CN216043717U - Subway communication channel freezing method construction interface simulation test system for traversing methane-containing stratum - Google Patents
Subway communication channel freezing method construction interface simulation test system for traversing methane-containing stratum Download PDFInfo
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- CN216043717U CN216043717U CN202122181488.0U CN202122181488U CN216043717U CN 216043717 U CN216043717 U CN 216043717U CN 202122181488 U CN202122181488 U CN 202122181488U CN 216043717 U CN216043717 U CN 216043717U
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Abstract
A subway communication channel freezing method construction interface simulation test system penetrating through a methane-containing stratum is characterized by comprising a temperature measurement system (1), a freezing and thawing model box (2), a refrigeration system (3), a soil body (4), a methane simulation system (5) and a tunnel model pipe (6); the distance between the methane simulation system (5) and the axis of the tunnel model pipe (6) and the freeze-thaw model box (2) are divided into A, B, C chambers at intervals to form a test control group. The refrigerating system (3) provides a cold source to freeze soil around the tunnel mould pipe (6); the methane simulation system (5) is used for simulating geological soil containing methane. The system can simulate the unfavorable geological soil body containing methane, which is actually consistent with the unfavorable geological soil body containing methane and stored in a bulk form. The device can bear the experimental study on the influence of the unfavorable geology containing methane on the subway communication channel freezing method construction, provide a basis for the future related engineering and reduce the construction risk. The device has the advantages of simple operation and low manufacturing cost.
Description
Technical Field
The utility model belongs to the field of subway tunnels, relates to a subway contact tunnel freezing method construction interface simulation test system for traversing a methane-containing stratum, and is suitable for the research of subway contact tunnel freezing method construction interface effects.
Background
In recent years, with the continuous advance of urbanization, the construction of subway tunnels is particularly rapid. The communication channel is used as a channel with communication, drainage and fire prevention functions and also shows a special position in construction. Usually, the connection channel needs to be reinforced before excavation, and common reinforcing methods include a ground reinforcing method, a grouting reinforcing method in a tunnel and a freezing reinforcing method. Freezing consolidation has been widely used as a common method.
The freezing method is a stratum reinforcing method which freezes water in a stratum into ice by an artificial refrigeration technology, changes natural rock soil into artificial frozen soil, forms a frozen soil curtain, isolates underground water and improves the strength and stability of a soil body. The frozen soil forms a cylindrical closed curtain (frozen soil curtain) between two adjacent tunnels, a plurality of interfaces exist between the boundary of the curtain and the surrounding environment, heat exchange is carried out between the frozen soil and the outside at the interface, so that the cold loss is caused, the temperature field change is caused, the boundary frozen soil is melted seriously, the inner water system and the outer water system of the curtain are communicated, the water-resisting property is invalid, and the phenomena of water seepage, sand gushing and the like are caused when the communication channel is excavated. The long-term cold loss can lead to freezing the reason and move backward continuously, influences the whole stability of curtain, and serious person will cause the contact passageway pore wall to collapse, if inside the tunnel is gushed to soil, forms a large amount of losses, will cause the stratum to sink. It can be seen that the interface effect is an important influencing factor in the freezing method construction.
In addition, the geological environment that urban subways face is usually complex and changeable, and geological exploration cannot be carried out in all directions. Various unfavorable geology can be inevitably met during construction, and particularly, the construction danger is greatly increased when a methane stratum containing methane as a main component is met. However, at present, the influence of the formation containing methane on the freezing method construction is rarely researched, and the existing model test equipment cannot support the development of a simulation experiment, so that the research progress is hindered. Therefore, in order to overcome the defects of the existing freezing method model test equipment and probe the influence of a methane-frozen soil interface on the subway communication channel freezing method construction, a related simulation experiment system for guiding the methane stratum freezing method construction is urgently needed.
SUMMERY OF THE UTILITY MODEL
The utility model provides a simulation test system for a subway communication channel freezing method construction interface penetrating through a methane-containing stratum, which aims to overcome the defect that the influence of a detected methane-frozen soil interface on subway communication channel freezing method construction cannot be detected by the conventional test equipment, detects the influence of the methane-frozen soil interface on the subway communication channel freezing method construction, can simulate the influence effect of detecting the influence of the methane-containing stratum penetrating through the upper portion or the lower portion of the subway communication channel and the methane-containing stratum with different burial depths on the freezing method construction, and has the advantages of simple operation and low manufacturing cost.
Technical scheme
The subway communication channel freezing method construction interface simulation test system penetrating through a methane-containing stratum is characterized by comprising a temperature measurement system 1, a freezing and thawing model box 2, a refrigeration system 3, a soil body 4, a methane simulation system 5 and a tunnel model pipe 6; the freezing and thawing model box 2 comprises two steel clamping plates 201 and a model box cover 7. The two steel clamping plates 201 are arranged in the freeze-thaw model box 2 at intervals, and the freeze-thaw model box 2 is divided into A, B, C three chambers; the B, C two chambers are covered by a model box cover 7. The chamber A is not provided with the methane simulation system 5, the chamber B, C is provided with the methane simulation system 5, the distance from the methane release point of the methane simulation system 5 in the chamber B, C to the axis of the tunnel model pipe 6 is different, and the A, B, C chambers form a test control group. The biogas simulation system 5 is arranged in B, C two chambers to provide a biogas test environment during freezing.
The refrigerating system 3 comprises a freezing liquid 301, a plurality of freezing liquid outer hoses 302, a plurality of freezing pipes 303, 2 water separators 304 and a refrigerator 305. The refrigerator 305 is used to produce and transport the frozen liquid 301. The freezing liquid outer hose 302 is connected with a water separator 304 and a refrigerator 305; the two water distributors 304 are respectively arranged on two side surfaces in the freeze-thaw model box 2 and are respectively used for shunting and converging the freezing liquid 301; the freezing pipes 303 are connected with the water separator 304, and the divided freezing liquid 301 flows into the freezing pipes 303 respectively; with the tunnel mold pipe 6 as an axis, the freezing pipes 303 are parallel to the tunnel mold pipe 6, meanwhile, the freezing pipes 303 are uniformly distributed around the tunnel mold pipe 6, and the freezing area and the freezing interface of the tunnel mold pipe 6 are formed by the freezing liquid 301 flowing in each freezing pipe 303 of the refrigerating system 3.
The temperature measurement system 1 comprises a temperature measurement instrument 101, a lead 102 and a plurality of temperature measurement probes 103; the temperature measuring instrument 101 is arranged outside the freeze-thaw model box 2; the plurality of temperature measuring probes 103 are connected with a temperature measuring instrument 101 through leads 102; the temperature measuring instrument 101 is used for receiving and displaying temperature measuring data of the plurality of temperature measuring probes 103; in the axial temperature measurement system 1 distributed in A, B, C three cavities, temperature measurement probes are distributed at different radiation distances on a plurality of radial temperature measurement probes 103 by taking the tunnel model tube 6 as an axis, and the temperature at different positions is measured.
The biogas simulation system 5 comprises a biogas pipe 501, a pressurizing pipe 502, pressure-bearing gas 503, a double-layer airbag 504, biogas 505, a pressure-bearing valve 506 and a biogas air compressor 507; the double-layer air bag 504 comprises an outer bag 5041 and an inner bag 5042, wherein the outer bag 5041 is in a fishing net shape; one end of the biogas pipe 501 is connected with a biogas air compressor 507, and the other end is connected with an outer bag 5041 and used for conveying biogas 505. One end of the pressurizing pipe 502 is connected with the methane gas compressor 507, and the other end is connected with the inner bag 5042 and used for conveying the pressure-bearing gas 503. The pressure-bearing valve 506 is positioned at the joint of the biogas pipe 501, the pressurizing pipe 502 and the biogas compressor 507 to prevent backflow of biogas and pressure-bearing gas. Biogas is released into the soil 4 through the outer bag 5041, the double-layer air bag 504 shrinks after releasing the biogas, and a biogas cluster is formed at the position of the original double-layer air bag 504 to simulate geological soil containing the biogas.
The tunnel model pipe 6 is arranged in the freeze-thawing model box 2, and both ends of the tunnel model pipe are fixed on the inner wall of the freeze-thawing model box 2 after passing through the steel clamping plate 201, so as to simulate a subway communication channel in reality.
Advantageous effects
The subway contact passage freezing method construction interface simulation test system for traversing the stratum containing the methane is suitable for the research of the subway contact passage freezing method construction interface effect.
The device has the following advantages:
(1) the unfavorable geological soil body containing methane, which is actually consistent with the geological soil body and stored in a bulk form, can be simulated.
(2) The device can bear the experimental study on the influence of the unfavorable geology containing methane on the subway communication channel freezing method construction, provide a basis for the future related engineering and reduce the construction risk.
(3) The device has the advantages of simple operation and low manufacturing cost.
Drawings
FIG. 1 is a longitudinal section of a freeze-thaw model box
FIG. 2 is a schematic view of the pressure-bearing of the double-layer air bag inner bag of the biogas simulation system
FIG. 3 is a schematic view showing the pressure relief of the inner bag of the double-layer air bag and the filling of the outer bag with methane in the methane simulation system
FIG. 4 is a top view of a mold case cover
FIG. 5 is a three-dimensional schematic view of a steel clamping plate of a freeze-thaw model box
FIG. 6 is a side view of a freeze-thaw cassette
FIG. 7 is a schematic view showing the positions of a water separator on the side wall of a mold box, a freezing pipe and a reserved hole of a tunnel mold pipe
FIG. 8 is a schematic view of the test system operating frozen soil curtain diffusion
FIG. 9 is a schematic view of a freeze-thaw model box methane-frozen soil simulation interface
Digital tag annotation:
the temperature measurement system comprises a temperature measurement system 1, a temperature measurement instrument 101, a lead 102, a temperature measurement probe 103, a freeze-thaw model box 2, a steel splint 201, a freezing pipe reserved hole 202, a tunnel model pipe reserved hole 203, a model box cover 7, a rubber sealing ring 701, a methane simulation system reserved hole 702, a temperature measurement system reserved hole 703, a refrigeration system 3, freezing liquid 301, a freezing liquid outer hose 302, a freezing pipe 303, a water distributor 304, a refrigerator 305, a soil body 4, a methane simulation system 5, a methane pipe 501, a pressurization pipe 502, pressure-bearing gas 503, a double-layer air bag 504, an outer bag 5041, an inner bag 5042, methane 505, a pressure-bearing valve 506, a methane aerostatic press 507, a tunnel model pipe 6, frozen soil 8 and a methane-frozen soil simulation interface 9.
Detailed Description
The drawings in the present application are in simplified form and are not to scale, but rather are provided for convenience and clarity in describing the embodiments of the present application and are not intended to limit the scope of the application. Any modification of the structure, change of the ratio or adjustment of the size of the structure should fall within the scope of the technical disclosure of the present application without affecting the effect and the purpose of the present application. And the same reference numbers appearing in the various drawings of the present application designate the same features or components, which may be employed in different embodiments.
It should be noted that the embodiments of the present application have a better implementation and are not intended to limit the present application in any way. The technical features or combinations of technical features described in the embodiments of the present application should not be considered as being isolated, and they may be combined with each other to achieve a better technical effect. The scope of the preferred embodiments of this application may also include additional implementations, and this should be understood by those skilled in the art to which the embodiments of this application pertain.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
The following is a description of the preferred embodiments of the present application.
As shown in fig. 1, the subway communication channel freezing method construction interface simulation test system passing through a methane-containing stratum is characterized by comprising a temperature measurement system 1, a freezing and thawing model box 2, a refrigeration system 3, a soil body 4, a methane simulation system 5 and a tunnel model pipe 6; the freezing and thawing model box 2 comprises two steel clamping plates 201 and a model box cover 7. The two steel clamping plates 201 are arranged in the freeze-thaw model box 2 at intervals, and the freeze-thaw model box 2 is divided into A, B, C three chambers; the B, C two chambers are covered by a model box cover 7. The chamber A is not provided with the methane simulation system 5, the chamber B, C is provided with the methane simulation system 5, the distance from the methane release point of the methane simulation system 5 in the chamber B, C to the axis of the tunnel model pipe 6 is different, and the A, B, C chambers form a test control group. The biogas simulation system 5 is arranged in B, C two chambers to provide a biogas test environment during freezing.
The freeze-thaw model box 2 is a test box body, and a soil body 4 is contained in the freeze-thaw model box. The freeze-thaw model box 2 comprises two steel clamping plates 201 and a model box cover 7; the two steel clamping plates 201 are longitudinally installed in the freeze-thaw model box 2 at intervals, and the freeze-thaw model box 2 is divided into A, B, C three chambers; a model box cover 7 is covered above the B, C two chambers for preventing the biogas from overflowing. As shown in fig. 4, the model box cover 7 includes a rubber sealing ring 701, a biogas simulation system preformed hole 702, and a temperature measurement system preformed hole 703. The preformed hole 702 of the biogas simulation system is a preformed hole through which the biogas pipe 501 passes through the model box cover 7; a rubber sealing ring 701 is arranged between the biogas pipe 501 and the model box cover 7; the temperature measurement system preformed hole 703 is a preformed hole through which the lead 102 passes through the model box cover 7; at the lower parts of the B, C two chambers and the position corresponding to the model box cover 7 in the longitudinal direction, the freeze-thaw model box 2 is also provided with a methane simulation system preformed hole 702; a rubber sealing ring 701 is arranged between the biogas pipe 501 and the freeze-thaw model box 2; as shown in fig. 5, the steel splint 201 includes a freezing tube preformed hole 202 and a tunnel mold tube preformed hole 203; the freezing pipe reserved hole 202 is a reserved hole for enabling a freezing pipe 303 to penetrate through the steel clamping plate 201; the tunnel mold type pipe reserved hole 203 is a reserved hole for the tunnel mold type pipe 6 to penetrate through the steel clamping plate 201.
As shown in fig. 6 and 7, the refrigeration system 3 includes a freezing liquid 301, a plurality of freezing liquid outer hoses 302, a plurality of freezing pipes 303, 2 water separators 304, and a refrigerator 305. The refrigerator 305 is used to control the temperature and flow rate of the freezing liquid 301. The freezing liquid outer hose 302 is connected with a water separator 304 and a refrigerator 305; the two water distributors 304 are respectively arranged on two side surfaces in the freeze-thaw model box 2 and are respectively used for shunting and converging the freezing liquid 301; the freezing pipes 303 are connected with the water separator 304, and the divided freezing liquid 301 flows into the freezing pipes 303 respectively; with the tunnel mold pipe 6 as an axis, the freezing pipes 303 are parallel to the tunnel mold pipe 6, meanwhile, the freezing pipes 303 are uniformly distributed around the tunnel mold pipe 6, and the freezing area and the freezing interface of the tunnel mold pipe 6 are formed by the freezing liquid 301 flowing in each freezing pipe 303 of the refrigerating system 3. The freezing liquid 301 flows out of the refrigerator 305, passes through the freezing liquid outer hose 302, the water separator 304 and the freezing pipe 303, and finally flows back into the refrigerator 305, so that a freezing cycle is completed.
The temperature measurement system 1 comprises a temperature measurement instrument 101, a lead 102 and a plurality of temperature measurement probes 103; the temperature measuring instrument 101 is arranged outside the freeze-thaw model box 2; the plurality of temperature measuring probes 103 are connected with a temperature measuring instrument 101 through leads 102; the temperature measuring instrument 101 is used for receiving and displaying temperature measuring data of the plurality of temperature measuring probes 103; in the axial temperature measurement system 1 distributed in A, B, C three cavities, temperature measurement probes are distributed at different radiation distances on a plurality of radial temperature measurement probes 103 by taking the tunnel model tube 6 as an axis, and the temperature at different positions is measured.
As shown in fig. 2 and 3, the biogas simulation system 5 includes a biogas pipe 501, a pressurization pipe 502, a pressure-bearing gas 503, a double-layer airbag 504, biogas 505, a pressure-bearing valve 506, and a biogas air compressor 507; the double-layer air bag 504 comprises an outer bag 5041 and an inner bag 5042, wherein the outer bag 5041 is in a fishing net shape; one end of the biogas pipe 501 is connected with a biogas air compressor 507, and the other end is connected with an outer bag 5041 and used for conveying biogas 505. One end of the pressurizing pipe 502 is connected with the methane gas compressor 507, and the other end is connected with the inner bag 5042 and used for conveying the pressure-bearing gas 503. The pressure-bearing valve 506 is located at the joint of the biogas pipe 501, the pressurization pipe 502 and the biogas compressor 507, and is used for preventing the pressure-bearing gas 503 from flowing back into the biogas compressor 507 at the pressure-bearing stage. The pressurized gas 503, mainly composed of inert gas, is filled into the inner bag 5042 of the double-layer air bag 504 by the pressurizing pipe 502 before filling the freeze-thaw model box 2 with soil, and is used for bearing the pressure of the surrounding soil. When the test starts, the inner-layer air bag discharges pressure-bearing gas 503 for pressure relief, and simultaneously the methane pipe 501 conveys methane 505 to the outer air bag for pressurization, so as to support the surrounding soil body. The biogas 501 comes out of the holes of the outer bag and directly contacts the surrounding soil. After all the gas in the inner bag is discharged, the soil cave is filled with biogas 505, and the storage form of the biogas in the simulated formation is in a ball shape.
The tunnel model pipe 6 penetrates through the tunnel model pipe reserved hole 203, and then two ends of the tunnel model pipe are fixed on the inner wall of the freeze-thaw model box 2, so that the subway communication channel in reality can be simulated.
To better illustrate the frozen soil range, frozen soil 8 and a biogas-frozen soil simulation interface 9 are introduced.
As shown in fig. 9, the frozen soil 8 is frozen soil formed by freezing the soil 4 around the tunnel mold pipe 6 by the freezing pipe 303 of the refrigeration system 3.
As shown in fig. 8, furthermore, a frozen soil curtain is formed on a circle outside the tunnel model pipe 6, and a methane-frozen soil simulation interface 9 is formed with the methane simulation system 5, namely, the interface between the frozen soil 8 and the methane under the condition of methane.
Example 1
The structure and application of the subway communication channel freezing method construction interface simulation test system penetrating through the methane-containing stratum are as follows:
the outer diameter of the freeze-thaw model box 2 is 3000mm multiplied by 1000mm, the freeze-thaw model box is divided into three ABC areas along the longitudinal direction, and the three ABC areas are separated by steel clamping plates 201 to form three independent chambers.
According to two basic similarity criteria of geometric similarity and material similarity of a civil engineering model test, a tunnel model pipe 6 with the outer diameter of 10cm and the wall thickness of 5mm is adopted in the test. The tunnel model pipe 6 is put into the freeze-thaw model box 2 from the tunnel model reserved hole 203 on the side wall, passes through the tunnel model reserved hole 203 on the steel splint 201, and reaches the reserved hole on the other side wall, so that the tunnel model pipe penetrates through the whole model box.
Above the B, C chamber, the mould cover 7 is closed. The lead 102 of the temperature measuring system 1, the biogas pipe 501 of the biogas simulation system 5 and the pressurizing pipe 502 respectively penetrate through the temperature measuring system preformed hole 703 and the biogas simulation system preformed hole 702 on the cover.
After the mold box cover 7 is closed, the pressure of the pressurized gas 503 discharged from the inner bladder through the pressurizing pipe 502 is released, and the biogas compressor 507 delivers biogas 505 to the outer bladder of the double bladder through the biogas pipe 501. Because the outer air bag is in the shape of a fishing net, the marsh gas 501 flows out of the holes of the outer air bag and directly contacts with the surrounding soil. After all the gas in the inner bag is discharged, the pressurizing pipe 502 is closed, and the flow of the biogas in the biogas pipe 501 is reduced. The soil cavern is filled with biogas 505, simulating the storage form of the biogas in the stratum in a ball shape.
The refrigerating system 3 operates with the arrangement of the rings of the freezing pipes 303 as a center ring to form the cylindrical frozen soil 8 with a certain thickness. In the B, C chamber of the freeze-thaw model box 2, the frozen soil is in contact with the biogas to form a biogas-frozen soil simulation interface 9.
Claims (1)
1. A subway communication channel freezing method construction interface simulation test system penetrating through a methane-containing stratum is characterized by comprising a temperature measurement system (1), a freezing and thawing model box (2), a refrigeration system (3), a soil body (4), a methane simulation system (5) and a tunnel model pipe (6); the freeze-thaw model box (2) comprises two steel clamping plates (201) and a model box cover (7); the two steel clamping plates (201) are arranged in the freeze-thaw model box (2) at intervals, and the freeze-thaw model box (2) is divided into A, B, C three chambers; a model box cover (7) is covered above the B, C two chambers; the chamber A is not provided with a methane simulation system (5), the chamber B, C is provided with the methane simulation system (5), the distance from a methane release point of the methane simulation system (5) in the chamber B, C to the axis of the tunnel model pipe (6) is different, and the A, B, C chambers form a test control group; the biogas simulation system (5) is arranged in the B, C two chambers and provides a biogas test environment in the freezing process;
the refrigerating system (3) comprises freezing liquid (301), a plurality of freezing liquid outer hoses (302), a plurality of freezing pipes (303), 2 water distributors (304) and a refrigerator (305); the refrigerator (305) is used for manufacturing and conveying a freezing liquid (301); the freezing liquid outer hose (302) is connected with the water separator (304) and the refrigerator (305); the water segregator (304) is arranged on two side faces in the freeze-thaw model box (2) and is used for shunting and converging freezing liquid (301) respectively; the freezing pipes (303) are connected with the water separator (304), and the shunted freezing liquid (301) flows into the freezing pipes (303) respectively; with the tunnel mold pipe (6) as an axis, the freezing pipes (303) are parallel to the tunnel mold pipe (6), meanwhile, the freezing pipes (303) are uniformly distributed around the tunnel mold pipe (6), and the refrigerating system (3) forms a freezing area and a freezing interface of the tunnel mold pipe (6) through freezing liquid (301) flowing in each freezing pipe (303);
the temperature measurement system (1) comprises a temperature measurement instrument (101), a lead (102) and a plurality of temperature measurement probes (103); the temperature measuring instrument (101) is arranged outside the freeze-thaw model box (2); the plurality of temperature measuring probes (103) are connected with the temperature measuring instrument (101) through leads (102); the temperature measuring instrument (101) is used for receiving and displaying temperature measuring data of the plurality of temperature measuring probes (103); in the axial temperature measurement system 1 distributed in A, B, C three cavities, temperature measurement probes are distributed at different radiation distances on a plurality of radial temperature measurement probes (103) by taking the tunnel model tube (6) as an axis, and the temperatures at different positions are measured;
the biogas simulation system (5) comprises a biogas pipe (501), a pressurizing pipe (502), pressure-bearing gas (503), a double-layer airbag (504), biogas (505), a pressure-bearing valve (506) and a biogas air compressor (507); the double-layer air bag (504) comprises an outer bag (5041) and an inner bag (5042), wherein the outer bag (5041) is in a fishing net shape; one end of the biogas pipe (501) is connected with a biogas air compressor (507), and the other end is connected with an outer bag (5041) and used for conveying biogas (505); one end of the pressurizing pipe (502) is connected with the biogas air compressor (507), and the other end of the pressurizing pipe is connected with the inner bag (5042) and is used for conveying pressure-bearing gas (503); the pressure-bearing valve (506) is positioned at the joint of the biogas pipe (501), the pressurizing pipe (502) and the biogas air compressor (507) to prevent the backflow of biogas and pressure-bearing gas; the biogas is released into the soil body (4) through the outer bag (5041), the double-layer air bag (504) shrinks after releasing the biogas, and a biogas cluster is formed at the position of the original double-layer air bag (504) and is used for simulating geological soil body containing the biogas;
the tunnel model pipe (6) is arranged in the freeze-thawing model box (2), and both ends of the tunnel model pipe are fixed on the inner wall of the freeze-thawing model box (2) after passing through the steel clamping plate (201) and are used for simulating a subway communication channel in reality.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122181488.0U CN216043717U (en) | 2021-09-09 | 2021-09-09 | Subway communication channel freezing method construction interface simulation test system for traversing methane-containing stratum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122181488.0U CN216043717U (en) | 2021-09-09 | 2021-09-09 | Subway communication channel freezing method construction interface simulation test system for traversing methane-containing stratum |
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| CN216043717U true CN216043717U (en) | 2022-03-15 |
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| CN202122181488.0U Expired - Fee Related CN216043717U (en) | 2021-09-09 | 2021-09-09 | Subway communication channel freezing method construction interface simulation test system for traversing methane-containing stratum |
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