CN116626098A - Model test device and test method for determining freezing-proof length of tunnel in cold region - Google Patents
Model test device and test method for determining freezing-proof length of tunnel in cold region Download PDFInfo
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- CN116626098A CN116626098A CN202310399595.1A CN202310399595A CN116626098A CN 116626098 A CN116626098 A CN 116626098A CN 202310399595 A CN202310399595 A CN 202310399595A CN 116626098 A CN116626098 A CN 116626098A
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- 238000010998 test method Methods 0.000 title claims abstract description 12
- 239000011435 rock Substances 0.000 claims abstract description 100
- 238000012544 monitoring process Methods 0.000 claims abstract description 55
- 238000007710 freezing Methods 0.000 claims abstract description 43
- 230000008014 freezing Effects 0.000 claims description 39
- 230000001105 regulatory effect Effects 0.000 claims description 10
- 230000002528 anti-freeze Effects 0.000 claims description 8
- 238000009413 insulation Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 239000011491 glass wool Substances 0.000 claims description 5
- 239000011152 fibreglass Substances 0.000 claims description 4
- 210000001624 hip Anatomy 0.000 claims description 3
- 208000001034 Frostbite Diseases 0.000 claims 1
- 238000004321 preservation Methods 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000006378 damage Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 1
- 229910052601 baryte Inorganic materials 0.000 description 1
- 239000010428 baryte Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000009746 freeze damage Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/06—Measuring arrangements specially adapted for aerodynamic testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/08—Aerodynamic models
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/10—Geothermal energy
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- Fluid Mechanics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Aerodynamic Tests, Hydrodynamic Tests, Wind Tunnels, And Water Tanks (AREA)
Abstract
The invention discloses a model test device and a test method for determining the antifreezing length of a tunnel in a cold region, wherein the model test device comprises the following steps: the tunnel model box is arranged in the temperature control chamber; the tunnel model box is in an open shape at the front end and the rear end, surrounding rocks are filled in the box body, an arched concrete lining is arranged in the surrounding rocks and positioned in the middle of the box body, and the concrete lining penetrates through the surrounding rocks front and rear to form a tunnel with the front end and the rear end penetrated; an exhaust type jet fan is arranged in the temperature control chamber and at the inlets of the front end and the rear end of the tunnel; an air temperature monitoring element is arranged on the jet fan and used for monitoring the temperature of air supplied into the tunnel; and a plurality of surrounding rock temperature monitoring elements are arranged in the surrounding rock and around the periphery of the tunnel, and the surrounding rock temperature monitoring elements are distributed at intervals along the radial extension line direction of the tunnel. The model test device simulates the wind speed and the wind temperature of air blown into the tunnel, so that the anti-freezing length of the tunnel under different natural wind conditions is determined.
Description
Technical Field
The invention belongs to the technical field of tunnel monitoring, and particularly relates to a model test device and a test method for determining the anti-freezing length of a tunnel in a cold region.
Background
The tunnels of railways and highways built in cold areas are different from tunnels in other areas, and serious freezing damage phenomena, such as water leakage and freezing of lining, frost heaving and cracking of side walls, freezing and blocking of drain pipes, and the like, often occur in the tunnels built in the cold areas. Due to the problem of freeze injury, tunnels in many severe cold regions in northwest and northeast China cannot be used for 8-9 months throughout the year, so that the use function of the tunnels is weakened to a great extent, and great potential safety hazards are brought to normal operation of railways.
At present, the requirements on the anti-freezing design and the anti-freezing capability of tunnels are also continuously improved. After the tunnel is penetrated, the cold air which invades the tunnel exchanges heat with the wall surface of the lining strongly, so that the temperature distribution of surrounding rock is changed, and the surrounding rock behind the lining is frozen. The laying of the heat preservation layer is a tunnel antifreezing heat preservation measure commonly adopted at present in China. When a tunnel insulation layer laying scheme is formulated, the material, the laying length and the laying thickness of the insulation layer need to be determined, and the materials, the laying length and the laying thickness are closely related to the freezing length of the tunnel in the cold region and the freezing thickness of surrounding rocks. Therefore, the determination of the antifreeze length of the tunnel in the cold region is significant. At present, the antifreezing heat preservation length of the tunnel in the cold region mostly adopts the length specified by the tunnel design specification. However, most of the length specified by the specification is empirically derived, and the antifreeze length specified by the specification may be insufficient or excessively long.
Disclosure of Invention
The invention aims to provide a model test device and a test method for determining the freezing length of a tunnel in a cold region.
The invention adopts the following technical scheme: a model test device for determining the freeze-proof length of a tunnel in a cold region, comprising: the tunnel model box is arranged in the temperature control chamber; the temperature control chamber is a closed cavity;
the tunnel model box is a cuboid box body with front and rear ends being open and other closed surfaces, surrounding rocks are filled in the box body, arch-shaped concrete lining is arranged in the surrounding rocks and positioned in the middle of the box body, the concrete lining penetrates through the surrounding rocks front and rear to form a tunnel with front and rear ends being penetrated;
an exhaust type jet fan is arranged in the temperature control chamber and at the inlets of the front end and the rear end of the tunnel and used for adjusting the wind speed entering the tunnel; an air temperature monitoring element is arranged on the jet fan and used for monitoring the temperature of air supplied into the tunnel;
a plurality of surrounding rock temperature monitoring elements are arranged in the surrounding rock and around the tunnel, and are divided into a plurality of groups and are arranged at intervals along the front-back axial direction of the tunnel; each group is divided into multiple groups, the groups are arranged around the tunnel at intervals on the same annular section, each group comprises 3-5 surrounding rock temperature monitoring elements, and the surrounding rock temperature monitoring elements are arranged at intervals along the radial extension line direction of the tunnel.
Further, surrounding rock temperature monitoring elements in each group are respectively arranged at the vault, the bottom, the left and right waists and the left and right basement of the tunnel.
Further, a plurality of wind speed monitoring elements are arranged in the tunnel, are distributed at intervals along the axial direction of the tunnel, and are respectively arranged at the vault and the left and right corners on the same section.
Further, the tunnel model box is a glass fiber reinforced plastic box body, and a glass wool insulation board is arranged on the outer side of the box body.
The invention also discloses a test method of the model test device for determining the freezing-proof length of the tunnel in the cold region, which comprises the following steps:
firstly, adjusting the temperature of a temperature control room, and measuring the initial temperatures of a tunnel and surrounding rock by an air temperature monitoring element and a surrounding rock temperature monitoring element correspondingly;
step two, adopting a control variable method to fix the wind speed of the jet fan, regulating the temperature of the temperature control room according to different preset temperatures, monitoring the temperature of the temperature control room by using an air temperature monitoring element, starting the jet fan while regulating the temperature of the temperature control room, and acquiring the surrounding rock temperatures under different air temperature conditions by using a surrounding rock temperature monitoring element;
after collection, closing the jet fan until the temperature of the tunnel and surrounding rock is heavy to the initial temperature;
step three, changing the wind speed of an exhaust type jet fan, repeating the step two, acquiring the temperatures of surrounding rocks under different air temperatures after the wind speed is changed by a surrounding rock temperature monitoring element, and determining the freezing length of the surrounding rocks in the axial direction of the tunnel and the freezing depth of the surrounding rocks in the radial direction of the tunnel under the changed wind speed condition by the acquired temperatures of the surrounding rocks;
fitting the relation between the freezing length of the tunnel and the wind speed and the relation between the freezing depth of surrounding rock and the wind temperature according to the freezing length of the tunnel in the axial direction and the freezing depth in the radial direction under the conditions of different wind speeds and wind temperatures, so as to obtain the freezing-proof length of the tunnel under different natural wind conditions.
The beneficial effects of the invention are as follows: 1. the influence of cold air with different wind speeds and wind temperatures on the surrounding rock temperature field of the tunnel in the cold region can be clarified, and the proper tunnel freezing-proof length is determined through the tunnel freezing length and the surrounding rock freezing thickness, so that better safety and economic benefits are achieved. 2. The method provides data support for the technical method of the tunnel heat preservation layer, is favorable for popularization of the heat preservation layer technology, and solves the problem of freezing injury of the tunnel in the cold region. 3. The complexity and the variability of wind speed and wind temperature at the inlet and outlet of the tunnel are considered, and the antifreezing length of the tunnel in the cold region is accurately determined; and the selected device is simple, and the test cost is low.
Drawings
FIG. 1 is a perspective view of a test device for determining the antifreeze length of a tunnel in a cold region according to the present invention;
FIG. 2 is a plan view of a test device for determining the antifreeze length of a tunnel in a cold region according to the present invention;
FIG. 3 is a flow chart of a test method of a test device for determining the freeze protection length of a tunnel in a cold region;
FIG. 4 is a graph of the relationship between the freezing depth of surrounding rock and the lowest air temperature in a cold region tunnel model test;
FIG. 5 is a graph showing the relationship between the freezing length and the lowest air temperature in a cold region tunnel model test tunnel.
Wherein: 1-a temperature control chamber; 2-tunnel model boxes; 3-glass fiber reinforced plastic box body; 4-a glass wool insulation board; 5-surrounding rock; 6-tunneling; 7-concrete lining; 8-an air draft type jet fan; 9-a surrounding rock temperature monitoring element; 10-an air temperature monitoring element; 11-wind speed monitoring element.
Detailed Description
The invention will be described in detail below with reference to the drawings and the detailed description.
The invention relates to a model test device for determining the antifreezing length of a tunnel in a cold region, which is shown in figures 1 and 2 and comprises the following components: a temperature control chamber 1 and a tunnel model box 2 placed in the temperature control chamber 1; the temperature control chamber 1 is a closed cavity and is used for controlling the temperature of the air outside the tunnel.
The tunnel model box 2 is a cuboid box body with front and rear ends being open and other surfaces being closed, surrounding rock 5 is filled in the box body, an arch-shaped concrete lining 7 is arranged in the surrounding rock 5 and positioned in the middle of the surrounding rock, the concrete lining 7 penetrates through the surrounding rock 5 front and rear to form a tunnel 6 with front and rear ends being penetrated; the tunnel model box 2 is a glass fiber reinforced plastic box body 3, and a glass wool insulation board 4 is arranged on the outer side of the box body.
An exhaust type jet fan 8 is arranged in the temperature control chamber 1 and at the inlets of the front end and the rear end of the tunnel 6 and is used for adjusting the wind speed entering the tunnel 3; an air temperature monitoring element 10 is arranged on the jet fan 8 and is used for monitoring the temperature of the air fed into the tunnel 6;
in the surrounding rock, and encircle and be provided with a plurality of surrounding rock temperature monitoring element 9 in tunnel 6 outer week, a plurality of surrounding rock temperature monitoring element 9 divide into the multiunit, and set up along tunnel 6 front and back axial direction interval, and the interval is 1m, divide into many subgroups again in every group, at same annular section, many subgroups encircle in tunnel 6 a week interval setting, include 3 ~ 5 surrounding rock temperature monitoring element 9 in every subgroup, and surrounding rock temperature monitoring element 9 is arranged along tunnel 6 radial extension line direction interval, and the interval is 0.15m. The surrounding rock temperature monitoring element 9 is used to monitor the surrounding rock temperature.
Surrounding rock temperature monitoring elements 9 in each group are respectively arranged at the arch crown, the bottom, the left and right arch waists and the left and right basement.
The tunnel 6 is internally provided with a plurality of wind speed monitoring elements 11 which are distributed at intervals along the axial direction of the tunnel 6, the distance between wind speed monitoring sections along the axial direction of the tunnel is 1m, and the wind speed monitoring sections are respectively arranged at the vault and the left and right corners on the same section.
As shown in fig. 3, a flowchart of a test method of the model test device for determining the antifreeze length of the tunnel in the cold region is shown as follows:
firstly, regulating the air temperature of a temperature control chamber 1, and measuring the initial temperatures of a tunnel 6 and surrounding rock 5 by using an air temperature monitoring element 10 and a surrounding rock temperature monitoring element 9 correspondingly;
step two, adopting a control variable method to fix the wind speed of the jet fan 8, regulating the temperature of the temperature control chamber 1 according to different preset temperatures, monitoring the temperature of the temperature control chamber 1 by using an air temperature monitoring element 10, starting the jet fan 8 while regulating the temperature of the temperature control chamber 1, and acquiring the surrounding rock temperatures under different air temperature conditions by using a surrounding rock temperature monitoring element 9; taking an isotherm at 0 ℃ as a standard of whether the surrounding rock is frozen or not, considering that the surrounding rock is frozen when the temperature of the surrounding rock is lower than 0 ℃, and determining the freezing length of the surrounding rock in the tunnel axial direction and the freezing depth of the surrounding rock in the tunnel radial direction under different air temperatures according to the acquired surrounding rock temperatures under different air temperatures;
after collection, closing the jet fan 8 until the temperature of the tunnel 6 and the surrounding rock 5 is heavy to the initial temperature;
step three, changing the wind speed of the exhaust type jet fan 8, repeating the step two, acquiring surrounding rock temperatures under different air temperatures after the wind speed is changed by a surrounding rock temperature monitoring element 9, and determining the freezing length of the surrounding rock in the axial direction of the tunnel and the freezing depth of the surrounding rock in the radial direction of the tunnel under the changed wind speed condition by the acquired surrounding rock temperatures;
fitting the relation between the freezing length of the tunnel and the wind speed and the relation between the freezing depth of surrounding rock and the wind temperature according to the freezing length of the tunnel in the axial direction and the freezing depth in the radial direction under the conditions of different wind speeds and wind temperatures, so as to obtain the freezing-proof length of the tunnel under different natural wind conditions.
To verify the test method in the present invention, the following test was performed:
the tunnel model box 2 is selected to have a length, a width and a height of 6m, 3m and 2m respectively. The length and radius of the tunnel 6 arranged in the surrounding rock 5 are 6m and 0.5m, respectively. The thickness of the glass wool heat preservation layer 4 is 5cm. The thickness of the concrete lining 7 is 0.1m. The surrounding rock 5 is formed by mixing soil, water, barite and saw dust according to the proportion of 0.74:0.16:0.12:0.03. The concrete lining 7 is formed by mixing cement, water and fine sand according to the proportion of 1.1:1.6:5.5.
The temperature regulation range of the temperature control chamber 1 is-20 ℃, and the wind speed regulation range of the air draft type jet fan 8 is 0-4 m/s.
The following test is carried out according to the test method for determining the cold area tunnel freezing prevention length test device:
1. the temperature of the temperature controlled compartment 1 is first adjusted so that the tunnel 6 and surrounding rock acquire a stable initial ground temperature.
2. The wind speed of the jet fan 8 is regulated and fixed to be 0.3m/s by adopting a control variable method according to T a Temperature A of the temperature control chamber 1 is regulated by the temperature of (A+18×sin) (2pi t/15+pi/2) to respectively obtain the temperature A at 1 ℃, 2 ℃, 3 ℃, 4 ℃ and 5 ℃; the surrounding rock temperature monitoring element 9 is used for collecting the surrounding rock temperatures of the jet fan 8, wherein the wind speed is 0.5m/s, and the lowest air temperature of the temperature control chamber 1 is respectively-17 ℃, -16 ℃, -15 ℃, -14 ℃ and-13 ℃. And taking the isotherm at 0 ℃ as a standard of whether the surrounding rock is frozen or not, considering that the surrounding rock is frozen when the temperature of the surrounding rock is lower than 0 ℃, and fitting to determine the relation among the freezing depth of the surrounding rock, the antifreezing length of the tunnel and the air temperature under the condition that the wind speed is 0.3m/s, as shown in figures 4 and 5.
3. The jet fan 8 is closed, and the temperature of the temperature control chamber 1 is adjusted until the tunnel 6 and surrounding rock recover to the initial ground temperature. The air speed of the jet fan 8 is regulated and fixed to be 0.8m/s, the temperature regulation mode of the temperature control chamber 1 in step 2 is repeated, the air speed of the jet fan 8 is collected by using the surrounding rock temperature monitoring element 9, and the minimum air temperature of the temperature control chamber 1 is respectively-17 ℃, -16 ℃, -15 ℃, -14 ℃ and-13 ℃ of surrounding rock temperature. And using an isothermal line at 0 ℃ as a standard of whether the surrounding rock is frozen or not, and fitting and determining the relation between the tunnel freezing prevention length and the air temperature under the condition that the wind speed is 1.0m/s, as shown in figure 5.
4. And respectively adjusting and fixing the air speeds of the jet fans 8 to be 1.2m/s, 1.5m/s and 2.0m/s, repeating the temperature adjusting mode of the temperature control room 1 in the second step, and respectively acquiring the surrounding rock temperatures corresponding to the lowest air temperatures of different temperature control rooms 1 under the conditions of the air speeds of 1.5m/s, 2.0m/s and 2.5m/s by using the surrounding rock temperature monitoring element 9, and fitting and determining the relation between the tunnel antifreezing length and the air temperature under the conditions of the air speeds of 1.5m/s, 2.0m/s and 2.5m/s, as shown in figure 5.
5. And summing up the freezing depths of surrounding rocks under different wind temperatures, and the freezing lengths of tunnels under different wind speeds and different wind temperatures, wherein the relation between the freezing of the surrounding rocks and the minimum air temperature is D=0.01875/(1+0.05355T), and the relation between the freezing lengths of the tunnels and the wind speeds is L= (-0.5557v+0.0004) multiplied by T-6.4219v-0.0448, so that the freezing lengths of the tunnels under different natural wind conditions are determined.
Claims (5)
1. A model test device for determining cold district tunnel length that prevents frostbite, characterized by comprising: a temperature control chamber (1) and a tunnel model box (2) placed in the Wen Kongshi (1); the temperature control chamber (1) is a closed cavity;
the tunnel model box (2) is a cuboid box body with front and rear ends being open and other surfaces being closed, surrounding rocks (5) are filled in the box body, arch-shaped concrete linings (7) are arranged in the surrounding rocks (5) and positioned in the middle of the surrounding rocks, and the concrete linings (7) penetrate through the surrounding rocks (5) front and rear to form tunnels (6) with front and rear ends being penetrated;
an exhaust type jet fan (8) is arranged in the temperature control chamber (1) and positioned at the inlets of the front end and the rear end of the tunnel (6) and used for adjusting the wind speed entering the tunnel (3); an air temperature monitoring element (10) is arranged on the jet fan (8) and is used for monitoring the temperature of air supplied into the tunnel (6);
a plurality of surrounding rock temperature monitoring elements (9) are arranged in the surrounding rock (5) and around the tunnel (6), and the plurality of surrounding rock temperature monitoring elements (9) are divided into a plurality of groups and are arranged at intervals along the front-back axial direction of the tunnel (6); each group is divided into multiple groups, the groups are arranged around the tunnel (6) at intervals along the same annular section, each group comprises 3-5 surrounding rock temperature monitoring elements (9), and the surrounding rock temperature monitoring elements (9) are arranged at intervals along the radial extension line direction of the tunnel (6).
2. A model test device for determining the freeze protection length of a tunnel in cold areas according to claim 1, characterized in that the surrounding rock temperature monitoring elements (9) in each subgroup are arranged at the arch, the bottom, the left and right waists and the left and right basement of the tunnel (6), respectively.
3. The model test device for determining the antifreeze length of the tunnel in the cold region according to claim 2, wherein a plurality of wind speed monitoring elements (11) are arranged in the tunnel (6), are axially arranged at intervals along the tunnel (6), and are respectively arranged at a vault and left and right corners on the same section.
4. A model test device for determining the antifreeze length of a tunnel in a cold region according to claim 3, wherein the tunnel model box (2) is a glass fiber reinforced plastic box body (3), and a glass wool insulation board (4) is arranged on the outer side of the box body.
5. The test method of the model test device for determining the antifreeze length of the tunnel in the cold region according to claim 1, wherein the test method is as follows:
firstly, adjusting the air temperature of a temperature control chamber (1), and measuring the initial temperatures of a tunnel (6) and surrounding rock (5) by using an air temperature monitoring element (10) and a surrounding rock temperature monitoring element (9) correspondingly;
step two, adopting a control variable method to fix the wind speed of a jet fan (8), regulating the air temperature of a temperature control chamber (1) according to different preset temperatures, monitoring the air temperature of the temperature control chamber (1) by using an air temperature monitoring element (10), starting the jet fan (8) while regulating the air temperature of the temperature control chamber (1), and acquiring the surrounding rock temperatures under different air temperature conditions by using a surrounding rock temperature monitoring element (9);
after collection, closing the jet fan (8) until the temperatures of the tunnel (6) and the surrounding rock (5) are heavy to the initial temperature;
step three, changing the wind speed of an exhaust type jet fan (8), repeating the step two, acquiring the temperature of the surrounding rock (5) under different air temperatures after the wind speed is changed by a surrounding rock temperature monitoring element (9), and determining the freezing length of the surrounding rock in the axial direction of the tunnel (6) and the freezing depth of the surrounding rock in the radial direction of the tunnel (6) under the changed wind speed condition by the acquired temperature of the surrounding rock (5);
fitting the relation between the freezing length of the tunnel and the wind speed and the relation between the freezing depth of the surrounding rock and the wind temperature according to the freezing length of the tunnel (6) in the axial direction and the freezing depth in the radial direction under the conditions of different wind speeds and wind temperatures, so as to obtain the freezing-proof length of the tunnel under different natural wind conditions.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310399595.1A CN116626098A (en) | 2023-04-13 | 2023-04-13 | Model test device and test method for determining freezing-proof length of tunnel in cold region |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310399595.1A CN116626098A (en) | 2023-04-13 | 2023-04-13 | Model test device and test method for determining freezing-proof length of tunnel in cold region |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117554412A (en) * | 2023-11-01 | 2024-02-13 | 中国铁道科学研究院集团有限公司 | Multifunctional test device for simulating freezing process of tunnel drainage system in cold region |
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2023
- 2023-04-13 CN CN202310399595.1A patent/CN116626098A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117554412A (en) * | 2023-11-01 | 2024-02-13 | 中国铁道科学研究院集团有限公司 | Multifunctional test device for simulating freezing process of tunnel drainage system in cold region |
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