CN111983197B - Fracture rock mass grouting simulation visualization test system and test method considering stress effect - Google Patents
Fracture rock mass grouting simulation visualization test system and test method considering stress effect Download PDFInfo
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- CN111983197B CN111983197B CN202010939365.6A CN202010939365A CN111983197B CN 111983197 B CN111983197 B CN 111983197B CN 202010939365 A CN202010939365 A CN 202010939365A CN 111983197 B CN111983197 B CN 111983197B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
Abstract
The invention discloses a fracture rock mass grouting simulation visualization test system and a test method considering stress effect. The invention can simulate the flowing state of the slurry in the fractured rock mass under the combined action of the self weight and the structural stress, observe the migration and diffusion process of the slurry and the change of the slurry flow rate and the slurry pressure at different positions, overcome the defect that the initial ground stress effect and the slurry movement process visualization cannot be considered in the prior art, and simulate the slurry flowing process of the complex rock mass under the influence of various parameters such as different grouting pressures, slurry characteristic fracture dip angles and the like.
Description
Technical Field
The invention belongs to the field of geotechnical engineering, relates to a grouting simulation test device in geotechnical engineering, and particularly relates to a crack rock mass grouting simulation visual test system and method considering stress effect.
Background
In the process of excavating and unloading the underground rock mass, a large number of joints and cracks are generated in the engineering rock mass, and instability and damage easily occur when the underground rock mass is serious, so that the stability of surrounding rock and the engineering safety are affected. Grouting is one of the important means for repairing fractured rock mass and improving surrounding rock strength. The diffusion path and extent of the slurry in the fractured rock mass are important references for determining the grouting effect. At present, scholars at home and abroad make a great deal of theoretical deductions on the flow and diffusion rule of single-crack slurry. However, both theoretical research and numerical simulation need to simplify engineering geological conditions and grouting modes, and a research result and the site actual have certain errors; in-situ tests are difficult to visually observe the flow and distribution of slurry in cracks. In contrast, the indoor simulation test can better make up the defects of the research means and can obtain the related parameters of the grouting process. Hu Wei et al (2013) found that the shear strength of rock mass before and after grouting did not change significantly and even a small part of the shear strength of rock sample was reduced by grouting model test; similar test results were also found by Zhang Weijie et al (2015), which clearly is not compatible with 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, developing a fractured rock sample grouting model test under ground stress is a key for correctly understanding a grouting reinforcement mechanism. The rock mass grouting simulation instruments developed at present are as follows:
CN 201910361886.5 discloses a simulation test device for grouting diffusion form of horizontal grouting port, which comprises a grouting receiving body, a confining pressure load control system, a seepage water pressure loading control system, a grouting control system, a data acquisition system and a waste liquid recovery box.
CN201811491070.6 discloses a visual crack grouting test device and method for simulating multiple main control variables, comprising a visual crack grouting platform, grouting holes and a grouting system.
CN201811628638.4 discloses a visual crack detection grouting simulation test device and a test method, wherein the 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 grouting simulation test device and a test method thereof, wherein the multifunctional indoor soil 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 driving loose body grouting simulation test device and a test method, wherein the device comprises a top sealing cover, a middle cylindrical grouting platform main body and a base.
CN201310351203.0 discloses a visual cross-fracture dynamic water grouting test device, which comprises a slurry collecting device and a cross-fracture platform.
Although these devices can simulate the diffusion process of rock mass or soil slurry to some extent, they cannot simulate the visual observation process of fractured rock mass grouting under the action of dead weight and structural stress, and measure the pressure and flow velocity changes at various positions of the fracture.
Disclosure of Invention
In view of the above, the invention aims to provide a fracture rock mass grouting simulation visual test system and a test method considering stress effect, which can realize fracture rock mass grouting simulation test and analysis under the effects of dead weight and structural stress. The device considers the influence of initial ground stress conditions on crack grouting diffusion and gel blocking, realizes visualization in the whole process, adopts a high-speed camera and a pressure sensor to collect the speed and the pressure of different grouting 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 present invention provides the following technical solutions:
a fracture rock mass grouting simulation visual test system considering stress effect is characterized in that: the device comprises a slurry supply device, a fractured rock mass stress simulation device, a fractured rock mass test device, a tail water collection device and a data monitoring device, wherein the fractured rock mass stress simulation device comprises a counter-force frame, jacks and an oil supply system for providing power for the jacks, the counter-force frame is a square counter-force frame which is vertically arranged, at least one jack is arranged on the inner side of each side of the square counter-force frame, the fractured rock mass test device is arranged among a plurality of jacks in the square counter-force frame, the jacks in the vertical direction in the counter-force frame simulate the dead weight stress for the fractured rock mass test device, the jacks in the horizontal direction simulate the construction stress for the fractured rock mass test device, the fractured rock mass test device is used for clamping and installing fractured rock mass samples, the slurry supply device is used for providing constant-pressure slurry for the fractured rock mass samples, the tail water collection device is used for collecting the slurry flowing out of the fractured rock mass samples, and the data monitoring device is used for monitoring and collecting parameter data in the fractured rock mass grouting simulation test; 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.
Further, the oil supply system comprises an oil pump and a hydraulic synchronous loading flow dividing valve, wherein an inlet of the hydraulic synchronous loading flow dividing valve is connected with an outlet of the oil pump, and an outlet of the hydraulic synchronous loading flow dividing valve is respectively connected to each jack.
Further, the fractured rock mass testing device is formed by sealing fractured rock mass samples in a front-back mode, 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 samples, the lower organic glass plate is provided with a grouting pipe connected with the fractured rock mass samples, the grouting pipe is connected with a slurry supply device, and the grouting pipe is connected with a tail water collecting device.
Further, the front organic glass plate and the rear organic glass plate of the fractured rock mass testing device are connected through bolts, the front organic glass plate or the rear organic glass plate is uniformly distributed with a plurality of pressure measuring holes for placing pressure sensors, and data acquired by the pressure sensors are acquired and displayed through a pressure data acquisition display instrument.
Further, the thick liquids supply device includes the storage tank, supplies pressure equipment device and locates the agitating unit in the storage tank, the storage tank top is equipped with the air inlet that links to each other with supplying pressure equipment device, supply pressure equipment device to provide invariable atmospheric pressure for the storage tank through the air inlet, the storage tank bottom is equipped with the discharge gate that is linked together with the slip casting pipe.
Further, the stirring device is a plurality of turbine rotary pulps arranged at the inner bottom of the storage tank.
Further, the data monitoring device comprises a high-speed camera, a computer terminal and a spoke sensor, wherein data collected by the high-speed camera and the spoke sensor are transmitted to the computer terminal for processing through a data line, the high-speed camera is used for photographing a fractured rock mass sample in the fractured rock mass test device, and the spoke sensor is arranged between the jack and the fractured rock mass test device and used for correcting pressure applied by the jack.
The fractured rock mass grouting simulation visual test method using the fractured rock mass grouting simulation visual test system is characterized by comprising the following steps of:
step 1, preparing a fractured rock mass sample, namely obtaining a structural plane geometric parameter random distribution function according to on-site rock mass engineering fracture parameter survey data, randomly generating a cube fracture network model by using a Monte Carlo method on the basis, printing out the fractured rock mass sample by using 3D printing equipment, and determining the dead weight stress and the structural stress level of the depth of the rock mass in the simulated real grouting process according to on-site ground stress measurement data;
step 2, assembling a fractured rock mass sample, namely firstly placing a pressure sensor in a pressure hole of a rear organic glass plate, then tightly fixing a front organic glass plate and a rear organic glass plate on the fractured rock mass sample at a precast bolt hole position by using bolts, then inserting a grouting pipe, finally installing an upper organic glass plate, a lower organic glass plate, a left side plate and a right side plate on the fractured rock mass sample, sealing joints by using sealant, preventing slurry leakage, and finishing assembling of the fractured rock mass test device; placing the fractured rock mass testing device of the assembled fractured rock mass sample on a fractured rock mass stress simulation device; the grouting pipe is connected to the slurry supply device, and the slurry outlet pipe is connected to the tail water collecting device;
step 3, setting simulated ground stress, namely firstly installing a plurality of jacks up, down, left and right, placing the rear seats of the jacks on a bearing plate, placing spoke sensors at the front ends of the jacks, and clamping with a fractured rock mass test device of an assembled fractured rock mass sample; the jacks are connected with the hydraulic synchronous loading flow dividing valve through oil pipes, then the oil pump is started, the hydraulic synchronous loading flow dividing valve is arranged to distribute the oil pressure up, down, left and right, the self-weight stress is simulated through the upper jack and the lower jack, the structural stress is simulated through the left jack and the right jack, and finally the stress calibration is performed through spoke sensors on each jack so as to ensure the magnitude of the simulated ground stress applied;
step 5, starting a grouting test, namely injecting the prepared grouting slurry into a storage tank for standby, starting a turbine to spin slurry to ensure the workability of the slurry, starting a pressure supply device, adjusting the grouting pressure to a preset value, performing grouting diffusion and plugging tests, starting a high-speed camera, and recording the grouting process;
step 6: stopping grouting after the slurry flows out stably, closing the data monitoring device, the pressure supply device and the fractured rock mass stress simulation device, and cleaning the fractured rock mass grouting simulation visual test system;
step 7: the different test conditions are changed, and the above steps 1-6 are repeated, so that the influence of parameters such as different ground stress conditions, grouting pressure, slurry viscosity, slurry gel time and the like on the slurry diffusion rule and the plugging can be obtained.
The utility model provides a crack rock mass stress simulation device which characterized in that: the device comprises a reaction frame, jacks and an oil supply system for providing power for the jacks, wherein the reaction frame is a vertically placed square reaction frame, at least one jack is arranged on the inner side of each side of the square reaction frame, a space for installing a fractured rock mass test device is formed between a plurality of jacks in the square reaction frame, the jacks in the vertical direction in the reaction frame simulate self-weight stress for the fractured rock mass test device, the jacks in the horizontal direction simulate construction stress for the fractured rock mass test device, and the fractured rock mass test device is used for clamping and installing fractured rock mass samples.
Therefore, the invention has the following advantages:
1) The invention can simulate the flowing state of the slurry in the fractured rock mass under the action of the dead weight and the structural stress, and observe the migration and diffusion process of the slurry.
2) The test device can measure the flow velocity and pressure change at different positions in the slurry diffusion process, and overcomes the defect that the traditional device can only measure the flow velocity and pressure of an inlet and an outlet.
3) The test device can simulate the actual complex fracture network grouting process, and research the influence of various parameters such as different grouting pressures, slurry characteristics, fracture dip angles and the like on grouting slurry diffusion and gel plugging.
Drawings
In order to make the objects, technical solutions and advantageous effects of the present invention more clear, the present invention provides the following drawings for description:
FIG. 1 is a schematic diagram of a simulated visual test system for grouting fractured rock mass under the action of self weight and structural stress.
Fig. 2 is an enlarged three-dimensional schematic view of the stainless steel tank of fig. 1.
FIG. 3 is an enlarged three-dimensional schematic view of the organic glass panels of the fractured rock mass apparatus of FIG. 1.
FIG. 4 is an enlarged three-dimensional schematic view of upper and lower glass plates of the fractured rock mass apparatus of FIG. 1.
Reference numerals: the device comprises a 1-pressure supply device, a 2-constant pressure slurry outlet device, a 3-fractured rock mass stress simulation device, a 4-fractured rock mass test device, a 5-tail water collection device, a 6-data monitoring device, a 7-air compressor, an 8-pressure limiting valve, a 9-stainless steel tank, a 10-support, 11-turbine slurry rotating, a 12-motor, a 13-pressure gauge, a 14-valve, a 15-electric oil pump, a 16-hydraulic synchronous loading flow dividing valve, a 17-oil outlet, a 18-reaction frame, a 19-grouting pipe, a 20-fractured rock mass sample, a 21-bearing plate, a 22-jack, 23-left and right side plates, a 24-pressure sensor, a 25-spoke sensor, a 26-slurry outlet pipe, a 27-triangular support, a 28-upper organic glass plate, a 29-lower organic glass plate, a 30-steel frame, a 31-vertical plate, a 32-transverse support plate, a 33-front organic glass plate, a 34-computer terminal, a 35-high-speed camera, a 36-pressure data acquisition display instrument, a 37-polyurethane hose, a 38-water receiving tank, a 39-balance, a 40-discharge port, a 40-left-right side plate, a 24-left side plate, a 24-left-side plate, a 24-lower plate, a 29-side plate, a 29-upper plate, a 29-lower plate, a 43-and a 43-lower plate, a slurry inlet, a 43-and a 46-stage, a slurry pump, a 43-and a 46.
Detailed Description
The technical scheme of the fracture rock mass grouting simulation visual test system under the action of biaxial stress is further specifically described through the following examples and with reference to the accompanying drawings.
Examples:
a fracture rock mass grouting simulation visual test system considering stress effect comprises a pressure supply device 1, a constant pressure slurry outlet device 2, a fracture rock mass stress simulation device 3, a fracture rock mass test device 4, a tail water collecting device 5 and a data monitoring device 6.
In the above-mentioned visual experimental system for grouting simulation of fractured rock mass in consideration of stress effect, the device 3 for simulating stress of fractured rock mass provides a pressurized simulated ground stress environment for a fractured rock mass sample 20, and comprises a reaction frame 18, a hydraulic synchronous loading diverter valve 16, an electric oil pump 15 and a jack 22. The hydraulic synchronous loading flow divider 16 and the electric oil pump 15 form an oil supply system, which of course should also comprise an oil storage tank, which is common knowledge and is not shown in fig. 1 and will not be 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, a right steel frame and a triangular support 27. Each steel frame 30 is welded from two risers 31 and a plurality of transverse support plates 32 to provide recoil for the application of dead weight and structural stresses. The entire reaction frame 18 has a length of 1.0m and a width of 0.2m. 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 flow dividing valve 16, and the oil inlet of the hydraulic synchronous loading flow dividing 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 dead weight stress, and the left and right four jacks 22 simulate the construction 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 and has a certain pressure resistance capacity to resist the recoil of the jack 22. The front end of the jack 22 is connected with a spoke sensor 25, and then is clung to an upper organic glass plate 28, a lower organic glass plate 29 and left and right side plates 23 of the fractured rock mass testing device 4, so that the pressure on the jack 22 is transferred to the fractured rock mass specimen 20. The spoke sensors 25 monitor the simulated dead weight and structural stresses on the fractured rock mass specimen 20; the left and right side plates 23 are steel plates of 5mm thickness, and the upper and lower plexiglass plates 28 and 29 are each 5mm thick, so that the pressure provided by the jack 22 can be evenly released on the fractured rock mass specimen 20.
The electric oil pump 15 is connected with the hydraulic synchronous loading flow dividing valve 16, so that different oil pressures can be distributed according to test requirements, and different self-weight stress and construction stress can be provided.
In the above-mentioned fractured rock mass grouting simulation visualization test system considering the stress effect, the fractured rock mass test device 4 is composed 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, left and right side plates 23, a grouting pipe 19 and a grouting 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 specimen 20 is fabricated by 3D printing techniques from preset fracture geometry information. The fractured rock mass samples 20 were 500mm by 200mm in size. The 3D printing process leaves mounting holes for the grouting pipe 19. The grouting pipe 19 has a diameter of 20mm and a length of 400mm. The fractured rock mass specimen 20 is fixed with the front organic glass plate 33 and the rear organic glass plate 47 by bolts, and is sealed with the upper organic glass plate 28, the lower organic glass plate 29 and the left and right side plates 23 by sealant, so that slurry leakage is prevented.
The front and rear organic glass plates 33 and 47 as described above use PMMA transparent organic glass to observe the progress of migration and diffusion of the slurry, and four bolt holes 43 are provided thereon. The rear plexiglass plate 47 is evenly provided with a plurality of pressure taps 44, which facilitate placement of the pressure sensor 24, with a pitch of 50mm between the pressure taps 44. 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 grouting hole 46 for installing the grouting pipe 26.
In the visual experimental system for grouting simulation of fractured rock mass with consideration of stress effect, the pressure supply device 1 is composed of an air compressor 7 and a pressure limiting valve 8, the air compressor 7 provides stable and adjustable pressure for the constant pressure grouting device 2 through the pressure limiting valve 8 and a polyurethane hose 37, and the diameter of the polyurethane hose 37 is 10mm.
In the above-mentioned fracture rock mass grouting simulation visualization test system considering stress effect, as shown in fig. 1 and 2, the constant pressure grouting device 2 includes a storage tank, a bracket 10, a turbine grouting 11 and a motor 12, and the storage tank is connected with the fracture rock mass test device 4 through a polyurethane hose 37. In this embodiment, the storage tank is a stainless steel tank 9, the stainless steel tank 9 is square with dimensions 500 x 500mm. A circular hole with the diameter of 10mm is formed in the middle of the top of the stainless steel tank 9 and is used as an air inlet 40 and connected with the outlet of the pressure supply device 1; the stainless steel tank 9 is provided with a circular hole in the middle of the bottom, the diameter of the hole is 10mm, the circular hole is used as a discharge hole 41 for the slurry to flow out, the discharge hole 41 is connected with an inlet of the fractured rock mass test device 4 through a pipeline, holes are drilled at the two sides of the bottom of the stainless steel tank 9 and are 100mm away from the discharge hole 41, the hole diameter is 10mm, the circular hole is used for placing a turbine rotor hole 42 of the turbine rotor 11, the length of a turbine rotor blade of the turbine rotor 11 is 100mm, and the same peaceability of the slurry in the experimental process is guaranteed all the time. The motor 12 is connected to the turbine rotor 11 to power it. The side surface of the stainless steel tank 9 is welded with the support 10, so that the stability of the stainless steel tank 9 is ensured.
As shown in fig. 1, in the above-mentioned fracture rock mass grouting simulation visualization test system considering stress effect, the tail water collecting device 5 comprises a polyurethane hose 37, a valve 14, a water receiving tank 38 and a balance 39. The water receiving tank 38 of the tail water collecting device 5 is connected with the slurry 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 slurry discharged from the fractured rock mass testing device 4, and the balance 39 is used for weighing the mass of slurry discharged per unit time.
In the above-mentioned fracture rock mass grouting simulation visual test system considering the stress effect, 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 36. The spoke sensor 25 is connected with a computer terminal 34; the high-speed camera 35 is arranged right in front of the fractured rock mass sample 20; a pressure data acquisition display 36 is connected to the pre-specimen embedded pressure sensor 24.
A fracture rock grouting simulation visualization test method considering the effects of dead weight and structural stress comprises the following steps,
step 1: preparing a fractured rock mass specimen 20. And obtaining a random distribution function of structural surface geometric parameters (such as inclination, dip angle, trace length and the like) according to the on-site rock mass engineering fracture parameter survey data. On the basis, a square fracture network model is randomly generated by using a Monte Carlo method, the standard size of the fracture rock mass model is 500mm by 200mm, and the fracture rock mass model size can be changed according to test conditions. And printing out the fractured rock mass specimen 20 by a computer and a 3D printing device. Meanwhile, according to the field ground stress measurement data, determining the dead weight stress and the structural stress level of the depth of the rock mass in the simulated real grouting process;
step 2: the fractured rock mass specimen 20 is assembled. 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 at the position of the prefabricated bolt hole 43 by bolts, and then the grouting pipe 19 is inserted. Finally, the left side plate 23 and the right side plate 23 are mounted on the fractured rock mass sample 20, and the joints are sealed by sealant to prevent slurry leakage; placing the assembled fractured rock mass specimen 20 on the fractured rock mass stress simulator 3; the grouting pipe 19 is connected to the constant-pressure grouting device 2, and the grouting pipe 26 is connected to the tail water collecting device 5;
step 3: setting the simulated ground stress. Firstly, 8 jacks 22 are installed up, down, left and right, and the rear ends of the jacks 22 are arranged on the bearing plate 21 and 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 turned on, the hydraulic synchronous loading flow dividing valve 16 is set to distribute the oil pressures up, down, left and right, the self-weight stress is simulated by the up and down jacks 22, and the structural stress is simulated by the left and right jacks 22. Finally, performing stress calibration by using spoke sensors 25 on each jack 22 to ensure the magnitude of the applied simulated ground stress;
step 4: and installing a monitoring device. The high-speed camera 35 is arranged 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 36, and the spoke sensor 25 is connected to the computer terminal 34;
step 5: grouting test was started. Firstly, the prepared grouting slurry is injected into a stainless steel tank 9 for standby, and the turbine rotor 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. Turning on 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;
step 7: the different test conditions are changed, and the above steps 1-6 are repeated, so that the influence of parameters such as different ground stress conditions, grouting pressure, slurry viscosity, slurry gel time and the like on the slurry diffusion rule and the plugging can be obtained.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (1)
1. The method comprises the steps that a test system comprises a slurry supply device, a fractured rock mass stress simulation device, a fractured rock mass test device, a tail water collection device and a data monitoring device, wherein the fractured rock mass stress simulation device comprises a counter-force frame, jacks and an oil supply system for providing power for the jacks, the counter-force frame is a vertically placed square counter-force frame, at least one jack is arranged on the inner side of each side of the square counter-force frame, the fractured rock mass test device is arranged among a plurality of jacks in the square counter-force frame, the jacks in the upper and lower directions in the counter-force frame simulate the dead weight stress, the jacks in the left and right directions simulate the structural stress, the fractured rock mass test device is used for clamping and installing fractured rock mass samples, the slurry supply device is used for providing constant-pressure slurry for the fractured rock mass samples, the tail water collection device is used for collecting slurry flowing out of the fractured rock mass samples, and the data monitoring device is used for collecting parameter data in the fractured rock mass grouting simulation test; 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, wherein two bearing plates are arranged on the inner side of each steel frame, and a jack is arranged on each bearing plate;
the oil supply system comprises an oil pump and a hydraulic synchronous loading flow dividing valve, wherein an inlet of the hydraulic synchronous loading flow dividing valve is connected with an outlet of the oil pump, and an outlet of the hydraulic synchronous loading flow dividing valve is respectively connected to each jack;
the fractured rock mass test device consists of 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 grouting pipe connected with the inside of the fractured rock mass sample, the grouting pipe is connected with a slurry supply device, and the grouting pipe is connected with a tail water collecting device;
the front organic glass plate and the rear organic glass plate of the fractured rock mass testing device are connected through bolts, the rear organic glass plate is uniformly provided with a plurality of pressure measuring holes for placing pressure sensors, and data acquired by the pressure sensors are acquired and displayed through a pressure data acquisition display instrument;
the slurry supply device comprises a storage tank, a pressure supply device and a stirring device arranged in the storage tank, wherein the top of the storage tank is provided with an air inlet connected with the pressure supply device, the pressure supply device supplies constant air pressure to the storage tank through the air inlet, and the bottom of the storage tank is provided with a discharge port communicated with a grouting pipe;
the stirring device is a plurality of turbine rotary paddles arranged at the inner bottom of the storage tank;
the data monitoring device comprises a high-speed camera, a computer terminal and a spoke sensor, wherein data acquired by the high-speed camera and the spoke sensor are transmitted to the computer terminal through a data line for processing, the high-speed camera is used for photographing a fractured rock mass sample in the fractured rock mass test device, and the spoke sensor is arranged between the jack and the fractured rock mass test device and used for correcting the pressure applied by the jack;
the simulated visual test method for the grouting of the fractured rock mass is characterized by comprising the following steps of:
step 1, preparing a fractured rock mass sample, namely obtaining a structural plane geometric parameter random distribution function according to on-site rock mass engineering fracture parameter survey data, randomly generating a cube fracture network model by using a Monte Carlo method on the basis, printing out the fractured rock mass sample by using 3D printing equipment, and determining the dead weight stress and the structural stress level of the depth of the rock mass in the simulated real grouting process according to on-site ground stress measurement data;
step 2, assembling a fractured rock mass sample, namely firstly placing a pressure sensor in a pressure hole of a rear organic glass plate, then tightly fixing a front organic glass plate and a rear organic glass plate on the fractured rock mass sample at a precast bolt hole position by using bolts, then inserting a grouting pipe, finally installing an upper organic glass plate, a lower organic glass plate, a left side plate and a right side plate on the fractured rock mass sample, sealing joints by using sealant, preventing slurry leakage, and finishing assembling of the fractured rock mass test device; placing the fractured rock mass testing device of the assembled fractured rock mass sample on a fractured rock mass stress simulation device; the grouting pipe is connected to the slurry supply device, and the slurry outlet pipe is connected to the tail water collecting device;
step 3, setting simulated ground stress, namely firstly installing a plurality of jacks up, down, left and right, placing the rear seats of the jacks on a bearing plate, placing spoke sensors at the front ends of the jacks, and clamping with a fractured rock mass test device of an assembled fractured rock mass sample; the jacks are connected with the hydraulic synchronous loading flow dividing valve through oil pipes, then the oil pump is started, the hydraulic synchronous loading flow dividing valve is arranged to distribute the oil pressure up, down, left and right, the self-weight stress is simulated through the upper jack and the lower jack, the structural stress is simulated through the left jack and the right jack, and finally the stress calibration is performed through spoke sensors on each jack so as to ensure the magnitude of the simulated ground stress applied;
step 4, installing a monitoring device, wherein the high-speed camera frame is arranged right in front of the fractured rock mass sample; the storage tank is connected to the pressure supply device, the pressure sensor is connected to the pressure data acquisition display instrument, and the spoke sensor is connected to the computer terminal;
step 5, starting a grouting test, namely injecting the prepared grouting slurry into a storage tank for standby, starting a turbine to spin slurry to ensure the workability of the slurry, starting a pressure supply device, adjusting the grouting pressure to a preset value, performing grouting diffusion and plugging tests, starting a high-speed camera, and recording the grouting process;
step 6: stopping grouting after the slurry flows out stably, closing the data monitoring device, the pressure supply device and the fractured rock mass stress simulation device, and cleaning the fractured rock mass grouting simulation visual test system;
step 7: and (3) changing different test conditions, and repeating the steps 1-6 to obtain the influence of different ground stress conditions, grouting pressure, slurry viscosity and slurry gel time on the slurry diffusion rule and the plugging.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2020101047034 | 2020-02-20 | ||
| CN202010104703.4A CN111257538A (en) | 2020-02-20 | 2020-02-20 | Fractured rock mass grouting simulation visualization test system and method considering stress effect |
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| CN111983197B true CN111983197B (en) | 2023-06-16 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102419303B (en) * | 2011-08-15 | 2013-03-13 | 山东科技大学 | Crack grouting visualization tester under complex conditions |
| CN103411751B (en) * | 2013-08-13 | 2016-02-24 | 中国科学院武汉岩土力学研究所 | Water grouting test device is moved in a kind of visual intersection crack |
| CN106644836A (en) * | 2017-03-01 | 2017-05-10 | 山东大学 | Visual fracturing grouting model testing device and testing method thereof |
| CN107422083B (en) * | 2017-09-07 | 2023-11-28 | 祐樘(南京)软件科技有限公司 | Multifunctional fracture grouting laboratory simulation device and method |
| CN108519308B (en) * | 2018-03-27 | 2019-06-07 | 东北大学 | A kind of perforation Grouting Seepage in Rockmass slurries diffusion test method |
| CN110514808A (en) * | 2019-08-22 | 2019-11-29 | 中国科学院武汉岩土力学研究所 | A kind of rock cranny grouting test system |
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