CN112302682A - Self-adaptive pressure-regulating flexible supporting device suitable for large deformation of tunnel and mounting method - Google Patents
Self-adaptive pressure-regulating flexible supporting device suitable for large deformation of tunnel and mounting method Download PDFInfo
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- CN112302682A CN112302682A CN202011128874.7A CN202011128874A CN112302682A CN 112302682 A CN112302682 A CN 112302682A CN 202011128874 A CN202011128874 A CN 202011128874A CN 112302682 A CN112302682 A CN 112302682A
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- 230000008093 supporting effect Effects 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 153
- 239000011435 rock Substances 0.000 claims abstract description 49
- 238000009434 installation Methods 0.000 claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 7
- 230000003044 adaptive effect Effects 0.000 claims description 17
- 238000002347 injection Methods 0.000 claims description 15
- 239000007924 injection Substances 0.000 claims description 15
- 238000005192 partition Methods 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 7
- 238000009412 basement excavation Methods 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 3
- 238000011900 installation process Methods 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims 1
- 230000006835 compression Effects 0.000 description 6
- 238000007906 compression Methods 0.000 description 6
- 239000000243 solution Substances 0.000 description 5
- 238000001125 extrusion Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011378 shotcrete Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000008961 swelling Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004746 geotextile Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/05—Lining with building materials using compressible insertions
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/003—Linings or provisions thereon, specially adapted for traffic tunnels, e.g. with built-in cleaning devices
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Mechanical Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention relates to a self-adaptive pressure-regulating flexible supporting device suitable for large deformation of a tunnel and an installation method, wherein the device comprises the following components: the device comprises a surrounding rock base, a primary support, a water bag, a supporting pile and a secondary lining, wherein the surrounding rock base is arranged at the bottom of the tunnel; the primary support is arranged on the inner wall of the tunnel; the second liner is arranged on the surrounding rock base; the water bag is arranged between the primary support and the secondary lining, and two ends of the water bag abut against the surrounding rock base after the water bag is filled with filling liquid; the supporting pile is arranged at the end part of the water bag, one end of the supporting pile is inserted into and fixed on the surrounding rock base, and the other end of the supporting pile is fixed on the second lining and used for fixing the second lining; the surrounding rock base, the primary support, the water bag and the two linings are all arranged longitudinally along the tunnel. The device can arrange water bags between the second lining of the tunnel and surrounding rocks according to the actual requirements of the engineering, and provides different support stresses for the tunnel engineering by setting different water pressures; and the constant of the water pressure value in the water bag in the large deformation process of the tunnel is realized through the pressure relief valve on the water bag, and the safety of the second lining of the tunnel is ensured.
Description
Technical Field
The invention relates to the technical field of tunnel engineering, in particular to a self-adaptive pressure-regulating flexible supporting device suitable for large deformation of a tunnel and an installation method.
Background
Tunnel engineering often passes through a plurality of bad strata, such as weak surrounding rocks, fault zones and the like, and is easy to suffer from large extrusion deformation and large crushing and swelling deformation during construction and operation, thereby causing great challenges to the safety of the tunnel engineering.
At present, the internationally popular tunnel support scheme still mainly uses the combined support of the shotcrete, the anchor rod and the steel arch, and when the tunnel is subjected to large deformation such as extrusion, crushing and expansion, rigid support schemes such as increasing the thickness of the shotcrete and increasing the density or rigidity of the steel arch are often adopted. However, the rigid support has small allowable deformation and high construction cost, once the rigid support is damaged, the rigid support cannot control the deformation of the surrounding rock any more, and the rigid support is influenced by the uneven and large deformation of the surrounding rock, so that the supporting scheme easily causes the lining structure to bear adverse bias load, and seriously harms the safety of the lining structure.
Various flexible yielding supports at home and abroad have certain effects in large deformation such as tunnel extrusion, crushing and expansion, but the prior art can not meet the requirements in three aspects of high bearing capacity, large deformation and load stability, and the lining structure is easy to be in a bias stress state.
Disclosure of Invention
The application provides a self-adaptive pressure-regulating flexible supporting device suitable for large deformation of a tunnel and an installation method, and solves or partially solves the technical problem that the prior art cannot meet requirements in three aspects of high bearing capacity, large deformation and load stability; the requirement on three aspects of high bearing capacity, large deformation and load stability can be well met, the stability of the tunnel is guaranteed to the maximum extent, high surrounding rock stress can be borne, and the bias load which is not beneficial to the stress of the lining structure is avoided being borne.
The application provides a flexible supporting device of self-adaptation pressure suitable for tunnel large deformation includes: a surrounding rock base, a primary support, a water bag, a supporting pile and a secondary lining, wherein,
the surrounding rock base is arranged at the bottom in the tunnel;
the primary support is arranged on the inner wall of the tunnel;
the second liner is arranged on the surrounding rock base;
the water bag is arranged between the primary support and the secondary lining, and two ends of the water bag abut against the surrounding rock base after the water bag is filled with filling liquid;
the supporting piles are arranged at the end parts of the water bags, one ends of the supporting piles penetrate into and are fixed on the surrounding rock base, the other ends of the supporting piles are fixed on the two liners, and the supporting piles are used for fixing the two liners;
the surrounding rock base, the primary support, the water bag and the two linings are all arranged longitudinally along the tunnel.
Preferably, the surrounding rock base, the primary support and the contact part of the secondary lining and the water sac are all filled with flexible materials.
Preferably, the tunnel can be provided with a plurality of the self-adaptive pressure-regulating flexible supporting devices in a segmented manner along the longitudinal direction, a partition is arranged between the adjacent self-adaptive pressure-regulating flexible supporting devices, and the supporting piles are located at the partition positions.
Preferably, the water bag is provided with a water filling port and a pressure water outlet for filling and discharging filling liquid into and from the water bag; a pressure relief valve is arranged on the pressure-bearing water outlet; and water injection holes are arranged on the two liners corresponding to the water injection ports, and drain holes are arranged corresponding to the pressurized drain outlets.
Preferably, the tunnel comprises a plurality of pressurized water outlets which are symmetrically arranged along the transverse section of the tunnel respectively; the water injection port is arranged on the water sac at a position corresponding to the arch crown of the tunnel.
Preferably, the water bag is further provided with a water pressure gauge.
Preferably, the two linings are provided with access doors.
Based on the same inventive concept, the application also provides an installation method of the self-adaptive pressure-regulating flexible supporting device suitable for large deformation of the tunnel, which comprises the following steps:
the method comprises the following steps: excavating the tunnel, reserving the surrounding rock base, and constructing the primary support along the primary support part of the tunnel; the supporting piles are installed according to the set partition intervals along with the excavation of the tunnel face;
step two: pulling and horizontally placing the water bag which is not filled with water at a designed position between the primary support and the secondary lining;
step three: closing the pressurized water outlet, and injecting water into the water bag through the water injection port;
step four: and after the water bag is filled with water to a preset pressure, building the two linings, after the two linings are built, continuing filling water to increase the water pressure in the water bag to a specified pressure, and finishing the installation of the self-adaptive pressure-regulating flexible supporting device.
Preferably, when a plurality of the adaptive compression flexible supporting devices need to be installed, after the two linings of the previous adaptive compression flexible supporting device are built, partition setting is performed, the first step, the second step and the fourth step are sequentially repeated according to the longitudinal length of the tunnel and the excavation footage, and the installation of the next adaptive compression flexible supporting device is completed.
Preferably, during installation, a flexible material is filled in the contact parts of the water bag, the surrounding rock base, the primary support and the secondary liner;
and when the step two is finished, two ends of the water bag are abutted to the surrounding rock base, and the pressed water outlet and the water injection port are fixed through temporary supports.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
according to the method, the water bag can be arranged between the second lining of the tunnel and the surrounding rock according to the actual requirements of the engineering, and different support stresses are provided for the tunnel engineering by setting different water pressures; and the constant of the water pressure value in the water bag in the large deformation process of the tunnel is realized through the pressure relief valve on the water bag, and the safety of the second lining of the tunnel is ensured. Therefore, the flexible device can guarantee the stability of the tunnel to the maximum extent, can bear higher surrounding rock stress, and avoids the lining structure from bearing unfavorable bias load.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic transverse cross-sectional view of an adaptive compression flexible supporting device provided in an embodiment of the present application;
fig. 2 is a schematic vertical longitudinal cross-section of an adaptive compression flexible supporting device provided in an embodiment of the present application;
fig. 3 is a schematic horizontal longitudinal cross-section of an adaptive compression flexible supporting device provided in an embodiment of the present application;
fig. 4 is a schematic flow chart of an installation method of an adaptive pressure-adaptive flexible supporting device according to an embodiment of the present application.
(in the figure, the parts represented by the reference numerals are 1 primary support, 2 water bags, 3 pressure water outlets, 4 water filling ports, 5 secondary linings, 6 surrounding rock bases, 7 access doors, 8 partitions, 9 pressure discharge valves, 10 water pressure meters and 11 supporting piles in sequence)
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to the accompanying drawings 1-3, the self-adaptive pressure-adaptive flexible supporting device suitable for large deformation of a tunnel provided by the application comprises: the tunnel comprises a surrounding rock base 6, a primary support 1, a water bag 2, a support pile 11 and a secondary lining 5, wherein the surrounding rock base 6 is arranged at the bottom of the tunnel; the primary support 1 is arranged on the inner wall of the tunnel; the second liner 5 is arranged on the surrounding rock base 6; the water bag 2 is arranged between the primary support 1 and the secondary lining 5, and two ends of the water bag 2 abut against the surrounding rock base 6 after being filled with filling liquid; the supporting piles are arranged at the end parts of the water bags, one ends of the supporting piles penetrate into and are fixed on the surrounding rock base 6, the other ends of the supporting piles are fixed on the two liners 5, and the supporting piles 11 are used for fixing the two liners 5; the surrounding rock base 6, the primary support 1, the water bag 2 and the two linings 5 are all arranged along the longitudinal direction of the tunnel.
Furthermore, the contact positions of the surrounding rock base 6, the primary support 1, the secondary lining 5 and the water bag 2 are filled with flexible materials, so that each contact position is smooth and flat as much as possible, the phenomenon that the sharp part of the primary support of the tunnel damages the water bag 2 is avoided, and the flexible materials can adopt asbestos, geotextile and the like and are used for protecting the water bag and avoiding being punctured by sharp stones or rocks.
The tunnel can be provided with a plurality of self-adaptive pressure-regulating flexible supporting devices in a segmented manner along the longitudinal direction, a partition 8 is arranged between adjacent self-adaptive pressure-regulating flexible supporting devices, and a supporting pile 11 is positioned at the position of the partition 8; as an optimal embodiment, the length of each self-adaptive pressure-regulating flexible supporting device can be set to be 2-3 m, the proper length can ensure the supporting strength and the supporting effect, and the difficulty in construction and installation and difficulty in troubleshooting of equipment caused by overlong length can be avoided.
The water bag 2 can be made of thick-wall rubber, and the allowable deformation can be set according to the limit value of extrusion large deformation or crushing swelling deformation preset in engineering design.
The water bag 2 is provided with a water filling port 4 and a pressure water outlet 3 which are used for filling and discharging filling liquid into the water bag 2; a pressure relief valve 9 is arranged on the pressure-bearing water outlet 3; the two liners 5 are provided with water injection holes corresponding to the water injection ports 4 and drain holes corresponding to the pressurized water discharge ports 3. The tunnel comprises a plurality of pressure water outlets 3, specifically 4 pressure water outlets, which are respectively and symmetrically arranged along the transverse section of the tunnel; the water injection port 4 is arranged on the water sac 2 at a position corresponding to the arch crown of the tunnel. The water bag 2 is also provided with a water pressure gauge 10.
When the tunnel surrounding rock is greatly deformed, the surrounding rock deforms and extrudes the water bag 2, so that the water pressure in the water bag 2 is increased; meanwhile, after the water pressure in the water bag 2 rises, the water in the water bag 2 passes through the pressure discharge valve 9 and is subjected to pressure to discharge the water from the water outlet 3, and partial water is discharged, so that the water pressure in the water bag 2 is reduced to an initial set water pressure value, and the stress safety of the secondary lining 5 is guaranteed; the water pressure measuring meter 10 can check the water pressure value in the water bag 2 in real time, so that whether the pressure outlet 3 and the pressure discharge valve 9 are smooth or not can be judged, and water can be supplemented or discharged into the water bag 2.
Furthermore, the two liners 5 are provided with an access door 7, and when the water bag 2, the pressurized water outlet 3 and the water filling port 4 are monitored to be in trouble, the water bag can be accessed through the access door 7 for maintenance.
The flexible device can better meet the requirements of high bearing capacity, large deformation and stable load. Meanwhile, the device can arrange a thick-wall rubber water bag between the second lining of the tunnel and the surrounding rock according to the actual requirements of the engineering, and provide different support stresses for the tunnel engineering by setting different water pressures; and the constant of the water pressure value in the water bag in the large deformation process of the tunnel is realized through the pressure relief valve on the water bag, and the safety of the second lining of the tunnel is ensured. Therefore, the flexible device can guarantee the stability of the tunnel to the maximum extent, can bear higher surrounding rock stress, and avoids the lining structure from bearing unfavorable bias load.
Based on the same inventive concept, the application also provides an installation method of the self-adaptive pressure-regulating flexible supporting device suitable for large deformation of the tunnel, and the installation method is shown in the attached figure 4 and comprises the following steps:
the method comprises the following steps: excavating the tunnel, reserving a surrounding rock base 6, and constructing a primary support 1 along a primary support part of the tunnel; installing supporting piles 11 according to the set interval of the partition 8 along with the excavation of the tunnel face;
step two: the water bag 2 which is not filled with water is pulled and placed at a designed position between the primary support 1 and the secondary lining 5;
step three: the pressure water outlet 3 is closed, and water is injected into the water bag 2 through the water injection port 4;
step four: and after the water bag 2 is filled with water to a certain preset pressure, building the second liner 5, after the building of the second liner 5 is finished, continuing filling water to increase the water pressure in the water bag to a specified pressure, and finishing the installation of the self-adaptive pressure-regulating flexible supporting device.
Further, when a plurality of self-adaptive pressure-regulating flexible supporting devices need to be installed, after the second lining 5 of the previous self-adaptive pressure-regulating flexible supporting device is built, the partition 8 is arranged, the first step, the second step and the third step are sequentially repeated according to the longitudinal length of the tunnel and the excavation footage, and the installation of the next self-adaptive pressure-regulating flexible supporting device is completed.
In the installation process, the flexible material is filled in the contact parts of the water bag 2, the surrounding rock base 6, the primary support 1 and the secondary liner 5; and when the step two is finished, two ends of the water bag 2 are abutted to the surrounding rock base 6, and the pressed water outlet 3 and the water injection port 4 are fixed through temporary support.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only illustrative of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a flexible supporting device of self-adaptation pressure regulating suitable for tunnel large deformation which characterized in that includes: a surrounding rock base, a primary support, a water bag, a supporting pile and a secondary lining, wherein,
the surrounding rock base is arranged at the bottom of the tunnel;
the primary support is arranged on the inner wall of the tunnel;
the second liner is arranged on the surrounding rock base;
the water bag is arranged between the primary support and the secondary lining, and two ends of the water bag abut against the surrounding rock base after the water bag is filled with filling liquid;
the supporting piles are arranged at the end parts of the water bags, one ends of the supporting piles penetrate into and are fixed on the surrounding rock base, the other ends of the supporting piles are fixed on the two liners, and the supporting piles are used for fixing the two liners;
the surrounding rock base, the primary support, the water bag and the two linings are all arranged longitudinally along the tunnel.
2. The adaptive pressure-adaptive flexible supporting device suitable for large deformation of a tunnel according to claim 1, wherein the surrounding rock base, the primary support and the contact part of the secondary liner and the water sac are all filled with flexible materials.
3. The adaptive pressure-adaptive flexible supporting device suitable for large deformation of a tunnel according to claim 1, wherein a plurality of adaptive pressure-adaptive flexible supporting devices are arranged along a longitudinal section of the tunnel, a partition is arranged between every two adjacent adaptive pressure-adaptive flexible supporting devices, and the supporting piles are located at the partition positions.
4. The adaptive pressure-adaptive flexible supporting device suitable for large deformation of a tunnel according to claim 1, wherein the water sac is provided with a water filling port and a pressure water outlet for filling and discharging filling liquid into and from the water sac; a pressure relief valve is arranged on the pressure-bearing water outlet; and water injection holes are arranged on the two liners corresponding to the water injection ports, and drain holes are arranged corresponding to the pressurized drain outlets.
5. The adaptive pressure-adaptive flexible supporting device suitable for large tunnel deformation of claim 4, which comprises a plurality of the pressure-bearing water outlets which are symmetrically arranged along the transverse section of the tunnel respectively; the water injection port is arranged on the water sac at a position corresponding to the arch crown of the tunnel.
6. The adaptive pressure-adaptive flexible supporting device suitable for large deformation of tunnels as claimed in claim 1, wherein the water sac is further provided with a water pressure gauge.
7. The adaptive pressure-adaptive flexible supporting device suitable for large deformation of a tunnel according to claim 1, wherein the two linings are provided with access doors.
8. An installation method of an adaptive pressure-adaptive flexible supporting device suitable for large deformation of a tunnel according to any one of claims 1 to 7, which is characterized by comprising the following steps of:
the method comprises the following steps: excavating the tunnel, reserving the surrounding rock base, and constructing the primary support along the primary support part of the tunnel; the supporting piles are installed according to the set partition intervals along with the excavation of the tunnel face;
step two: pulling and horizontally placing the water bag which is not filled with water at a designed position between the primary support and the secondary lining;
step three: closing the pressurized water outlet, and injecting water into the water bag through the water injection port;
step four: and after the water bag is filled with water to a preset pressure, building the two linings, after the two linings are built, continuing filling water to increase the water pressure in the water bag to a specified pressure, and finishing the installation of the self-adaptive pressure-regulating flexible supporting device.
9. The method for installing self-adaptive pressure-adaptive flexible supporting devices suitable for large deformation of tunnels according to claim 8, wherein when a plurality of self-adaptive pressure-adaptive flexible supporting devices are required to be installed, after the two linings of the former self-adaptive pressure-adaptive flexible supporting device are built, partition setting is carried out, the steps from the first step to the fourth step are sequentially repeated according to the longitudinal length of the tunnel and the excavation footage, and the installation of the latter self-adaptive pressure-adaptive flexible supporting device is completed.
10. The method for installing an adaptive pressure-adaptive flexible supporting device suitable for large deformation of a tunnel according to claim 8,
in the installation process, a flexible material is filled in the contact positions of the water bag, the surrounding rock base, the primary support and the secondary liner;
and when the step two is finished, two ends of the water bag are abutted to the surrounding rock base, and the pressed water outlet and the water injection port are fixed through temporary supports.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011128874.7A CN112302682A (en) | 2020-10-20 | 2020-10-20 | Self-adaptive pressure-regulating flexible supporting device suitable for large deformation of tunnel and mounting method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011128874.7A CN112302682A (en) | 2020-10-20 | 2020-10-20 | Self-adaptive pressure-regulating flexible supporting device suitable for large deformation of tunnel and mounting method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113982631A (en) * | 2021-10-29 | 2022-01-28 | 成都未来智隧科技有限公司 | Tunnel supporting structure and tunnel supporting method |
| CN113982627A (en) * | 2021-10-29 | 2022-01-28 | 成都未来智隧科技有限公司 | Tunnel supporting method and tunnel supporting structure |
| CN115452219A (en) * | 2022-08-24 | 2022-12-09 | 珠海大横琴股份有限公司 | Two-lining contact pressure testing device and mounting method thereof |
-
2020
- 2020-10-20 CN CN202011128874.7A patent/CN112302682A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113982631A (en) * | 2021-10-29 | 2022-01-28 | 成都未来智隧科技有限公司 | Tunnel supporting structure and tunnel supporting method |
| CN113982627A (en) * | 2021-10-29 | 2022-01-28 | 成都未来智隧科技有限公司 | Tunnel supporting method and tunnel supporting structure |
| CN113982631B (en) * | 2021-10-29 | 2024-04-05 | 成都未来智隧科技有限公司 | Tunnel supporting structure and tunnel supporting method |
| CN113982627B (en) * | 2021-10-29 | 2024-04-05 | 成都未来智隧科技有限公司 | Tunnel supporting method and tunnel supporting structure |
| CN115452219A (en) * | 2022-08-24 | 2022-12-09 | 珠海大横琴股份有限公司 | Two-lining contact pressure testing device and mounting method thereof |
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