Information processing device, program, and information processing method

Abstract

This makes it possible to evaluate the impact on the secondary lining when the primary lining deteriorates. [Solution] The information processing device 10 is equipped with a control unit 11 that acquires deterioration information indicating the degree of deterioration of a primary lining for a structure that has a primary lining and a secondary lining provided inside the primary lining, and generates a structural model representing the structure that reflects the degree of deterioration.

Description

[Technical Field]

[0001] The present disclosure relates to an information processing device, a program, and an information processing method. [Background technology]

[0002] There exists a tunnel constructed in the natural ground, which comprises a primary lining and a secondary lining along the circumferential direction of the tunnel. Figures 10A and 10B show a cross section perpendicular to the axial direction of the tunnel TN, which comprises a primary lining L1 and a secondary lining L2. As shown in Figures 10A and 10B, the primary lining L1 is provided to cover the secondary lining L2, which is located radially inside the tunnel, from the outside. The primary lining L1 includes multiple steel segments, and the secondary lining L2 includes concrete. As shown in Figure 10B, over time, the thickness of the underground tunnel TN shown in Figure 10A decreases from its original position indicated by the dashed line due to the progression of corrosion. Furthermore, deterioration of the primary lining L1 generates loads such as earth pressure or water pressure on the secondary lining L2, resulting in deformations such as cracks CR. Thus, it is expected that the overall strength of the tunnel TN will decrease over time. As a method for structural analysis of such tunnels, for example, Non-Patent Document 1 discloses a method for calculating cross-sectional forces using a model in which the primary lining is circular. For example, Non-Patent Document 2 discloses a method for designing the primary lining by evaluating the rigidity of the joints between segments using a model. [Prior art documents] [Non-patent literature]

[0003] [Non-Patent Document 1] Ikuo Fujiki and three others, "A Study on Calculation of Sectional Forces Using Beam-Spring Model Calculation Method," Tunnel Engineering Research Conference Papers and Reports, Vol. 8, pp. 307-312, 1998 [Non-patent document 2] Metropolitan Expressway Public Corporation, "Review of the Segment Design Method for Shield Tunnels" and "New Action Plan for Public Works Cost Reduction Measures" - Results for 2001, p.6, 2002 Summary of the Invention [Problem to be solved by the invention]

[0004] When evaluating the remaining strength of a tunnel with both a primary and secondary lining, a model that also takes the secondary lining into account is considered effective. There is a need to be able to evaluate the impact of deterioration of the primary lining on the secondary lining.

[0005] The purpose of the present disclosure, made in consideration of the above circumstances, is to enable evaluation of the impact on the secondary lining when the primary lining deteriorates. [Means for solving the problem]

[0006] The information processing device according to the present disclosure includes: For a structure including a primary lining and a secondary lining provided inside the primary lining, deterioration information indicating the degree of deterioration of the primary lining is acquired; The control unit generates a structural model representing the structure, reflecting the degree of deterioration.

[0007] In addition, the program according to the present disclosure The computer functions as an information processing device according to the present disclosure.

[0008] In addition, the information processing method according to the present disclosure includes: An information processing method executed by an information processing device, For a structure including a primary lining and a secondary lining provided inside the primary lining, acquiring deterioration information indicating the degree of deterioration of the primary lining; generating a structural model representing the structure, reflecting the degree of deterioration; Includes. [Effects of the Invention]

[0009] According to the present disclosure, it is possible to evaluate the impact on the secondary lining when the primary lining deteriorates. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a block diagram showing a configuration of an information processing device. [Figure 2] FIG. 10 is a diagram for explaining a tunnel. [Figure 3] 10 is a flowchart illustrating an example of the operation of the information processing device. [Figure 4] FIG. 1 is a diagram for explaining a structural model. [Figure 5] FIG. 2 is a diagram for explaining a steel segment. [Figure 6A] FIG. 10 is a diagram for explaining a tunnel. [Figure 6B] FIG. 1 is a diagram for explaining a structural model. [Figure 7] 10 is a graph showing an example of a change in bending moment. [Figure 8A] FIG. 10 is a diagram for explaining a segment ring. [Figure 8B] FIG. 10 is a diagram for explaining a segment ring. [Figure 8C] FIG. 10 is a diagram for explaining a segment joint. [Figure 8D] FIG. 10 is a diagram for explaining a segment joint. [Figure 9] FIG. 10 is a diagram for explaining a ring joint model. [Figure 10A] FIG. 10 is a diagram for explaining a tunnel. [Figure 10B] FIG. 10 is a diagram for explaining a tunnel. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings.

[0012] In each drawing, the same or corresponding parts are denoted by the same reference numerals. In the description of this embodiment, the description of the same or corresponding parts will be omitted or simplified as appropriate.

[0013] An overview of this embodiment will be described with reference to Fig. 1. An information processing device 10 according to this embodiment is, for example, a general-purpose computer such as a PC or a tablet, a server computer such as a cloud server, or a dedicated computer. "PC" is an abbreviation for personal computer.

[0014] The information processing device 10 acquires deterioration information indicating the degree of deterioration of a primary lining for a structure including a primary lining and a secondary lining provided inside the primary lining. The information processing device 10 generates a structural model representing the structure, reflecting the degree of deterioration.

[0015] In this embodiment, the structure is a tunnel. However, the structure is not limited thereto, and may be a manhole, a basement, or the like. The primary lining is provided to cover the secondary lining, which is located radially inside the tunnel, from the outside. FIG. 2 shows a tunnel T according to this embodiment. The primary lining according to this embodiment is a plurality of steel segments S provided along the circumferential direction of the tunnel T. The secondary lining according to this embodiment is made of concrete W. The tunnel T includes a shield tunnel for laying communication cables, gas pipes, power transmission lines, etc. As shown in FIG. 2, inside the tunnel T, facilities E on which cables C are installed and a walkway P for workers to move around are provided. The tunnel T is installed at a depth of, for example, 10 to 30 meters from the ground surface. Each of the plurality of steel segments S has an arc-shaped cross section. The plurality of steel segments S are connected to each other in the circumferential direction of the tunnel via segment joints. A plurality of steel segments S connected around the entire tunnel constitute a segment ring. The segment rings are further connected in the axial direction of the tunnel via ring joints. The outer surfaces of the steel segments S are provided with skin plates that come into direct contact with the soil.

[0016] According to this embodiment, it is possible to generate a structural model that represents not only the primary lining but also the secondary lining, and that reflects the degree of deterioration of the primary lining over time. By using this model, it becomes possible to perform structural analysis of a tunnel that takes into account the effects of deterioration of the primary lining. Therefore, it is possible to evaluate the effects of deterioration of the primary lining on the secondary lining.

[0017] The configuration of an information processing device 10 according to this embodiment will be described with reference to Fig. 1. The information processing device 10 includes a control unit 11, a storage unit 12, a communication unit 13, an input unit 14, and an output unit 15.

[0018] The control unit 11 includes at least one processor, at least one programmable circuit, at least one dedicated circuit, or any combination thereof. The processor is a general-purpose processor such as a CPU or GPU, or a dedicated processor specialized for specific processing. "CPU" is an abbreviation for central processing unit. "GPU" is an abbreviation for graphics processing unit. An example of the programmable circuit is an FPGA. "FPGA" is an abbreviation for field-programmable gate array. An example of the dedicated circuit is an ASIC. "ASIC" is an abbreviation for application specific integrated circuit. The control unit 11 controls each unit of the information processing device 10 and executes processing related to the operation of the information processing device 10.

[0019] The storage unit 12 includes at least one semiconductor memory, at least one magnetic memory, at least one optical memory, or any combination thereof. The semiconductor memory is, for example, a RAM, a ROM, or a flash memory. "RAM" is an abbreviation for random access memory. "ROM" is an abbreviation for read only memory. RAM is, for example, an SRAM or a DRAM. "SRAM" is an abbreviation for static random access memory. "DRAM" is an abbreviation for dynamic random access memory. ROM is, for example, an EEPROM. "EEPROM" is an abbreviation for electrically erasable programmable read only memory. Flash memory is, for example, an SSD. "SSD" is an abbreviation for solid-state drive. Magnetic memory is, for example, an HDD. "HDD" is an abbreviation for hard disk drive. The storage unit 12 functions, for example, as a main storage device, an auxiliary storage device, or a cache memory. The storage unit 12 stores information used in the operation of the information processing device 10 and information obtained by the operation of the information processing device 10.

[0020] The communication unit 13 includes at least one communication module. The communication module is, for example, a module compatible with a wired LAN communication standard such as Ethernet (registered trademark), a wireless LAN communication standard such as IEEE802.11, or a mobile communication standard such as LTE, 4G, or 5G. "LAN" is an abbreviation for local area network. "IEEE" is an abbreviation for Institute of Electrical and Electronics Engineers. "LTE" is an abbreviation for Long Term Evolution. "4G" is an abbreviation for 4th generation. "5G" is an abbreviation for 5th generation. The communication unit 13 receives information used in the operation of the information processing device 10 and transmits information obtained by the operation of the information processing device 10. The communication unit 13 enables the information processing device 10 to transmit and receive information to and from other devices via a network.

[0021] The network may include the Internet, at least one WAN, at least one MAN, or a combination thereof. "WAN" is an abbreviation for wide area network. "MAN" is an abbreviation for metropolitan area network. The network may include at least one wireless network, at least one optical network, or a combination thereof. The wireless network may be, for example, an ad hoc network, a cellular network, a wireless LAN, a satellite communication network, or a terrestrial microwave network.

[0022] The input unit 14 includes at least one input interface. The input interface is, for example, a physical key, a capacitance key, a pointing device, a touch screen integrated with a display, or a microphone. The input unit 14 accepts an operation to input information used for the operation of the information processing device 10. The input unit 14 may be connected to the information processing device 10 as an external input device instead of being provided in the information processing device 10. Any connection method may be used, such as USB (Universal Serial Bus), HDMI (High-Definition Multimedia Interface) (registered trademark), or Bluetooth (registered trademark).

[0023] The output unit 15 includes at least one output interface. The output interface is, for example, a display or a speaker. The display is, for example, an LCD (Liquid Crystal Display) or an organic EL (Electro Luminescent) display. The output unit 15 outputs information obtained by the operation of the information processing device 10. The output unit 15 may be connected to the information processing device 10 as an external output device instead of being provided in the information processing device 10. Any connection method may be used, such as USB, HDMI (registered trademark), or Bluetooth (registered trademark).

[0024] The functions of the information processing device 10 are realized by executing a program according to this embodiment on a processor serving as the control unit 11. That is, the functions of the information processing device 10 are realized by software. The program causes a computer to execute the operations of the information processing device 10, thereby causing the computer to function as the information processing device 10. That is, the computer functions as the information processing device 10 by executing the operations of the information processing device 10 in accordance with the program.

[0025] The program can be stored on a non-transitory computer-readable medium. Examples of non-transitory computer-readable media include flash memory, magnetic recording devices, optical disks, magneto-optical recording media, and ROMs. The program can be distributed by selling, transferring, or lending portable media such as SD cards, DVDs, or CD-ROMs that store the program. "SD" is an abbreviation for Secure Digital. "DVD" is an abbreviation for digital versatile disc. "CD-ROM" is an abbreviation for compact disc read only memory. The program can also be distributed by storing it in the storage of a server and transferring it from the server to another computer. The program can also be provided as a program product.

[0026] A computer temporarily stores a program stored on a portable medium or transferred from a server in its main storage device. The computer then reads the program stored in the main storage device using a processor and executes processing in accordance with the read program. The computer may also read the program directly from a portable medium and execute processing in accordance with the program. The computer may also execute processing in accordance with the received program each time a program is transferred from a server to the computer. Processing may also be executed through a so-called ASP-type service that achieves its functions by issuing execution instructions and obtaining results without transferring the program from the server to the computer. "ASP" is an abbreviation for application service provider. A program is information used for processing by a computer and includes something equivalent to a program. For example, data that is not a direct instruction to a computer but has properties that specify computer processing falls under the category of "something equivalent to a program."

[0027] Some or all of the functions of the information processing device 10 may be realized by a programmable circuit or a dedicated circuit as the control unit 11. In other words, some or all of the functions of the information processing device 10 may be realized by hardware.

[0028] Next, the operation of the information processing device 10 according to this embodiment will be described with reference to FIGS.

[0029] In step S101 of FIG. 3, the control unit 11 of the information processing device 10 acquires deterioration information indicating the degree of deterioration of the primary lining of the tunnel. Specifically, the degree of deterioration of the primary lining is the corrosion depth from the surface of the steel segment. Any method may be adopted to acquire the deterioration information. The control unit 11 may accept user input of the deterioration information via the input unit 14. The control unit 11 may read the deterioration information from the memory unit 12.

[0030] When the installation period of the target structure is input, the control unit 11 may acquire deterioration information using an estimation model that estimates the degree of deterioration of the primary lining of the target structure. The control unit 11 may acquire the estimation model by reading it from the storage unit 12. The control unit 11 may receive the estimation model from an external server device via the communication unit 13.

[0031] The estimation model may be generated by any method. For example, the estimation model may be generated by dividing inspection information indicating the installation period of the inspected structure and the degree of deterioration of the structure's primary lining into groups based on attributes of the underground environment, and then applying any linear or nonlinear regression method to the data on the installation period and degree of deterioration for each group. Specifically, the degree of deterioration is the corrosion depth from the surface of the steel segments of the inspected structure. The installation period may be measured in any unit, such as years, months, or days. An attribute of the underground environment is, for example, the earth resistivity at the location where the structure is buried. The lower the earth resistivity, the greater the impact on the deterioration of the steel segments. This estimation model can accurately estimate the degree of deterioration of the primary lining of the target structure at any time in the present or future, based on the attributes of the underground environment. The control unit 11 acquires underground environment information indicating the attributes of the tunnel's underground environment and selects an estimation model related to the attributes indicated by the information. The control unit 11 further acquires installation period information indicating the installation period of the tunnel and inputs the installation period into the selected estimation model. The control unit 11 may read the underground environment information and the installation period information from the storage unit 12, or may accept user input of the underground environment information and the installation period information via the input unit 14. The control unit 11 acquires, as deterioration information, information indicating the corrosion depth of the steel segments as the degree of deterioration estimated by the estimation model.

[0032] In step S102, the control unit 11 generates a structural model representing the tunnel, reflecting the degree of deterioration indicated by the deterioration information. The control unit 11 acquires information indicating various parameters such as the dimensions of the tunnel, and generates a structural model reflecting the parameters. The control unit 11 may read the information from the storage unit 12, or may accept user input of the information via the input unit 14. The control unit 11 generates a structural model in which the thickness of the primary lining is thinner as the degree of deterioration indicated by the deterioration information increases.

[0033] The control unit 11 may generate a structural model that reflects changes in corrosion depth estimated by the estimation model at predetermined time intervals. The predetermined time interval may be, for example, one year, but is not limited to this. For example, the control unit 11 may input, for one tunnel, the installation period, shifted by one year, for 12 years from 2025 to 2037, into the estimation model. The control unit 11 may acquire deterioration information indicating the first to twelfth corrosion depths, which are the corrosion depths of the primary lining for 12 years estimated by the estimation model, and generate, for the tunnel, first to twelfth structural models that reflect the first to twelfth corrosion depths, respectively.

[0034] FIG. 4 shows a structural model M of a tunnel generated by the control unit 11. A primary beam element B1 representing the primary lining and a secondary beam element B2 representing the secondary lining are connected to each other by a plurality of connecting spring elements SP that transmit the response of the primary lining and the secondary lining to loads in the structural analysis. In FIG. 4, eight connecting spring elements SP are provided at equal intervals, but the number and positions of the connecting spring elements SP are not limited to this. The control unit 11 may generate a structural model M in which the distance L corresponding to the thickness of the primary lining is shorter as the degree of deterioration is greater. In this way, the control unit 11 includes thinner elements in the structural model as elements representing the primary lining as the degree of deterioration of the primary lining is greater.

[0035] The control unit 11 may receive input of various parameters related to the steel segments and generate a structural model based on the various parameters. The parameters include, for example, values ​​indicating the shape, thickness, or number of any of the main girders, joint plates, longitudinal ribs, and skin plates provided in the steel segment. FIG. 5 shows the structure of one steel segment S. The steel segment S in FIG. 5 includes a main girder F, which is a load-bearing member, a skin plate PL for preventing the inflow of groundwater, etc., and multiple longitudinal ribs RB extending in the width direction of the steel segment S.

[0036] The control unit 11 may generate a structural model M including multiple primary beam elements B1 and multiple secondary beam elements B2 aligned along the axial direction of the tunnel. FIG. 6A shows a tunnel T without the secondary lining, and FIG. 6B shows a structural model M of the tunnel T without the connecting spring elements SP. In the tunnel T of FIG. 6A, multiple segment rings R1 to R3, each consisting of steel segments connected continuously in the circumferential direction, are further connected in the axial direction. The segment rings R1 to R3 are connected to each other with a predetermined angle offset in the circumferential direction. The structural model M of FIG. 6B includes a primary beam element B11 and a secondary beam element B21 corresponding to the segment ring R1, a primary beam element B12 and a secondary beam element B22 corresponding to the segment ring R2, and a primary beam element B13 and a secondary beam element B23 corresponding to the segment ring R3, aligned along the axial direction of the tunnel.

[0037] 3, the control unit 11 performs a structural analysis on the generated structural model. Any structural analysis software may be used for the structural analysis. For example, MOLEMAN (registered trademark) may be used as the structural analysis software.

[0038] The control unit 11 sets various parameters for each of the multiple tunnels in response to requests from the structural analysis software. The parameters include physical properties such as material strength of each element of the structural model, and specifications of the underground environment in which the tunnel is installed. The specifications of the underground environment may include earth pressure, water pressure, or subgrade reaction. Specifically, the specifications of the underground environment may include the subgrade reaction coefficient, soil cover, unit volume weight of soil, unit volume weight of water, tunnel excavation radius, surcharge load, internal friction angle of soil, or soil cohesion. The control unit 11 may read the setting values ​​of each parameter from the memory unit 12, or may receive user input of the setting values ​​of each parameter via the input unit 14.

[0039] In the structural analysis, the control unit 11 may calculate, for example, a crack initiation bending moment at which cracks occur in the concrete of the secondary lining. To calculate the crack initiation bending moment, the control unit 11 first obtains the tensile strength of the concrete using the following equation 1. f' in equation 1ck is the concrete strength (k / mm 2 ) and may be set as a parameter. The control unit 11 calculates the section modulus of concrete per segment ring using the following formula 2. In formula 2, h indicates the thickness (m) of the concrete, and b indicates the width (m). For example, when the thickness h of the concrete is 0.2968 (m) and the width b is 0.9 (m), the section modulus Z is 0.01321 (m 3 ) The width b of the concrete may be the same as the width of the steel segment covering the concrete. The control unit 11 further calculates the concrete crack initiation bending moment per segment ring using the following equation 3. f tk =0.23×f' ck 2 / 3 (kN / m 2 ) (Formula 1) Z=b×h 2 / 6(m 3 ) (Formula 2) M=f tk Z(kN m) (Equation 3)

[0040] The control unit 11 sets the load to be applied to the structural model. The loads acting on the structural model include the weight of the primary lining, the weight of the secondary lining, vertical loads from above or below, and horizontal loads acting from multiple vertical height positions. The control unit 11 repeatedly calculates and evaluates whether the bending moment generated by the load transmitted from the primary lining to the secondary lining, which changes as corrosion of the primary lining progresses, exceeds the crack initiation bending moment. The control unit 11 calculates the point in time when the bending moment generated in the secondary lining exceeds the crack initiation bending moment.

[0041] The control unit 11 may perform structural analysis by sequentially applying loads to multiple structural models that reflect the change in corrosion depth over time estimated by the estimation model at predetermined time intervals. As the thickness of the primary lining decreases, the centroid distance in the tunnel cross section becomes shorter. The shorter the centroid distance, the greater the load transmitted from the primary lining to the secondary lining. As the load increases, the bending moment generated in the concrete secondary lining increases, approaching the crack initiation bending moment. According to the structural analysis of this embodiment, it is possible to calculate the point in time when the bending moment exceeds the crack initiation moment, taking into account various parameters of the tunnel and underground environment.

[0042] When the control unit 11 generates a structural model including a plurality of primary beam elements, secondary beam elements, and connection spring elements corresponding to a plurality of segment rings, the control unit 11 may perform a structural analysis for each of the segment rings.

[0043] The control unit 11 may perform structural analysis by taking into account the reduction in the cross-sectional area of ​​the main girders of the steel segments in addition to the thinning of the skin plates of the steel segments as the primary lining. In this case, the structural model generated in S102 includes elements representing the steel segments, and the attribute values ​​of the elements include the cross-sectional areas of the skin plates and main girders. The control unit 11 sets a smaller cross-sectional area for the greater degree of deterioration of the primary lining. Specifically, the control unit 11 calculates the reduction in the cross-sectional area of ​​the skin plates over time using a value obtained by subtracting the corrosion depth calculated by the estimation model. The control unit 11 further acquires a predetermined main girder estimation model that estimates the reduction in the thickness of the main girders when the installation period is input, and calculates the reduction in the cross-sectional area of ​​the main girders over time using the reduction in the thickness of the main girders calculated by the main girder estimation model. The control unit 11 may read the main girder estimation model from the storage unit 12 or receive it from an external server device. The control unit 11 may perform structural analysis by applying a load to the structural model that reflects the reduction in the cross-sectional area at predetermined time intervals. This allows the control unit 11 to perform a structural analysis that reflects the deterioration of the main girder of the primary lining and the outer skin plate.

[0044] Figure 7 is a graph showing the change over time in the bending moment generated by the load transmitted from the primary lining to the secondary lining. As can be seen from the graph, as the corrosion of the primary lining progresses over time and the primary lining becomes thinner, the load acting on the concrete secondary lining increases, and the bending moment generated in the concrete also increases.

[0045] The control unit 11 may perform structural analysis by reflecting forces acting from the underground environment on the model generated in step S102. For example, the control unit 11 performs structural analysis after setting ground spring elements that connect the underground environment in which the tunnel is buried to the structural model. In this case, the control unit 11 may set the spring constant of the ground spring using any calculation formula based on the soil quality at the time of tunnel construction or the tunnel's own weight. The control unit 11 may set the spring constant of the ground spring to a value calculated from a predetermined conditional formula on the structural analysis software.

[0046] For example, the control unit 11 adds a rotational spring element representing at least one segment joint to the primary beam element to reflect the presence of the segment joint, and then performs structural analysis. The segment joint may be represented by, for example, a rotational spring element, and the control unit 11 may set a spring constant for the rotational spring element that changes over time. The control unit 11 may set the spring constant of the rotational spring element to a value determined from a predetermined conditional expression in structural analysis software.

[0047] Figure 8A shows a cross-sectional view SD1 of the segment ring R1 of Figure 6A, and Figure 8B shows a cross-sectional view SD2 of the segment ring R2 of Figure 6A. Figure 8C shows a primary beam element B11 corresponding to the cross-sectional view SD1 of Figure 8A, and Figure 8D shows a primary beam element B12 corresponding to the cross-sectional view SD2 of Figure 8B. Secondary beam elements are omitted in Figures 8C and 8D. The primary beam element B11 of Figure 8C and the primary beam element B12 of Figure 8D comprise multiple segment joints SJ. The cross-sectional views SD1 of Figure 8A and SD2 of Figure 8B comprise a primary lining L1 and a secondary lining L2 divided at a predetermined angle, and each of the multiple fan-shaped segments constituting the divided primary lining L1 corresponds to a steel segment. Cross-sectional view SD2 shows that the segment rings R1 and R2 are tilted approximately 10° clockwise compared to SD1, and the segment rings R1 and R2 are connected with a staggered offset of approximately 10°, representing a staggered arrangement.

[0048] In addition to the primary and secondary beam elements, the control unit 11 may perform structural analysis using a ring joint model representing the ring joints connecting the segment rings. The ring joints may be represented by shear spring elements, for example, and the control unit 11 may set the spring constant of the shear spring elements as rigid connections. The control unit 11 may set the spring constant of the shear spring elements to a value calculated from a predetermined conditional equation in the structural analysis software. Figure 9 shows a ring joint model RM connecting segment rings R1 and R2 in the axial direction of the tunnel. The ring joint model RM includes multiple ring joints RJ. The arc length, which is the distance between the ring joints RJ, may be, for example, the distance between the longitudinal ribs of the steel segments, which is the range where cracks are likely to occur.

[0049] When steel segments are connected circumferentially, the magnitude of the bending moment transmitted from adjacent steel segments at their cross sections varies depending on the spring constant of the rotational spring element representing the segment joint and the spring constant of the shear spring element representing the ring joint. By reflecting the segment joint in the primary beam element and performing structural analysis using a ring joint model, the magnitude of the bending moment can be calculated numerically, enabling more accurate analysis.

[0050] In step S104 of FIG. 3 , the control unit 11 acquires analysis information indicating the results of the structural analysis. The analysis information includes time information indicating the time until cracks occur in the secondary lining. Specifically, the control unit 11 acquires, as the analysis information, time information indicating the time until the bending moment generated in the secondary lining due to the applied load exceeds the crack initiation bending moment of the secondary lining as a result of the structural analysis. The time information may also be information indicating the time itself when the bending moment generated in the secondary lining exceeds the crack initiation bending moment, i.e., the time itself when cracks occur in the primary lining. For example, suppose the control unit 11 performs structural analysis sequentially, starting with the first structural model described above that reflects an increasing degree of deterioration of the primary lining, and the bending moment generated when structural analysis of the fifth structural model is performed exceeds the crack initiation bending moment. In this case, the control unit 11 acquires, as the analysis information, time information indicating the year 2030, when the fifth corrosion depth reflected in the fifth structural model will be reached.

[0051] The analysis information may include images showing the analysis results for the structural model. The images may include, for example, deformation diagrams, bending moment diagrams, shear force diagrams, axial force diagrams, or diagrams showing inter-ring shear forces. The images included in the analysis information may, for example, be images overlaid on at least one of the primary beam element B1 and the secondary beam element B2 for each segment ring, showing the deformation or distribution of various forces. The analysis information may also include a graph showing the change in the bending moment of the secondary lining over time, as shown in FIG. 7.

[0052] 3, the control unit 11 outputs the analysis information. The control unit 11 may output the analysis information via the output unit 15, or may transmit the analysis information to the user's terminal device via the communication unit 13. Thereafter, the operation of the information processing device 10 ends.

[0053] Users who refer to the analysis information can determine when cracks will occur in the secondary lining for each tunnel. Since measures such as tunnel inspection or repair can be taken before cracks actually appear in the concrete, preventive maintenance of tunnels becomes possible. Compared to separating the steel segment and concrete material models and conducting structural analysis separately for each model, structural analysis can be performed more efficiently and in a shorter time.

[0054] The following additional notes are provided regarding the above-described embodiments.

[0055] (Additional note 1) For a structure including a primary lining and a secondary lining provided inside the primary lining, deterioration information indicating the degree of deterioration of the primary lining is acquired; an information processing device comprising: a control unit that generates a structural model representing the structure by reflecting the degree of deterioration; (Additional note 2) The information processing device described in Appendix 1, wherein the structural model includes a primary beam element representing the primary lining, a secondary beam element representing the secondary lining, and one or more spring elements connecting the primary beam element and the secondary beam element to each other. (Additional note 3) The control unit Acquire installation period information indicating an installation period of the structure; When the installation period of the target structure is input, an estimation model for estimating the degree of deterioration of the primary lining provided on the target structure is obtained; 3. The information processing device according to claim 1, wherein the installation period indicated by the installation period information is input to the estimation model, and information indicating an estimated degree of deterioration is acquired as the deterioration information. (Additional note 4) 4. The information processing device according to any one of appendixes 1 to 3, wherein the control unit includes in the structural model elements with thinner thicknesses as elements representing the primary lining, as the degree of deterioration increases. (Additional note 5) the structure includes a tunnel; 5. The information processing device according to any one of appended items 1 to 4, wherein the tunnel comprises steel segments as the primary lining and a concrete material as the secondary lining. (Additional note 6) The steel segment includes a skin plate and a main girder, The information processing device described in Appendix 5, wherein the structural model includes elements representing the steel segments and includes cross-sectional areas of the skin plates and the main girders as attribute values ​​of the elements representing the steel segments, and the control unit sets the cross-sectional areas to be smaller as the degree of deterioration increases. (Additional note 7) A program for causing a computer to function as the information processing device according to any one of claims 1 to 6. (Additional note 8) An information processing method executed by an information processing device, For a structure including a primary lining and a secondary lining provided inside the primary lining, acquiring deterioration information indicating the degree of deterioration of the primary lining; generating a structural model representing the structure, reflecting the degree of deterioration; An information processing method, including:

[0056] The present disclosure is not limited to the above-described embodiments. For example, two or more blocks shown in the block diagram may be integrated, or one block may be divided. Two or more steps shown in the flowchart may be executed in parallel or in a different order, instead of being executed in chronological order as described, depending on the processing capabilities of the device executing each step, or as needed. Other modifications are possible within the scope of the present disclosure. [Explanation of symbols]

[0057] 10. Information processing equipment 11 Control section 12 Storage section 13 Communications Department 14 Input section 15 Output section

Claims

1. For a structure including a primary lining and a secondary lining provided inside the primary lining, deterioration information indicating the degree of deterioration of the primary lining is acquired; an information processing device comprising: a control unit that generates a structural model representing the structure by reflecting the degree of deterioration;

2. The information processing device according to claim 1 , wherein the structural model includes a primary beam element representing the primary lining, a secondary beam element representing the secondary lining, and one or more spring elements connecting the primary beam element and the secondary beam element to each other.

3. The control unit Acquire installation period information indicating an installation period of the structure; When the installation period of the target structure is input, an estimation model for estimating the degree of deterioration of the primary lining provided on the target structure is obtained; The information processing apparatus according to claim 1 , wherein the installation period indicated by the installation period information is input to the estimation model, and information indicating an estimated degree of deterioration is acquired as the deterioration information.

4. The information processing device according to claim 1 , wherein the control unit includes, in the structural model, elements having a smaller thickness as the degree of deterioration increases, as the element representing the primary lining.

5. the structure includes a tunnel; The information processing device according to claim 1 , wherein the tunnel comprises steel segments as the primary lining and a concrete material as the secondary lining.

6. The steel segment includes a skin plate and a main girder, the structural model includes elements representing the steel segments, and includes cross-sectional areas of the skin plates and the main girders as attribute values ​​of the elements representing the steel segments; The information processing apparatus according to claim 5 , wherein the control unit sets the cross-sectional area to be smaller as the degree of deterioration increases.

7. A program for causing a computer to function as the information processing device according to any one of claims 1 to 6.

8. An information processing method executed by an information processing device, For a structure including a primary lining and a secondary lining provided inside the primary lining, acquiring deterioration information indicating the degree of deterioration of the primary lining; generating a structural model representing the structure, reflecting the degree of deterioration; An information processing method, including:

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