Testing device for measuring heat insulation effect of high-ground-temperature tunnel

Abstract

The invention relates to the field of test devices, in particular to a test device for measuring the heat insulation effect of a high-ground-temperature tunnel, and a basic high-ground-temperature tunnel test environment is formed by a tunnel main body, a heat insulation structure, surrounding rock, a loading pressure head and an air blowing module. Then multiple optical fiber sensors are arranged in a test environment to collect temperature values of multiple positions in the test environment, and quantitative analysis can be conducted on the heat preservation effect of the current heat insulation structure on the tunnel body in combination with the analysis method. According to the invention, the actual environment of the high-ground-temperature tunnel can be accurately simulated, and detailed temperature field and strain field data can be obtained through various monitoring means. The thermal insulation effect under different thermal insulation materials (or thermal insulation structures) and wind speed conditions can be quantitatively analyzed, and a scientific basis and an optimization scheme are provided for design and construction of the high-ground-temperature tunnel.

Description

Technical Field

[0001] The present invention relates to the field of test devices, and specifically to a test device for measuring the heat insulation effect of high geothermal tunnels. Background Art

[0002] High geothermal conditions have seriously affected the long-term stability and safety of tunnel structures, mainly manifested in the following aspects: degradation of the performance of tunnel structure materials, increased burden on the ventilation system, comfort and health of personnel, and decreased operating efficiency of equipment. In order to cope with the challenges of high geothermal tunnels, materials with excellent heat insulation performance, such as glass fiber, rock wool, polyurethane foam, etc., are currently commonly used to cover the surface or interlayer of the tunnel lining. The heat insulation layer not only plays the role of heat insulation, but the influence on the bearing capacity of the lining structure cannot be ignored. In addition, there are significant differences in the heat insulation effects of different materials, and the heat insulation performance and mechanical properties of materials may degrade under long-term high temperature conditions. The existing heat insulation structure design lacks systematic experimental verification and optimization, and it is difficult to achieve ideal results.

[0003] In order to further improve the heat insulation effect of geothermal tunnels and ensure the long-term stability of tunnel structures and the safety of personnel, it is particularly important to conduct systematic experimental research on heat insulation structures. Through test devices, the performance of heat insulation materials and structures can be accurately evaluated, heat insulation design schemes can be optimized, long-term stability can be verified, and economic costs can be reduced. Currently, there are few test devices for measuring the heat insulation effect of high geothermal tunnels. The existing test devices are difficult to accurately simulate the high temperature environment of actual tunnels, can only test single materials or structures, and it is difficult to conduct comprehensive multi-factor comparative analysis. Some test devices lack perfect temperature and wind speed control systems and stress field and temperature field data monitoring and acquisition systems, which affect the accuracy and reliability of test results. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a test device for measuring the heat insulation effect of high geothermal tunnels to solve the problems in the background art.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A test device for measuring the heat insulation effect of high geothermal tunnels of the present invention includes the following steps:

[0007] A tunnel main body, formed by a lining structure, for simulating a tunnel structure in a high geothermal environment;

[0008] A heat insulation structure, arranged outside the tunnel main body, for providing heat insulation protection for the tunnel main body;

[0009] Surrounding rock, arranged outside the heat insulation structure, for simulating the surrounding rock structure around the tunnel structure in a high geothermal environment;

[0010] The loading indenter is arranged outside the surrounding rock and is used to heat and pressurize the surrounding rock;

[0011] The blowing component is arranged at the end of the tunnel main body and is used to blow air with a target speed value into the tunnel main body according to the test requirements;

[0012] Multiple groups of fiber optic sensors are respectively arranged on the central axis of the tunnel main body, on the inner wall of the tunnel main body, and in the surrounding rock, and are used to collect the temperature of the central axis of the tunnel main body, the temperature of the inner wall of the tunnel main body, and the temperature in the surrounding rock respectively;

[0013] The analysis module is connected to the multiple groups of fiber optic sensors. When the stress and temperature applied by the loading indenter are both balanced, the heat insulation effect of the heat insulation structure on the tunnel main body is determined based on the temperature of the central axis of the tunnel main body, the temperature of the side wall of the tunnel main body, and the temperature in the surrounding rock.

[0014] In an embodiment of the present application, the test device is provided with a section passing through the tunnel main body, the heat insulation structure, and the surrounding rock, and the section coincides with the central axis of the tunnel main body;

[0015] A transparent heat transfer plate is provided on the section.

[0016] In an embodiment of the present application, it further includes:

[0017] A laser light source is used to emit laser light to the transparent heat transfer plate;

[0018] An infrared thermal imaging camera is connected to the analysis module and is used to collect the thermal imaging image of the transparent heat transfer plate irradiated by the laser;

[0019] The analysis module is further used to monitor the thermal imaging image of the transparent heat transfer plate irradiated by the laser based on digital speckle technology to obtain temperature distribution data and strain field change data.

[0020] In an embodiment of the present application, the multiple groups of fiber optic sensors are respectively located on multiple detection sections, and the detection sections are perpendicular to the central axis of the tunnel main body; each group of fiber optic sensors includes a first fiber optic sensor located on the central axis of the tunnel main body, a second fiber optic sensor located on the upper wall of the tunnel main body, a third fiber optic sensor located on the side wall of the tunnel main body, a fourth fiber optic sensor located on the lower wall of the tunnel main body, a fifth fiber optic sensor located above the tunnel main body and in the surrounding rock, a sixth fiber optic sensor located on the side of the tunnel main body and in the surrounding rock, and a seventh fiber optic sensor located below the tunnel main body and in the surrounding rock.

[0021] In an embodiment of the present application, the heat preservation effect includes the heat insulation effect Pi of the ith detection section. i,0 The mathematical expression of the heat insulation effect Pi of the ith detection section i,0 is as follows:

[0022]

[0023] In the formula, T Si,0 is the acquisition value of the first optical fiber sensor of the ith detection section, and T Si,4 is the acquisition value of the fifth optical fiber sensor of the ith detection section, and T Si,5 is the acquisition value of the sixth optical fiber sensor of the ith detection section, and T Si,6 is the acquisition value of the seventh optical fiber sensor of the ith detection section.

[0024] In an embodiment of the present application, the heat preservation effect includes the overall heat insulation effect P0 of the heat insulation structure, and the mathematical expression of the overall heat insulation effect P0 is:

[0025]

[0026] In the formula, n is the number of detection sections.

[0027] In an embodiment of the present application, the heat preservation effect includes the crown heat insulation effect Pi of the ith detection section i,1 The mathematical expression of the crown heat insulation effect Pi i,1 is as follows:

[0028]

[0029] In the formula, T Si,1 is the acquisition value of the second optical fiber sensor of the ith detection section.

[0030] In an embodiment of the present application, the heat preservation effect includes the side wall heat insulation effect Pi of the ith detection section i,2 The mathematical expression of the side wall heat insulation effect Pi i,2 is as follows:

[0031]

[0032] In the formula, T Si,2 is the acquisition value of the third optical fiber sensor of the ith detection section.

[0033] In an embodiment of the present application, the heat preservation effect includes the invert heat insulation effect Pi of the ith detection section i,3 The mathematical expression of the invert heat insulation effect Pi i,3 is as follows:

[0034]

[0035] where T Si,3 is the acquisition value of the fourth optical fiber sensor at the i-th detection section.

[0036] In an embodiment of the present application, the heat insulation structure is a detachable structure for testing heat insulation structures of various material types.

[0037] The beneficial effects of the present invention are as follows: An experimental device for measuring the heat insulation effect of a high geothermal tunnel of the present invention constitutes a basic high geothermal tunnel test environment by a tunnel main body, a heat insulation structure, surrounding rock, a loading indenter, and a blowing module. Then, a variety of optical fiber sensors are set in the test environment to collect temperature values at multiple internal positions. Combining with the analysis method of the present application, the heat insulation effect of the current heat insulation structure on the tunnel main body can be quantitatively analyzed. The present application can accurately simulate the actual environment of a high geothermal tunnel and obtain detailed temperature field and strain field data through a variety of monitoring means. The heat insulation effects under different heat insulation materials (or heat insulation structures) and wind speed conditions are quantitatively analyzed, providing a scientific basis and optimization plan for the design and construction of high geothermal tunnels. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The present invention will be further described below in conjunction with the drawings and embodiments:

[0039] Figure 1 is a structural diagram of an experimental device for measuring the heat insulation effect of a high geothermal tunnel shown in an embodiment of the present application;

[0040] Figure 2 is an exploded view of the heat insulation structure in an embodiment of the present application;

[0041] Figure 3 is a distribution schematic diagram of the optical fiber sensors in an embodiment of the present application;

[0042] Figure 4 is a structural schematic diagram of the strain monitoring plane in an embodiment of the present application;

[0043] Figure 5 is a schematic diagram of the longitudinal temperature change curve of the tunnel in an embodiment of the present application. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0044] The following specific examples illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation manners. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0045] It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner. Therefore, only the layers related to the present invention are shown in the diagrams, rather than being drawn according to the number, shape, and size of the layers in actual implementation. The type, quantity, and proportion of each layer in actual implementation can be arbitrarily changed, and the layer layout type may also be more complex.

[0046] In the following description, a large number of details are explored to provide a more thorough explanation of the embodiments of the present invention. However, it is obvious to those skilled in the art that the embodiments of the present invention can be implemented without these specific details.

[0047] Figure 1 It is a structural diagram of a test device for measuring the heat insulation effect of a high geothermal tunnel shown in an embodiment of the present application. As Figure 1 shown: A test device for measuring the heat insulation effect of a high geothermal tunnel in this embodiment includes a tunnel main body 1, a heat insulation structure 2, surrounding rock 3, a loading indenter 4, a blowing assembly 5, multiple groups of optical fiber sensors 6, and an analysis module, which are specifically introduced as follows:

[0048] The tunnel main body 1 is formed by a lining structure and is used to simulate the tunnel structure in a high geothermal environment; the lining structure is attached to the heat insulation structure to simulate the composite support structure in an actual tunnel project. The lining material has a certain strength to ensure its stability under pressure and high temperature environments.

[0049] The heat insulation structure 2 is arranged outside the tunnel main body 1 and is used to provide heat insulation protection for the tunnel main body 1;

[0050] Figure 2 It is an exploded view of the heat insulation structure in an embodiment of the present application. As Figure 2 shown, the heat insulation structure 2 is a detachable structure for testing heat insulation structures of various material types. The heat insulation structure is located between the surrounding rock and the lining structure and is specifically an empty shell made of a heat transfer material. It can be withdrawn from the model longitudinally along the tunnel before the test loading for filling with heat insulation materials or heat insulation structures and is placed between the surrounding rock and the lining structure before loading. The types of heat insulation materials include, but are not limited to, ceramic fibers, aerogels, foam plastics, etc. By replacing different heat insulation materials, the heat insulation effect on high geothermal tunnels can be analyzed.

[0051] The surrounding rock 3 is arranged outside the heat insulation structure 2 and is used to simulate the surrounding rock structure around the tunnel structure in a high geothermal environment;

[0052] To facilitate the monitoring of the evolution laws of the surrounding rock stress field and temperature field under the action of external forces and temperature, the test model selects half of the longitudinal symmetry plane of the tunnel. The surrounding rock part includes both the unexcavated part in front of the tunnel face and the unexcavated part, so as to be able to analyze the variation laws and disturbance ranges of the temperature field and stress field before and after excavation, support, and heat insulation measures. The surrounding rock directly bears the pressure and temperature applied by the loading indenter. Multiple channels are designed inside the surrounding rock to facilitate the arrangement of fiber optic sensors and transparent heat transfer plates.

[0053] The loading indenter 4 is arranged outside the surrounding rock 3 and is used to heat and pressurize the surrounding rock 3;

[0054] The loading indenter is located around the device (except for the observation plane). In addition to having the loading function, it also has a heating function and can simulate the in-situ stress state and high geothermal environment. The heating element of the loading indenter uses high-efficiency electric heating wires, and the heating temperature can be precisely adjusted through the control system, with a range from room temperature to 200 °C.

[0055] The blowing assembly 5 is arranged at the end of the tunnel main body 1 and is used to blow air with a target speed value into the tunnel main body 1 according to the test requirements; the blowing assembly 5 is internally provided with a wind speed control device, and the wind speed control device is located at the end of the lining. The environmental wind speed during the construction process is simulated through the fan and the control system. The wind speed control device can adjust the wind speed to simulate the heat insulation effect under different construction environments.

[0056] Multiple groups of fiber optic sensors 6 are respectively arranged on the central axis of the tunnel main body 1, the inner wall of the tunnel main body 1, and inside the surrounding rock 3, and are used to collect the temperature on the central axis of the tunnel main body 1, the temperature on the inner wall of the tunnel main body 1, and the temperature inside the surrounding rock 3 respectively;

[0057] The fiber optic sensors are distributed at multiple positions along the longitudinal perimeter of the tunnel, and the changes in the temperature field are monitored through fiber Bragg grating technology. The arrangement density of the fiber optic sensors is set according to the test requirements to ensure that the small changes in the temperature field and the temperature distribution before and after the tunnel face can be captured.

[0058] Figure 3 This is a distribution schematic diagram of the fiber optic sensors in an embodiment of the present application. As Figure 3 shown, multiple groups of fiber optic sensors 6 are respectively located on multiple detection cross-sections. In this embodiment, they are the S1 - S9 detection cross-sections. The detection cross-sections are perpendicular to the central axis of the tunnel main body 1;

[0059] Taking the S3 detection cross-section as an example, each group of fiber optic sensors 6 includes:

[0060] The first fiber optic sensor T located on the central axis of the tunnel main body 1 S3,0 ;

[0061] The second optical fiber sensor T located on the upper wall of the tunnel main body 1 S3,1 ;

[0062] The third optical fiber sensor T located on the side wall of the tunnel main body 1 S3,2 ;

[0063] The fourth optical fiber sensor T located on the lower wall of the tunnel main body 1 S3,3 ;

[0064] The fifth optical fiber sensor T located above the tunnel main body 1 and within the surrounding rock 3 S3,4 ;

[0065] The sixth optical fiber sensor T located on the side of the tunnel main body 1 and within the surrounding rock 3 S3,5 ;

[0066] The seventh optical fiber sensor T located below the tunnel main body 1 and within the surrounding rock 3 S3,6 .

[0067] An analysis module, connected to the multiple groups of optical fiber sensors 6, when the stress and temperature applied by the loading indenter 4 are both balanced, determines the heat insulation effect of the heat insulation structure 2 on the tunnel main body 1 based on the temperature of the central axis of the tunnel main body 1, the temperature of the side wall of the tunnel main body 1, and the temperature within the surrounding rock 3.

[0068] In addition, the test device is provided with a cross-section passing through the tunnel main body 1, the heat insulation structure 2, and the surrounding rock 3, and the cross-section coincides with the central axis of the tunnel main body 1; a transparent heat transfer plate 7 is provided on the cross-section. Figure 4 This is a schematic structural diagram of the strain monitoring plane in an embodiment of the present application, as Figure 4 shown. In this embodiment, the cross-section serves as the strain monitoring plane.

[0069] The transparent heat transfer plate is fixed on the side wall of the device and is made of a material with high transparency and good heat conduction performance, such as quartz glass. The transparent heat transfer plate enables the temperature field and stress field at the cross-section position to be monitored through infrared thermal imaging and digital speckle techniques, and the temperature distribution and strain field change data of the monitoring plane are obtained.

[0070] In order to monitor the strain monitoring plane, the present application also provides:

[0071] A laser light source for emitting laser light towards the transparent heat transfer plate;

[0072] An infrared thermal imaging camera 8, connected to the analysis module, for collecting the thermal imaging image of the transparent heat transfer plate 7 irradiated by the laser;

[0073] The analysis module is also used to monitor the thermal imaging image of the transparent heat transfer plate 7 irradiated by the laser based on digital speckle technology, and obtain temperature distribution data and strain field change data.

[0074] Among them, digital speckle pattern interferometry (DSPI for short) is a non-contact optical measurement method, which is widely used in the precise measurement of physical quantities such as deformation, displacement and strain. This technology is based on the laser speckle effect, and realizes the measurement of the displacement field or deformation field on the object surface by recording and analyzing the change of the speckle pattern caused by the deformation on the object surface.

[0075] In digital speckle technology, first use a laser to irradiate the surface of the object to be measured. Due to the microscopic unevenness of the object surface, the laser will form a randomly distributed speckle pattern. When the object undergoes a small deformation, these speckle patterns will also change accordingly. By capturing the speckle images before and after deformation with a CCD or other types of cameras, and using a computer to process and analyze these images, the displacement information or deformation distribution of the object surface can be obtained.

[0076] Digital speckle technology has the advantages of high precision, high resolution, non-contact measurement, etc., and is suitable for the research of various materials and non-destructive testing in engineering applications. In addition, with the development of computer technology and image processing algorithms, the application scope of digital speckle technology is constantly expanding, and it has become one of the important tools in the fields of scientific research and industrial inspection.

[0077] Based on the above test device, the test method of this application is as follows:

[0078] ① Device assembly

[0079] First, assemble the surrounding rock and lining structure according to the design drawings. Then, fill the hollow shell of the heat insulation structure with heat insulation materials or the heat insulation structure, and place it inside the surrounding rock. Next, install the fiber optic sensor and the transparent heat transfer plate to ensure their accurate positions. Finally, install the loading indenter and the wind speed control device, and conduct system debugging.

[0080] ② Loading and monitoring

[0081] Start the pressurization and heating functions of the loading indenter, and set the required loading pressure and temperature according to the test requirements. After the stress state is balanced, adjust the heating temperature in real time through the control system. At the same time, start the wind speed control device and set the required wind speed. The fiber optic sensor and the high-performance camera collect and record the image data for temperature field and stress field analysis in real time, and conduct temperature field and strain field analysis through the data processing system.

[0082] ③ Data analysis

[0083] During the test, the monitoring data of the fiber optic sensors and high-performance cameras were obtained through the data acquisition system. Infrared thermal imaging and digital speckle technology were used to analyze the temperature field and strain field at the monitoring profile position.

[0084] As Figure 4 shown, combined with the test requirements, multiple monitoring sections S1 to Si were arranged longitudinally along the tunnel. In this example, i = 9 was selected, and T Si,0 to T Si,6 7 monitoring points were arranged at each monitoring section, and fiber optic sensors were used to monitor the temperature at the positions of each monitoring point. By comparing the monitoring results of the fiber optic temperature sensors on the inner and outer sides of the tunnel lining structure, the heat insulation effects of the heat insulation structures at the positions of the tunnel interior, arch top, arch bottom, and side walls were obtained. The specific calculation process is as follows:

[0085] The heat insulation effect includes the heat insulation effect Pi of the i-th detection section i,0 , and the mathematical expression of the heat insulation effect Pi of the i-th detection section i,0 is:

[0086]

[0087] In the formula, T Si,0 is the acquisition value of the first fiber optic sensor of the i-th detection section, T Si,4 is the acquisition value of the fifth fiber optic sensor of the i-th detection section, T Si,5 is the acquisition value of the sixth fiber optic sensor of the i-th detection section, T Si,6 is the acquisition value of the seventh fiber optic sensor of the i-th detection section.

[0088] The heat insulation effect includes the overall heat insulation effect P0 of the heat insulation structure 2, and the mathematical expression of the overall heat insulation effect P0 is:

[0089]

[0090] In the formula, n is the number of detection sections.

[0091] The heat insulation effect includes the arch top heat insulation effect Pi of the i-th detection section i,1 , and the mathematical expression of the arch top heat insulation effect Pi i,1 is:

[0092]

[0093] In the formula, T Si,1 is the acquisition value of the second fiber optic sensor of the i-th detection section.

[0094] The heat insulation effect includes the side wall heat insulation effect Pi of the i-th detection section i,2 , and the side wall heat insulation effect Pii,2 The mathematical expression is as follows:

[0095]

[0096] In the formula, T Si,2 is the acquisition value of the third optical fiber sensor at the i-th detection section.

[0097] The heat preservation effect includes the arch bottom heat insulation effect P at the i-th detection section i,3 and the arch bottom heat insulation effect P i,3 The mathematical expression is as follows:

[0098]

[0099] In the formula, T Si,3 is the acquisition value of the fourth optical fiber sensor at the i-th detection section.

[0100] Finally, the present application can reasonably optimize the heat insulation structure by combining the heat insulation effects at different positions.

[0101] To further optimize the safety environmental distance under the action of the heat insulation structure, the temperature inside the tunnel is measured as T by using an optical fiber sensor Si,0 , Figure 5 is a schematic diagram of the longitudinal temperature change curve of the tunnel in an embodiment of the present application. The longitudinal temperature change curve of the tunnel is drawn as Figure 5 shown, and it is mathematically fitted, and the fitted curve is corrected by combining the infrared thermal imaging monitoring results. The tunnel construction environment temperature T0 is obtained by referring to relevant specifications, and the high geothermal influence range dp under the action of the heat insulation structure is determined based on the fitted curve and the face distance. According to the data under different heat insulation materials and wind speed conditions, the influence effects of various heat insulation structures on the high geothermal influence range of high geothermal tunnels are evaluated.

[0102] The temperature field and strain field at the position of the transparent heat transfer plate are monitored by infrared thermal imaging and digital speckle technology, so as to analyze the action effects and failure laws of the tunnel support system (lining structure + heat insulation structure) under different temperatures and pressures, and then guide the design optimization of the tunnel heat insulation structure.

[0103] An experimental device for measuring the heat insulation effect of high geothermal tunnels according to the present invention forms a basic high geothermal tunnel test environment with a tunnel main body, a heat insulation structure, surrounding rock, a loading indenter, and a blowing module. Then, a variety of optical fiber sensors are set in the test environment to collect temperature values at multiple internal positions. Combining with the analysis method of the present application, the heat preservation effect of the current heat insulation structure on the tunnel main body can be quantitatively analyzed. The present application can accurately simulate the actual environment of high geothermal tunnels and obtain detailed temperature field and strain field data through a variety of monitoring means. The heat insulation effects under different heat insulation materials (or heat insulation structures) and wind speed conditions are quantitatively analyzed, providing a scientific basis and optimization plan for the design and construction of high geothermal tunnels.

[0104] This embodiment also provides a computer-readable storage medium, on which a computer program is stored. When the program is executed by a processor, it implements any one of the methods in this embodiment, where the method is the execution logic of this system.

[0105] This embodiment also provides an electronic terminal, including: a processor and a memory;

[0106] The memory is used to store a computer program, and the processor is used to execute the computer program stored in the memory so that the terminal executes any one of the methods in this embodiment.

[0107] For the computer-readable storage medium in this embodiment, those of ordinary skill in the art can understand that all or part of the steps of implementing the above method embodiments can be completed by hardware related to the computer program. The foregoing computer program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps including the above method embodiments; and the foregoing storage medium includes: various media such as ROM, RAM, magnetic disk, or optical disk that can store program codes.

[0108] The electronic terminal provided in this embodiment includes a processor, a memory, a transceiver, and a communication interface. The memory and the communication interface are connected to the processor and the transceiver and complete communication with each other. The memory is used to store a computer program, the communication interface is used for communication, and the processor and the transceiver are used to run the computer program so that the electronic terminal executes each step of the above method.

[0109] In this embodiment, the memory may include a random access memory (Random Access Memory, abbreviated as RAM), and may also include a non-volatile memory, such as at least one disk memory.

[0110] The above-mentioned processor may be a general-purpose processor, including a Central Processing Unit (CPU for short), a Network Processor (NP for short), etc.; it may also be a Digital Signal Processor (DSP for short), an Application Specific Integrated Circuit (ASIC for short), a Field-Programmable Gate Array (FPGA for short), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components.

[0111] In the above embodiments, although the present invention has been described in conjunction with specific embodiments of the present invention, many substitutions, modifications, and variations of these embodiments will be apparent to those of ordinary skill in the art based on the foregoing description. The embodiments of the present invention are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims.

[0112] The above embodiments are only illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A test device for measuring the thermal insulation effect of a high ground temperature tunnel, characterized in that: include: The tunnel body (1) is formed by a lining structure and is used to simulate a tunnel structure in a high ground temperature environment; A heat insulation structure (2) is arranged outside the tunnel body (1) and is used to provide heat insulation protection for the tunnel body (1); Surrounding rock (3), arranged outside the thermal insulation structure (2), and used to simulate the surrounding rock structure around the tunnel structure in a high ground temperature environment; A loading pressure head (4) is arranged outside the surrounding rock (3) and is used to heat and pressurize the surrounding rock (3); A blowing assembly (5) is arranged at the end of the tunnel body (1) and is used to blow an airflow of a target velocity value into the tunnel body (1) according to test requirements; A plurality of groups of optical fiber sensors (6) are respectively arranged on the central axis of the tunnel body (1), the inner wall of the tunnel body (1) and the surrounding rock (3), and are used to respectively collect the temperature of the central axis of the tunnel body (1), the temperature of the inner wall of the tunnel body (1) and the temperature in the surrounding rock (3); An analysis module is connected to the plurality of groups of optical fiber sensors (6) and measures the heat preservation effect of the heat insulation structure (2) on the tunnel body (1) based on the temperature of the central axis of the tunnel body (1), the temperature of the side wall of the tunnel body (1) and the temperature in the surrounding rock (3) when the stress and temperature applied by the loading pressure head (4) are balanced.

2. A high ground temperature tunnel insulation effect test device according to claim 1, characterized in that: The test device is provided with a cross section that passes through the tunnel body (1), the heat insulation structure (2) and the surrounding rock (3), and the cross section coincides with the central axis of the tunnel body (1); A transparent heat transfer plate (7) is provided on the cross section.

3. A high ground temperature tunnel insulation effect test device according to claim 2, characterized in that: Also includes: A laser light source, used for emitting laser light toward the transparent heat transfer plate; An infrared thermal imaging camera (8), connected to the analysis module, and used to collect a thermal imaging image of the transparent heat transfer plate (7) irradiated by the laser; The analysis module is also used to monitor the thermal imaging image of the transparent heat transfer plate (7) irradiated by the laser based on the digital speckle technology to obtain temperature distribution data and strain field change data.

4. A high ground temperature tunnel insulation effect test device according to claim 1, characterized in that: The multiple groups of optical fiber sensors (6) are respectively located on multiple detection sections, and the detection sections are perpendicular to the central axis of the tunnel body (1); each group of optical fiber sensors (6) comprises a first optical fiber sensor located on the central axis of the tunnel body (1), a second optical fiber sensor located on the upper wall of the tunnel body (1), a third optical fiber sensor located on the side wall of the tunnel body (1), a fourth optical fiber sensor located on the lower wall of the tunnel body (1), a fifth optical fiber sensor located above the tunnel body (1) and in the surrounding rock (3), a sixth optical fiber sensor located on the side of the tunnel body (1) and in the surrounding rock (3), and a seventh optical fiber sensor located below the tunnel body (1) and in the surrounding rock (3).

5. A high ground temperature tunnel insulation effect test device according to claim 4, characterized in that: The thermal insulation effect includes the thermal insulation effect P of the i-th detection section i,0 , the thermal insulation effect P of the i-th detection section i,0 The mathematical expression is: Where, T Si,0 is the collected value of the first optical fiber sensor of the i-th detection section, T Si,4 is the collected value of the fifth optical fiber sensor of the i-th detection section, T Si,5 is the collected value of the sixth optical fiber sensor of the i-th detection section, T Si,6 is the collected value of the seventh optical fiber sensor of the i-th detection section.

6. A high ground temperature tunnel insulation effect test device according to claim 5, characterized in that: The thermal insulation effect includes the overall thermal insulation effect P0 of the thermal insulation structure (2), and the mathematical expression of the overall thermal insulation effect P0 is: Where n is the number of inspection sections.

7. A high ground temperature tunnel insulation effect test device according to claim 4, characterized in that: The thermal insulation effect includes the thermal insulation effect P of the vault of the i-th detection section. i,1 , the vault insulation effect P i,1 The mathematical expression is: Where, T Si,1 is the collected value of the second optical fiber sensor of the i-th detection section.

8. A high ground temperature tunnel insulation effect test device according to claim 4, characterized in that: The thermal insulation effect includes the side wall thermal insulation effect P of the i-th detection section i,2 , the side wall insulation effect P i,2 The mathematical expression is: Where, T Si,2 is the collected value of the third optical fiber sensor of the i-th detection section.

9. A high ground temperature tunnel insulation effect test device according to claim 4, characterized in that: The thermal insulation effect includes the thermal insulation effect P of the arch bottom of the i-th detection section. i,3 , the arch bottom insulation effect P i,3 The mathematical expression is: Where, T Si,3 is the collected value of the fourth optical fiber sensor of the i-th detection section.

10. A high ground temperature tunnel insulation effect test device according to claim 1, characterized in that: The thermal insulation structure (2) is a detachable structure, and is used for testing thermal insulation structures made of various materials.

Images