CN211669011U - Fractured rock mass stress simulation device - Google Patents
Fractured rock mass stress simulation device Download PDFInfo
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- CN211669011U CN211669011U CN202020197795.0U CN202020197795U CN211669011U CN 211669011 U CN211669011 U CN 211669011U CN 202020197795 U CN202020197795 U CN 202020197795U CN 211669011 U CN211669011 U CN 211669011U
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Abstract
The utility model discloses a crack rock mass stress analogue means, its characterized in that: including reaction frame, jack and the oil feeding system who provides power for the jack, the reaction frame is vertical square reaction frame of placing, every limit inboard of square reaction frame is equipped with a jack at least, constitutes between a plurality of jacks in the square reaction frame and is used for the installation the space of fractured rock mass test device, the jack of direction about in through the reaction frame is the fractured rock mass test device simulation dead weight stress, and the jack through the direction about simulates tectonic stress, fractured rock mass test device is used for centre gripping installation fractured rock mass sample. Utilize the utility model discloses a fissured rock mass slip casting simulation visual test system can simulate under dead weight and tectonic stress combined action thick liquid flow state in the fissured rock mass, observes the change of the migration diffusion process and the different positions department thick liquid velocity of flow and pressure of thick liquid.
Description
Technical Field
The utility model belongs to the geotechnical engineering field relates to a slip casting analogue test device among the geotechnical engineering, especially a crack rock mass stress analogue means.
Background
In the process of underground rock mass excavation unloading, a large number of joints and cracks are generated in the engineering rock mass, and instability damage is easy to occur in serious conditions, so that the stability of surrounding rocks and the engineering safety are affected. Grouting is one of important means for repairing fractured rock mass and improving the strength of surrounding rock. The diffusion path and range of the slurry in the fractured rock body are important references for judging the grouting effect. At present, scholars at home and abroad make a great deal of theoretical deduction on the flowing and diffusing rule of single fracture slurry. However, both theoretical research and numerical simulation need to simplify the engineering geological conditions and the grouting mode, and certain errors exist between the research result and the field reality; and the flow and distribution conditions of the slurry in the fracture are difficult to observe visually in the field in-situ test. In contrast, the indoor simulation test can well make up the defects of the research means and can obtain relevant parameters of the grouting process. Hu Wei et al (2013) find that the rock shear strength before and after grouting does not change obviously and even a small part of rock sample shear strength is reduced through a grouting model test; similar test results were also found by swerve et al (2015), which clearly did not match the field situation. The main reason for the analysis is that the influence of the ground stress is not considered in the traditional grouting simulation test research. Therefore, the development of a fractured rock sample grouting model test under the ground stress is the key for correctly knowing the grouting reinforcement mechanism. Rock mass grouting simulation instruments developed at present are as follows:
CN 201910361886.5 discloses a simulation test device of horizontal slip casting mouth slip casting diffusion form, including receiving the irrigation body, confined pressure load control system, seepage flow water pressure loading control system, slip casting control system, data acquisition system and waste liquid collection box.
CN201811491070.6 discloses a visual crack grouting test device and method for simulating multiple main control variables, which comprises a visual crack grouting platform, grouting holes and a grouting system.
CN201811628638.4 discloses a visual detection crack grouting simulation test device and a test method, and the test device comprises a grouting pool, a test box body and a grouting pump.
CN201910022454.1 discloses a sand layer three-dimensional grouting test device capable of simulating actual working conditions and a test method thereof, which can simulate different ground stress conditions and different pore water pressures according to actual grouting requirements, and comprises a base, a pressure cover and a sample chamber.
CN201710988965.X discloses a multifunctional indoor soil body grouting simulation test device and a test method thereof, and the multifunctional indoor soil body grouting simulation test device comprises a grouting mechanism, a test chamber and a pressure control mechanism which are sequentially connected.
CN201711190560.8 discloses a pneumatic drive loose body grouting simulation test device and a test method, including a top sealing cover, a middle cylindrical grouting platform main body and a base.
CN201310351203.0 discloses a visual cross crack flowing water slip casting test device, including thick liquid collection device and cross crack platform.
Although the devices can simulate the slurry diffusion process of a rock body or a soil body to a certain extent, the device cannot simulate the grouting visual observation process of a fractured rock body under the action of self weight and tectonic stress and measure the pressure and flow rate change of each position of a fracture.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model aims to provide a fractured rock mass stress analogue means for fractured rock mass slip casting simulation visual test system can realize cracked rock mass slip casting analogue test and analysis under dead weight and tectonic stress effect. The device considers the influence of the initial ground stress condition on crack grouting diffusion and gel plugging, realizes visualization in the whole process, adopts a high-speed camera and a pressure sensor to acquire the speed and pressure of grouting at different positions in real time, and realizes automatic measurement in the test process by being connected with a computer terminal.
In order to achieve the above purpose, the utility model provides a following technical scheme:
the utility model provides a fractured rock mass stress analogue means that is used for visual test system of fractured rock mass slip casting simulation, its characterized in that: including reaction frame, jack and the oil feeding system who provides power for the jack, the reaction frame is vertical square reaction frame of placing, every limit inboard of square reaction frame is equipped with a jack at least, constitutes between a plurality of jacks in the square reaction frame and is used for the installation the space of fractured rock mass test device, the jack of direction about in through the reaction frame is the fractured rock mass test device simulation dead weight stress, and the jack through the direction about simulates tectonic stress, fractured rock mass test device is used for centre gripping installation fractured rock mass sample.
As an improvement, the square reaction frame is formed by welding an upper steel frame, a lower steel frame, a left steel frame, a right steel frame and a triangular support, two bearing plates are arranged on the inner side of each steel frame, and a jack is arranged on each bearing plate.
As an improvement, the oil supply system comprises an oil pump and a hydraulic synchronous loading splitter valve, wherein an inlet of the hydraulic synchronous loading splitter valve is connected with an outlet of the oil pump, and an outlet of the hydraulic synchronous loading splitter valve is respectively connected to each jack.
As an improvement, the fractured rock mass testing device is formed by sealing a fractured rock mass sample by four organic glass plates, namely a front organic glass plate, a rear organic glass plate, an upper organic glass plate, a lower organic glass plate and a left side plate and a right side plate, wherein the upper organic glass plate is provided with a grouting pipe extending into the fractured rock mass sample, the lower organic glass plate is provided with a grout outlet pipe connected with the interior of the fractured rock mass sample, the grouting pipe is connected with a grout supply device, and the grout outlet pipe is connected with a tail water collecting device.
As an improvement, a front organic glass plate and a rear organic glass plate of the fractured rock mass testing device are connected through bolts, and a plurality of pressure measuring holes used for placing pressure sensors are uniformly distributed in the front organic glass plate or the rear organic glass plate.
As an improvement, the stirring device is a plurality of turbine rotary propellers arranged at the bottom in the material storage tank.
As an improvement, a spoke sensor used for correcting the pressure applied by the jack is arranged between the jack and the fractured rock mass testing device.
Therefore, the utility model has the advantages of as follows:
1) utilize the utility model discloses a fissured rock mass slip casting simulation visual test system can simulate under dead weight and tectonic stress effect thick liquid flow state in the fissured rock mass to observe the migration diffusion process of thick liquid.
2) Utilize the utility model discloses a velocity of flow and the pressure variation of different positions departments in the fracture rock mass slip casting simulation visual test device measurable quantity thick liquid diffusion process overcome traditional device and can only measure exit velocity of flow and pressure.
3) Utilize the utility model discloses a visual test device of crack rock mass slip casting simulation can simulate actual complicated crack network slip casting process, researches the influence of multiple parameters such as different slip casting pressure, thick liquid characteristic, crack inclination to slip casting thick liquid diffusion and gel shutoff.
Drawings
In order to make the purpose, technical scheme and beneficial effect of the utility model clearer, the utility model provides a following figure explains:
FIG. 1 is a schematic structural diagram of a fractured rock mass grouting simulation visualization test system under the action of self weight and tectonic stress.
Fig. 2 is an enlarged three-dimensional schematic view of the stainless steel can of fig. 1.
FIG. 3 is an enlarged three-dimensional schematic view of the organic glass plates in front and at the back of the fractured rock mass testing device in FIG. 1.
FIG. 4 is an enlarged three-dimensional schematic view of the upper and lower glass plates of the fractured rock mass testing apparatus of FIG. 1.
Fig. 5 is the structural schematic diagram of the fractured rock mass stress simulator of the utility model.
Reference numerals: 1-a pressure supply device, 2-a constant pressure slurry outlet device, 3-a fractured rock mass stress simulation device, 4-a fractured rock mass test device, 5-a tail water collection device, 6-a data monitoring device, 7-an air compressor, 8-a pressure limiting valve, 9-a stainless steel tank, 10-a bracket, 11-a turbine rotary slurry, 12-a motor, 13-a pressure gauge, 14-a valve, 15-an electric oil pump, 16-a hydraulic synchronous loading flow dividing valve, 17-an oil outlet, 18-a reaction frame, 19-a grouting pipe, 20-a fractured rock mass sample, 21-a pressure bearing plate, 22-a jack, 23-a left side plate, a right side plate, 24-a pressure sensor, 25-a spoke sensor, 26-a slurry outlet pipe, 27-a triangular support and 28-an organic glass plate, 29-lower organic glass plate, 30-steel frame, 31-vertical plate, 32-transverse support plate, 33-front organic glass plate, 34-computer terminal, 35-high-speed camera, 36-pressure data acquisition display instrument, 37-polyurethane hose, 38-water receiving tank, 39-balance, 40-air inlet, 41-discharge port, 42-turbine rotary grouting hole, 43-bolt hole, 44-pressure measuring hole, 45-grouting hole, 46-grout outlet and 47-rear organic glass plate.
Detailed Description
The technical scheme of the fractured rock mass grouting simulation visualization test system under the action of biaxial stress is further specifically described by the embodiment and the attached drawings.
Example (b):
the utility model provides a consider self-weight and tectonic stress effect's fissured rock mass slip casting simulation visual test system, includes that pressure supply device 1, constant voltage go out thick liquid device 2, fissured rock mass stress analogue means 3, fissured rock mass test device 4, tail water collection device 5 and data monitoring device 6.
In the fractured rock mass grouting simulation visualization test system considering the self-weight and tectonic stress, as shown in fig. 5, the fractured rock mass stress simulation device 3 provides a pressurization simulation ground stress environment for the fractured rock mass sample 20, and comprises a reaction frame 18, a hydraulic synchronous loading flow divider valve 16, an electric oil pump 15 and a jack 22. The hydraulic synchronous loading flow divider 16 and the electric oil pump 15 constitute an oil supply system, which of course should also include an oil storage tank, which is common knowledge and not shown in fig. 1 or described in detail.
The reaction frame 18 is formed by welding an upper steel frame 30, a lower steel frame 30, a left steel frame 30, a right steel frame 30 and a triangular support 27. Each steel frame 30 is formed by welding two vertical plates 31 and a plurality of transverse supporting plates 32, and provides recoil for self-weight stress and construction stress application. The whole reaction frame 18 has a length of 1.0m and a width of 0.2 m. Two thin jacks 22 are respectively arranged at the upper, lower, left and right positions in the reaction frame 18, all the jacks 22 are connected with the oil outlet 17 of the hydraulic synchronous loading diverter valve 16, and the oil inlet of the hydraulic synchronous loading diverter valve 16 is connected with the outlet of the electric oil pump 15.
As shown in fig. 1, the upper and lower four jacks 22 simulate the self-weight stress, while the left and right four jacks 22 simulate the tectonic stress. A bearing plate 21 is arranged between the jack 22 and the reaction frame 18, and the bearing plate 21 is a steel plate with the thickness of 10mm, has certain pressure resistance and resists the recoil force of the jack 22. The front end of the jack 22 is connected with the spoke sensor 25, and is tightly attached to the upper organic glass plate 28, the lower organic glass plate 29, the left side plate 23 and the right side plate 23 of the fractured rock mass testing device 4, so that the pressure on the jack 22 is transmitted to the fractured rock mass sample 20. The spoke sensor 25 monitors the simulated self-weight stress and tectonic stress on the fractured rock mass sample 20; the left side plate 23 and the right side plate 23 are steel plates with the thickness of 5mm, and the upper organic glass plate 28 and the lower organic glass plate 29 are both 5mm in thickness, so that the pressure provided by the jack 22 can be uniformly released on the fractured rock mass sample 20.
The electric oil pump 15 is connected with the hydraulic synchronous loading splitter valve 16, so that different oil pressures can be distributed according to test requirements, and different self-weight stresses and structural stresses are provided.
In the fractured rock mass grouting simulation visualization test system considering the self-weight and tectonic stress, the fractured rock mass test device 4 consists of a fractured rock mass sample 20, an upper organic glass plate 28, a lower organic glass plate 29, a front organic glass plate 33, a rear organic glass plate 47, a left side plate 23, a right side plate 23, a grouting pipe 19 and a grout outlet pipe 26, and the fractured rock mass test device 4 is arranged in the fractured rock mass stress simulation device 3. The fractured rock mass sample 20 is manufactured through a 3D printing technology through preset fracture geometric information. The fractured rock mass sample 20 was 500mm 200mm in size. The 3D printing process leaves a mounting hole for mounting the grout pipe 19. The diameter of the grouting pipe 19 is 20mm, and the length is 400 mm. The fractured rock mass sample 20 is fixed with the front organic glass plate 33 and the rear organic glass plate 47 through bolts, and is packaged with the upper organic glass plate 28, the lower organic glass plate 29 and the left and right side plates 23 through sealing glue, so that slurry leakage is prevented.
The front organic glass plate 33 and the rear organic glass plate 47 adopt PMMA transparent organic glass, so that the migration and diffusion process of the slurry can be observed conveniently, and four bolt holes 43 are formed in the upper surface of the front organic glass plate and the rear organic glass plate. A plurality of pressure measurement holes 44 are uniformly arranged on the rear organic glass plate 47, so that the pressure sensors 24 can be conveniently placed, and the distance between the pressure measurement holes 44 is 50 mm. Holes with the diameter of 20mm are reserved in the middle of the upper organic glass plate 28 and the lower organic glass plate 29, and are respectively a grouting hole 45 for installing the grouting pipe 19 and a grout outlet 46 for installing the grout outlet 26.
In the fractured rock mass grouting simulation visualization test system considering the self weight and the tectonic stress, the pressure supply device 1 consists of the air compressor 7 and the pressure limiting valve 8, the air compressor 7 provides stable and adjustable pressure for the constant-pressure grout outlet device 2 through the pressure limiting valve 8 and the polyurethane hose 37, and the diameter of the polyurethane hose 37 is 10 mm.
In the fractured rock mass grouting simulation visualization test system considering the self weight and the tectonic stress, as shown in fig. 1 and 2, the constant-pressure grout outlet device 2 comprises a storage tank, a bracket 10, a turbine rotating grout 11 and a motor 12, and the storage tank is connected with the fractured rock mass test device 4 through a polyurethane hose 37. In this embodiment, the storage tank is a stainless steel tank 9, and the stainless steel tank 9 is square, and the size is 500 × 500 mm. The middle of the top of the stainless steel tank 9 is provided with a circular hole with the diameter of 10mm, which is used as an air inlet 40 and is connected with the outlet of the pressure supply device 1; the middle of the bottom of the stainless steel tank 9 is provided with a circular hole, the diameter of the circular hole is 10mm, the circular hole is used as a discharge hole 41 for slurry to flow out, the discharge hole 41 is connected with an inlet of the fractured rock mass testing device 4 through a pipeline, holes are drilled at two sides of the bottom of the stainless steel tank 9 at a distance of 41100 mm from the discharge hole, the diameter of the hole is 10mm, a turbine rotating slurry hole 42 for placing a turbine rotating slurry 11 is formed, the length of a rotating blade of the turbine rotating slurry 11 is 100mm, and the slurry is guaranteed to have the same workability. The motor 12 is connected to the turbine propeller 11 to provide power for the turbine propeller. The side of the stainless steel tank 9 is welded with the bracket 10, so that the stability of the stainless steel tank 9 is ensured.
In the fractured rock mass grouting simulation visualization test system considering the self weight and the tectonic stress effect, as shown in fig. 1, the tail water collecting device 5 comprises a polyurethane hose 37, a valve 14, a water receiving tank 38 and a balance 39. A water receiving tank 38 of the tail water collecting device 5 is connected with a grout outlet pipe 26 of the fractured rock mass testing device 4 through a polyurethane hose 37; the water receiving tank 38 is used for collecting the slurry discharged by the fractured rock mass testing device 4, and the balance 39 is used for weighing the mass of the slurry flowing out in unit time.
In the fractured rock mass grouting simulation visualization test system considering the self weight and the tectonic stress, the data monitoring device 6 comprises a computer terminal 34, a spoke sensor 25, a high-speed camera 35, a pressure sensor 24 and a pressure data acquisition display instrument 36. The spoke sensor 25 is connected with the computer terminal 34; the high-speed camera 35 is erected right in front of the fractured rock mass sample 20; the pressure data acquisition display 36 is connected to the pre-embedded pressure sensor 24 of the test sample.
A fractured rock mass grouting simulation visualization test method considering the self weight and the tectonic stress effect comprises the following steps,
step 1: preparing a fractured rock mass sample 20. According to the on-site rock mass engineering fracture parameter investigation data, a random distribution function of structural plane geometric parameters (such as tendency, inclination angle, trace length and the like) is obtained. On the basis, a cubic fracture network model is randomly generated by using a Monte Carlo method, the standard size of the fractured rock mass model is 500mm by 200mm, and the size of the fractured rock mass model can be changed according to test conditions. And then the fractured rock mass sample 20 is printed out through a computer and 3D printing equipment. Meanwhile, determining the self-weight stress and the tectonic stress level of the depth of the rock body in the real grouting process according to the current site stress measurement data;
step 2: assembling the fractured rock mass sample 20. Firstly, the pressure sensor 24 is placed in the pressure measuring hole 44 of the rear organic glass plate 47, then the front organic glass plate 33 and the rear organic glass plate 47 are tightly fixed on the fractured rock mass sample 20 by bolts at the position of the prefabricated bolt hole 43, and then the grouting pipe 19 is inserted. Finally, mounting the left side plate 23 and the right side plate 23 on the fractured rock mass sample 20, and sealing joints well by using a sealant to prevent slurry leakage; placing the assembled fractured rock mass sample 20 on a fractured rock mass stress simulation device 3; the grouting pipe 19 is connected to the constant-pressure grout outlet device 2, and the grout outlet pipe 26 is connected to the tail water collecting device 5;
and step 3: simulated ground stress is set. Firstly, 8 jacks 22 are arranged up, down, left and right, the rear seats of the jacks 22 are arranged on the bearing plates 21, and the jacks are screwed by bolts. The front end of the jack 22 is provided with a spoke sensor 25 and is clamped with the fractured rock mass sample 20; the jack 22 is connected to each oil outlet 17 of the hydraulic synchronous loading diverter valve 16, the inlet of the hydraulic synchronous loading diverter valve 16 is connected to the electric oil pump 15, and the electric oil pump 15 is connected to the oil storage tank; then the electric oil pump 15 is opened, the hydraulic synchronous loading flow dividing valve 16 is arranged to distribute the upper, lower, left and right oil pressure, the self-weight stress is simulated by the upper and lower jacks 22, and the structural stress is simulated by the left and right jacks 22. Finally, stress calibration is carried out by using the spoke sensors 25 on the jacks 22 so as to ensure the magnitude of the applied simulated ground stress;
and 4, step 4: and installing a monitoring device. The high-speed camera 35 is erected right in front of the fractured rock mass sample 20; the constant-pressure slurry outlet device 2 is connected to the pressure supply device 1, the pressure sensor 24 is connected to the pressure data acquisition display instrument 36, and the spoke sensor 25 is connected to the computer terminal 34;
and 5: the grouting test was started. Firstly, prepared grouting slurry is injected into a stainless steel tank 9 for standby, and a turbine propeller 11 is started. And then, starting the pressure supply device 1, adjusting the grouting pressure to a preset value, and performing grouting diffusion and plugging tests. Opening the high-speed camera 35 and recording the grouting process;
step 6: stopping grouting after the slurry flows out stably, closing the data monitoring device 6, the pressure supply device 1 and the fractured rock mass stress simulation device 3, and cleaning a grouting system and a test platform;
and 7: changing different test conditions, repeating the steps 1-6, and obtaining the influence of different parameters such as stress conditions, grouting pressure, slurry viscosity, slurry gel time and the like on the slurry diffusion rule and plugging.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications, additions and substitutions for the specific embodiments described herein may be made by those skilled in the art without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (6)
1. The utility model provides a cracked rock mass stress analogue means which characterized in that: including fissured rock mass test device, reaction frame, jack and provide the oil feeding system of power for the jack, the reaction frame is vertical square reaction frame of placing, every limit inboard of square reaction frame is equipped with a jack at least, constitutes between a plurality of jacks in the square reaction frame and is used for the installation fissured rock mass test device's space, and the jack through upper and lower direction in the reaction frame is fissured rock mass test device simulation dead weight stress, and the jack through left and right directions simulates tectonic stress, fissured rock mass test device is used for centre gripping installation fissured rock mass sample.
2. The fractured rock mass stress simulation device of claim 1, wherein: the square reaction frame is formed by welding an upper steel frame, a lower steel frame, a left steel frame, a right steel frame and a triangular support, two bearing plates are arranged on the inner side of each steel frame, and a jack is arranged on each bearing plate.
3. The fractured rock mass stress simulation device of claim 2, wherein: the oil supply system comprises an oil pump and a hydraulic synchronous loading diverter valve, wherein an inlet of the hydraulic synchronous loading diverter valve is connected with an outlet of the oil pump, and an outlet of the hydraulic synchronous loading diverter valve is respectively connected to each jack.
4. The fractured rock mass stress simulation device of claim 2, wherein: the fractured rock mass test device is formed by sealing a fractured rock mass sample by four organic glass plates, namely a front organic glass plate, a rear organic glass plate, an upper organic glass plate, a lower organic glass plate, a left side plate and a right side plate, wherein the upper organic glass plate is provided with a grouting pipe extending into the fractured rock mass sample, the lower organic glass plate is provided with a grout outlet pipe connected with the interior of the fractured rock mass sample, the grouting pipe is connected with a grout supply device, and the grout outlet pipe is connected with a tail water collecting device.
5. The fractured rock mass stress simulation device of claim 4, wherein: the front organic glass plate and the rear organic glass plate of the fractured rock mass testing device are connected through bolts, and a plurality of pressure measuring holes used for placing pressure sensors are uniformly distributed in the front organic glass plate or the rear organic glass plate.
6. The fractured rock mass stress simulation device of claim 5, wherein: and a spoke sensor used for correcting the pressure applied by the jack is arranged between the jack and the fractured rock mass testing device.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112268836A (en) * | 2020-11-05 | 2021-01-26 | 山东科技大学 | Device for determining viscosity of slurry used for test and test method |
| CN113702246A (en) * | 2021-08-25 | 2021-11-26 | 河海大学 | Monitoring device and monitoring method for pollutant migration in filling fracture network |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112268836A (en) * | 2020-11-05 | 2021-01-26 | 山东科技大学 | Device for determining viscosity of slurry used for test and test method |
| CN113702246A (en) * | 2021-08-25 | 2021-11-26 | 河海大学 | Monitoring device and monitoring method for pollutant migration in filling fracture network |
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