Ground evaluation device and program

Abstract

To comprehensively determine the ground conditions and accurately evaluate whether the conditions of the ground are suitable for excavating a mountain tunnel.SOLUTION: A ground evaluation device 10 comprises a first data acquisition unit that acquires drilling data measured when multiple steel pipes 5 are drilled and cast radially into the ground in front of a tunnel face where a tunnel is excavated, a second data acquisition unit that acquires injection data measured when solidifying material is injected from within the steel pipes 5 into the surrounding ground, a first determination unit that determines the hardness of the ground based on the drilling data and classifies the hardness of the ground into a plurality of stages, a second determination unit that determines the porosity of the ground based on the injection data and classifies the porosity of the ground into a plurality of stages, and an evaluation unit that integrates the determination results by the first determination unit and the determination results by the second determination unit and comprehensively evaluates the properties of the ground for each location where each steel pipe is cast.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a natural ground evaluation device and a program. [Background technology]

[0002] When excavating mountain tunnels, for example, it is very important to quantitatively understand the ground conditions around the tunnel face and in front of it in order to quickly apply optimal supports. Conventionally, drilling exploration using non-core drilling, for example, using a drill jumbo or a non-core advanced boring machine, has been known as a technique for conducting forward exploration of a tunnel face and quantitatively grasping the ground conditions around the face and in front of it (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-127655 Summary of the Invention [Problem to be solved by the invention]

[0004] In conventional drilling exploration using non-core drilling, the drilling energy required for drilling is calculated based on the machine data during non-core drilling, and the natural ground properties are evaluated mainly from this drilling energy. In other words, the hardness of the natural ground is derived from the drilling energy, and the natural ground properties are evaluated based on that. However, if the evaluation of the natural ground properties is performed based on a single element, the drilling energy, it is thought that the evaluation will be biased. Therefore, it is required to incorporate elements other than the drilling energy to evaluate the natural ground properties more comprehensively and improve the accuracy of the evaluation. In addition, when the nature of the ground is evaluated based on multiple elements, it is difficult to determine the nature of the ground from the numerical values ​​that indicate the evaluation, for example. Therefore, there is a demand for something that makes it easier to determine the nature of the ground.

[0005] The present invention has been made in consideration of the above-mentioned circumstances, and its purpose is to comprehensively judge the ground conditions and accurately evaluate whether the ground conditions are suitable for excavating a mountain tunnel.

[0006] Another object is to make it possible to easily visually judge the properties of the ground that have been evaluated in a comprehensive manner. [Means for solving the problem]

[0007] The invention described in claim 1 is a ground evaluation device, a first data acquisition unit that acquires drilling data measured when a plurality of steel pipes are radially drilled and driven into the ground in front of the tunnel face where the tunnel is excavated; a second data acquisition unit that acquires injection data measured when a solidification material is injected from inside the plurality of steel pipes into the surrounding natural ground; A first determination unit that determines the hardness of the natural ground based on the drilling data and classifies the hardness of the natural ground into a plurality of levels; a second determination unit that determines the porosity of the natural ground based on the injection data and classifies the porosity of the natural ground into a plurality of levels; The present invention is characterized in that it is equipped with an evaluation unit that integrates the judgment results by the first judgment unit and the judgment results by the second judgment unit, and comprehensively evaluates the properties of the ground for each location where each of the steel pipes is cast.

[0008] The invention described in claim 2 is the ground evaluation device according to claim 1, A display control unit is further provided for displaying an evaluation result by the evaluation unit on a display unit, The first determination unit and the second determination unit perform determination based on a predetermined determination index, The judgment index includes a plurality of colors corresponding to a plurality of stages indicating the hardness of the natural ground, and a plurality of colors corresponding to a plurality of stages indicating the porosity of the natural ground, The display control unit displays a steel pipe model, which is a model of the steel pipe, on the display unit, The steel pipe model is characterized in that it is colored with the color indicating the hardness of the natural ground and the color indicating the porosity of the natural ground.

[0009] The invention described in claim 3 is the ground evaluation device described in claim 2, The steel pipe has a plurality of steel pipe bodies continuous in the axial direction, The steel pipe model is characterized in that each of the multiple steel pipe bodies is colored with the color indicating the hardness of the ground and the color indicating the porosity of the ground.

[0010] The invention described in claim 4 is the ground evaluation device according to claim 1, A display control unit is further provided for displaying an evaluation result by the evaluation unit on a display unit, The display control unit is characterized in that an evaluation comment corresponding to a result of the evaluation by the evaluation unit is displayed on the display unit.

[0011] The invention described in claim 5 is a program, The computer of the ground evaluation device, a first data acquisition unit for acquiring drilling data measured when a plurality of steel pipes are radially drilled and driven into the ground in front of the tunnel face where the tunnel is excavated; a second data acquisition unit that acquires injection data measured when a solidification material is injected from inside the plurality of steel pipes into the surrounding natural ground; a first determination unit that determines the hardness of the natural ground based on the drilling data and classifies the hardness of the natural ground into a plurality of levels; a second determination unit that determines a porosity of the natural ground based on the injection data and classifies the porosity of the natural ground into a plurality of levels; an evaluation unit that integrates the judgment result by the first judgment unit and the judgment result by the second judgment unit and comprehensively evaluates the properties of the natural ground for each portion where each of the steel pipes is installed; Function as. Effect of the Invention

[0012] According to the present invention, the natural ground can be judged in a comprehensive manner and it can be accurately evaluated whether the natural ground conditions are suitable for excavating a mountain tunnel.

[0013] In addition, the properties of the ground that have been evaluated in a comprehensive manner can be easily judged visually. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a diagram showing an overview of a natural ground evaluation system. [Diagram 2] FIG. 2 is a block diagram showing the configuration of a natural ground evaluation device. [Diagram 3] FIG. 13 is a diagram illustrating an example of a criteria table. [Figure 4] FIG. 13 is a diagram illustrating an example of a judgment color-coding table. [Diagram 5] FIG. 13 is a diagram illustrating an example of a comment table. [Figure 6] FIG. 13 is a diagram showing the display contents of a first comprehensive evaluation display screen. [Figure 7] FIG. 13 is a diagram showing the display content of a second comprehensive evaluation display screen. [Figure 8] This figure explains a 3D model of a tunnel as a comprehensive evaluation that combines a 3D model of a tunnel that represents the strength of the natural ground and the drilling energy, and a 3D model of a tunnel that represents the porosity of the natural ground and the amount of chemical solution injected. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] Hereinafter, the embodiments of the present invention will be described with reference to the drawings. However, the embodiments described below are subject to various technically preferable limitations for carrying out the present invention, but the technical scope of the present invention is not limited to the following embodiments and illustrated examples.

[0016] [Tunnel excavation procedures and ground evaluation system] As shown in Figure 1, the excavation of a mountain tunnel involves placing a drill jumbo 2, a heavy construction machine, near the tunnel face 1, setting a leading pipe 5a, a steel pipe, and an inner rod against a guide cell 4 attached to the end of a boom 3 of the drill jumbo 2, and performing the initial drilling (also called drilling) and casting work. Next, the intermediate pipe 5b, a steel pipe that follows the leading pipe 5a, and the rod are joined, and then drilling and casting work is carried out. After that, the joining work and drilling and casting work of the terminal pipe 5c, a steel pipe that follows the intermediate pipe 5b, are repeated, and when the casting work is completed, the bit and rod are retrieved. The steel pipes (hereinafter referred to as reinforcing pipes 5), consisting of the leading pipe 5a, intermediate pipe 5b, and terminal pipe 5c, are cast in multiples according to the tunnel shape and arranged in an arch shape (radial). After that, injection work is performed from inside each steel pipe, the leading pipe 5a, the intermediate pipe 5b, and the terminal pipe 5c, into the natural ground. That is, in the injection work, a solidification material (chemical solution) is injected into the reinforcing pipe 5 consisting of the leading pipe 5a, the intermediate pipe 5b, and the terminal pipe 5c, and while filling the reinforcing pipe 5 with the solidification material, the solidification material is discharged from the discharge port (not shown) of the reinforcing pipe 5 and allowed to permeate into the natural ground, thereby constructing an arch-shaped reinforcing body. Of the steel pipes 5a, 5b, 5c, the leading pipe 5a is set to be the longest, and the length (casting length) of the reinforcing pipe 5 consisting of the steel pipes 5a, 5b, 5c is set to 12.5 meters. In addition, the number of steel pipes 5a, 5b, 5c used in the reinforcing pipe 5 is not limited to three, but is changed as needed to reinforce the natural ground. Therefore, the length of the reinforcing pipe 5 is changed as needed, and the injection amount and injection pressure of the solidification material to be filled are also changed as needed. This type of excavation method is called the injection type long steel pipe fore-supporting method (AGF method) and has traditionally been used as a supplementary construction method for mountain tunnels.

[0017] In drilling and driving work performed by Drill Jumbo 2, the drilling energy required to drill holes in the natural ground can be calculated. The drilling energy is the energy required to drill a unit volume based on the machine data acquired when drilling into the natural ground. The drilling energy is calculated based on the average value obtained by acquiring machine data for each unit distance of a specified distance in the natural ground and statistically processing the machine data at specified intervals. By calculating the drilling energy in this way, it becomes possible to determine the hardness of the natural ground, i.e., whether the natural ground is weak or hard rock. In this embodiment, for example, as shown in Fig. 3, the hardness of the natural ground is determined by classifying it into five levels according to the calculated value of the drilling energy. The drill jumbo 2 is provided with a measuring device that measures machine data such as the impact energy and the number of impacts when drilling work is performed by the guide cell 4. In other words, the natural ground evaluation system of this embodiment is provided with a first measuring unit 4a (measuring device) that measures machine data during drilling work.

[0018] Furthermore, during the injection work, data on the amount of solidification material injected is collected. By collecting data on the amount of solidification material injected in this manner, it becomes possible to determine how much solidification material has been injected into the natural ground, that is, the size (abundance) of the porosity (voids) in the natural ground. In this embodiment, for example, as shown in Fig. 3, the size of the porosity of the natural ground is classified into five levels according to the collected data on the amount of solidification material injected. A pressure pump 6 is used for injecting the solidification material, and a measuring device is provided on the pressure pump 6 to measure the amount of solidification material injected when the solidification material is injected. In other words, the natural ground evaluation system of this embodiment includes a second measuring unit 6a (measuring device) that measures injection amount data when the solidification material is injected.

[0019] Here, the magnitude of the porosity of the natural ground will be explained. First, the nature of the ground in which a mountain tunnel is excavated includes not only the hardness of the ground but also factors such as the number and size of cracks. In other words, the degree of cracks in the ground is an important factor in determining the suitability of the ground for excavating a tunnel. For example, even if the ground is hard rock, if it has an extremely large number of cracks, it is difficult to ensure safety not only during tunnel construction but also after construction. Therefore, in the ground evaluation system of this embodiment, the ground properties are evaluated based on two factors: the hardness of the ground and the porosity of the ground.

[0020] As shown in FIG. 1, the first measuring unit 4a and the second measuring unit 6a are communicably connected to a natural ground evaluation device 10, and transmit the acquired measurement data to the natural ground evaluation device 10. That is, the natural ground evaluation system of this embodiment is configured to include a natural ground evaluation device 10, a first measurement unit 4a that the drill jumbo 2 has, and a second measurement unit 6a that the pressure pump 6 has. It is assumed that the data transmitted from the first measuring unit 4a and the second measuring unit 6a to the rock mass evaluation device 10 is linked to identification information for identifying the position of the reinforcing pipe 5 measured by the first measuring unit 4a and the second measuring unit 6a.

[0021] [About the ground evaluation device] The natural ground evaluation device 10 is configured by a general-purpose personal computer, but may be configured by a dedicated device, terminal, or the like. As shown in FIG. 2, the natural ground evaluation device 10 includes a calculation unit 11, a storage unit 12, a communication unit 13, a display unit 14, and an operation unit 15. The units 11 to 15 are electrically connected to each other via a bus or the like. The display unit 14 and the operation unit 15 may be integrated together.

[0022] The calculation unit 11 is composed of a CPU, a RAM (Random Access Memory), a ROM (Read Only Memory), and the like. The ROM stores various programs executed by the CPU. The CPU of the calculation unit 11 reads out various programs stored in the memory unit 12 and expands them in the RAM, and executes various processes according to the expanded programs, thereby providing centralized control of the operation of the ground evaluation device 10.

[0023] The storage unit 12 is composed of a non-volatile memory, a hard disk, or the like. The storage unit 12 stores various programs executed by the calculation unit 11, various data required for executing the programs, and the like. The various programs include at least a drilling energy calculation program, a first judgment program, a second judgment program, a comprehensive evaluation program, and a display control program. Details of these programs will be described later. The various programs include other programs necessary for the operation of the system as appropriate. The various data include at least a judgment criteria table 121, a judgment color-coding table 122, and a comment table 123. Details of these data will be described later. The various data also include other data and parameters necessary for the operation of the present system as appropriate.

[0024] The communication unit 13 is composed of a communication module and the like. The communication unit 13 is configured to transmit and receive various signals and various data to and from other devices connected by wire or wirelessly via a communication network.

[0025] In this embodiment, the computer (the calculation unit 11) of the natural ground evaluation device 10 receives, via the communication unit 13, machine data (drilling data) measured by the first measurement unit 4a during the drilling operation. That is, the calculation unit 11 and the communication unit 13 function as a first data acquisition unit which is a data acquisition means for acquiring machine data (drilling data) measured by the first measurement unit 4a during the drilling operation. Furthermore, the machine data (punching data) acquired by the first data acquisition unit may be stored in the storage unit 12. The data is linked to the above-mentioned identification information.

[0026] Furthermore, the computer (the calculation unit 11) of the natural ground evaluation device 10 receives, via the communication unit 13, data on the amount of solidification material injected measured by the second measurement unit 6a. In other words, the calculation unit 11 and the communication unit 13 function as a second data acquisition unit, which is a data acquisition means for acquiring data on the amount of solidification material injected measured by the second measurement unit 6a. Moreover, the injection amount data of the solidification material acquired by the second data acquisition unit may be stored in the storage unit 12. The data is linked to the above-mentioned identification information.

[0027] These data acquisition means are always in a functioning state while the tunnel excavation work is being carried out, but data may be acquired at a predetermined timing, such as by timer control or after a data acquisition instruction signal has been sent or received. In this case, the natural ground evaluation device 10 has a program for timing control, and the above-mentioned data acquisition is performed in conjunction with the execution of the program.

[0028] The display unit 14 is configured with an LCD (Liquid Crystal Display), an EL (Electro Luminescence) display, etc. The display unit 14 performs various displays according to display information instructed by the CPU of the calculation unit 11.

[0029] The operation unit 15 has a key input unit such as a keyboard and a pointing device such as a mouse. The operation unit 15 accepts key operation input and position operation input from the user, and outputs the operation information to the calculation unit 11. The calculation unit 11 accepts the input operation of the user based on the information transmitted from the operation unit 15.

[0030] The display unit 14 in this embodiment is attached as a part of the natural ground evaluation device 10, but is not limited to this and may be a display device such as an LCD or EL in another computer communicatively connected via the communication unit 13. In other words, the contents displayed on the display unit 14 can be confirmed via an external computer such as a smartphone or tablet terminal. Similarly, the operation unit 15 of this embodiment is attached as a part of the natural ground evaluation device 10, but is not limited to this and may be a key input unit or a pointing device in another computer communicatively connected via the communication unit 13. In other words, the same operations as those of the operation unit 15 can be performed via an external computer such as a smartphone or tablet terminal. In other words, the natural ground evaluation device 10 can be remotely operated by a display unit and an operation unit of an external computer through the communication unit 13.

[0031] [About the drilling energy calculation program] The flow of the process that the drilling energy calculation program causes the natural ground evaluation device 10, which is a computer, to execute will be described below.

[0032] First, when the first data acquisition unit acquires the above-mentioned machine data (drilling data) transmitted from the first measurement unit 4a, the calculation unit 11 recognizes this and starts executing the drilling energy calculation program. Then, the drilling energy required for drilling a unit volume is calculated based on the acquired machine data.

[0033] The calculated drilling energy may be stored in the memory unit 12. Since the machine data, which is the original data of the drilling energy, is linked to identification information as described above, the drilling energy data calculated by the drilling energy calculation program is also linked to the same identification information.

[0034] [About the first assessment program] The flow of processes that the first judgment program causes the natural ground evaluation device 10, which is a computer, to execute will be described below.

[0035] The first judgment program is intended to judge the hardness of the ground based on the calculated drilling energy (drilling data) and classify the hardness of the ground into multiple stages, and is launched when the drilling energy is calculated by the drilling energy calculation program. That is, when the drilling energy is calculated, the calculation unit 11 judges the hardness of the natural ground according to the numerical value of the drilling energy. When judging the hardness of the natural ground, the calculation unit 11 acquires the judgment result by referring to the judgment criterion table 121 (judgment index) shown in FIG.

[0036] In the judgment criteria table 121, a column 121a for the judgment type "drilling data" shows an item of "judgment content" for classifying the hardness of natural ground into a plurality of levels. In this embodiment, the items of the judgment contents are divided into, for example, five levels according to the hardness of the natural ground. 3 "Less than" and "100~120J / cm 3 "Less than" and "120~150J / cm 3 "Less than" and "150~180J / cm 3 "Less than" and "180J / cm 3 The above items are included. In this embodiment, the items of judgment content are divided into five levels, but they may be divided into multiple levels, and the number of levels can be changed as appropriate without departing from the spirit of the present invention. The unit is J / cm 3 (J=Joule), but there are other units such as J / cm 3 It is also possible to use MPa (megapascals), which represents the rock strength estimated from the above. In addition, the threshold value of each stage (J / cm 3 ) may also be modified as appropriate without departing from the spirit of the present invention.

[0037] Next to the "Judgment Content" items is a "Judgment Result" item that corresponds to each "Judgment Content" item, which shows a number indicating the level of hardness of the ground. 0~100J / cm 3 The level of the "judgment result" corresponding to the item "less than" is "1", and the ground at level 1 is vulnerable ground requiring countermeasures (see the supplementary section). 100~120J / cm 3 The level of the "judgment result" corresponding to the item "less than" is "2," and level 2 ground is weak ground requiring caution (see supplementary section). 120~150J / cm 3 The level of the "judgment result" corresponding to the item "less than" is "3", and the ground of level 3 is soft rock ground. (See the supplementary item.) 150~180J / cm 3 The level of the "judgment result" corresponding to the item "less than" is "4," and the ground of level 4 is medium-hard rock ground (see supplementary section). "180J / cm 3 The level of the "judgment result" corresponding to the item "above" is "5," and the ground of level 5 is hard rock ground (see supplementary section). That is, the higher the energy required to drill holes in the natural ground, the higher the hardness level of the natural ground is set.

[0038] In the judgment process using the first judgment program, it is determined which of the judgment content items the acquired drilling energy value corresponds to, and as a result, it is determined what level of hardness the part of the ground where drilling was performed corresponds to.

[0039] Furthermore, the judgment results derived as described above are color-coded according to a number of stages indicating the hardness of the natural ground, taking into consideration that the information is displayed on the display unit 14. That is, when the judgment process by the first judgment program derives the judgment result indicating the level of hardness of the drilled portion of the ground, the calculation unit 11 refers to the judgment color-coding table 122 (judgment index) shown in Figure 4 and associates the judgment result with a color representing that level.

[0040] In other words, the judgment index includes a plurality of colors corresponding to a plurality of stages indicating the hardness of the natural ground. In this embodiment, the plurality of colors are provided with a gradation such that the higher the level of the natural ground hardness, the cooler the colors are, and the lower the level, the warmer the colors are. Moreover, the color associated with the determination result derived by the determination process according to the first determination program is set to a high density so as to be distinguishable from the injection amount data.

[0041] The judgment results derived by the first judgment program as described above are stored in the storage unit 12 in association with colors indicating the levels of hardness of the natural ground. In addition, since the drilling energy data is linked to identification information for identifying the position of the reinforcing pipe 5 from which the data was obtained, the judgment results derived by the judgment process using the first judgment program are also linked to identification information for each reinforcing pipe 5 and stored in the memory unit 12.

[0042] [About the second assessment program] The flow of the processes that the second judgment program causes the natural ground evaluation device 10, which is a computer, to execute will be described below.

[0043] The second judgment program is intended to judge the porosity of the ground based on the injection amount data (injection data) of the solidification material and to classify the porosity of the ground into a plurality of levels, and is started when the second data acquisition unit acquires the above-mentioned injection amount data from the second measurement unit 6a. That is, when the second data acquisition unit acquires the injection amount data of the solidification material, the calculation unit 11 judges the porosity of the natural ground according to the numerical value of the injection amount data of the solidification material. When judging the porosity of the natural ground, the calculation unit 11 acquires the judgment result by referring to the judgment criterion table 121 (judgment index) shown in FIG.

[0044] In the judgment criteria table 121, a column 121b for the judgment type "injection data" shows an item of "judgment content" for classifying the porosity of natural ground into a plurality of levels. In this embodiment, the items of judgment content are divided into, for example, five levels according to the porosity of the natural ground, and in this embodiment, include the items "200% or more of the fixed amount", "150% to less than 200% of the fixed amount", "100% to less than 150% of the fixed amount", "50% to less than 100% of the fixed amount", and "less than 50% of the fixed amount". The fixed amount is the designed injection amount, for example, 125 kg (10 kg per meter). In addition, in this embodiment, the items of judgment content are divided into five levels, but they may be divided into multiple levels, and the number of levels can be changed as appropriate without departing from the spirit of the present invention. Furthermore, the threshold values ​​(%) for each stage can also be changed as appropriate without departing from the spirit of the present invention.

[0045] Next to the "Judgment Content" items is a "Judgment Result" item corresponding to each "Judgment Content" item, which shows a number representing the level of porosity of the natural ground. The level of the "judgment result" corresponding to the item "200% or more of the fixed quantity" is "1", and a level 1 rock mass is one with a high porosity (see the supplementary section). The level of the "judgment result" corresponding to the item "less than 150% to 200% of the fixed quantity" is "2," and a level 2 rock mass has a somewhat large porosity (see the supplementary section). The level of the "Judgment Result" corresponding to the item "less than 100% to 150% of the quantitative value" is "3," and the level 3 rock mass has a medium porosity. (See the supplementary section.) The level of the "judgment result" corresponding to the item "less than 50 to 100% of the quantitative value" is "4," and a level 4 rock mass has a somewhat small porosity (see the supplementary section). The level of the "judgment result" corresponding to the item "less than 50% of the fixed amount" is "5", and a level 5 rock mass has a low porosity (see the supplementary section). That is, the lower the porosity of the ground, the higher the porosity level is set for the ground. In other words, the lower the amount of solidification material injected into the ground, the less (smaller) the cracks are, or the more clayey the ground is.

[0046] Therefore, in the judgment process using the second judgment program, it is determined which of the judgment content items the acquired numerical data on the injection amount of solidification material corresponds to, and as a result, it is determined what level of porosity the part of the ground where the solidification material was injected corresponds to. The judgment results derived by such a second judgment program are stored in the memory unit 12. Since the injection amount data of the solidification material is linked to identification information for identifying the position of the reinforcing pipe 5 from which the data was obtained, the judgment results derived by the judgment process by the second judgment program are also linked to identification information for each reinforcing pipe 5 and stored in the memory unit 12.

[0047] Furthermore, the judgment results derived as described above are color-coded according to a number of stages indicating the porosity of the natural ground, taking into consideration that the information is displayed on the display unit 14. That is, when the judgment process by the second judgment program derives the judgment result indicating what level of porosity the drilled portion of the ground corresponds to, the calculation unit 11 refers to the judgment color-coding table 122 (judgment index) shown in Figure 4 and associates the judgment result with a color representing that level.

[0048] In other words, the judgment index includes a plurality of colors corresponding to a plurality of stages indicating the porosity of the natural ground. In this embodiment, the plurality of colors are provided with a gradation such that, for example, the higher the level of the natural ground porosity, the cooler the color system, and the lower the level, the warmer the color system. In addition, the color associated with the determination result derived by the determination process by the second determination program is set to a low density so as to be distinguishable from the data on the drilling energy. In other words, the color associated with the data on the drilling energy and the color associated with the data on the injection amount are the same color but have different shadings.

[0049] The judgment results derived by the second judgment program as described above are stored in the memory unit 12 in association with colors indicating the levels of porosity of the natural ground. In addition, since the solidification material injection amount data is linked to identification information for identifying the position of the reinforcing pipe 5 from which the data was obtained, the judgment results derived by the judgment process using the second judgment program are also linked to identification information for each reinforcing pipe 5 and stored in the memory unit 12.

[0050] [About the Comprehensive Evaluation Program] The flow of processes that the comprehensive evaluation program causes the natural ground evaluation device 10, which is a computer, to execute will be described below.

[0051] The comprehensive evaluation program is intended to integrate the judgment results from the first judgment program and the second judgment program, and to evaluate the properties of the ground for each location where each reinforcing pipe 5 is cast. After the judgment process is performed by the first judgment program, the judgment process is performed by the second judgment program, and the comprehensive evaluation program is launched when the judgment results derived by the second judgment program are stored in the memory unit 12. That is, when the judgment results from the first judgment program and the judgment results from the second judgment program are stored in the memory unit 12, the calculation unit 11 integrates the judgment results.

[0052] The determination result from the first determination program and the determination result from the second determination program are integrated, for example, by the following method. First, a number representing the level of the assessment result by the first assessment program is assigned to the tens digit, and a number representing the level of the assessment result by the second assessment program is assigned to the ones digit. Then, a two-digit number consisting of these numbers is treated as the result of the assessment by the comprehensive assessment program.

[0053] More specifically, for example, if the number representing the level of the judgment result from the first judgment program is "5" and the number representing the level of the judgment result from the second judgment program is "3," when these are integrated by the comprehensive evaluation program, a two-digit number, "53," is derived. This two-digit number is the result of the evaluation by the comprehensive evaluation program. The two-digit numerical value, which is the judgment result derived by the comprehensive evaluation program, is stored in the memory unit 12.

[0054] Furthermore, the comprehensive evaluation program extracts evaluation comments corresponding to the evaluation results from the comment table 123 shown in FIG. A plurality of evaluation comments corresponding to the evaluation results by the comprehensive evaluation program are stored in the comment table 123. For example, the above evaluation result of "53" is associated with the evaluation comment "hard rock ground with slightly developed cracks." Such evaluation comments have different contents for each double-digit number integrated by the comprehensive evaluation program. The evaluation comments extracted by the comprehensive evaluation program are displayed on the display unit 14, for example, as shown in FIG.

[0055] The evaluation comments stored in the comment table 123 are composed of a combination of text regarding the hardness of the natural ground and text regarding the porosity of the natural ground. In this embodiment, the judgment results by the first judgment program are divided into five levels according to the hardness of the ground, and the judgment results by the second judgment program are divided into five levels according to the porosity of the ground, so that 25 types of evaluation comments are stored in the comment table 123. The comprehensive evaluation program extracts evaluation comments from 25 types of evaluation comments that correspond to a two-digit number obtained by combining a number representing the level of the evaluation result from the first evaluation program and a number representing the level of the evaluation result from the second evaluation program.

[0056] The data of the evaluation results derived by the comprehensive evaluation program is stored in the storage unit 12 together with the evaluation comments. In addition, the judgment results obtained by the first judgment program and the judgment results obtained by the second judgment program are linked to identification information for identifying the position of the reinforcing pipe 5 from which the data was obtained, and therefore the evaluation result data derived by the comprehensive evaluation program is also linked to identification information for each reinforcing pipe 5 and stored in the memory unit 12.

[0057] In addition, the method of integrating the judgment results from the first judgment program and the judgment results from the second judgment program using the comprehensive evaluation program is not limited to the above, and can be modified as appropriate within the scope of the present invention.

[0058] Furthermore, the evaluation result data derived by the comprehensive evaluation program may be evaluated by further incorporating other factors such as the geological conditions of the natural ground.

[0059] [About the display control program] The flow of processes that the display control program causes the natural ground evaluation device 10, which is a computer, to execute will be described below.

[0060] The display control program controls the display of the evaluation results derived by the comprehensive evaluation program on the display unit 14, and is started when the evaluation results are derived by the comprehensive evaluation program. That is, when the judgment results from the first judgment program and the judgment results from the second judgment program are integrated by the comprehensive evaluation program and the evaluation result data including the evaluation comments are stored in the memory unit 12, the calculation unit 11 displays the evaluation result on the display unit 14 as a comprehensive evaluation display screen as shown in Figures 6 and 7, for example.

[0061] In this embodiment, the overall evaluation display screen is displayed on the display unit 14 after a user viewing the evaluation results performs an operation permitted by the operation unit 15. That is, the display control program is started, and after a predetermined operation is performed by the user, the overall evaluation display screen is displayed on the display unit 14. However, this is not limited to this, and the overall evaluation display screen may be automatically displayed on the display unit 14 when the display control program is started.

[0062] Such a display control program performs control to display a steel pipe model 50, which is a model of the reinforcing pipe 5, on the display unit 14 (see Figs. 6 and 7). The reinforcing pipe 5 of this embodiment is composed of the leading pipe 5a, the intermediate pipe 5b, and the terminal pipe 5c as described above. Therefore, the steel pipe model 50 also has a leading pipe portion 51, an intermediate pipe portion 52, and an terminal pipe portion 53. Furthermore, each of the leading pipe portion 51, the intermediate pipe portion 52, and the terminal pipe portion 53 has a first colored region 51a, 52a, 53a colored in a color indicating the hardness of the natural ground based on the judgment result by the first judgment program, and a second colored region 51b, 52b, 53b colored in a color indicating the porosity of the natural ground based on the judgment result by the second judgment program.

[0063] The first colored regions 51a, 52a, 53a are arranged along the central axis of the steel pipe model 50, and the second colored regions 51b, 52b, 53b are arranged along both side edges of the first colored regions 51a, 52a, 53a. This arrangement is based on the image of the leading pipe 5a, the intermediate pipe 5b, and the end pipe 5c being drilled and cast, and the solidification material being discharged from the discharge ports of each of the steel pipes 5a, 5b, 5c and permeating into the natural ground.

[0064] The display control program also controls the display unit 14 to display a tunnel model 60 that represents a model of the tunnel, and also controls the display of a plurality of steel pipe models 50 corresponding to a plurality of reinforcing pipes 5 drilled and cast into the natural ground, superimposed on the tunnel model 60 (see FIG. 6). The tunnel model 60 shows a face portion 61 indicating the position of the face 1 and a central portion 62 indicating the position of the central axis of the tunnel model 60 .

[0065] The display control program also controls the display of evaluation comment display fields 141, 142, and 143 that display evaluation comments extracted from the comment table 123 on the display unit 14 (see FIG. 7). The evaluation comment display fields 141, 142, and 143 can be displayed vertically alongside the steel pipe model 50. The evaluation comment display columns 141 , 142 , and 143 include a first evaluation comment display column 141 , a second evaluation comment display column 142 , and a third evaluation comment display column 143 . The first evaluation comment display field 141 is arranged vertically next to the leading pipe portion 51 of the steel pipe model 50 , and displays the evaluation comment corresponding to the leading pipe portion 51 . The second evaluation comment display field 142 is arranged vertically next to the intermediate pipe portion 52 in the steel pipe model 50 , and displays the evaluation comment corresponding to the intermediate pipe portion 52 . The third evaluation comment display field 143 is arranged vertically alongside the end pipe portion 53 of the steel pipe model 50 , and displays the evaluation comment corresponding to the end pipe portion 53 .

[0066] 6 and 7 show comprehensive evaluation display screens that are displayed on the display unit 14 under the display control by the display control program as described above. 6 is a first comprehensive evaluation display screen in a state where a plurality of steel pipe models 50 are overlaid on a tunnel model 60. Each of the plurality of steel pipe models 50 overlaid on the tunnel model 60 has a leading pipe portion 51, an intermediate pipe portion 52, and a terminal pipe portion 53, and each of the portions 51, 52, 53 has a first colored region 51a, 52a, 53a and a second colored region 51b, 52b, 53b, respectively. Such a first comprehensive evaluation display screen is displayed on the display unit 14 after the user performs an operation to permit using the operation unit 15 as described above, but may be displayed automatically when the display control program is started. Also, it may be set so that it can be displayed on the display unit 14 at a timing after all reinforcing pipes 5 for one stroke have been constructed and the injection of the solidification material has been completed.

[0067] FIG. 7 is a second comprehensive evaluation display screen that displays the evaluation results of a steel pipe model 50 selected by the user through the operation unit 15 from among the multiple steel pipe models 50 displayed on the first comprehensive evaluation display screen. As described above, this second overall evaluation display screen displays the steel pipe model 50 selected by the user and evaluation comment display fields 141, 142, and 143 in which evaluation comments corresponding to the evaluation results of that steel pipe model 50 are entered.

[0068] Although not shown in the figure, in addition to the above-mentioned steel pipe model 50, tunnel model 60, evaluation comment display fields 141, 142, 143, etc., the display unit 14 appropriately displays objects such as buttons necessary for screen operation by the operation unit 15. In addition, a type of overall evaluation display screen different from the overall evaluation display screens of Figures 6 and 7 may be displayed on the display unit 14, and in that case, objects such as buttons for transitioning to the different type of overall evaluation display screen are appropriately displayed in the overall evaluation display screens of Figures 6 and 7.

[0069] [Ground assessment process] When evaluating the natural ground that is reinforced by driving a plurality of reinforcing pipes 5 and injecting a solidification material, first, the first measuring unit 4a measures machine data (drilling data) during drilling work when drilling and driving the reinforcing pipes 5. The machine data measured by the first measuring unit 4a is transmitted to the natural ground evaluation device 10. In addition, the data transmitted from the first measuring unit 4a to the natural ground evaluation device 10 is linked to identification information for identifying the position of the reinforcing pipe 5 measured by the first measuring unit 4a.

[0070] Next, the calculation unit 11 of the natural ground evaluation device 10 calculates the drilling energy, which is the energy required to drill a unit volume, based on the acquired machine data. The calculated drilling energy is then stored in the storage unit 12 in a state linked to the above-mentioned identification information.

[0071] Next, the amount of solidification material injected is measured by the second measurement unit 6a when the solidification material is injected and seeped into the natural ground from the reinforcing pipe 5. The injection amount data of the solidification material measured by the second measurement unit 6a is transmitted to the natural ground evaluation device 10, and the natural ground evaluation device 10 stores the injection amount data transmitted from the second measurement unit 6a in the memory unit 12. The injection amount data transmitted from the second measuring unit 6a is associated with identification information for identifying the position of the reinforcing tube 5 at which the measurement was performed by the second measuring unit 6a.

[0072] Next, the ground evaluation device 10 judges the hardness of the ground based on the drilling energy (drilling data) by the first judgment program, and classifies the hardness of the part of the ground where the reinforcing pipe 5 to be judged is cast into a plurality of levels. Furthermore, the ground evaluation device 10 refers to the judgment color-coding table 122 (judgment index) to associate a color indicating the level with the judgment result. Moreover, the natural ground evaluation device 10 stores the judgment results derived by the first judgment program in the storage unit 12 in a state where a color indicating each level of natural ground hardness is associated with the judgment result data. Note that the judgment result data is linked to the above-mentioned identification information.

[0073] Next, the natural ground evaluation device 10 judges the porosity of the natural ground based on the injection amount data of the solidification material by the second judgment program, and classifies the porosity of the part of the natural ground where the reinforcing pipe 5 to be judged is cast into a plurality of levels. Furthermore, the natural ground evaluation device 10 refers to the judgment color-coding table 122 (judgment index) and associates a color indicating the level with the judgment result. Moreover, the natural ground evaluation device 10 stores the judgment results derived by the first judgment program in the storage unit 12 in a state where a color indicating each level of the natural ground porosity is associated with the judgment result data. Note that the judgment result data is linked to the above-mentioned identification information.

[0074] When the judgment results from the first judgment program and the judgment results from the second judgment program are stored in the memory unit 12, the ground evaluation device 10 integrates the judgment results from the first judgment program and the judgment results from the second judgment program, evaluates the properties of the ground for each location where each reinforcing pipe 5 is driven, and derives an evaluation result. The derived evaluation result data is stored in the storage unit 12 in a state including the evaluation comment extracted from the comment table 123. Note that this evaluation result data is linked to the above-mentioned identification information.

[0075] When the evaluation result data including the evaluation comments is stored in the memory unit 12, the ground evaluation device 10 displays an overall evaluation display screen on the display unit 14, showing the contents of the evaluation result, after the user performs an operation permitted by the operation unit 15. The display unit 14 and the operation unit 15 may be a display unit and an operation unit of an external computer such as a smartphone or tablet terminal, enabling remote control.

[0076] The user can check the evaluation results of the ground properties displayed on the comprehensive evaluation display screen and understand the ground properties. Understanding the ground properties in this way leads to improved safety during tunnel construction and after construction.

[0077] [Regarding beneficial effects] According to this embodiment, the judgment results of the natural ground hardness, which are classified into a plurality of stages, and the judgment results of the natural ground porosity, which are classified into a plurality of stages, are integrated to evaluate the natural ground properties for each portion where each steel pipe 5a, 5b, 5c is driven, so that the natural ground properties can be evaluated based on a plurality of elements, namely, the natural ground hardness and the natural ground porosity. Therefore, unlike the case where the natural ground properties are evaluated based on only one of the elements, the natural ground properties can be evaluated in a more comprehensive manner, so that the accuracy of the evaluation can be improved. Moreover, since the judgment results of each of these elements are classified into a plurality of stages, the natural ground properties can be evaluated based on a plurality of elements classified into a plurality of stages, so that the accuracy of the evaluation can be further improved.

[0078] Moreover, a steel pipe model 50, which is a model of the reinforcing pipe 5, is displayed on the display unit 14, and the steel pipe model 50 is colored with a color indicating the hardness of the ground and a color indicating the porosity of the ground, and the colors correspond to a plurality of stages indicating the hardness of the ground and a plurality of stages indicating the porosity of the ground, so that a user who checks the steel pipe model 50 displayed on the display unit 14 can visually grasp the properties of the ground not by numerical values ​​but by the colors indicating the hardness of the ground and the colors indicating the porosity of the ground. Therefore, it becomes possible to visually easily judge the properties of the ground evaluated in a composite manner.

[0079] In addition, the steel pipe has a number of axially continuous steel pipe bodies, namely a leading pipe 5a, an intermediate pipe 5b and an end pipe 5c, and the steel pipe model 50 which represents the steel pipe is colored with a color indicating the hardness of the ground and a color indicating the porosity of the ground for each of the multiple steel pipe bodies 5a, 5b, 5c, so that the compositely evaluated properties of the ground can be easily visually judged for each location where each steel pipe body 5a, 5b, 5c is cast.

[0080] Furthermore, by displaying the evaluation comments corresponding to the evaluation results of the natural ground properties on the display unit 14, the user can check the evaluation comments together with the steel pipe model 50 colored with colors indicating the hardness and porosity of the natural ground. Therefore, the user can visually judge the compositely evaluated natural ground properties by the colors and can also read the evaluation comments to make a synergistic judgment, thereby enabling a deeper understanding of the natural ground properties.

[0081] [Modifications] The embodiments to which the present invention can be applied are not limited to the above-described embodiments, and can be modified as appropriate without departing from the spirit of the present invention. Modifications are described below. The following modifications may be combined as far as possible. In each of the following modifications, elements common to the above-described embodiments are denoted by the same reference numerals, and descriptions thereof are omitted or simplified.

[0082] [Variation 1] In the above embodiment, the multiple reinforcing pipes 5 are cast in accordance with the shape of the tunnel and arranged in an arch shape. In this modified example, the construction procedure for the multiple reinforcing pipes 5 is as follows: first, in the design stage, serial numbers are assigned to the multiple reinforcing pipes 5 to be cast (see FIG. 6). That is, for example, if the designed number of reinforcing pipes 5 is 13, serial numbers from 1 to 13 are assigned to each reinforcing pipe 5 in order in the design stage. When actually driving multiple reinforcing pipes 5 into the ground, first, the reinforcing pipes 5 assigned odd numbers are driven into the ground and the solidification material is injected, and then the reinforcing pipes 5 assigned even numbers are driven into the ground and the solidification material is injected. In this modified example, the ground is reinforced using the above construction procedure.

[0083] It should be noted that when the solidification material is injected into the reinforcing pipe 5 and discharged from the discharge port of the reinforcing pipe 5 to permeate the natural ground while filling the reinforcing pipe 5 with the solidification material, the injection pressure is monitored by a measuring device (not shown), and the injection of the solidification material is terminated according to the injection pressure. Such control of the injection of the solidification material may be performed by the natural ground evaluation device 10 or by another computer device. Also, in the initial stage after starting injection of the solidification material, the material travels from the pump 6 through the hose to the reinforcing pipe 5 before penetrating into the natural ground, so approximately 5 kg of the injected amount is not included in the measurement value. Therefore, the "initial pressure" described below refers to the pressure at the time when the first 5 kg is injected. The initial pressure in this modified example is set to, for example, 1 MPa. The unit MPa is megapascals. Furthermore, the "final pressure" described below refers to the pressure at the end of the injection of the solidification material.

[0084] The amount of solidification material to be injected into the ground is set to 100% of the design injection amount, and hereinafter the design injection amount will be referred to as the "fixed amount." Furthermore, hereinafter, injecting more than the design injection amount will be referred to as an "increased amount."

[0085] When reinforcing the natural ground using a construction procedure like this modified example, the maximum injection amount of solidification material in the odd-numbered reinforcing pipes 5 (1, 3, 5, 7, 9, 11, and 13 in FIG. 6) is limited to a fixed amount (100%). The conditions for ending the injection of the solidification material are set to the following two patterns. 1. When the amount of solidification material injected is less than the fixed amount, injection is stopped when the initial pressure reaches +2.5MPa. 2. If the initial pressure remains below +2.5MPa, injection will end when the amount of solidification material injected reaches a fixed amount. In other words, the amount of solidification material injected is measured and monitored by the second measuring unit 6a, while the injection pressure of the solidification material is measured and monitored by another measuring device (which could be the second measuring unit 6a).When either of the above two patterns is met, the injection of the solidification material in the odd-numbered reinforcing pipes 5 is completed. Here, reaching an initial pressure of +2.5 MPa indicates that the injection pressure required to penetrate the solidification material into the ground is increasing, and a high injection pressure indicates that there are fewer (or smaller) cracks in the ground.

[0086] In the reinforcing pipes 5 with even numbers (2, 4, 6, 8, 10, and 12 in FIG. 6), the maximum injection amount of solidification material is set to twice the fixed amount (200%). The conditions for ending the injection of the solidification material are set to the following five patterns. 1. Injection is terminated when the injection pressure reaches the initial pressure + 2.5 MPa before the amount of solidification material injected reaches the fixed amount (100%). 2. When the amount of solidification material injected reaches a fixed amount, injection will end if the injection pressure is the initial pressure + 0.5 MPa or more. 3. When the amount of solidification material injected reaches a fixed amount, if the injection pressure is less than the initial pressure + 0.5 MPa, increase the amount of solidification material injected. 4. While increasing the amount of solidification material, stop injection when the injection pressure reaches the initial pressure + 0.5 MPa or more. 5. If the injection pressure remains below the initial pressure + 0.5 MPa while the amount of solidification material is being increased, injection will end at 200% of the maximum injection amount. In other words, when any of the above conditions is met, the injection of the solidification material into the even-numbered reinforcing pipes 5 is completed or increased.

[0087] In this modified example, a construction procedure is adopted in which the amount of solidification material injected and the injection pressure are monitored, and the injection of the solidification material is terminated when certain conditions are met; however, this is not limited to this, and a construction procedure may also be adopted in which only the injection pressure is monitored, and the injection of the solidification material is terminated based only on the injection pressure.

[0088] [Modification 2] In the above embodiment, as a method for integrating the judgment results obtained by the first judgment program and the judgment results obtained by the second judgment program, a number representing the level of the judgment result obtained by the first judgment program is assigned to the tens digit, and a number representing the level of the judgment result obtained by the second judgment program is assigned to the ones digit, and the two-digit number consisting of these numbers is treated as the result of the evaluation obtained by the comprehensive evaluation program. In contrast to this, in this modified example, as shown in FIG. 8, a method is adopted in which a first 3D model 71 and a second 3D model 72, which represent the tunnel in 3D, are integrated to generate a third 3D model 73.

[0089] The first 3D model 71 is a 3D model of a tunnel in which data of the judgment result by the first judgment program is reflected, and includes a tunnel main body portion 71a and a reinforcing pipe portion 71b representing a plurality of reinforcing pipes 5. The wall of the tunnel main body portion 71a and the reinforcing pipe portion 71b are colored with reference to the judgment color-coding table 122. That is, when the judgment process by the first judgment program derives the level of hardness of the drilled portion of the natural ground and its surroundings as a judgment result, the calculation unit 11 associates the judgment result with a color representing that level with the judgment result with reference to the judgment color-coding table 122. Therefore, the first 3D model 71 represents the strength of the natural ground and the drilling energy. In addition, a gradation is used so that the higher the level of hardness of the ground, the cooler the colors, and the lower the level, the warmer the colors.

[0090] The second 3D model 72 is a 3D model of the tunnel reflecting the data of the judgment results by the second judgment program, and comprises a tunnel main body portion 72a and a reinforcing pipe portion 72b representing a plurality of reinforcing pipes 5 and the solidification material ejected from the reinforcing pipes 5. The wall of the tunnel main body portion 72a and the reinforcing pipe portion 72b are colored with reference to the judgment color-coding table 122. That is, when the judgment process by the second judgment program derives the level of porosity of the drilled portion of the natural ground and its surroundings as the judgment result, the calculation unit 11 associates the judgment result with a color representing that level with the judgment result with reference to the judgment color-coding table 122. Therefore, the second 3D model 72 represents the porosity of the natural ground and the injection amount of solidification material. In addition, a gradation is used so that the higher the level of porosity of the ground, the cooler the colors, and the lower the level, the warmer the colors.

[0091] The third 3D model 73 is an integration of a first 3D model 71 representing the judgment result by the first judgment program and a second 3D model 72 representing the judgment result by the second judgment program, and has a tunnel main body portion 73a. The walls of the tunnel main body portion 73a are assigned a color that is a combination of color data associated with the walls of the tunnel main body portion 71a and the reinforcing pipe portion 71b in the first 3D model 71 and color data associated with the walls of the tunnel main body portion 72a and the reinforcing pipe portion 72b in the second 3D model 72. This allows a user who has checked the third 3D model 73 to visually grasp the nature of the ground not by numerical values ​​but by a color that combines the color indicating the hardness of the ground with the color indicating the porosity of the ground. This makes it possible to easily visually judge the nature of the ground that has been evaluated in a composite manner. [Explanation of symbols]

[0092] 1. Cutting Edge 2. Jumbo Drill 3. Boom 4 Guide Cell 5 Reinforcing tube 5a Top pipe 5b intermediate tube 5c Terminal tube 6. Pressure pump 10. Rock mass evaluation device 121 Criteria Table 122 Judgment color table 123 Comments Table 141 First evaluation comment display field 142 Second evaluation comment display field 143 Third evaluation comment display column 50 Steel Pipe Model 51 Top pipe part 51a First colored area 51b Second colored area 52 Intermediate pipe section 52a First colored area 52b Second colored area 53 Terminal tube part 53a First colored area 53b Second colored area 60 Tunnel Model 61 Face part 62 Center part

Claims

1. a first data acquisition unit that acquires drilling data measured when a plurality of steel pipes are radially drilled and driven into a ground in front of a tunnel face where the tunnel is excavated; a second data acquisition unit that acquires injection data measured when a solidification material is injected from inside the plurality of steel pipes into the surrounding natural ground; A first determination unit that determines the hardness of the natural ground based on the drilling data and classifies the hardness of the natural ground into a plurality of levels; a second determination unit that determines the porosity of the natural ground based on the injection data and classifies the porosity of the natural ground into a plurality of levels; a ground evaluation unit that integrates the judgment results by the first judgment unit and the judgment results by the second judgment unit, and comprehensively evaluates the properties of the ground for each location where each steel pipe is installed.

2. A display control unit is further provided for displaying an evaluation result by the evaluation unit on a display unit, The first determination unit and the second determination unit perform determination based on a predetermined determination index, The judgment index includes a plurality of colors corresponding to a plurality of stages indicating the hardness of the natural ground, and a plurality of colors corresponding to a plurality of stages indicating the porosity of the natural ground, The display control unit displays a steel pipe model, which is a model of the steel pipe, on the display unit, 2. The natural ground evaluation device according to claim 1, wherein the steel pipe model is colored with the color indicating the hardness of the natural ground and the color indicating the porosity of the natural ground.

3. The steel pipe has a plurality of steel pipe bodies continuous in the axial direction, The ground evaluation device according to claim 2, characterized in that the steel pipe model is colored for each of the multiple steel pipe bodies with a color indicating the hardness of the ground and a color indicating the porosity of the ground.

4. A display control unit for displaying an evaluation result by the evaluation unit on a display unit, The natural ground evaluation device according to claim 1 , wherein the display control unit displays an evaluation comment corresponding to a result of the evaluation by the evaluation unit on the display unit.

5. The computer of the ground evaluation device, a first data acquisition unit for acquiring drilling data measured when a plurality of steel pipes are radially drilled and driven into the ground in front of the tunnel face where the tunnel is excavated; a second data acquisition unit that acquires injection data measured when a solidification material is injected from inside the plurality of steel pipes into the surrounding natural ground; a first determination unit that determines the hardness of the natural ground based on the drilling data and classifies the hardness of the natural ground into a plurality of levels; a second determination unit that determines a porosity of the natural ground based on the injection data and classifies the porosity of the natural ground into a plurality of levels; an evaluation unit that integrates the judgment result by the first judgment unit and the judgment result by the second judgment unit and comprehensively evaluates the properties of the natural ground for each portion where each of the steel pipes is installed; A program that functions as a

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