CN213456463U - True triaxial rock mass hydraulic fracture and fracture grouting simulation test device - Google Patents
True triaxial rock mass hydraulic fracture and fracture grouting simulation test device Download PDFInfo
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- CN213456463U CN213456463U CN202022585739.7U CN202022585739U CN213456463U CN 213456463 U CN213456463 U CN 213456463U CN 202022585739 U CN202022585739 U CN 202022585739U CN 213456463 U CN213456463 U CN 213456463U
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Abstract
The utility model discloses a real triaxial rock mass water conservancy splitting and splitting slip casting analogue test device, including rigidity reaction frame and cuboid sample, the sealed setting of cuboid sample is in rigidity reaction frame, be provided with a plurality of hydro-cylinder pistons between cuboid sample and the rigidity reaction frame, be provided with the biography power board between cuboid sample and the hydro-cylinder piston, be provided with the fracturing hole or prefabricated crack on the cuboid sample, fracturing hole or prefabricated crack pass power jar through water oil separating and are connected with high-pressure water pressure source or splitting slip casting system, the hydro-cylinder piston is connected with hydraulic system and crack hydraulic system respectively, the biography power board, the hydro-cylinder piston, water oil separating passes power jar and high-pressure water pressure source or splitting slip casting system all is connected with monitoring system. The utility model discloses simple structure, convenient to use, true triaxial rock mass water conservancy splitting of simulation and splitting slip casting analogue test that can be better, the research of the corresponding mechanism of being convenient for provides the theoretical foundation for practical application.
Description
Technical Field
The utility model belongs to the technical field of geotechnical engineering, concretely relates to true triaxial rock mass water conservancy splitting and splitting slip casting analogue test device.
Background
In deep underground engineering and high reservoir dam hydroelectric engineering, rock mass is often under the action of high ground stress and high osmotic pressure. Under the combined action of high osmotic pressure and excavation unloading, the rock mass can be subjected to hydraulic fracture damage. On the other hand, when the underground cavern is excavated under the condition of high ground stress, the hydraulic fracture method is often adopted in the engineering to release pressure to prevent high ground stress impact accidents. In some cases, the rock body needs to be pre-reinforced by high-pressure split grouting to improve the integrity and stability of the surrounding rock.
At present, in the hydraulic fracturing and fracturing grouting of the rock mass, the rock mass fracture initiation mechanism, the diffusion rule and the fracturing grouting mechanism need to be researched and analyzed through a model test. How to simulate rock mass rather than rock mass and rock mass ground stress condition is very key to mechanism research. Therefore, a true triaxial rock mass hydraulic fracture and fracture grouting simulation test device is urgently needed.
SUMMERY OF THE UTILITY MODEL
To the above, the utility model provides a true triaxial rock mass water conservancy splitting and splitting slip casting analogue test device, simple structure, convenient to use, the true triaxial rock mass water conservancy splitting of simulation and splitting slip casting analogue test that can be better, the research of the corresponding mechanism of being convenient for provides the theoretical foundation for practical application.
In order to achieve the above object, the present invention provides a technical solution for solving the technical problem: the utility model provides a true triaxial rock mass hydraulic fracture and fracture grouting simulation test device, including rigid reaction frame and cuboid sample, the cuboid sample is sealed to be set up in rigid reaction frame, be provided with a plurality of hydro-cylinder pistons between cuboid sample and the rigid reaction frame, be provided with the biography power board between cuboid sample and the hydro-cylinder piston, be provided with fracturing hole or prefabricated crack on the cuboid sample, fracturing hole or prefabricated crack pass through water oil separating power transmission cylinder and high-pressure water pressure source or fracture slip casting system connection, the hydro-cylinder piston is connected with hydraulic system and fracture hydraulic system respectively, hydraulic system includes hydraulic pressure source and electro-hydraulic servo control system, fracture hydraulic system includes the oil-water separation power transmission cylinder that connects gradually, electro-hydraulic servo valve and fracture water pressure source, biography power board, the oil cylinder piston, the oil-water separation force transmission cylinder and the high-pressure water pressure source or the splitting grouting system are all connected with the monitoring system.
The utility model has the advantages that: the method comprises the steps that a cuboid sample is hermetically arranged in a rigid reaction frame, the rigid reaction frame can provide reaction force, is connected with a hydraulic system, a fracture hydraulic system and a high-pressure hydraulic source or a split grouting system, is used for simulating the stress condition of a rock mass in the actual condition, actively loads 5 surfaces of the cuboid sample, passively loads 1 surface of the cuboid sample, and is controlled by an electro-hydraulic servo control system, and a force transmission plate is arranged to uniformly transmit simulated ground stress to the surface of the cuboid sample, so that the actual use condition is better met; the monitoring system can monitor the magnitude of the simulated crustal stress and the change of each parameter at each position during the simulation test, and can perform summation processing. The side length of a cuboid sample is 0.5m at most, the cuboid sample can be cut and processed by using on-site rocks, and can also be poured by adopting similar materials such as mortar or concrete, and the geometric similarity coefficient and the volume weight similarity coefficient are generally 1. In a simulation test, a cuboid sample is adopted for facilitating the loading of three-dimensional ground stress, the water sealing capacity of the sample without the prefabricated crack can reach 40MPa, and the water sealing capacity of the sample with the prefabricated crack can reach 10 MPa. The simulation test device can simulate hydraulic fracture and fracturing grouting of a rock at a deep part of 1000m, also can simulate the ground stress of a stratum at a depth of about 1000m, 3 main stresses can be independently loaded and controlled, the ground stress simulation of 30-40MPa is realized, and the resolution is not lower than 0.5 MPa; meanwhile, the high-pressure water pressure or grouting pressure is at least 50MPa, and the resolution is not lower than 0.1 MPa. The utility model discloses a simulation test device simple structure, convenient to use, true triaxial rock mass water conservancy splitting and splitting slip casting analogue test of simulation that can be better, the research of the corresponding mechanism of being convenient for provides theoretical foundation for practical application.
Further, the monitoring system comprises an acoustic emission sensor, a strain gauge, a pressure sensor, an acceleration detector and a computer.
The beneficial effect of adopting the further scheme is that: the acoustic emission sensor, the strain gauge, the pressure sensor and the like can accurately feed back real-time parameters and changes of all parts in the simulation test, monitor parameter change conditions in the simulation test process together, measure cracking, end strain (judging cracking pressure) and hydrofracturing critical pressure of the prefabricated crack, and then transmit the measured cracking, end strain and hydrofracturing critical pressure to the computer for processing, so that data analysis and processing are facilitated, and mechanism analysis is performed.
Further, the acoustic emission sensor and the pressure sensor are arranged on the force transmission plate, and the strain patterns are arranged at the fracturing holes or the prefabricated cracks.
The beneficial effect of adopting the further scheme is that: the acoustic emission sensor and the acceleration detector can monitor microseismic signals generated by crack expansion of the crack, the pressure sensor is matched with the oil-water isolator to monitor grouting pressure at different positions, and can also monitor fracturing water pressure, crack water pressure, grouting pressure, osmotic pressure and soil pressure, strain flowers are used for monitoring crack tip deformation and sample deformation, and colored tracer is adopted to track crack expansion and transmit the crack expansion to the computer.
Furthermore, the splitting grouting system comprises a metering pump, the metering pump is connected with a slurry storage tank through a high-pressure rubber pipe, the slurry storage tank is connected with a cuboid sample through a pipeline, and a hydraulic piston and a grouting pressure sensor are respectively arranged on the slurry storage tank and the pipeline.
The beneficial effect of adopting the further scheme is that: when the fracturing grouting test is carried out, the fracturing hydraulic system is replaced by the fracturing grouting system, fracturing grouting is carried out through the cooperation of a metering pump, a high-pressure rubber pipe and the like, real environmental conditions are simulated, and a simulation test is carried out.
Further, cuboid sample center department is provided with the through-hole, is provided with steel pipe one and steel pipe two in the through-hole, and the through-hole depth 230 supplyes 360mm department and be the naked eye.
Furthermore, the outlet ends of the first steel pipe and the second steel pipe are provided with high-pressure quick connectors, the first steel pipe is connected with a high-pressure water source, and the second steel pipe is connected with an exhaust valve, a stop valve and a pressure sensor.
The beneficial effect of adopting the further scheme is that: the first steel pipe is used as a water pressing hole or a grouting hole and can be connected with a high-pressure water source for simulating actual environmental conditions; and the second steel pipe is used as an exhaust, water pressure and grouting pressure monitoring hole and is used for monitoring parameter change in the test process.
Furthermore, the first steel pipe and the second steel pipe are bonded and sealed with the wall of the through hole through epoxy resin.
The beneficial effect of adopting the further scheme is that: and high-strength materials such as epoxy resin are adopted for bonding and sealing, so that the sealing performance between the steel pipe and the wall of the drilled hole is good, and the steel pipe is not easy to leak.
Drawings
FIG. 1 is a schematic view of the present invention;
FIG. 2 is a schematic view of a split grouting system;
FIG. 3 is a schematic view of a rectangular parallelepiped sample;
the method comprises the following steps that 1, an electro-hydraulic servo control system is adopted; 2. a hydraulic source; 3. a rigid reaction frame; 4. a cuboid sample; 5. a force transmission plate; 6. a cylinder piston; 7. an oil-water separation force transmission cylinder; 8. a high pressure water pressure source or a split grouting system; 9. a computer; 10. a monitoring system; 11. fracturing holes or preparing cracks; 12. an electro-hydraulic servo valve; 13. a fracture water pressure source; 14. a metering pump; 15. a high-pressure rubber hose; 16. a slurry storage tank; 17. a hydraulic piston; 18. a grouting pressure sensor; 19. a first steel pipe; 20. and a second steel pipe.
Detailed Description
The following detailed description of the embodiments of the present invention will be made with reference to the accompanying drawings.
In one embodiment of the present invention, as shown in fig. 1-3, a true triaxial rock mass hydraulic fracture and fracture grouting simulation test device is provided, which comprises a rigid reaction frame 3 and a cuboid sample 4, the cuboid sample 4 is hermetically arranged in the rigid reaction frame 3, a plurality of oil cylinder pistons 6 are arranged between the cuboid sample 4 and the rigid reaction frame 3, a force transmission plate 5 is arranged between the cuboid sample 4 and the oil cylinder pistons 6, a fracturing hole or a prefabricated fracture 11 is arranged on the cuboid sample 4, the fracturing hole or the prefabricated fracture 11 is connected with a high pressure water source or a fracture grouting system 8 through an oil-water separation force transmission cylinder 7, the oil cylinder pistons 6 are respectively connected with a hydraulic system and a fracture hydraulic system, the hydraulic system comprises a hydraulic source 2 and an electro-hydraulic servo control system 1, the fracture hydraulic system comprises an oil-water separation force transmission cylinder 7, an electro-hydraulic servo valve 12 and a fracture water pressure source 13 which are connected in sequence, the force transmission plate 5, the oil cylinder piston 6, the oil-water separation force transmission cylinder 7 and the high-pressure water pressure source or the splitting grouting system 8 are all connected with a monitoring system 10. The method is characterized in that a cuboid sample 4 is hermetically arranged in a rigid reaction frame 3, the rigid reaction frame 3 can provide counter force, and is simultaneously connected with a hydraulic system, a fracture hydraulic system, a high-pressure hydraulic source or a splitting grouting system 8 for simulating the stress condition of a rock mass in the actual condition, 5 surfaces of the cuboid sample 4 are actively loaded, 1 surface is passively loaded and is controlled by an electro-hydraulic servo control system 1, and a force transfer plate 5 is arranged for uniformly transferring simulated ground stress to the surface of the cuboid sample 4, so that the actual use condition is better met; the monitoring system 10 can monitor the magnitude of the simulated ground stress and the change of each parameter at each place in the simulation test, and can perform the summation processing. The side length of the cuboid sample 4 is 0.5m at most, the cuboid sample can be cut and processed by site rocks, and can also be poured by similar materials such as mortar or concrete, and the geometric similarity coefficient and the volume weight similarity coefficient are generally 1. In a simulation test, the cuboid sample 4 is adopted for facilitating the loading of three-dimensional ground stress, the water sealing capacity of the sample without the prefabricated crack can reach 40MPa, and the water sealing capacity of the sample with the prefabricated crack can reach 10 MPa. The simulation test device can simulate hydraulic fracture and fracturing grouting of a rock at a deep part of 1000m, also can simulate the ground stress of a stratum at a depth of about 1000m, 3 main stresses can be independently loaded and controlled, the ground stress simulation of 30-40MPa is realized, and the resolution is not lower than 0.5 MPa; meanwhile, the high-pressure water pressure or grouting pressure is at least 50MPa, and the resolution is not lower than 0.1 MPa. The utility model discloses a simulation test device simple structure, convenient to use, true triaxial rock mass water conservancy splitting and splitting slip casting analogue test of simulation that can be better, the research of the corresponding mechanism of being convenient for provides theoretical foundation for practical application.
The monitoring system 10 comprises an SS430 type acoustic emission sensor, a strain rosette, an AST2000H2 type pressure sensor, an acceleration detector and a computer 9; the acoustic emission sensor, the strain gauge, the pressure sensor and the like can accurately feed back real-time parameters and changes of all parts in the simulation test, monitor parameter change conditions in the simulation test process together, measure cracking, end strain (judging cracking pressure) and hydrofracturing critical pressure of the prefabricated crack, and then transmit the measured cracking, end strain and hydrofracturing critical pressure to the computer 9 for processing, so that data analysis and processing are facilitated, and mechanism analysis is performed. The acoustic emission sensor and the pressure sensor are arranged on the force transmission plate 5, and the strain patterns are arranged at the fracturing holes or the prefabricated cracks 11; the acoustic emission sensor and the acceleration detector can monitor microseismic signals generated by crack expansion of the crack, the pressure sensor is matched with the oil-water isolator to monitor grouting pressure at different positions, and can also monitor fracturing water pressure, crack water pressure, grouting pressure, osmotic pressure and soil pressure, strain flowers are used for monitoring crack tip deformation and sample deformation, and colored tracer is adopted to track crack expansion and transmit the crack expansion to the computer 9. The splitting grouting system comprises a metering pump 14, the metering pump 14 is connected with a slurry storage tank 16 through a high-pressure rubber pipe 15, the slurry storage tank 16 is connected with a cuboid sample 4 through a pipeline, and a hydraulic piston 17 and a grouting pressure sensor 18 are respectively arranged on the slurry storage tank 16 and the pipeline; when the fracturing grouting test is carried out, the fracturing hydraulic system is replaced by the fracturing grouting system, the fracturing grouting is carried out through the matching of the metering pump 14, the high-pressure rubber pipe 15 and the like, the real environmental condition is simulated, and the simulation test is carried out. A through hole is formed in the center of the cuboid sample 4, a first steel pipe 19 and a second steel pipe 20 are arranged in the through hole, and a bare hole is formed in the position with the through hole depth of 230 plus 360 mm; the outlet ends of the first steel pipe 19 and the second steel pipe 20 are respectively provided with a high-pressure quick connector, the first steel pipe 19 is connected with a high-pressure water source, and the second steel pipe 20 is connected with an exhaust valve, a stop valve and a pressure sensor; the first steel pipe 19 is used as a water pressing hole or a grouting hole and can be connected with a high-pressure water source for simulating actual environmental conditions; the second steel pipe 20 is used as an exhaust, water pressure and grouting pressure monitoring hole and is used for monitoring parameter changes in the test process. The first steel pipe 19 and the second steel pipe 20 are bonded and sealed with the wall of the through hole through epoxy resin; and high-strength materials such as epoxy resin are adopted for bonding and sealing, so that the sealing performance between the steel pipe and the wall of the drilled hole is good, and the steel pipe is not easy to leak.
While the present invention has been described in detail and with reference to the accompanying drawings, it is not to be considered as limited to the scope of the invention. Various modifications and changes may be made by those skilled in the art without inventive step within the scope of the appended claims.
Claims (7)
1. The utility model provides a real triaxial rock mass water conservancy splitting and splitting slip casting analogue test device, its characterized in that, includes rigidity reaction frame (3) and cuboid sample (4), cuboid sample (4) seal to set up in rigidity reaction frame (3), cuboid sample (4) with be provided with a plurality of hydro-cylinder pistons (6) between rigidity reaction frame (3), cuboid sample (4) with be provided with biography power board (5) between hydro-cylinder piston (6), be provided with on cuboid sample (4) and have a fracturing hole or prefabricated crack (11), fracturing hole or prefabricated crack (11) pass through water oil separating and pass power cylinder (7) and are connected with high-pressure water pressure source or splitting slip casting system (8), hydro-cylinder piston (6) are connected with hydraulic system and crack hydraulic system respectively, hydraulic system includes hydraulic pressure source (2) and electrohydraulic servo control system (1), the fracture hydraulic system comprises an oil-water separation force transmission cylinder (7), an electro-hydraulic servo valve (12) and a fracture water pressure source (13) which are connected in sequence, wherein the force transmission plate (5), the oil cylinder piston (6), the oil-water separation force transmission cylinder (7) and the high-pressure water pressure source or the fracture grouting system (8) are connected with a monitoring system (10).
2. The hydraulic fracturing and fracturing grouting simulation test device for the true triaxial rock body according to claim 1, wherein the monitoring system (10) comprises an acoustic emission sensor, a strain gauge, a pressure sensor, an acceleration detector and a computer (9).
3. The device for the hydraulic fracturing and grouting simulation test of the true triaxial rock body according to claim 2, wherein the acoustic emission sensor and the pressure sensor are arranged on the force transmission plate (5), and the strain rosette is arranged at the fracturing hole or the prefabricated fracture (11).
4. The device for the hydraulic fracturing and fracturing grouting simulation test of the true triaxial rock body according to claim 1, wherein the fracturing and grouting system comprises a metering pump (14), the metering pump (14) is connected with a grout storage tank (16) through a high-pressure rubber pipe (15), the grout storage tank (16) is connected with a cuboid sample (4) through a pipeline, and the grout storage tank (16) and the pipeline are respectively provided with a hydraulic piston (17) and a grouting pressure sensor (18).
5. The device for the hydraulic fracturing and grouting fracturing of the true triaxial rock mass according to claim 1, wherein a through hole is formed in the center of the cuboid sample (4), a first steel pipe (19) and a second steel pipe (20) are arranged in the through hole, and a bare hole is formed in the position with the depth of 230-fold and 360 mm.
6. The device for the hydraulic fracturing and grouting fracturing of the true triaxial rock body according to claim 5, wherein the outlet ends of the first steel pipe (19) and the second steel pipe (20) are respectively provided with a high-pressure quick connector, the first steel pipe (19) is connected with a high-pressure water source, and the second steel pipe (20) is connected with an exhaust valve, a stop valve and a pressure sensor.
7. The device for simulating the hydraulic fracture and fracture grouting of the true triaxial rock body according to claim 5, wherein the first steel pipe (19) and the second steel pipe (20) are bonded and sealed with the wall of the through hole through epoxy resin.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113552323A (en) * | 2021-08-03 | 2021-10-26 | 山西银锋科技有限公司 | High-pressure rock grouting test experiment system and test method thereof |
| CN115015251A (en) * | 2022-06-01 | 2022-09-06 | 青岛理工大学 | Visual three-dimensional fracture grouting experiment system and method under multiple acting forces |
| CN116735367A (en) * | 2023-06-21 | 2023-09-12 | 安徽理工大学 | True triaxial rock-soil body test device and test method thereof |
-
2020
- 2020-11-10 CN CN202022585739.7U patent/CN213456463U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113552323A (en) * | 2021-08-03 | 2021-10-26 | 山西银锋科技有限公司 | High-pressure rock grouting test experiment system and test method thereof |
| CN115015251A (en) * | 2022-06-01 | 2022-09-06 | 青岛理工大学 | Visual three-dimensional fracture grouting experiment system and method under multiple acting forces |
| CN115015251B (en) * | 2022-06-01 | 2024-03-12 | 青岛理工大学 | Visual three-dimensional crack grouting experiment system and method under multiple acting forces |
| CN116735367A (en) * | 2023-06-21 | 2023-09-12 | 安徽理工大学 | True triaxial rock-soil body test device and test method thereof |
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