Tunnel high-temperature environment simulation and temperature field perception monitoring model system and method

Abstract

The application provides a tunnel high-geothermal-temperature environment simulation and temperature field sensing monitoring model system and method, which comprises a model main body, a model boundary control system, a hole-internal temperature control system and a temperature field data acquisition and monitoring system. The model main body comprises a tunnel surrounding rock model, a simulated tunnel cavity and a high-temperature heat source structure. The high-temperature heat source structure is arranged in the tunnel surrounding rock model and comprises simulated water-bearing layer heat sources and water-bearing fissure fault heat sources. The model boundary control system is used for conditionally controlling various temperature boundaries of the model main body. The hole-internal temperature control system is arranged at the top of the simulated tunnel cavity and is used for controlling the temperature inside the tunnel cavity. The temperature field data acquisition and monitoring system detects the temperature changes of the side walls, the tunnel face and the internal positions of the model main body. The application can reveal the high-geothermal-temperature tunnel temperature field distribution law and realize accurate detection and positioning of the abnormal high-temperature heat source in front of the tunnel.

Description

Technical Field

[0001] This invention belongs to the field of tunnel simulation technology, and relates to a tunnel high geothermal environment simulation and temperature field sensing and monitoring model system and method. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] As railway transportation extends into mountainous areas with difficult terrain and complex geology, tunnel engineering is developing towards deeper and longer tunnels, traversing more complex geological units. The Qinghai-Tibet Plateau region, in particular, is located in the collision zone of the Indian and Eurasian plates, characterized by complex geological structures, numerous suture zones and faults, and hot spring outcrops. Abnormally active Cenozoic magmatic and hydrothermal activity easily generates localized abnormally high heat sources. Under the combined influence of significant geothermal anomalies and deep burial, tunnel construction often faces the threat of high geothermal hazards, encountering high rock temperatures and high-temperature water damage, making tunnel construction face even more severe safety issues. For example, harsh conditions such as high temperature and humidity will worsen the tunnel construction environment, making it impossible for construction workers to work normally. Low strength and poor durability of tunnel lining structures and building materials pose a significant threat to the safety of the tunnel structure, and in severe cases, may even deteriorate the normal operating environment of the tunnel, affecting its normal use. Furthermore, under the coupled effects of high temperature, high pressure, and other complex geological conditions, when tunnels pass through areas with abnormally active hydrothermal activity, the presence of unknown high-temperature hot water in these areas may lead to extremely serious sudden water inrush accidents. Therefore, accurately locating abnormally high-temperature heat sources in front of the tunnel is a crucial step in ensuring safe tunnel construction.

[0004] Currently, in the field of tunnel early warning technology, the use of temperature field methods to detect, locate, and target images of abnormally high-temperature heat sources ahead of tunnels is still lacking. Early detection of abnormally high-temperature heat sources remains a pressing problem to be solved in tunnel construction both domestically and internationally. Investigating the geological origins of abnormally high-temperature heat sources, studying the spatiotemporal distribution patterns of geothermal fields in typical high-temperature heat source structures within tunnels, and proposing a three-dimensional geothermal field observation system are prerequisites for accurate detection and imaging of abnormally high-temperature heat sources. However, current research is only at the numerical simulation stage, and numerical simulation alone is insufficient to accurately simulate complex actual geological environments, thus hindering the revelation of important phenomena and patterns. Summary of the Invention

[0005] To address the aforementioned problems, this invention proposes a simulation and temperature field sensing monitoring model system and method for high geothermal environment in tunnels. This invention can reveal the temperature field distribution law of high geothermal tunnels and achieve accurate detection and location of abnormal high-temperature heat sources in front of the tunnel.

[0006] According to some embodiments, the present invention adopts the following technical solution:

[0007] A tunnel high-geothermal environment simulation and temperature field sensing and monitoring model system includes a model body, a model boundary control system, a tunnel internal temperature control system, and a temperature field data acquisition and monitoring system, wherein:

[0008] The main body of the model includes a tunnel surrounding rock model, a simulated tunnel cavity, and a high-temperature heat source structure. The high-temperature heat source structure is set vertically inside the tunnel surrounding rock model, including a simulated water-bearing layered heat source and a water-bearing fracture fault heat source. The simulated tunnel cavity is set horizontally inside the tunnel surrounding rock model.

[0009] The model boundary control system includes a constant temperature liquid bath device, an electric heating film, and a heat insulation layer. The constant temperature liquid bath device is connected to a constant temperature water layer laid on the upper boundary of the model body. The electric heating film is laid on the lower boundary of the model body. The heat insulation layer is set on the four sides of the model body to control the temperature boundaries of the model body.

[0010] The tunnel temperature control system is installed at the top of the simulated tunnel cavity to control the temperature inside the tunnel cavity.

[0011] The temperature field data acquisition and monitoring system includes several temperature acquisition devices distributed on the sidewalls, working face, and inside the model body to detect temperature changes at corresponding locations within the model body.

[0012] As an alternative implementation, the model body is prepared from a similar material. The similar material is selected to have the same or similar thermal conductivity, thermal diffusivity, and other temperature field geophysical parameters as the surrounding rock to be simulated.

[0013] As an alternative implementation, the aquifer layered heat source is a three-layer geological model, consisting of a soil layer, an aquifer, and a rock layer from top to bottom. Thermocouples are evenly arranged in the aquifer and connected to a computer. An inlet pipe and an outlet pipe are arranged in the lower part of the aquifer, and the other end of the inlet pipe is connected to a water tank.

[0014] As an alternative implementation, the water-bearing fracture fault heat source includes prefabricated fractured rock mass simulation material, an inlet pipe, and an outlet pipe. The outlet pipe is arranged at the lower end of the water-bearing fracture fault heat source structure, and the inlet pipe is arranged at the upper end of the water-bearing fracture fault heat source structure. The other end of the inlet pipe is connected to a water tank.

[0015] As an alternative implementation, in the water-bearing fracture fault heat source structure, the prefabricated fractured rock mass simulation material contains vertically connected fractures or fissures to simulate deep and large fractures in actual geology.

[0016] As an alternative implementation, the constant temperature water layer is connected to the constant temperature liquid bath device through an inlet pipe and a return pipe.

[0017] As an alternative implementation, the tunnel temperature control system includes a constant temperature and humidity machine, a variable frequency fan, and ventilation ducts. The variable frequency fan is arranged at the top of the simulated tunnel cavity at a certain distance from the working face, and the variable frequency fan is connected to the constant temperature and humidity machine outside the model body through the ventilation ducts.

[0018] As an alternative implementation, the temperature acquisition device includes a temperature field acquisition device and a pre-embedded sensor temperature monitoring device. The temperature field acquisition device is a temperature sensor or a fiber optic temperature measuring line, including multiple devices, which are respectively installed in the sidewalls, working face and pre-drilled holes of the tunnel model. The pre-embedded sensor temperature monitoring device includes temperature sensors that are pre-embedded in the main body of the model and are evenly distributed.

[0019] As a further step, the temperature acquisition device arranged at the tunnel face is a temperature sensor array arranged at the tunnel face; distributed optical fiber temperature measuring lines are arranged on the tunnel sidewalls and arch, with the measuring lines arranged in the same direction as the tunnel longitudinal direction; and optical fiber temperature measuring lines are arranged in the advance boreholes at the tunnel face.

[0020] A method for operating the above system includes the following steps:

[0021] After determining the type and structure of the high-temperature heat source, the geological body of the high-temperature heat source model is cast in the reserved space of the model.

[0022] Determine the temperature field test parameters and set up the equipment;

[0023] Start the constant temperature liquid bath device and the electric heating film device, record the temperature data monitored by the pre-embedded sensor, and after the temperature value stabilizes, start the constant temperature and humidity machine device to record the temperature acquisition data in the tunnel section and the advanced borehole at the working face, as well as the temperature monitoring data of the pre-embedded sensor.

[0024] Data processing was performed to plot the changes in collected and monitored temperature data over time and space, and the spatiotemporal evolution of the temperature field in high-temperature tunnels was analyzed and summarized.

[0025] Temperature data collected from the tunnel cross-section and pre-drilling boreholes were used as geophysical temperature field observation data to perform three-dimensional tunnel geothermal field inversion, resulting in temperature field inversion results.

[0026] As an alternative implementation, the determination of temperature field test parameters and the setup of equipment include:

[0027] Determine the upper boundary temperature and lower boundary heat flux density of the model body in the experiment, and adjust the working parameters of the constant temperature liquid bath device and the electric heating film.

[0028] Determine the operating parameters of the constant temperature and humidity chamber;

[0029] Determine the layout plan for temperature acquisition devices at various locations within the tunnel body.

[0030] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0031] This invention constructs a similar physical model device for geological models of high-temperature tunnels, which is expected to overcome the difficulties of complex influencing factors, unclear mechanisms, and difficult-to-understand laws of temperature field in high-temperature tunnels. It provides the possibility of revealing the spatiotemporal evolution law of temperature field in real high-temperature tunnels and lays the foundation for the development of advanced detection and targeted imaging technology for abnormal high-temperature heat source structures.

[0032] The model provided by this invention can simulate the environmental characteristics inside the tunnel, the type of abnormal high temperature heat source, and the boundary conditions of the tunnel ground temperature field. It has wide applicability, can meet the requirements of simulation of various high ground temperature tunnel working conditions, and has high experimental accuracy and high reliability.

[0033] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0034] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0035] Figure 1 This is a schematic diagram of the testing system described in this invention;

[0036] Figure 2 This is a schematic diagram of the water-bearing layered heat source structure described in this invention;

[0037] Figure 3 This is a schematic diagram of the water-bearing fracture fault heat source structure described in this invention;

[0038] Figure 4 This is a schematic diagram of the tunnel cross-section temperature acquisition device and the advanced borehole temperature acquisition device described in this invention.

[0039] Among them, 1-Tunnel surrounding rock, 2-High temperature heat source structure, 3-Constant temperature water layer, 4-Electric heating film, 5-Polystyrene board insulation layer, 6-Simulated tunnel cavity, 7-Constant temperature liquid bath device, 8-Constant temperature and humidity machine, 9-Variable frequency fan, 10-Tunnel sidewall temperature acquisition device, 11-Working face temperature acquisition device, 12-Pre-embedded temperature monitoring sensor device, 13-Computer, 14-Constant temperature liquid bath device inlet pipe, 15-Constant temperature liquid bath device outlet pipe, 16-Soil layer, 17-Aquifer, 18-Rock layer, 19-Inlet pipe, 20-Outlet pipe, 21-Precast fractured rock mass material, 22-Working face, 23-Advanced drilling, 24-Temperature sensor, 25-Thermocouple, 26-Ventilation duct, 27-Temperature sensor array, 28-Tunnel sidewall and arch, 29-Advanced drilling temperature acquisition device. Detailed Implementation

[0040] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0041] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0042] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0043] Example 1

[0044] like Figure 1 As shown, a model test device for simulating high-temperature tunnel environment includes a model body, a model boundary control system, a tunnel temperature control system, and a temperature field data acquisition and monitoring system.

[0045] In this embodiment, the main body of the model includes tunnel surrounding rock 1 composed of similar materials, simulated tunnel cavity 6, and high-temperature heat source structure 2. The geometric similarity ratio between the actual high-temperature tunnel geological model and the model used in the physical model test is determined according to engineering parameters, and the dimensions of each part of the main body of the model are determined according to the geometric similarity ratio.

[0046] In this embodiment, the high-temperature heat source structure 2 is arranged along the vertical direction of the main body of the model, and can have a certain angle, such as Figure 1 As shown, it includes two structural types: simulated aquifer layered heat sources and aquifer fracture-fault heat sources. (See figure.) Figure 2As shown, the aquifer-layered heat source is a three-layer geological model, consisting of a soil layer 16, an aquifer 17, and a rock layer 18 from top to bottom. Thermocouples 25 are evenly arranged in the aquifer and connected to a computer 13. Figure 3 As shown, an inlet pipe 19 and an outlet pipe 20 are arranged at the lower part of the aquifer 17, with the other end of the inlet pipe 19 connected to a water tank. The water-bearing fracture fault heat source includes a prefabricated fractured rock mass simulation material 21, an inlet pipe 19, and an outlet pipe 20. The outlet pipe 20 is arranged at the lower end of the water-bearing fracture fault heat source structure, and the inlet pipe 19 is arranged at the upper end of the water-bearing fracture fault heat source structure, with the other end of the inlet pipe connected to a water tank.

[0047] In this embodiment, the model boundary control system includes a constant-temperature liquid bath device 7, an electric heating film 4, and a polystyrene insulation layer 5, which controls the temperature boundary conditions of the upper, lower, and surrounding boundaries of the model body. A constant-temperature water layer 3 is laid on the upper boundary of the model body. The constant-temperature water layer 3 is connected to the constant-temperature liquid bath device 7 through an inlet pipe 14 and an outlet pipe 15, enabling numerical temperature control of the upper boundary of the model body. An electric heating film 4 is uniformly laid on the lower boundary of the model body. The electric heating film 4 is connected to a computer 13, enabling control of the heat flux density at the lower boundary. The surrounding boundaries of the model body are set as insulated boundaries, controlled by laying polystyrene insulation layers 5 around the model body.

[0048] In this embodiment, the tunnel temperature control system includes a constant temperature and humidity machine 8, a variable frequency fan 9, and a ventilation duct 26. The variable frequency fan 9 is arranged at the top of the simulated tunnel cavity 6 at a certain distance from the working face. The variable frequency fan 9 is connected to the constant temperature and humidity machine 8 outside the main model through the ventilation duct 26 to control the temperature inside the tunnel cavity.

[0049] In this embodiment, the tunnel cavity 6 is located in the middle of the surrounding rock of the tunnel 1 and is horizontally positioned.

[0050] In this embodiment, as Figure 4As shown, the temperature field data acquisition and monitoring system includes a temperature field acquisition device and a pre-embedded sensor temperature monitoring device. The temperature field acquisition device includes a tunnel sidewall 10, a tunnel face 11, and an advanced borehole temperature acquisition device 29. Distributed fiber optic temperature measurement lines are arranged on the tunnel sidewall and arch 28, with the direction of the measurement lines consistent with the tunnel direction. Several temperature sensors 24 are arranged at equal intervals on each temperature measurement line, forming the tunnel sidewall temperature acquisition device 10. The tunnel face temperature acquisition device 11 is a temperature sensor array 27 arranged on the tunnel face. Fiber optic temperature measurement lines are arranged in the advanced boreholes 23 on the tunnel face, with several temperature sensors 24 arranged at certain intervals on the measurement lines, forming the advanced borehole temperature acquisition device 29. The pre-embedded sensor temperature monitoring device 12 includes temperature sensors 24 pre-embedded in the main body of the model and evenly distributed. The temperature sensor integration 24 is connected to a computer 13 to monitor temperature changes at various locations within the model.

[0051] In some embodiments, the similar materials of the model body are determined based on the actual surrounding rock conditions at the engineering site, and should have the same temperature field geophysical parameters such as thermal conductivity and thermal diffusivity.

[0052] In this embodiment, the geometric similarity ratio of the main body of the model is selected as 1:30. The main body of the high geothermal tunnel temperature field model test device has a size of 5m (length) × 2.5m (width) × 3m (height). The simulated tunnel cavity 6 has a length of 2m and a working face radius of 0.25m.

[0053] In this embodiment, the geological model of the aquifer layered heat source has the following dimensions: soil layer 16 (1.6m), aquifer 17 (0.4m), and rock layer 18 (1m).

[0054] Of course, in other embodiments, the above parameters can be adjusted and changed.

[0055] In this embodiment, the filling materials of the water-bearing layered heat source are as follows: the soil layer 16 is simulated using sandy mudstone material with low porosity and low thermal conductivity, and the rock layer 18 is simulated using sandstone and conglomerate material with high porosity and high thermal conductivity.

[0056] In this embodiment, the prefabricated fractured rock mass simulation material 21 in the water-bearing fractured fault heat source is selected from a material similar to the engineering fault layer.

[0057] In this embodiment, in the water-bearing fracture fault heat source structure, the prefabricated fracture rock mass simulation material 21 contains vertically connected fractures or fissures to simulate deep and large fractures in actual geology, with the purpose of acting as a water-conducting and heat-conducting channel.

[0058] In this embodiment, the temperature sensors 24 in the pre-embedded sensor temperature monitoring device 12 are evenly distributed in the model body in front of the face of the tunnel boring machine at 0.1m intervals.

[0059] The parameters and settings in the above embodiments can be adjusted or modified according to specific circumstances.

[0060] Example 2:

[0061] This invention also provides a method for testing a temperature field model of a high-temperature tunnel, comprising the following steps:

[0062] (1) High-temperature heat source model geological body structure 2 casting: After determining that the type of high-temperature heat source is a water-bearing layered heat source structure, the high-temperature heat source structure geological body is cast in the reserved space of the model.

[0063] The type of high-temperature heat source is determined by analyzing the hydrological and geological conditions within the tunnel construction area as investigated in the early stage, and then determining the type of heat source occurrence.

[0064] (2) Determination of temperature field test parameters, instrument debugging and equipment connection, specifically including:

[0065] 1) Model boundary condition parameter selection and instrument control: Adjust the working parameters of the constant temperature liquid bath device, and set the upper boundary temperature value of the model body according to the actual engineering conditions; adjust the working parameters of the electric heating film, investigate the geothermal data of the tunnel construction area, determine the average geothermal heat flux density value, and then calculate the lower boundary heat flux density value of the physical model according to the similarity criterion. The calculation formula is as follows:

[0066]

[0067] In the above formula, Q is the heat flux density and K is the thermal conductivity coefficient. Let A be the temperature gradient and A be the geometric similarity ratio.

[0068] 2) Selection of parameters for the tunnel temperature control system: Based on the actual ventilation conditions of the tunnel, set the operating parameters of the constant temperature and humidity machine, and set the temperature, humidity and power of the generated constant temperature and humidity airflow;

[0069] 3) Setting the intensity of high-temperature heat source: The temperature of the aquifer is adjusted by controlling the working parameters of the thermocouple through computer, that is, setting high-temperature heat sources of different intensities.

[0070] 4) Temperature field acquisition device parameter settings: A temperature sensor array is arranged on the tunnel face, with a total of 4 rows and 4 columns, and the adjacent spacing is 0.05m; temperature acquisition sections are arranged on the tunnel sidewalls and arch at a distance of 0.05m from the tunnel face, with 5 temperature sensors on each section, and the spacing between adjacent temperature monitoring sections is 0.05m, for a total of 4 monitoring sections; the advance borehole length is 0.8m, and the temperature sensors are arranged at 0.05m intervals, for a total of 16.

[0071] 5) Connect the above instruments and equipment, and connect them to computer 13 for use in the physical model test of the tunnel temperature field.

[0072] (3) Start the constant temperature liquid bath device 7 and the electric heating film device 4. The computer 13 records the temperature data of the pre-embedded sensor monitoring 12. After the temperature value stabilizes, carry out the next test.

[0073] (4) Start the constant temperature and humidity machine device 8, and at the same time, the computer 13 starts to record the temperature acquisition data of the tunnel section and the advanced borehole of the working face, and the temperature monitoring data of the pre-embedded sensor.

[0074] (5) Stop the model test, turn off the instruments and equipment, process the data, draw the curves of the changes of the collected and monitored temperature data with time and space, and analyze and summarize the spatiotemporal evolution law of the temperature field of the high geothermal tunnel.

[0075] (6) Conduct post-processing of temperature acquisition data. Use the temperature acquisition data of the tunnel sidewall 29, the tunnel face 22 or the advanced borehole 23 as geophysical temperature field observation data, carry out tunnel geothermal field inversion, obtain the inverted temperature field geological model, and verify it with the location, size, heat source intensity and other information of the actual buried high temperature heat source structure 2 and the temperature data information of the pre-buried sensor monitoring 12 to determine the accuracy of the detection method.

[0076] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A simulation and temperature field sensing monitoring model system for high geothermal environment in tunnels, characterized in that, This includes the main model, the model boundary control system, the cave temperature control system, and the temperature field data acquisition and monitoring system, among which: The main body of the model includes a tunnel surrounding rock model, a simulated tunnel cavity, and a high-temperature heat source structure. The high-temperature heat source structure is set vertically inside the tunnel surrounding rock model, including a simulated water-bearing layered heat source and a water-bearing fracture fault heat source. The simulated tunnel cavity is set horizontally inside the tunnel surrounding rock model. The model boundary control system includes a constant temperature liquid bath device, an electric heating film, and a heat insulation layer. The constant temperature liquid bath device is connected to a constant temperature water layer laid on the upper boundary of the model body. The electric heating film is laid on the lower boundary of the model body. The heat insulation layer is set on the four sides of the model body to control the temperature boundaries of the model body. The tunnel temperature control system is installed at the top of the simulated tunnel cavity to control the temperature inside the tunnel cavity. The temperature field data acquisition and monitoring system includes several temperature acquisition devices distributed on the sidewalls, working face and inside the model body to detect temperature changes at corresponding locations within the model body. The aquifer layered heat source is a three-layer geological model, consisting of a soil layer, an aquifer, and a rock layer from top to bottom. Thermocouples are evenly arranged in the aquifer and connected to a computer. An inlet pipe and an outlet pipe are arranged in the lower part of the aquifer, and the other end of the inlet pipe is connected to a water tank.

2. The tunnel high geothermal environment simulation and temperature field sensing and monitoring model system as described in claim 1, characterized in that, The main body of the model is made of similar materials; the similar materials are selected to have the same or similar thermal conductivity, thermal diffusivity and temperature field geophysical parameters as the surrounding rock to be simulated.

3. The tunnel high geothermal environment simulation and temperature field sensing and monitoring model system as described in claim 1, characterized in that, The water-bearing fracture fault heat source includes prefabricated fractured rock mass simulation material, an inlet pipe, and an outlet pipe. The outlet pipe is arranged at the lower end of the water-bearing fracture fault heat source structure, and the inlet pipe is arranged at the upper end of the water-bearing fracture fault heat source structure. The other end of the inlet pipe is connected to a water tank.

4. The tunnel high geothermal environment simulation and temperature field sensing and monitoring model system as described in claim 1, characterized in that, In the aforementioned water-bearing fractured fault heat source structure, the prefabricated fractured rock mass simulation material contains vertically connected fractures or fissures, which are used to simulate deep and large fractures in actual geology.

5. The tunnel high geothermal environment simulation and temperature field sensing and monitoring model system as described in claim 1, characterized in that, The tunnel temperature control system includes a constant temperature and humidity machine, a variable frequency fan, and ventilation ducts. The variable frequency fan is arranged at the top of the simulated tunnel cavity at a certain distance from the working face. The variable frequency fan is connected to the constant temperature and humidity machine outside the model body through the ventilation ducts.

6. The tunnel high geothermal environment simulation and temperature field sensing and monitoring model system as described in claim 1, characterized in that, The temperature acquisition device includes a temperature field acquisition device and a pre-embedded sensor temperature monitoring device. The temperature field acquisition device includes multiple temperature sensors or fiber optic temperature measuring lines, which are respectively installed in the sidewalls, working face and pre-drilled holes of the tunnel model. The pre-embedded sensor temperature monitoring device includes temperature sensors that are pre-embedded in the main body of the model and are evenly distributed.

7. The tunnel high geothermal environment simulation and temperature field sensing and monitoring model system as described in claim 6, characterized in that, The temperature acquisition device arranged at the working face is a temperature sensor array arranged at the working face; Distributed fiber optic temperature measuring lines are arranged on the tunnel sidewalls and arch, with the line arrangement direction consistent with the tunnel longitudinal direction; fiber optic temperature measuring lines are arranged in the advance boreholes at the tunnel face.

8. A method of operating the system according to any one of claims 1-7, characterized in that, Includes the following steps: After determining the type and structure of the high-temperature heat source, the geological body of the high-temperature heat source model is cast in the reserved space of the model. Determine the temperature field test parameters and set up the equipment; Start the constant temperature liquid bath device and the electric heating film device, record the temperature data monitored by the pre-embedded sensor, and after the temperature value stabilizes, start the constant temperature and humidity machine device to record the temperature acquisition data in the tunnel section and the advanced borehole at the working face, as well as the temperature monitoring data of the pre-embedded sensor. Data processing was performed to plot the changes in collected and monitored temperature data over time and space, and the spatiotemporal evolution of the temperature field in high-temperature tunnels was analyzed and summarized. Temperature data collected from the tunnel cross-section and pre-drilling boreholes were used as geophysical temperature field observation data to perform three-dimensional tunnel geothermal field inversion, resulting in temperature field inversion results.

9. The method of claim 8, characterized in that, The determination of temperature field test parameters and the setup of equipment include: Determine the upper boundary temperature and lower boundary heat flux density of the model body in the experiment, and adjust the working parameters of the constant temperature liquid bath device and the electric heating film. Determine the operating parameters of the constant temperature and humidity chamber; Determine the layout plan for temperature acquisition devices at various locations within the tunnel body.

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