structure, comprising: a step of measuring data for a certain period of time using a measuring device including a strain measuring device or a stress measuring device provided in at least one of the main body of the underground structure and a dummy member of the underground structure; creating a digital model reflecting the actual state of the underground structure based on the data; and performing a simulation using the digital model, A step of updating the digital model based on the data to approximate the actual state of the underground structure is optional; An underground structure evaluation method in which, by performing the simulation, at least one evaluation result is obtained from among a first evaluation that grasps the current actual state of the underground structure, a second evaluation that predicts the actual state of the underground structure after experiencing events that may occur from the present onwards, and a third evaluation that grasps the actual state of the underground structure in the past.

6. The method for evaluating an underground structure according to claim 5 , wherein the underground structure supports an upper structure.

7. The method for evaluating an underground structure according to claim 6, wherein the underground structure is a pile foundation.

8. the underground structure includes a steel material; The method for evaluating an underground structure according to claim 5 , wherein the measurement device includes a corrosion measurement device.

9. The method for evaluating an underground structure according to claim 1 , wherein the digital model is updated also after a certain period of time has elapsed after the construction of the actual underground structure.

10. The method for evaluating an underground structure according to claim 1 , wherein the digital model is updated after a first earthquake in which the underground structure is damaged.

11. A method for evaluating an underground structure described in any one of claims 1 to 8, wherein after grasping or predicting the actual state of the underground structure, only the digital model is re-updated based on the results of the simulation, and a further simulation is performed using the re-updated digital model to obtain the evaluation results and grasp the actual state of the underground structure.

12. The method for evaluating an underground structure according to claim 1 , further comprising the step of: compiling the data measured by the measuring device into a database.

13. The method for evaluating an underground structure according to claim 1 , further comprising the step of designing repair and reinforcement specifications according to the evaluation results indicating the actual condition of the underground structure.

14. 8. A method for evaluating an underground structure according to claim 2, 3, 6 or 7, wherein the evaluation results are used to reuse a part or all of the underground structure when rebuilding the superstructure.

15. In the event of a disaster, including an earthquake or tsunami, inputting external force information due to the disaster into the digital model; simulating the disaster using the digital model; The method for evaluating an underground structure according to claim 1 , further comprising a step of displaying or outputting the results of the disaster simulation.

16. The method for evaluating an underground structure described in claim 15, further comprising: a means for determining the continued usability of the underground structure based on the results of the simulation; a means for issuing an evacuation order; a means for calculating materials required for repairs or reinforcement; and a means for arranging materials required for repairs or reinforcement.

17. creating a separate digital model of a structure other than the underground structure based on the digital model; Using the other digital model, A method for evaluating an underground structure as described in any one of claims 1 to 8, which obtains at least one evaluation result from a fourth evaluation that grasps the current actual state of a structure other than the underground structure, a fifth evaluation that predicts the actual state of the structure other than the underground structure after experiencing an event that may occur from the present onwards, and a sixth evaluation that grasps the actual state of the structure other than the underground structure in the past.

18. A method for evaluating an underground structure as described in claim 17, wherein, after grasping or predicting the actual state of a structure other than the underground structure, only the other digital model is re-updated based on the results of the simulation, and a further simulation is performed using the re-updated other digital model to obtain the evaluation result and grasp the actual state of the structure other than the underground structure.

19. In the event of a disaster, including an earthquake or tsunami, inputting external force information due to the disaster into at least one of the digital model and the other digital model; simulating the disaster using the digital model; The method for evaluating an underground structure according to claim 17, further comprising a step of displaying or outputting the results of the disaster simulation.

20. The method for evaluating underground structures described in claim 19, further comprising at least one of the following means: a means for determining the continued usability of the underground structure, a means for issuing evacuation orders, a means for calculating materials required for repairs or reinforcement, and a means for arranging materials required for repairs or reinforcement, based on the results of the simulation.

21. An underground structure evaluation system for evaluating the condition of an underground structure, comprising: A first processing unit that creates a digital model of the underground structure; a second processing unit that is provided with a measuring device including a strain measuring device or a stress measuring device at at least one of the main body of the underground structure and the dummy member of the underground structure, and that measures data for a certain period of time using the measuring device; A third processing unit that updates the digital model based on the data to approximate the actual state of the underground structure; a fourth processing unit that performs a simulation using the digital model, An underground structure evaluation system that performs the simulation in the fourth processing unit to obtain at least one evaluation result from among a first evaluation that grasps the current actual state of the underground structure, a second evaluation that predicts the actual state of the underground structure after experiencing events that may occur from the present onwards, and a third evaluation that grasps the actual state of the underground structure in the past.

22. the underground structure includes a steel material; The underground structure evaluation system of claim 21 , wherein the measurement device includes a corrosion measurement device.

23. An underground structure evaluation system for evaluating the condition of an underground structure, comprising: A fifth processing unit, in which a measuring device including a strain measuring device or a stress measuring device is installed in at least one of the main body of the underground structure and the dummy member of the underground structure, and which measures data for a certain period of time using the measuring device; A sixth processing unit that creates a digital model reflecting the actual state of the underground structure based on the data; a seventh processing unit that performs a simulation using the digital model, An eighth processing unit is selectively provided to update the digital model based on the data to approximate the actual state of the underground structure; An underground structure evaluation system that performs the simulation in the seventh processing unit to obtain at least one evaluation result from among a first evaluation that grasps the current actual state of the underground structure, a second evaluation that predicts the actual state of the underground structure after experiencing events that may occur from the present onwards, and a third evaluation that grasps the actual state of the underground structure in the past.

24. the underground structure includes a steel material; The underground structure evaluation system of claim 23 , wherein the measurement device includes a corrosion measurement device.

25. A calculation program for executing the underground structure evaluation method according to any one of claims 1 to 4 on a computer, creating a digital model of the underground structure; A step of installing a measuring device including a strain measuring device or a stress measuring device in at least one of the main body of the underground structure and the dummy member of the underground structure, and inputting data measured by the measuring device for a certain period of time; updating the digital model based on the data to approximate a real state of the underground structure; performing a simulation using the digital model; In the step of performing the simulation, a calculation program obtains at least one evaluation result from a first evaluation that grasps the current actual state of the underground structure, a second evaluation that predicts the actual state of the underground structure after experiencing events that may occur from the present onwards, and a third evaluation that grasps the actual state of the underground structure in the past.

26. In the event of a disaster, including an earthquake or tsunami, inputting external force information due to the disaster into the digital model; simulating the disaster using the digital model; The computing program according to claim 25, further comprising a step of: displaying or outputting a result of the disaster simulation.

27. The computational program described in claim 26, which executes at least one of the following steps based on the results of the simulation: determining the continued usability of the underground structure and outputting the result; outputting an evacuation instruction; calculating and outputting materials required for repairs and reinforcement; and outputting the materials required for repairs and reinforcement.

28. A calculation program for executing the underground structure evaluation method according to any one of claims 5 to 8 on a computer, A step of installing a measuring device including a strain measuring device or a stress measuring device in at least one of the main body of the underground structure and the dummy member of the underground structure, and inputting data measured by the measuring device for a certain period of time; creating a digital model reflecting the actual state of the underground structure based on the data; performing a simulation using the digital model; a step of updating the digital model based on the data to approximate a real state of the underground structure is selectively provided; In the step of performing the simulation, a calculation program obtains at least one evaluation result from a first evaluation that grasps the current actual state of the underground structure, a second evaluation that predicts the actual state of the underground structure after experiencing events that may occur from the present onwards, and a third evaluation that grasps the actual state of the underground structure in the past.

29. In the event of a disaster, including an earthquake or tsunami, inputting external force information due to the disaster into the digital model; simulating the disaster using the digital model; The computing program according to claim 28, further comprising a step of: displaying or outputting a result of the disaster simulation.

30. The computational program described in claim 29 executes at least one of the following steps based on the results of the simulation: determining the continued usability of the underground structure and outputting the result; outputting an evacuation instruction; calculating and outputting materials required for repairs and reinforcement; and outputting the result so that materials required for repairs and reinforcement can be arranged.

31. A calculation program for executing the underground structure evaluation method according to any one of claims 1 to 8 on a computer, creating a separate digital model of a structure other than the underground structure based on the digital model; A computational program that executes the steps of obtaining and outputting at least one evaluation result from a fourth evaluation using the other digital model to grasp the current actual state of a structure other than the underground structure, a fifth evaluation predicting the actual state of the structure other than the underground structure after experiencing an event that may occur from the present onwards, and a sixth evaluation to grasp the actual state of the structure other than the underground structure in the past.

32. In the event of a disaster, including an earthquake or tsunami, inputting external force information due to the disaster into at least one of the digital model and the other digital model; simulating the disaster using the digital model; The computing program according to claim 31, further comprising a step of: displaying or outputting a result of the disaster simulation.

33. The computational program described in claim 32 executes at least one of the following steps based on the results of the simulation: determining the continued usability of the underground structure and outputting the result; outputting an evacuation instruction; calculating and outputting materials required for repairs and reinforcement; and outputting the result so that materials required for repairs and reinforcement can be arranged.

34. An underground structure that is provided so as to be capable of carrying out the underground structure evaluation method according to any one of claims 1 to 8, and from which the evaluation results can be obtained.

35. An underground structure comprising the evaluation system according to claim 21 or 22, wherein the evaluation result is obtained.

36. An underground structure comprising the evaluation system according to claim 23 or 24, wherein the evaluation result can be obtained.

37. An underground structure comprising the calculation program according to claim 25, and from which the evaluation result can be obtained.

38. An underground structure comprising the calculation program according to claim 28, and from which the evaluation result can be obtained.

39. An underground structure comprising the calculation program according to claim 31, and from which the evaluation result can be obtained.

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