A test device and method for diluting harmful gases seeping from tunnel surrounding rocks

Abstract

The present invention provides a test device and method for diluting harmful gases seeping from tunnel surrounding rocks, comprising an insulated box body, a shed-type support frame, a sensor assembly, a heating device, an air inlet assembly, an air outlet assembly, a harmful gas storage tank, and a gas flow controller. The shed-type support frame is disposed within the insulated box body, and the sensor assembly and the heating device are disposed within the shed-type support frame, wherein the sensor assembly is used to detect the concentration, temperature, and humidity of harmful gases. The air inlet assembly and the air outlet assembly are connected to the shed-type support frame and are used to introduce air into the shed-type support frame and discharge harmful gases from the interior. By testing the changes in the physiological indicators of mice, the hazard characteristics of harmful gases seeping from surrounding rocks in a high-temperature, high-humidity tunnel environment are reflected. By adjusting the fan parameters and based on the changing patterns of the physiological indicators of mice, the dilution effect of tunnel ventilation on harmful gases is studied, and the optimal ventilation mode and ventilation parameters of the new ventilation assembly in a high-temperature, high-humidity, and harmful gas tunnel environment are determined.

Description

Technical Field

[0001] The invention relates to a test for hazard characteristics of harmful gases in tunnels, in particular to a test device and method for diluting harmful gases seeping from tunnel surrounding rocks. Background Art

[0002] The geological conditions along the Sichuan-Tibet Railway tunnels are complex, characterized by significant high ground temperatures and high ground stresses. According to geological survey data from the Sichuan-Tibet Railway project, the main hazardous gases along the Sichuan-Tibet Railway tunnels include H2S, SO2, CO, CO2, and NO2. Under the disturbance of tunnel construction, these gases, contained within deep fault zones, may migrate along joints and fissures into the vicinity of the tunnel body, posing a threat to the safety and health of construction workers. Furthermore, the Sichuan-Tibet Railway tunnels are characterized by significant high temperatures and high humidity, and the hazard characteristics of harmful gases seeping from the surrounding rock under these conditions are unclear. This poses a serious threat to the health of workers and the progress of the project, presenting an urgent engineering challenge that needs to be addressed.

[0003] Existing research focuses on developing high-temperature, high-humidity environmental test chambers. However, there is a lack of test equipment capable of simulating the high-temperature, high-humidity, and hazardous gas environments in tunnels. This makes it impossible to fully understand the harmful characteristics of hazardous gases seeping from surrounding rock in these conditions. Tunnel ventilation is an effective measure to dilute hazardous gas concentrations, reduce ambient temperature and humidity, and thus ensure tunnel air quality. However, in the Sichuan-Tibet Railway tunnels, the high-temperature, high-humidity, and hazardous gas environments are significant. Existing ventilation systems have low efficiency and poor ventilation effectiveness, making them unable to meet the ventilation requirements of tunnel construction involving high-temperature, high-humidity, and hazardous gas environments. Summary of the Invention

[0004] The purpose of the present invention is to provide a test device and method for diluting harmful gases seeping from tunnel surrounding rocks, so as to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A test device for diluting harmful gas seepage from tunnel surrounding rock, comprising a heat preservation box body, a shed-type support frame, a sensor assembly, a heating device, an air inlet assembly, an air outlet assembly, a harmful gas storage tank and a gas flow controller, wherein:

[0007] The shed-type support frame is arranged in the body of the insulation box, and the sensor assembly and the heating device are arranged in the shed-type support frame, wherein the sensor assembly is used to detect the concentration, temperature and humidity of harmful gases, and the air inlet assembly and the air outlet assembly are connected to the shed-type support frame, and are used to introduce air into the shed-type support frame and discharge the harmful gases inside. The harmful gas storage tank is connected to the shed-type support frame through a gas flow controller.

[0008] Preferably, the air intake assembly includes an air pump, an air intake pipe, a connecting pipe, and an air outlet pipe. The air pump is connected to the air intake pipe, and the air outlet pipe is connected to the air intake pipe through the connecting pipe. The air outlet pipe is rotatably mounted on the connecting pipe, and the air outlet pipe is located in a shed-type support frame.

[0009] Preferably, the air intake assembly further includes a turbine and a telescopic rod assembly. The turbine is rotatably installed in the air intake pipe, and one end of the telescopic rod assembly is connected to the turbine, and the other end is connected to the air outlet pipe.

[0010] Preferably, the air intake assembly further includes a telescopic hose and a connecting frame, wherein the telescopic hose is connected to the air intake pipe and the other end is connected to the connecting pipe, and one end of the connecting frame is movably mounted on the air intake pipe and the other end is fixedly sleeved on the connecting pipe.

[0011] Preferably, the gas outlet assembly includes an exhaust gas treatment system and an exhaust pipe. The exhaust pipe is connected to the exhaust gas treatment system through a fan, and the exhaust pipe is located in a shed-type support frame.

[0012] Preferably, the sensor assembly consists of a harmful gas sensor, a temperature sensor and a humidity sensor.

[0013] Preferably, the test device further comprises a humidifier.

[0014] Preferably, the thermal insulation box body is open, wherein a cover is provided on the top of the thermal insulation box body, and a front panel of the thermal insulation box that can be opened or closed is provided on the front side of the thermal insulation box body.

[0015] A test method for diluting harmful gas seepage from tunnel surrounding rock is provided. The test method is based on the above-mentioned test device for diluting harmful gas seepage from tunnel surrounding rock and comprises the following steps:

[0016] S1. Remove the cover on the top of the insulated box so that the box is open.

[0017] S2. Install a shed-type support frame within the insulation box, with surrounding rock formwork placed on top and tunnel face formwork installed on the sides of the shed-type support frame. Place the heating device, humidifier, and sensor assembly within the shed-type support frame.

[0018] S3. Cast a similar model of the surrounding rock between the shed support frame, surrounding rock formwork, tunnel face formwork, and insulation box body to construct the surrounding rock model.

[0019] S4. After the surrounding rock model is constructed, open the front panel of the insulation box, remove the surrounding rock formwork and tunnel face formwork, and then install the cover plate.

[0020] S5. Arrange the air inlet assembly, air outlet assembly, and gas flow controller, and connect them to the interior of the shed support frame;

[0021] S6. Select six SPF mice of similar sex and good health, of similar weight, placed in the tunnel environment, and close the front panel of the incubator.

[0022] S7. Turn on the heating device so that the temperature sensor indicates the established test temperature. Turn on the humidifier so that the humidity sensor indicates the established test humidity. Then adjust the gas flow controller so that the harmful gas sensor indicates the established test harmful gas type and concentration.

[0023] S8. Cultivate the mice for one week. After the incubation period, open the front panel of the incubator, remove the experimental mice, and test their physiological indicators, such as body weight, hemoglobin, white blood cell count, and alanine aminotransferase. Record the test results and analyze the hazard characteristics of harmful gases seeping from the surrounding rock in the high-temperature, high-humidity tunnel environment.

[0024] S9. Operate the air intake assembly to introduce fresh air into the tunnel environment, and simultaneously operate the air outlet assembly to extract exhaust air from the tunnel environment. Purify the exhaust air through the exhaust gas treatment system and then discharge it to simulate mixed ventilation.

[0025] S10. Incubate the mice for one week using the simulated mixed ventilation method in step S9. After completion of the incubation period, open the front panel of the incubator, remove the experimental mice, and test their physiological indicators, such as body weight, hemoglobin, white blood cell count, and alanine aminotransferase. Record the test results and the readings of the temperature sensor, humidity sensor, and harmful gas sensor.

[0026] S11. Compare the test results of S8 and S10, comprehensively analyze the changes in mouse physiological indicators, environmental temperature and humidity, and harmful gas concentrations, and determine the ventilation effect of this test device on high temperature, high humidity, and harmful gas tunnels;

[0027] S12. Repeat S9-S10, replacing the air inlet and outlet components with conventional axial flow fans and ventilation ducts. Compare the test results with those in S10 to analyze the effectiveness of this test device in improving ventilation efficiency in tunnels exposed to high temperature, high humidity, and hazardous gases.

[0028] S13. Repeat S9-S10, changing the operating conditions of the air inlet and outlet components. Compare the test results with those of S10 to analyze the optimal ventilation method for this test device in the tunnel environment of high temperature, high humidity, and harmful gases.

[0029] S14. Repeat S9-S10, changing the ventilation parameters of the air inlet and outlet components, such as air volume and air pressure, and comparing the test results with those of S10 to analyze the optimal ventilation parameters for this test device in the tunnel environment of high temperature, high humidity, and harmful gases.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] This invention proposes a novel ventilation assembly comprising an air intake assembly and an air outlet assembly. The air intake assembly primarily comprises an air pump, an air intake pipe, a connecting pipe, an air outlet pipe, a turbine, a telescopic rod assembly, a telescopic hose, and a connecting frame. The air outlet assembly primarily comprises an exhaust gas treatment system and an exhaust pipe. This novel ventilation assembly allows for quick manual adjustment of the air intake assembly length and significantly improves ventilation efficiency.

[0032] This paper proposes a test method that uses changes in the physiological parameters of mice to characterize the harmful effects of harmful gases seeping from surrounding rock in high-temperature, high-humidity tunnel environments. By adjusting the operating conditions and parameters of the air inlet and outlet components, and based on the changing patterns of mouse physiological parameters, ambient temperature and humidity, and harmful gas concentrations, the experimental device's ventilation effect on tunnels exposed to high temperatures, high humidity, and harmful gases is determined. The optimal ventilation method and parameters for the new ventilation assembly in these tunnel environments are determined. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a front view of the overall structure of the present invention;

[0034] Figure 2 It is a side view of the overall structure of the present invention;

[0035] Figure 3 A three-dimensional schematic diagram of the air intake assembly of the present invention;

[0036] Figure 4 for Figure 3 Full cross-sectional view

[0037] In the figure: 1 insulation box body, 2 shed-type support frame, 3 sensor assembly, 4 heating device, 5 air intake assembly, 6 air outlet assembly, 7 humidifier, 8 harmful gas storage tank, 9 gas flow controller, 11 cover plate, 31 harmful gas sensor, 32 temperature sensor, 33 humidity sensor, 51 air pump, 52 air intake pipe, 53 connecting pipe, 54 air outlet pipe, 55 turbine, 56 telescopic rod assembly, 57 telescopic hose, 58 connecting frame, 61 exhaust gas treatment system, 62 exhaust pipe. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention. Example

[0039] See also Figures 1 to 4 , the present invention provides a technical solution:

[0040] A test device for diluting harmful gas seepage from tunnel surrounding rock, comprising an insulation box body 1, a shed-type support frame 2, a sensor assembly 3, a heating device 4, an air inlet assembly 5, an air outlet assembly 6, a humidifier 7, a harmful gas storage tank 8, and a gas flow controller 9, wherein:

[0041] The shed-type support frame 2 is arranged in the insulation box body 1, wherein the shed-type support frame 2 is the main supporting component for constructing the tunnel model. When the surrounding rock-similar materials are piled on the shed-type support frame 2, the tunnel model can be constructed, and gas circulation can be achieved between the shed-type support frame 2 and the surrounding rock-similar materials. The sensor component 3, the heating device 4 and the humidifier 7 are all arranged in the shed-type support frame 2, wherein the sensor component 3 is used to detect the concentration, temperature and humidity of harmful gases. The air inlet component 5 and the air outlet component 6 are connected to the shed-type support frame 2, and are used to introduce air into the shed-type support frame 2 and discharge the internal harmful gases, thereby realizing ventilation and dilution of the harmful gases so that the concentration of the harmful gases meets the construction standards. The harmful gas storage tank 8 is connected to the shed-type support frame 2 through the gas flow controller 9, and then the harmful gas to be tested is introduced into the tunnel through the harmful gas storage tank 8 to simulate the real construction environment. The harmful gas storage tank 8 stores gases such as H2S, SO2, CO, CO2, and NO2.

[0042] As a preferred embodiment, the air intake assembly 5 includes an air pump 51, an air intake pipe 52, a connecting pipe 53, and an air outlet pipe 54. The air pump 51 is connected to the air intake pipe 52, and the air outlet pipe 54 is connected to the air intake pipe 52 through the connecting pipe 53. The air outlet pipe 54 is rotatably installed on the connecting pipe 53. The air outlet pipe 54 is located in the shed-type support frame 2. The air outlet pipe 54 is circumferentially provided with air holes, so that the air pumped into the air outlet pipe 54 by the air pump 51 can enter the tunnel along the air holes, and the air outlet pipe 54 is rotatably installed. Therefore, the rotating air outlet pipe 54 during air outlet can disturb the air in the tunnel, increase the gas circulation rate, and greatly improve the ventilation efficiency.

[0043] As a preferred embodiment, the air intake assembly 5 also includes a turbine 55 and a telescopic rod assembly 56. The turbine 55 is rotatably mounted in the air intake pipe 52, and one end of the telescopic rod assembly 56 is connected to the turbine 55, and the other end is connected to the air outlet pipe 54. The telescopic rod assembly 56 can be telescopic and the entire assembly can rotate synchronously, such as the cooperation of the inner rod and the outer rod, and the inner rod and the outer rod are splined. Then, when the air pump 51 pumps air, it will drive the turbine 55 to rotate, and the power of the turbine 55 drives the air outlet pipe 54 to rotate through the telescopic rod assembly 56, thereby avoiding the intervention of other power drive devices. Of course, the driving method of the air outlet pipe 54 is not limited to this. It can also be driven by an electric motor, a motor or other components that can output a rotational form. This embodiment only discloses one of the driving methods. In actual application, those skilled in the art can adaptively select the driving method.

[0044] As a preferred embodiment, the air intake assembly 5 also includes a telescopic hose 57 and a connecting frame 58. The telescopic hose 57 is connected to the air intake pipe 52, and the other end is connected to the connecting pipe 53. One end of the connecting frame 58 is movably mounted on the air intake pipe 52, and the other end is fixedly sleeved on the connecting pipe 53, wherein the connecting frame 58 forms a moving pair in the direction of the central axis of the air intake pipe 52. Then, by moving the connecting frame 58, the connecting pipe 53 can be driven to expand and contract, and ultimately the overall length of the air intake assembly 5 is changed, so that it can adapt to different experimental environments. The telescopic rod assembly 56 as a transmission connection component can be expanded and contracted, thereby avoiding the motion interference caused by the change of the overall length of the air intake assembly 5.

[0045] As a preferred embodiment, the gas outlet component 6 includes an exhaust gas treatment system 61 and an exhaust pipe 62, wherein the exhaust gas treatment system 61 serves as a storage unit for collecting exhaust gas, and the exhaust gas treatment system 61 integrates a catalyst for degrading harmful gases, so that H2S, SO2, CO, CO2, NO2 and other gases discharged from the tunnel undergo oxidation or reduction reactions, similar to the three-way catalytic converter in the exhaust system of an automobile, and are finally discharged in the form of harmless gases. The exhaust pipe 62 is connected to the exhaust gas treatment system 61 through a fan, and the exhaust pipe 62 is located in the shed-type support frame 2, and the gas in the tunnel is then sucked into the exhaust gas treatment system 61 through the fan.

[0046] As a preferred embodiment, the sensor assembly 3 is composed of a harmful gas sensor 31, a temperature sensor 32 and a humidity sensor 33, wherein the harmful gas sensor 31 is used to detect the concentration of gases such as H2S, SO2, CO, CO2, NO2, and the concentration detection of a single gas or a mixed gas is a conventional means for those skilled in the art. The specific sensor model will not be described here, and the sensor model can be reasonably selected in specific use.

[0047] As a preferred embodiment, the insulated box body 1 is open, with a cover 11 on the top and an openable and closable front panel on the front. Furthermore, the insulated box body 1, serving as a test chamber, is a modular structure, facilitating the construction of the tunnel surrounding rock model and the installation of corresponding components.

[0048] A test method for diluting harmful gas seepage from tunnel surrounding rock is provided. The test method is based on the above-mentioned test device for diluting harmful gas seepage from tunnel surrounding rock and comprises the following steps:

[0049] S1. Remove the cover plate 11 on the top of the insulation box 1, leaving the insulation box 1 open to facilitate the casting of the surrounding rock model and the construction of the internal experimental components;

[0050] S2. Install a shed-type support frame 2 within the insulation box 1. Place surrounding rock formwork on top of shed-type support frame 2 and tunnel face formwork on the sides of shed-type support frame 2 to construct the tunnel shape. Place the heating device 4, humidifier 7, and sensor assembly 3 within shed-type support frame 2.

[0051] S3. Construct a surrounding rock model by casting a surrounding rock model between the scaffolding frame 2, the surrounding rock formwork, the tunnel face formwork, and the insulation box body 1. The surrounding rock model is constructed using similar materials such as coarse aggregates such as quartz sand and barium sulfate, and fine aggregates such as gypsum and clay.

[0052] S4. After the surrounding rock model is constructed, open the front panel of the insulation box, remove the surrounding rock formwork and tunnel face formwork, and then install the cover plate 11.

[0053] S5. Arrange the air inlet assembly 5, the air outlet assembly 6 and the gas flow control meter 9, and connect them to the interior of the shed support frame 2;

[0054] S6. Select six SPF mice of similar sex and good health, of similar weight, placed in the tunnel environment, and close the front panel of the incubator.

[0055] S7. Turn on heating device 4 so that temperature sensor 32 indicates the predetermined test temperature. Turn on humidifier 7 so that humidity sensor 33 indicates the predetermined test humidity. Then, adjust gas flow controller 9 so that harmful gas sensor 31 indicates the predetermined test harmful gas type and concentration, thereby controlling the experimental temperature, humidity, and harmful gas concentration. This step allows for adaptive adjustment of environmental parameters based on different experimental requirements. Hazardous gas storage tank 8 stores H2S, SO2, CO, CO2, NO2, and other gases. Therefore, the harmful gases entering the tunnel are H2S, SO2, CO, CO2, NO2, and other gases.

[0056] S8. Cultivate the mice for one week. After the incubation period, open the front panel of the incubator, remove the experimental mice, and test their physiological indicators, such as body weight, hemoglobin, white blood cell count, and alanine aminotransferase. Record the test results and analyze the hazard characteristics of harmful gases seeping from the surrounding rock in the high-temperature, high-humidity tunnel environment.

[0057] S9. Operate intake assembly 5 to introduce fresh air into the tunnel environment, and simultaneously operate exhaust assembly 6 to extract exhaust gases from the tunnel environment. These gases are purified through exhaust treatment system 61 and then discharged, simulating mixed ventilation. The operating principle of intake assembly 5 is as follows: air pump 51 pumps air into the tunnel through exhaust pipe 54. During this process, turbine 55 rotates under the influence of the airflow, causing exhaust pipe 54 to rotate accordingly. This turbulence in the tunnel air improves ventilation efficiency. The operating principle of exhaust assembly 6 is as follows: the fan in exhaust pipe 62 extracts mixed gases, causing harmful gases to enter exhaust treatment system 61. The harmful components of the mixed gases are then oxidized or reduced by exhaust treatment system 61 and discharged.

[0058] S10. Incubate the mice for one week using the simulated mixed ventilation method in step S9. After completion of the incubation period, open the front panel of the incubator, remove the experimental mice, and test their physiological indicators, such as body weight, hemoglobin, white blood cell count, and alanine aminotransferase. Record the test results and the readings of the temperature sensor, humidity sensor, and harmful gas sensor.

[0059] S11. Compare the test results of S8 and S10, comprehensively analyze the changes in mouse physiological indicators, environmental temperature and humidity, and harmful gas concentrations, and determine the ventilation effect of this test device on high temperature, high humidity, and harmful gas tunnels;

[0060] S12. Repeat S9-S10, replacing the air inlet and outlet components with conventional axial flow fans and ventilation ducts. Compare the test results with those in S10 to analyze the effectiveness of this test device in improving ventilation efficiency in tunnels exposed to high temperature, high humidity, and hazardous gases.

[0061] S13. Repeat S9-S10, changing the operating conditions of the air inlet and outlet components. Compare the test results with those of S10 to analyze the optimal ventilation method for this test device in the tunnel environment of high temperature, high humidity, and harmful gases.

[0062] S14. Repeat S9-S10, changing the ventilation parameters of the air inlet and outlet components, such as air volume and air pressure, and comparing the test results with those of S10 to analyze the optimal ventilation parameters for this test device in the tunnel environment of high temperature, high humidity, and harmful gases.

[0063] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A test device for diluting harmful gas seepage from tunnel surrounding rock, comprising a heat preservation box body (1), a shed-type support frame (2), a sensor assembly (3), a heating device (4), an air inlet assembly (5), an air outlet assembly (6), a harmful gas storage tank (8), and a gas flow controller (9). It is characterized by: The shed-type support frame (2) is arranged in the heat preservation box body (1), and the sensor assembly (3) and the heating device (4) are arranged in the shed-type support frame (2), wherein the sensor assembly (3) is used to detect the concentration, temperature and humidity of harmful gases, and the air inlet assembly (5) and the air outlet assembly (6) are connected to the shed-type support frame (2) and are used to introduce air into the shed-type support frame (2) and discharge harmful gases inside. The harmful gas storage tank (8) is connected to the shed-type support frame (2) through a gas flow controller (9); The air intake assembly (5) includes an air pump (51), an air intake pipe (52), a connecting pipe (53), and an air outlet pipe (54). The air pump (51) is connected to the air intake pipe (52), and the air outlet pipe (54) is connected to the air intake pipe (52) through the connecting pipe (53). The air outlet pipe (54) is rotatably mounted on the connecting pipe (53), and the air outlet pipe (54) is located in the shed-type support frame (2). The air intake assembly (5) further comprises a turbine (55) and a telescopic rod assembly (56). The turbine (55) is rotatably mounted in the air intake pipe (52), and one end of the telescopic rod assembly (56) is connected to the turbine (55), and the other end is connected to the air outlet pipe (54).

2. The test device for diluting harmful gas seepage from tunnel surrounding rock according to claim 1, characterized in that: The air intake assembly (5) further comprises a telescopic hose (57) and a connecting frame (58). The telescopic hose (57) is in communication with the air intake pipe (52), and the other end is in communication with the connecting pipe (53). One end of the connecting frame (58) is movably mounted on the air intake pipe (52), and the other end is fixedly sleeved on the connecting pipe (53).

3. The test device for diluting harmful gas seepage from tunnel surrounding rock according to claim 1, characterized in that: The gas outlet assembly (6) comprises an exhaust gas treatment system (61) and an exhaust pipe (62). The exhaust pipe (62) is connected to the exhaust gas treatment system (61) via a fan, and the exhaust pipe (62) is located inside the shed-type support frame (2).

4. The test device for diluting harmful gas seepage from tunnel surrounding rock according to claim 1, characterized in that: The sensor assembly (3) consists of a harmful gas sensor (31), a temperature sensor (32) and a humidity sensor (33).

5. The test device for diluting harmful gas seepage from tunnel surrounding rock according to claim 1, characterized in that: The test device also includes a humidifier (7).

6. The test device for diluting harmful gas seepage from tunnel surrounding rock according to claim 1, characterized in that: The heat preservation box body (1) is open, wherein a cover plate (11) is provided on the top of the heat preservation box body (1), and a heat preservation box front panel that can be opened or closed is provided on the front side of the heat preservation box body (1).

7. A test method for diluting harmful gases seeping from tunnel surrounding rocks, characterized in that: The test method is based on the test device for diluting harmful gas seepage from tunnel surrounding rock in claim 1, and comprises the following steps: S1. Remove the cover plate (11) on the top of the thermal insulation box body (1) so that the thermal insulation box body (1) is open; S2. A shed-type support frame (2) is provided in the heat preservation box body (1), a surrounding rock template is arranged on the top of the shed-type support frame (2), and a tunnel face template is provided on the side of the shed-type support frame (2), and a heating device (4), a humidifier (7), and a sensor assembly (3) are arranged in the shed-type support frame (2); S3. Cast a similar model of the surrounding rock between the shed support frame (2), the surrounding rock formwork, the tunnel face formwork and the insulation box body (1), thereby constructing the surrounding rock model; S4. After the surrounding rock model is constructed, open the front panel of the insulation box, remove the surrounding rock template and tunnel face template, and then install the cover plate (11); S5. Arrange the air inlet assembly (5), the air outlet assembly (6) and the gas flow controller (9) so as to communicate with the interior of the shed-type support frame (2); S6. Select six SPF mice of similar sex and good health, of similar weight, placed in the tunnel environment, and close the front panel of the incubator. S7. Turn on the heating device (4) so ​​that the temperature sensor (32) indicates the predetermined test temperature, turn on the humidifier (7) so that the humidity sensor (33) indicates the predetermined test humidity, and then adjust the gas flow controller (9) so that the harmful gas sensor (31) indicates the predetermined test harmful gas type and concentration; S8. Cultivate the mice for one week. After the incubation period, open the front panel of the incubator, remove the experimental mice, test their physiological indicators, record the test results, and analyze the hazard characteristics of harmful gases seeping from the surrounding rock in the high-temperature, high-humidity tunnel environment. S9. Operate the air intake assembly (5) to input fresh air into the tunnel environment, and operate the air outlet assembly (6) synchronously to extract exhaust gas from the tunnel environment, and purify the exhaust gas through the exhaust gas treatment system (61) before discharging the exhaust gas, so as to simulate mixed ventilation; S10. Incubate the mice for one week using the simulated mixed ventilation method described in step S9. After completion, open the front panel of the incubator, remove the test mice, and test their physiological parameters. Record the test results and the readings of the temperature sensor, humidity sensor, and harmful gas sensor. S11. Compare the test results of S8 and S10, comprehensively analyze the changes in mouse physiological indicators, environmental temperature and humidity, and harmful gas concentrations, and determine the ventilation effect of this test device on high temperature, high humidity, and harmful gas tunnels; S12. Repeat S9-S10, replacing the air inlet and outlet components with conventional axial flow fans and ventilation ducts. Compare the test results with those in S10 to analyze the effectiveness of this test device in improving ventilation efficiency in tunnels exposed to high temperature, high humidity, and hazardous gases. S13. Repeat S9-S10, changing the operating conditions of the air inlet and outlet components. Compare the test results with those of S10 to analyze the optimal ventilation method for this test device in the tunnel environment of high temperature, high humidity, and harmful gases. S14. Repeat S9-S10, changing the ventilation parameters of the air inlet and outlet components, and compare the test results with S10 to analyze the optimal ventilation parameters of this test device in the tunnel environment of high temperature, high humidity, and harmful gases.

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