CN212459320U - Tunnel excavation off-load country rock infiltration test device under different stress conditions - Google Patents
Tunnel excavation off-load country rock infiltration test device under different stress conditions Download PDFInfo
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- CN212459320U CN212459320U CN202021158775.9U CN202021158775U CN212459320U CN 212459320 U CN212459320 U CN 212459320U CN 202021158775 U CN202021158775 U CN 202021158775U CN 212459320 U CN212459320 U CN 212459320U
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- true triaxial
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- 238000012360 testing method Methods 0.000 title claims abstract description 47
- 238000009412 basement excavation Methods 0.000 title claims abstract description 29
- 239000011435 rock Substances 0.000 title claims abstract description 28
- 230000008595 infiltration Effects 0.000 title claims abstract description 15
- 238000001764 infiltration Methods 0.000 title claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 86
- 238000007789 sealing Methods 0.000 claims abstract description 38
- 238000002347 injection Methods 0.000 claims abstract description 26
- 239000007924 injection Substances 0.000 claims abstract description 26
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 239000011148 porous material Substances 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 abstract description 12
- 238000003825 pressing Methods 0.000 abstract 3
- 238000000034 method Methods 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 238000011160 research Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000009933 burial Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 230000003204 osmotic effect Effects 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
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Abstract
The utility model discloses a tunnel excavation unloading surrounding rock seepage test device under different stress conditions, which comprises a true triaxial pressure chamber, a pressure loading unit, a high-pressure water injection unit and a seepage water collecting unit; the true triaxial pressure chamber comprises a true triaxial cavity body, four confining pressure plates which are arranged in the true triaxial cavity body in a rectangular mode, confining pressure actuators which are arranged on the true triaxial cavity body and are used for applying pressure to the four confining pressure plates respectively, two sealing discs which are located at two ends of the four confining pressure plates, an axial pressure plate which is used for applying pressure to the sealing discs, an axial pressure actuator which is arranged on the true triaxial cavity body and is used for applying pressure to the two sealing discs respectively, and a rubber sleeve which is used for being arranged in an inner hole of an experimental test piece. Through the utility model discloses carry out tunnel excavation off-load country rock infiltration experiment under the different stress condition, can more accurately master tunnel excavation off-load stress variation and infiltration mechanism under the different pressure, solved prior art and can't exert confined pressure, axle load and interior pressure condition simultaneously and carry out the technical problem that the tunnel infiltration was studied.
Description
Technical Field
The utility model relates to an underground works excavation technical field, concretely relates to tunnel excavation off-load country rock infiltration test device under different stress condition for simulation tunnel excavation off-load stress variation and infiltration experiment.
Background
With the rapid development of deep geotechnical engineering, underground caverns or tunnels begin to develop to depth, and show the trends of high buried depth, high ground stress and high osmotic pressure. When the tunnel is excavated, the original rock stress of the excavated surface is released completely or partially, the original mechanical balance state is destroyed, and the rock stress is redistributed, so that the deformation of surrounding rocks is influenced.
At present, a series of indoor simulation experiments, such as a conventional triaxial test, a true triaxial test and the like, are developed by a plurality of scholars aiming at tunnel excavation unloading. The experimental test piece is mostly selected from a cubic or cylindrical rock sample, and tunnel excavation unloading is simulated through schemes of unloading confining pressure, increasing axial pressure or unloading confining pressure and axial pressure simultaneously. Engineering practice shows that certain difference exists between the stress state change of the surrounding rock during the stress excavation unloading path and tunnel excavation. The tunneling of the tunnel is shown as rapid unloading, and the excavation unloading is followed by supporting and lining to form a hollow cylinder, and meanwhile, only an unloading path is researched in the current indoor simulation excavation unloading experiment, but the problem of surrounding rock water seepage after the tunnel is unloaded in different stress states is not considered.
Therefore, the experimental device is necessary to be established to simulate and research the tunnel excavation unloading stress change and the surrounding rock water seepage mechanism under different stress conditions, and the surrounding rock damage deformation and the water seepage path diameter of the 6 surfaces of the tunnel under different stresses are analyzed by adopting an experimental laboratory experiment method, so that the experimental device has important significance in further researching the tunnel surrounding rock deformation damage and water seepage mechanism and the tunnel surrounding rock stability control technology.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims at providing a tunnel excavation off-load country rock infiltration test device under different stress condition to stress and the technical problem that infiltration changes when solving simulation tunnel excavation off-load, strut and lining.
The utility model discloses tunnel excavation off-load country rock infiltration test device under different stress conditions, including true triaxial pressure chamber, pressure loading unit, high-pressure water injection unit, and infiltration collecting unit;
the true triaxial pressure chamber comprises a true triaxial cavity, four confining pressure plates which are arranged in the true triaxial cavity and are arranged in a rectangular shape, a confining pressure actuator which is arranged on the true triaxial cavity and respectively applies pressure to the four confining pressure plates, two sealing discs which are positioned at two ends of the four confining pressure plates, a shaft pressure plate which applies pressure to the sealing discs, a shaft pressure actuator which is arranged on the true triaxial cavity and respectively applies pressure to the two sealing discs, and a rubber sleeve which is used for being arranged in an inner hole of an experimental test piece, wherein the sealing discs are composed of an end face sealing plate which is matched with the end face of the experimental test piece, a rectangular outer sealing ring which is matched with the outer side face of the end part of the experimental test piece, and a circular inner sealing ring which is matched with the inner hole of the end part of the experimental test piece, an annular water guide groove is arranged on the outer cylindrical face of the circular, one end of the rubber sleeve is inserted into and hermetically matched with the inner hole of the circular inner sealing ring, and the middle part of one sealing disc is provided with a liquid injection hole communicated with the inner hole of the rubber sleeve;
the pressure loading unit comprises a hydraulic station and an industrial control computer for controlling the hydraulic station, the hydraulic station is provided with three hydraulic output paths, and the three hydraulic output paths are respectively connected with the confining pressure actuator, the axial pressure actuator and the liquid injection hole on the sealing disc;
the high-pressure water injection unit comprises a water tank, a booster pump and water injection steel pipes which are arranged on the surrounding pressure plates and used for injecting water to the experimental test piece, wherein a liquid inlet of the booster pump is connected with the water tank through a water pipe, and a water outlet of the booster pump is connected with the water injection steel pipes through a water pipe; a valve and a pressure gauge for detecting water injection pressure are also arranged on a water pipe connecting the water outlet of the booster pump and the water injection steel pipe;
the seepage water collecting unit comprises a water collector and a water return pipe, and two ends of the water return pipe are respectively connected with the water collector and a drainage pore passage on the end face sealing plate.
Further, the confining pressure actuator and the axial pressure actuator are hydraulic cylinders.
The utility model has the advantages that:
the utility model discloses tunnel excavation off-load country rock infiltration test device under the different stress condition, it can adjust confining pressure and axle load exerted to the experiment test piece through the pressure loading unit to simulate the tunnel excavation of different buried depths, it can also adjust the interior pressure of applying to the experiment test piece through the pressure loading unit, simulate tunnel off-load and strut the stress variation of lining cutting. And it can also inject the water of different pressure into the experiment test piece and pass the experiment test piece, and the hydroenergy of injecing flows out through the guiding gutter to can analyze tunnel infiltration route and infiltration under the different pressure and strut the influence of lining. By adopting the utility model to carry out the tunnel excavation unloading surrounding rock water seepage test under different stress conditions, the tunnel excavation unloading stress change and the water seepage mechanism under different pressures can be mastered more accurately, and the technical problem that the tunnel water seepage research can not be carried out under the conditions of applying confining pressure, axial pressure and internal pressure simultaneously in the prior art is solved; meanwhile, the experimental device is simple to operate and easy to popularize.
Drawings
FIG. 1 is a schematic structural diagram of a tunnel excavation unloading surrounding rock water seepage test device under different stress conditions;
FIG. 2 is a schematic diagram of a top view of a true triaxial chamber;
FIG. 3 is a schematic front view of the seal disk;
FIG. 4 is a schematic sectional view of the seal disk;
fig. 5 is a schematic structural view of an experimental test piece.
Detailed Description
The invention is further described with reference to the following figures and examples.
As shown in the figure, the tunnel excavation unloading surrounding rock water seepage test device under different stress conditions of the embodiment comprises a true triaxial pressure chamber, a pressure loading unit, a high-pressure water injection unit and a water seepage collection unit.
The true triaxial pressure chamber comprises a true triaxial cavity 1, four confining pressure plates 2 which are arranged in the true triaxial cavity and are arranged in a rectangular shape, a confining pressure actuator 3 which is arranged on the true triaxial cavity and respectively applies pressure to the four confining pressure plates, two sealing discs 4 which are positioned at two ends of the four confining pressure plates, a shaft pressure plate 5 which applies pressure to the sealing discs, a shaft pressure actuator 6 which is arranged on the true triaxial cavity and respectively applies pressure to the two sealing discs, and a rubber sleeve 7 which is used for being arranged in an inner hole of an experimental test piece, wherein the sealing discs 4 comprise end face sealing plates 41 which are matched with the end faces of the experimental test piece, rectangular outer sealing rings 42 which are matched with the outer side faces of the end parts of the experimental test piece, and circular inner sealing rings 43 which are matched with the inner hole of the end parts of the experimental test piece, annular water guide grooves 44 are arranged on the outer cylindrical faces of the circular inner sealing rings, and water drainage channels, one end of the rubber sleeve is inserted into the inner hole of the circular inner sealing ring and is in sealing fit with the inner hole, and the middle part of one sealing disc is provided with a liquid injection hole 46 communicated with the inner hole of the rubber sleeve.
The pressure loading unit comprises a hydraulic station 8 and an industrial control computer 9 for controlling the hydraulic station, wherein the hydraulic station is provided with three hydraulic output paths, and the three hydraulic output paths are respectively connected with a confining pressure actuator, a shaft pressure actuator and a liquid injection hole on a sealing disc.
The high-pressure water injection unit comprises a water tank 10, a booster pump 11 and water injection steel pipes 12 which are arranged on the surrounding pressure plates and used for injecting water to the experimental test piece, wherein a liquid inlet of the booster pump is connected with the water tank through a water pipe, and a water outlet of the booster pump is connected with the water injection steel pipes through a water pipe; a valve 13 and a pressure gauge 14 for detecting the water injection pressure are also arranged on the water pipe connecting the water outlet of the booster pump and the water injection steel pipe.
The seepage water collecting unit comprises a water collector 15 and a water return pipe 16, and two ends of the water return pipe are respectively connected with the water collector and a drainage pore passage on the end face sealing plate.
In the present embodiment, the confining pressure actuator and the axial pressure actuator are hydraulic cylinders, but other forms of hydraulic linear actuators can be used in different embodiments.
When adopting the test device in this embodiment to test, earlier in the hole of the experimental test piece 17 of rubber sleeve device, inside rubber sleeve can prevent that the oil pressure from permeating the rock, then put into the confining pressure board of true triaxial pressure chamber with the experimental test piece to detain sealed dish at the both ends of experimental test piece, and make rubber sleeve's both ends insert circular inner seal ring, can experiment. In the test process, confining pressure and axial pressure applied to an experimental test piece are adjusted through a pressure loading unit according to an experimental scheme, so that loading of a rock test piece is completed, tunnel excavation with different burial depths is simulated, internal pressure applied to the experimental test piece is adjusted through the pressure loading unit, and tunnel unloading and supporting lining stress change are simulated. After the experiment loading is stable, the booster pump and the valve are opened to inject the water quantity required by the experiment into the true triaxial cavity, the injected water flows out through the water chute, and the water seepage time and the water seepage pressure are recorded in the experiment process. According to different experimental schemes, the experimental process can be operated circularly, after the experiment is completed, the high-pressure water injection unit is closed, the pressure loading unit is closed, the rock test piece is taken out, and the rock damage degree and the seepage path are observed and analyzed.
By the experimental device, tunnel excavation unloading surrounding rock water seepage tests under different stress conditions can be carried out, the influence of tunnel water seepage paths and water seepage on supporting lining under different pressures can be analyzed, the tunnel excavation unloading stress change and water seepage mechanism under different pressures can be mastered more accurately, and the technical problem that tunnel water seepage research cannot be carried out under the conditions of confining pressure, axial pressure and internal pressure simultaneously in the prior art is solved; meanwhile, the experimental device is simple to operate and easy to popularize.
Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.
Claims (2)
1. The utility model provides a tunnel excavation off-load country rock infiltration test device under different stress condition which characterized in that: the device comprises a true triaxial pressure chamber, a pressure loading unit, a high-pressure water injection unit and a seepage water collection unit;
the true triaxial pressure chamber comprises a true triaxial cavity, four confining pressure plates which are arranged in the true triaxial cavity and are arranged in a rectangular shape, a confining pressure actuator which is arranged on the true triaxial cavity and respectively applies pressure to the four confining pressure plates, two sealing discs which are positioned at two ends of the four confining pressure plates, a shaft pressure plate which applies pressure to the sealing discs, a shaft pressure actuator which is arranged on the true triaxial cavity and respectively applies pressure to the two sealing discs, and a rubber sleeve which is used for being arranged in an inner hole of an experimental test piece, wherein the sealing discs are composed of an end face sealing plate which is matched with the end face of the experimental test piece, a rectangular outer sealing ring which is matched with the outer side face of the end part of the experimental test piece, and a circular inner sealing ring which is matched with the inner hole of the end part of the experimental test piece, an annular water guide groove is arranged on the outer cylindrical face of the circular, one end of the rubber sleeve is inserted into and hermetically matched with the inner hole of the circular inner sealing ring, and the middle part of one sealing disc is provided with a liquid injection hole communicated with the inner hole of the rubber sleeve;
the pressure loading unit comprises a hydraulic station and an industrial control computer for controlling the hydraulic station, the hydraulic station is provided with three hydraulic output paths, and the three hydraulic output paths are respectively connected with the confining pressure actuator, the axial pressure actuator and the liquid injection hole on the sealing disc;
the high-pressure water injection unit comprises a water tank, a booster pump and water injection steel pipes which are arranged on the surrounding pressure plates and used for injecting water to the experimental test piece, wherein a liquid inlet of the booster pump is connected with the water tank through a water pipe, and a water outlet of the booster pump is connected with the water injection steel pipes through a water pipe; a valve and a pressure gauge for detecting water injection pressure are also arranged on a water pipe connecting the water outlet of the booster pump and the water injection steel pipe;
the seepage water collecting unit comprises a water collector and a water return pipe, and two ends of the water return pipe are respectively connected with the water collector and a drainage pore passage on the end face sealing plate.
2. The device for the seepage test of the unloading surrounding rock for tunnel excavation under the different stress conditions as claimed in claim 1, wherein: the confining pressure actuator and the axial pressure actuator are hydraulic cylinders.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021158775.9U CN212459320U (en) | 2020-06-19 | 2020-06-19 | Tunnel excavation off-load country rock infiltration test device under different stress conditions |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021158775.9U CN212459320U (en) | 2020-06-19 | 2020-06-19 | Tunnel excavation off-load country rock infiltration test device under different stress conditions |
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| CN212459320U true CN212459320U (en) | 2021-02-02 |
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| CN202021158775.9U Expired - Fee Related CN212459320U (en) | 2020-06-19 | 2020-06-19 | Tunnel excavation off-load country rock infiltration test device under different stress conditions |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113155626A (en) * | 2021-03-29 | 2021-07-23 | 中铁第四勘察设计院集团有限公司 | Tunnel full-section excavation simulation system and method |
| CN115046848A (en) * | 2022-06-30 | 2022-09-13 | 重庆大学 | Unloading simulation test device and simulation test method for surrounding rock excavation of soil-rock mixture tunnel |
| CN115235979A (en) * | 2022-09-08 | 2022-10-25 | 四川藏区高速公路有限责任公司 | Tunnel excavation off-load country rock infiltration test device |
| CN117092012A (en) * | 2023-10-18 | 2023-11-21 | 华侨大学 | Tunnel excavation surrounding rock infiltration test device |
-
2020
- 2020-06-19 CN CN202021158775.9U patent/CN212459320U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113155626A (en) * | 2021-03-29 | 2021-07-23 | 中铁第四勘察设计院集团有限公司 | Tunnel full-section excavation simulation system and method |
| CN115046848A (en) * | 2022-06-30 | 2022-09-13 | 重庆大学 | Unloading simulation test device and simulation test method for surrounding rock excavation of soil-rock mixture tunnel |
| CN115235979A (en) * | 2022-09-08 | 2022-10-25 | 四川藏区高速公路有限责任公司 | Tunnel excavation off-load country rock infiltration test device |
| CN117092012A (en) * | 2023-10-18 | 2023-11-21 | 华侨大学 | Tunnel excavation surrounding rock infiltration test device |
| CN117092012B (en) * | 2023-10-18 | 2023-12-19 | 华侨大学 | Tunnel excavation surrounding rock infiltration test device |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210202 |