Test system for thermal insulation structure of tunnel in cold region

Abstract

The utility model relates to a cold region tunnel thermal insulation structure test system, and relates to the technical field of tunnels. The cold region tunnel thermal insulation structure test system comprises a sealing chamber, a tunnel model of a target tunnel, a temperature regulator, a thermal insulation layer and a plurality of temperature sensors. The tunnel model is arranged in the sealing chamber, the sealing chamber comprises an outlet, and the outlet is sealed through a heat preservation structure; the tunnel model comprises a tunnel, a surrounding rock, and a primary support and a secondary lining which are arranged between the tunnel and the surrounding rock, and the thermal insulation layer is arranged between the primary support and the secondary lining; the temperature regulator is arranged in the sealed chamber and used for regulating the temperature of the environment where the tunnel model is located; the multiple temperature sensors are arranged in the tunnel and the surrounding rock and used for monitoring the temperature of the tunnel and the surrounding rock. The test equipment capable of reducing the low air temperature and the high surrounding rock side temperature in the tunnel hole in the cold region is closer to the actual condition of tunnel engineering.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tunnels, in particular to a cold region tunnel heat preservation structure test system. BACKGROUND

[0002] Due to the influence of geographical location, climate conditions and other factors, extreme environmental conditions such as cold, high altitude and snow and ice have brought great challenges to the safety and normal operation of tunnels. Therefore, a large number of scholars have carried out research on the heat preservation technology of cold region tunnels. A large number of scholars mainly study from frost heaving force and frost heaving path, and there are relatively few studies on test equipment for simulating the heat preservation effect of cold region tunnel structures indoors. CONTENT OF THE INVENTION

[0003] Embodiments of the present disclosure provide a cold region tunnel heat preservation structure test system.

[0004] Embodiments of the present disclosure provide a cold region tunnel heat preservation structure test system, comprising: a sealed chamber, a tunnel model of a target tunnel, a temperature regulator, a heat preservation layer and a plurality of temperature sensors; the tunnel model is placed in the sealed chamber, the sealed chamber comprises an outlet, and the outlet is sealed by a heat preservation structure; the tunnel model comprises a tunnel, surrounding rock, and primary support and secondary lining arranged between the tunnel and the surrounding rock, and the heat preservation layer is arranged between the primary support and the secondary lining; the temperature regulator is arranged in the sealed chamber and is used to adjust the temperature of the environment in which the tunnel model is located; and the plurality of temperature sensors are arranged in the tunnel and the surrounding rock and are used to monitor the temperature of the tunnel and the surrounding rock.

[0005] The technical solution of the present disclosure can restore the test equipment with low air temperature and high surrounding rock temperature in the cold region tunnel hole, and is closer to the actual situation of tunnel engineering.

[0006] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present disclosure, nor is it used to limit the scope of the present disclosure. Other features of the present disclosure will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0007] The accompanying drawings are used to better understand the present solution and do not constitute a limitation on the present disclosure. Among them:

[0008] Figure 1 FIG. 1 is a structural schematic diagram of an embodiment of the cold region tunnel heat preservation structure test system of the present disclosure;

[0009] Figure 2 FIG. 2 is a structural schematic diagram of another embodiment of the cold region tunnel heat preservation structure test system of the present disclosure. DETAILED DESCRIPTION

[0010] It should be noted that the following detailed description is exemplary in nature and is intended to provide further description of the present disclosure. Unless otherwise defined, 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 disclosure belongs.

[0011] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the present disclosure. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, components, and / or groups thereof, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0012] The embodiments in the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0013] In order to make the technical solutions and advantages of the present disclosure clearer, the present disclosure will be further described in detail below with reference to the drawings and specific embodiments.

[0014] Figure 1 A structural schematic diagram of an embodiment of the cold region tunnel heat preservation structure test system of the present disclosure. In Figure 1 the cold region tunnel heat preservation structure test system can include a sealed chamber 101, a tunnel model 102 of a target tunnel, and a temperature regulator 103.

[0015] The tunnel model 102 of the target tunnel is placed in the sealed chamber 101, and the sealed chamber 101 is a freezer. It is used to isolate the influence of external temperature on the tunnel model. In some specific practices, the sealed chamber can be a cubic structure.

[0016] The tunnel model can be a scaled-down version of the target tunnel, and the size is scaled down in proportion to the construction size of the target tunnel. The tunnel model can include a tunnel 1021, surrounding rock 1022, primary support 1023 and secondary lining 1024 arranged between the tunnel 1021 and the surrounding rock 1022, and heat preservation layer 1025 arranged between the primary support 1023 and the secondary lining 1024. A plurality of temperature sensors are arranged in the tunnel 1021 and the surrounding rock 1022 for monitoring the temperature of the surrounding rock and the tunnel. It can be understood that by comparing the temperature of the surrounding rock and the temperature of the tunnel, the heat preservation effect of the heat preservation layer can be evaluated.

[0017] The sealed chamber 101 is also provided with a temperature regulator 103 for adjusting the temperature in the sealed chamber 101. In this embodiment, since the target tunnel is located in a cold region, the tunnel model can be ensured to be in a cold environment in the freezer. By arranging the temperature regulator 103 in the sealed chamber 101, the temperature in the sealed chamber 101 can be more accurately adjusted.

[0018] The cold region tunnel heat preservation structure test system according to the embodiments of the present disclosure can test the heat preservation structure of a tunnel in an indoor environment, thereby evaluating the heat preservation effect of the heat preservation structure.

[0019] With reference to the accompanying drawings Figure 2 which shows a structural schematic diagram of another embodiment of the cold region tunnel heat preservation structure test system according to the present disclosure. In Figure 2 The cold region tunnel heat preservation structure test system shown in the figure includes a sealed chamber 201, a tunnel model 202 of a target tunnel, a temperature regulator 203, an outer boundary temperature control zone 204, a humidity regulator 205, a compressor 206, a refrigeration air conditioner 207, and a variable frequency fan 208.

[0020] The tunnel model 202 is placed in the sealed chamber 201, and the sealed chamber 201 is a freezer. In some specific implementations, the sealed chamber 201 can include an outlet, which is sealed by a two-layer heat preservation structure. In this way, the temperature of the sealed chamber 201 can be stabilized.

[0021] The tunnel model 202 includes a tunnel 2021, surrounding rock 2022, primary support 2023 and secondary lining 2024 arranged between the tunnel 2021 and the surrounding rock 2022, and a heat preservation layer 2025 arranged between the primary support 2023 and the secondary lining 2024. The secondary lining 2024 can be made of concrete with the same label as the primary support 2023, and the thickness is 50 cm. The primary support 2023 is made of 30 cm of sprayed concrete. The surrounding rock 2022 is obtained by splicing rock blocks generated by the approval of the construction of the target tunnel and fine sand sealing treatment, and the thickness is 60 cm.

[0022] A plurality of temperature sensors 2026 are arranged in the tunnel 2021 and the surrounding rock 2022 to monitor the temperature of the tunnel 2021 and the surrounding rock 2022. Specifically, each temperature sensor can be arranged at the interface between the surrounding rock 2022 and the heat preservation layer 2025 and the interface between the heat preservation layer 2025 and the tunnel 2021. In this way, the temperatures on both sides of the heat preservation layer can be more intuitively observed, so that the heat preservation effect of the heat preservation layer can be better evaluated. In some specific implementations, the temperature sensor is externally provided with a metal protective sleeve for protecting the probe of the temperature sensor, avoiding rust and ensuring long-term use. The metal protective sleeve can be made of stainless steel. The temperature sensor can use a WZP-001 type Pt100 single platinum thermal resistance sensing element as a temperature measuring probe, with a measurement range of -200-220℃, a temperature resolution of 0.01-0.05℃ for negative temperature, 0.01-0.03℃ for positive temperature, and a measurement accuracy of 0.05℃. The lead of the temperature sensor can be 5 meters. This is because the length of the tunnel model is about 1 meter, and each temperature sensor needs to be connected to a display, and a length of 5 meters can better cover the entire tunnel model, thereby ensuring data transmission and accurate and flexible testing.

[0023] A temperature regulator 203 is arranged in the sealed chamber 201 to regulate the temperature in the sealed chamber 201.

[0024] An outer boundary temperature control belt 204 is arranged outside the surrounding rock 2022 to heat and control the temperature of the surrounding rock 2022.

[0025] A humidity regulator 205 is arranged in the sealed chamber 201 to regulate the humidity of the sealed chamber 201.

[0026] A compressor 206 is arranged outside the sealed chamber 201 to regulate the air pressure in the sealed chamber 201.

[0027] A refrigeration air conditioner 207 and a variable frequency fan 208 are used to generate cold air with a specified temperature, a specified wind direction and a specified wind speed in the sealed chamber 202. Specifically, the refrigeration air conditioner 207 and the variable frequency fan 208 can be placed on the clear side of the tunnel 2021 of the tunnel model 202, which can ensure smooth ventilation and be more in line with the actual situation of the target tunnel.

[0028] The cold region tunnel heat preservation structure test system provided by the above embodiments of the present disclosure can simulate a more realistic tunnel environment indoors, which can reduce costs and increase efficiency for tunnel design and construction; and has a clear side ventilation condition, which is closer to the actual situation of tunnel engineering compared with traditional heat conduction test devices.

[0029] In the application of the cold region tunnel heat preservation structure test system of the present disclosure, the single variable principle can be adopted. That is, the single variable factor, by changing the wind speed, the other variables are constant, the influence of wind speed on the effect of cold region tunnel heat preservation structure can be determined. By changing the single variable factor of surrounding rock temperature, the other variables are constant, the influence of surrounding rock temperature on the effect of cold region tunnel heat preservation structure can be determined. Multi-factor coupling; that is, heat-flow-solid coupling, the influence of multiple factors on the effect of heat preservation technology can be adjusted, the surrounding rock temperature can be controlled by the outer boundary temperature control zone, the wind speed and temperature in the tunnel can be controlled by the refrigeration air conditioner and the frequency conversion fan, and the groundwater environment of the tunnel can be simulated by the water injection hole to simulate the groundwater environment of the tunnel, so that the influence of surrounding rock temperature, wind speed, temperature and groundwater on the effect of cold region tunnel heat preservation structure can be studied.

[0030] The cold region tunnel heat preservation structure test system of the present disclosure can simulate various different test conditions:

[0031] (1) Simulate different initial air temperatures in the tunnel. The refrigeration air conditioner and the frequency conversion fan can be used to ventilate the tunnel, and the refrigeration temperature can be adjusted to simulate different initial air temperatures in the tunnel.

[0032] (2) Simulate different initial rock temperatures of surrounding rock. The outer boundary temperature control zone heating system can adjust the temperature of the surrounding rock, and the temperature can be measured according to the test requirements.

[0033] (3) Simulate different humidity environments. The humidity of the refrigeration chamber can be adjusted by the humidity regulator, and the humidity regulator is provided with a humidity sensor to observe the humidity in real time.

[0034] (4) Simulate different wind speed conditions in the tunnel. The frequency conversion fan in front of the tunnel entrance can simulate different wind speed conditions in the tunnel.

[0035] (5) Simulate the groundwater conditions of the environment where the tunnel is located. The flowing water can be injected into the surrounding rock through the water injection hole to simulate the seepage of groundwater in the surrounding rock and the permeation of the lining segment.

[0036] The cold region tunnel heat preservation structure test system of the present disclosure can determine the experimental parameters according to the data measured by the meteorological environment of the proposed cold region tunnel portal, the tunnel geological environment and the groundwater environment, observe the tunnel heat preservation effect, provide design data for cold region tunnel structure heat preservation and cold prevention, and guide the design, construction and operation of cold region tunnel.

[0037] The above only describes the preferred embodiments of the present disclosure and does not limit the present disclosure. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A cold region tunnel heat preservation structure test system, characterized in that, The test system comprises: a sealed chamber, a tunnel model of a target tunnel, a temperature regulator, an insulation layer, and a plurality of temperature sensors; the tunnel model is placed in the sealed chamber, and the sealed chamber comprises an outlet which is sealed by an insulation structure; the tunnel model comprises a tunnel, surrounding rock, and primary support and secondary lining arranged between the tunnel and the surrounding rock, and the insulation layer is arranged between the primary support and the secondary lining; the temperature regulator is arranged in the sealed chamber and is used to adjust the temperature of the environment in which the tunnel model is located; the plurality of temperature sensors are arranged in the tunnel and the surrounding rock and are used to monitor the temperature of the tunnel and the surrounding rock.

2. The cold region tunnel thermal protection structure test system according to claim 1, wherein, The test system further comprises an outer boundary temperature control zone arranged outside the surrounding rock and used to heat and control the temperature of the surrounding rock.

3. The cold region tunnel thermal protection structure test system according to claim 1, wherein, The test system further comprises a humidity regulator arranged in the sealed chamber and used to adjust the humidity of the environment in which the tunnel is located.

4. The cold region tunnel thermal protection structure test system according to claim 1, wherein, The test system further comprises a compressor arranged outside the sealed chamber and used to adjust the air pressure in the sealed chamber.

5. The cold region tunnel thermal protection structure test system according to claim 1, wherein, The test system further comprises a refrigeration air conditioner and a variable frequency fan, which are used to generate cold air with a specified temperature, a specified wind direction, and a specified wind speed in the sealed chamber.

6. The cold region tunnel thermal protection structure test system according to claim 1, wherein, The sealed chamber is a freezer, and the insulation structure is a two-layer insulation structure.

7. The cold region tunnel thermal protection structure test system according to claim 1, wherein, The plurality of temperature sensors are arranged at the interface between the surrounding rock and the insulation layer and the interface between the insulation layer and the tunnel. The plurality of temperature sensors are externally provided with metal protective sleeves.

8. The cold region tunnel thermal protection structure test system according to claim 1, wherein, The secondary lining is made of concrete with a tunnel support structure label and has a thickness of 50 cm. The primary support is made of 30 cm of sprayed concrete. The surrounding rock is obtained by splicing rock blocks generated by the approval of the construction of the target tunnel and then treating the spliced rock blocks with fine sand sealing, and has a thickness of 60 cm.

9. The cold region tunnel thermal protection structure test system according to claim 1, wherein, The test system further comprises a water injection hole arranged on the surrounding rock. Flowing water is injected into the surrounding rock through the water injection hole.

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