CN117147315A - Grouting reinforcement simulation experiment device and method for coal mine fault fracture zone - Google Patents
Grouting reinforcement simulation experiment device and method for coal mine fault fracture zone Download PDFInfo
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
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- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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Abstract
The invention discloses a simulation experiment device and a simulation experiment method for grouting reinforcement of a fault crushing zone of a coal mine, wherein the simulation experiment device comprises a frame base, an axial pressure loading device, a transparent cavity, a grouting pump and a water injection pump, wherein the transparent cavity is arranged at the top of the frame base; the grouting pump is communicated with a grouting opening of the transparent cavity in a sealing way through a pipeline A, and a slurry flowmeter and a grouting pressure gauge are arranged on the pipeline A; the water injection pump is communicated with the water separator in a sealing way through a pipeline B, and a water pressure sensor is arranged at one end of the pipeline B, which is close to the water separator; the CT scanning device is arranged outside the transparent cavity. The invention can obtain the internal evolution data of the crushed simulated coal rock mass, realizes the research on the morphological change, slurry diffusion, pore change and internal microstructure change in the grouting operation process, and is convenient for obtaining the optimal grouting operation parameters.
Description
Technical Field
The invention relates to the field of grouting reinforcement of a coal mine fault crushing zone, in particular to a simulation experiment device and a simulation experiment method for grouting reinforcement of a coal mine fault crushing zone.
Background
In the coal mine exploitation process, coal rock fault fracture (called as coal mine fault fracture zone) is easy to occur, the rock mass structure of the exploitation zone can be influenced by the coal mine fault fracture zone, collapse phenomenon can occur when serious, and grouting reinforcement operation is needed to be carried out on the coal mine fault fracture zone for continuous safe operation of coal mine exploitation. FIG. 3 shows a case of a dangerous source of a fracture zone of a coal mine (for safe mining operation, stress detection is performed on upper and lower regions of the fracture zone of the coal mine), in FIG. 3, coal rock or rock is subsided and broken rock body 100 and broken rock body portion 2200 are formed, and grouting reinforcement operation is required for the fracture zone of the coal mine (the bottom of the fracture zone of the coal mine may have an aquifer and have water pressure); FIG. 7 shows another example of a coal mine fault fracture zone hazard source, where a coal rock side portion forms a fractured rock 100 and a fractured rock portion 900 (the fractured rock portion 2200 is located at the side portion of the fractured rock 100) due to subsidence faults occurring in mining, and of course, the fractured rock portion 200 may be coal rock or rock, or may be located at the side portion, top portion or middle portion of a hazard investigation scene, or may be located at the bottom portion (e.g. consider subsidence of mine road ground, grouting reinforcement is performed); the internal structure of the coal rock or rock is difficult to observe by naked eyes, so that a plurality of challenges are brought to grouting reinforcement operation, grouting reinforcement is not definitely performed, and an ideal reinforcement effect cannot be achieved if improper grouting reinforcement measures are adopted, so that blindness and uncontrollability exist in grouting reinforcement implementation; in this regard, experimental study is required to perform grouting reinforcement on the fracture zone of the coal mine to reasonably evaluate grouting reinforcement measures, strategies, grouting diffusion mechanisms and reinforcement effects, so as to evaluate the implementation scheme of the fracture zone of the coal mine and explore the optimal grouting reinforcement parameters, but in the prior art, no experimental device for grouting reinforcement on the fracture zone of the coal mine is provided, which is not beneficial to scientific study and implementation guidance of actual work of grouting reinforcement.
Disclosure of Invention
The invention aims to solve the technical problems pointed out by the background technology, and provides a simulation experiment device and a simulation experiment method for grouting reinforcement of a fault fracture zone of a coal mine.
The aim of the invention is achieved by the following technical scheme:
the utility model provides a colliery fault fracture zone grouting reinforcement simulation experiment device, includes frame base, axle load device, transparent cavity, grouting pump and water injection pump, is equipped with transparent cavity at frame base top, axle load device includes axle load axle and installs the axle load board in axle load axle tip, axle load board is located transparent cavity inside top, transparent cavity inside bottom has the water knockout drum, transparent cavity inside has placed the broken simulation coal rock mass that is located between axle load board, the water knockout drum; the side part of the transparent cavity is provided with a grouting port, the grouting pump is communicated with the grouting port in a sealing way through a pipeline A, and a slurry flowmeter and a grouting pressure gauge are arranged on the pipeline A; the water injection pump is communicated with the water separator in a sealing way through a pipeline B, and a water pressure sensor is arranged at one end, close to the water separator, of the pipeline B; and a CT scanning device is arranged outside the transparent cavity.
In order to better realize the invention, the invention also comprises a pressure relief water tank, and a high-speed camera is arranged outside the transparent cavity; the pressure relief water tank is communicated with the pipeline A through a pipeline C, and a water valve B is arranged on the pipeline C.
The invention further comprises a CT scanning data acquisition module and a camera data acquisition module, wherein the CT scanning data acquisition module is connected with the CT scanning device, and the camera data acquisition module is connected with the high-speed camera; the bottom of the axial pressure loading plate is provided with a plurality of pressure sensors.
Preferably, the pipeline B is provided with a water injection pressure gauge, a water valve A and a liquid flowmeter.
In order to better realize the invention, the invention also comprises a grouting reinforcement control acquisition system, wherein the CT scanning data acquisition module and the camera data acquisition module are positioned in the grouting reinforcement control acquisition system, the grouting reinforcement control acquisition system also comprises an axial pressure loading control module, a grouting control and acquisition module, a water injection control and acquisition module and a data processing center, the axial pressure loading control module is respectively connected with an axial pressure loading device and a pressure sensor, and the axial pressure loading control module is used for controlling the axial pressure loading device to apply main axial pressure to the crushed simulated coal rock mass through an axial pressure loading plate according to set main axial pressure and acquire main axial pressure loading data monitored by the pressure sensor; the grouting control and acquisition module is respectively connected with the grouting pump, the slurry flowmeter and the grouting pressure gauge, and is used for acquiring slurry flow data of the slurry flowmeter and grouting pressure data of the grouting pressure gauge, and controlling grouting operation of the grouting pump; the water injection control and acquisition module is respectively connected with the water injection pump, the liquid flowmeter, the water injection pressure gauge and the water pressure sensor, and is used for acquiring water injection flow data of the liquid flowmeter and water pressure data of the water pressure sensor, and controlling water injection work of the water injection pump; the CT scanning data acquisition module is used for acquiring CT scanning data of the CT scanning device on the broken simulated coal rock mass, and the camera data acquisition module is used for acquiring image data of the high-speed camera on the broken simulated coal rock mass; the data processing center is used for recording experimental parameters and internal evolution data of the crushed simulated coal rock mass under the experimental parameters, and the experimental parameters comprise spindle pressure, water pressure, slurry flow, grouting pressure and grouting time.
Preferably, the water valve A and the water valve B are electromagnetic valves, and the water injection control and acquisition module comprises a water pressure stabilization control module which is respectively connected with the water pressure sensor, the water valve A and the water valve B.
Preferably, the invention further comprises a fixed frame arranged at the top of the frame base, and the CT scanning device and the axial pressure loading device are fixed on the fixed frame; the water separator is a water separation tank, the bottom of the water separation tank is communicated with the pipeline B in a sealing way, and a plurality of water separation holes communicated with the inner cavity of the water separation tank are uniformly distributed on the top plate of the water separation tank.
A simulation experiment method for grouting reinforcement of a coal mine fault fracture zone comprises the following steps:
s1, sampling or simulating preparation is carried out according to a fault area of a mine research area to obtain a broken simulated coal rock body, and stress data and water pressure data of the fault area of the mine research area are measured to obtain spindle pressure and water pressure corresponding to a simulation experiment; placing the crushed simulated coal rock mass in the transparent cavity, wherein the crushed simulated coal rock mass is positioned between the axial pressure loading plate and the water separator, the end part of the pipeline A is communicated with the grouting opening in a sealing way, the pipeline B is communicated with the water separator in a sealing way, the CT scanning device completely covers the crushed simulated coal rock mass for scanning, and the high-speed camera completely covers the crushed simulated coal rock mass for shooting;
S2, controlling an axial pressure loading control module of the grouting reinforcement control acquisition system to drive an axial pressure loading plate to apply main axial pressure to the crushed simulated coal rock body by an axial pressure loading device, and monitoring the applied main axial pressure by a pressure sensor and feeding back to the axial pressure loading control module; the water injection control and acquisition module of the grouting reinforcement control acquisition system controls the water injection pump to perform water injection operation, the water separator applies water pressure to the broken simulated coal rock mass in a simulation mode, and the water pressure sensor monitors the water pressure in the pipeline B and feeds the water pressure back to the water injection control and acquisition module; the shaft pressure loading device and the water injection pump keep working and fine adjustment until the applied spindle pressure and water pressure are stable and reach the spindle pressure and water pressure corresponding to the simulation experiment;
s3, controlling a grouting pump to perform grouting operation by a grouting control and acquisition module of the grouting reinforcement control acquisition system, wherein the grouting control and acquisition module acquires the slurry flow Q1 of a slurry flowmeter and the grouting pressure F1 of a grouting pressure gauge; the CT scanning data acquisition module acquires CT scanning data of the CT scanning device on the broken simulated coal rock mass according to time sequences, and the camera data acquisition module acquires image data of the high-speed camera on the broken simulated coal rock mass according to time sequences; the data processing center records experimental parameters and internal evolution data of the crushed simulated coal rock mass under the experimental parameters, wherein the experimental parameters comprise spindle pressure, water pressure, slurry flow, grouting pressure and grouting time, and the internal evolution data of the crushed simulated coal rock mass comprise morphological changes, slurry diffusion, pore changes and internal microstructure changes in time sequence;
S4, setting different grouting pressures and slurry flow rates or/and adjusting slurry proportions by the grouting reinforcement control acquisition system, and carrying out experimental treatment on similar crushed simulated coal and rock masses according to the steps S1-S3 to sequentially obtain internal evolution data of the crushed simulated coal and rock masses.
A simulation experiment method for grouting reinforcement of a coal mine fault fracture zone comprises the following steps:
s10, sampling or simulating according to a fault area of a mine research area to obtain two crushed simulated coal and rock bodies, dividing the two crushed simulated coal and rock bodies into an experimental coal and rock body and a control coal and rock body, and performing mechanical property test on the control coal and rock body to obtain a control test result, wherein the mechanical property test comprises a coal and rock body strength test; measuring fault area stress data and water pressure data of a mine research area and obtaining spindle pressure and water pressure corresponding to a simulation experiment; placing an experimental coal rock body in the transparent cavity, wherein the experimental coal rock body is positioned between the axial pressure loading plate and the water separator, the end part of the pipeline A is communicated with the grouting opening in a sealing way, the pipeline B is communicated with the water separator in a sealing way, the CT scanning device completely covers the experimental coal rock body for scanning, and the high-speed camera completely covers the experimental coal rock body for shooting;
s20, controlling a shaft pressure loading control module of the grouting reinforcement control acquisition system to drive a shaft pressure loading plate to apply main shaft pressure to the experimental coal rock mass by a shaft pressure loading device, and monitoring the applied main shaft pressure by a pressure sensor and feeding back to the shaft pressure loading control module; the water injection control and acquisition module of the grouting reinforcement control acquisition system controls the water injection pump to perform water injection operation, the water distributor applies water pressure to the experimental coal rock mass simulation, and the water pressure sensor monitors the water pressure in the pipeline B and feeds the water pressure back to the water injection control and acquisition module; the shaft pressure loading device and the water injection pump keep working and fine adjustment until the applied spindle pressure and water pressure are stable and reach the spindle pressure and water pressure corresponding to the simulation experiment;
S30, controlling a grouting pump to perform grouting operation by a grouting control and acquisition module of the grouting reinforcement control acquisition system, wherein the grouting control and acquisition module acquires the slurry flow Q1 of a slurry flowmeter and the grouting pressure F1 of a grouting pressure gauge; the CT scanning data acquisition module acquires CT scanning data of the CT scanning device on the experimental coal rock mass according to time sequences, and the camera data acquisition module acquires image data of the high-speed camera on the experimental coal rock mass according to time sequences; the data processing center records experimental parameters and internal evolution data of the crushed simulated coal rock mass under the experimental parameters, wherein the experimental parameters comprise spindle pressure, water pressure, slurry flow, grouting pressure and grouting time, and the internal evolution data of the crushed simulated coal rock mass comprise morphological changes, slurry diffusion, pore changes and internal microstructure changes in time sequence;
carrying out mechanical property test on the experimental coal rock mass after grouting to obtain an experimental test result, and comparing and analyzing the experimental test result with a control test result to obtain grouting lifting effect data;
s40, setting different grouting pressures and slurry flow rates or/and adjusting slurry proportions by the grouting reinforcement control acquisition system, carrying out experiments according to the steps S10-S30, sequentially obtaining internal evolution data and grouting lifting effect data of the crushed simulated coal rock mass, and screening to obtain the optimal grouting amount, grouting pressure, grouting time or/and slurry proportions.
Preferably, the data processing center performs three-dimensional reconstruction based on the initial image data and CT scanning data to obtain a three-dimensional coal-rock mass containing initial pores and internal microstructures, extracts the time-series CT scanning data and the time-series image data concerning pore and internal microstructure characteristic changes, and visually expresses the internal evolution data of the crushing simulation coal-rock mass in the three-dimensional coal-rock mass according to the time series.
Compared with the prior art, the invention has the following advantages:
(1) According to the invention, CT scanning data are obtained by scanning operation of the grouting process of the crushed simulated coal rock body through the CT scanning device, image data are obtained by shooting operation of the grouting process of the crushed simulated coal rock body through the high-speed camera, and the two data are combined with each other to know the internal evolution data of the crushed simulated coal rock body, so that the research on the morphological change, slurry diffusion, pore change and internal microstructure change in the grouting process is realized.
(2) According to the invention, experimental parameters such as different grouting pressures, slurry flow rates or slurry proportion adjustment can be adjusted, and then corresponding internal evolution data of the crushed simulated coal rock mass can be obtained; and mechanical property test comparison tests and pore change comparison measurements are respectively carried out before and after grouting, the optimal grouting quantity, grouting pressure, grouting time and other operation parameters are comprehensively screened, the reasonable grouting reinforcement measures, strategies, grouting diffusion mechanisms and evaluation reinforcement effects are conveniently obtained through experimental study, and the method has important significance on the practical work guidance significance of grouting reinforcement and the treatment of a coal mine fault fracture zone.
(3) According to the invention, through single and combined stress simulation loading of spindle pressure or water pressure, grouting simulation and internal structure change detection of the crushed simulated coal and rock mass are carried out, data measurement of the crushed simulated coal and rock mass before and after grouting is realized, internal evolution data of the crushed simulated coal and rock mass is obtained, simulation experiment research, data comparison measurement and evolution process exploration of a coal mine fault crushing zone are realized, and data support and scientific experiment means are provided for grouting reinforcement treatment of the coal mine fault crushing zone.
(4) The data processing center performs three-dimensional reconstruction based on the initial image data and CT scanning data to obtain the three-dimensional coal-rock mass containing the initial pores and the internal microstructure, can extract pore change, internal microstructure characteristic change and the like, visually expresses and breaks the internal evolution data of the simulated coal-rock mass according to time sequence, and is convenient for visually observing the internal evolution process.
Drawings
FIG. 1 is a schematic diagram of a structure of a broken simulated coal rock mass reinforcement experiment performed in accordance with the present invention;
FIG. 2 is a schematic diagram of crushing a simulated coal rock mass for high-speed camera shooting in an embodiment;
FIG. 3 is a schematic drawing showing sampling of a first exemplary crushed simulated coal rock mass in an embodiment;
FIG. 4 is a schematic block diagram of a grouting reinforcement control acquisition system according to an embodiment;
FIG. 5 is a graph of N (r) -r double logarithm in an example;
FIG. 6 is a graph illustrating a fault fracture zone rock mass size distribution curve in an example embodiment;
FIG. 7 is a schematic drawing showing a sample of a second exemplary fractured simulated coal rock mass according to an embodiment;
fig. 8 is a schematic structural view of another structure for carrying out a crushing simulation coal-rock mass reinforcement experiment in the embodiment.
Wherein, the names corresponding to the reference numerals in the drawings are:
100-broken rock mass, 200-broken rock mass part, 1-fixed frame, 2-CT scanning device, 3-broken simulated coal rock mass, 4-axial pressure loading device, 41-axial pressure loading plate, 42-axial pressure loading shaft, 5-frame base, 6-grouting pump, 7-relief valve A, 8-grouting pressure gauge, 9-slurry flowmeter, 10-water injection pump, 11-CT scanning data acquisition module, 12-axial pressure loading control module, 13-temperature sensor, 14-transparent cavity, 15-high-speed camera, 16-camera data acquisition module, 17-water pressure sensor, 18-pressure sensor, 19-liquid flowmeter, 20-water injection pressure gauge, 21-water valve A, 22-water valve B, 23-water knockout drum, 24-relief valve B, 25-pressure relief water tank.
Detailed Description
The invention is further illustrated by the following examples:
example 1
The utility model provides a colliery fault section slip casting consolidates simulation experiment device, including frame base 5, axle pressure loading device 4 (axle pressure loading device 4 is unipolar stress loading device), transparent cavity 14, grouting pump 6 and water injection pump 10, the frame base 5 top is equipped with transparent cavity 14, axle pressure loading device 4 includes axle pressure loading axle and installs the axle pressure loading board 41 in axle pressure loading axle 42 tip (axle pressure loading board 41 is the loading dish that carries out mechanical loading to broken analog coal rock mass 3, axle pressure loading axle promotes axle pressure loading board 41 mechanical loading motion and carries out the axial main stress loading operation to broken analog coal rock mass 3), axle pressure loading board 41 is located transparent cavity 14 inside top, transparent cavity 14 inside bottom has water knockout drum 23, transparent cavity 14 inside has been placed the broken analog coal rock mass 3 that is located between axle pressure loading board 41, water knockout drum 23 (in the case of colliery research area, broken analog coal rock mass 3 is obtained according to the regional sampling or real simulation preparation of mine research area). The side of the transparent cavity 14 is provided with a grouting opening, the grouting pump 6 is communicated with the grouting opening in a sealing way through a pipeline A, and a slurry flowmeter 9 and a grouting pressure gauge 8 are arranged on the pipeline A (preferably, a pressure reducing valve A7 capable of reducing pressure and adjusting is also arranged on the pipeline A). The water injection pump 10 is communicated with the water separator 23 in a sealing way through a pipeline B, one end of the pipeline B, which is close to the water separator 23, is provided with a water pressure sensor 17 (preferably, the pipeline B is provided with a water injection pressure gauge 20, a water valve A21 and a liquid flowmeter 19, and the pipeline B is also provided with a pressure reducing valve B24 capable of reducing pressure and adjusting). The CT scanning device 2 which completely covers the broken simulated coal rock mass 3 for scanning is arranged outside the transparent cavity 14; the water injection pump 10, the water pressure sensor 17, the pipeline B, the water injection pressure gauge 20 and the like form a water pressure simulation environment (meanwhile, water seepage research is also convenient). Fig. 1 shows a crushed simulated coal and rock mass reinforcing experimental device in an application scenario (the application scenario is that the top of the crushed simulated coal and rock mass 3 has an axial main stress, and the bottom of the crushed simulated coal and rock mass has a water pressure of an aquifer), and of course, the embodiment can also be applied to the following two main application scenarios, as shown in fig. 8, the first application scenario is that the top of the crushed simulated coal and rock mass 3 has an axial main stress, and the bottom of the crushed simulated coal and rock mass 3 has an axial main stress, and in this case, the hydraulic simulation environments such as a water injection pump 10, a water pressure sensor 17, a pipeline B, a water injection pressure gauge 20, and the like are removed and replaced by an axial pressure loading device 4 (that is, an axial main stress environment is also constructed at the bottom of the crushed simulated coal and rock mass 3, and the vertical main stress environments are all present); the second application scene is that the crushing simulation coal rock mass 3 only has axial main stress at the top, and then the water injection pump 10, the water pressure sensor 17, the pipeline B, the water injection pressure gauge 20 and other water pressure simulation environments are removed; of course, the invention can also expand other application scenes, such as the water pressure simulation environment when the crushed simulated coal rock mass 3 is loaded up and down. The invention is implemented and described by crushing the water pressure application scene with axial main stress at the top and water bearing layer at the bottom of the simulated coal rock mass 3. In order to facilitate the temperature detection of the crushed simulated coal rock mass 3, a temperature sensor 13 for detecting the temperature of the crushed simulated coal rock mass 3 can be inserted and installed on the transparent cavity 14.
In some embodiments, the invention further comprises a pressure relief water tank 25 (when the water pressure sensor 17 detects that the water pressure exceeds a required water pressure value, a water valve B22 can be opened to release a part of water in the water separator 23, the water pressure sensor 17 is observed until the water pressure is reduced to the required water pressure value), and a high-speed camera 15 which completely covers the broken simulated coal rock mass 3 for shooting is further arranged outside the transparent cavity 14; when the high-speed camera 15 is installed, it is necessary to consider the problem that the high-speed camera 15 and the CT scanner 2 do not block each other (the high-speed camera 15 may be integrated in the CT scanner 2, or the scanning direction of the CT scanner 2 may be staggered from the scanning direction of the high-speed camera 15, for example, the scanning direction of the CT scanner 2 is a left-right perspective scan with respect to the crushed simulated coal rock 3, and the scanning direction of the high-speed camera 15 is a front-rear scan). The pressure release water tank 25 is communicated with the pipeline A through a pipeline C, a water valve B22 is arranged on the pipeline C, the water pressure sensor 17 is positioned between the connecting position of the pipeline C and the pipeline B and the water separator 23 (as shown in fig. 1, the water pressure sensor 17 is close to the end position of the pipeline B, one end side of the water pressure sensor 17 is close to the connecting position of the pipeline C and the pipeline B, and the other end side of the water pressure sensor 17 is close to the water separator 23).
In some embodiments, the present invention further comprises a CT scan data acquisition module 11 and a camera data acquisition module 16, wherein the CT scan data acquisition module 11 is connected to the CT scanner 2 and the camera data acquisition module 16 is connected to the high speed camera 15. The bottom of the axle load plate 41 is provided with a plurality of pressure sensors 18.
In some preferred embodiments, as shown in fig. 4, the invention further comprises a grouting reinforcement control acquisition system, wherein the CT scanning data acquisition module 11 and the camera data acquisition module 16 are positioned in the grouting reinforcement control acquisition system, the grouting reinforcement control acquisition system further comprises an axle pressure loading control module 12, a grouting control and acquisition module, a water injection control and acquisition module and a data processing center, the axle pressure loading control module 12 is respectively connected with the axle pressure loading device 4 and the pressure sensor 18, and the axle pressure loading control module 12 is used for controlling the axle pressure loading device 4 to apply the axle pressure to the crushed simulated coal rock mass 3 according to the set axle pressure through the axle pressure loading plate 41 and acquire the axle pressure loading data monitored by the pressure sensor 18. The grouting control and acquisition module is respectively connected with the grouting pump 6, the slurry flowmeter 9 and the grouting pressure gauge 8, and is used for acquiring slurry flow data of the slurry flowmeter 9 and grouting pressure data of the grouting pressure gauge 8, and is also used for controlling grouting operation of the grouting pump 6. The water injection control and acquisition module is respectively connected with the water injection pump 10, the liquid flowmeter 19, the water injection pressure gauge 20 and the water pressure sensor 17, and is used for acquiring water injection flow data of the liquid flowmeter 19 and water pressure data of the water pressure sensor 17, and is also used for controlling water injection work of the water injection pump 10. The CT scanning data acquisition module 11 is used for acquiring CT scanning data of the CT scanning device 2 on the broken simulated coal rock mass 3, and the camera data acquisition module 16 is used for acquiring image data of the high-speed camera 15 on the broken simulated coal rock mass 3. The data processing center is used for recording experimental parameters and internal evolution data of the broken simulated coal rock mass under the experimental parameters, and the experimental parameters comprise spindle pressure, water pressure, slurry flow, grouting pressure and grouting time. The water valve A21 and the water valve B22 are preferably electromagnetic valves, and the water injection control and acquisition module comprises a water pressure stability control module which is respectively connected with the water pressure sensor 17, the water valve A21 and the water valve B22, and the water pressure stability control module controls the opening and closing of the water valve A21 and the water valve B22 based on water pressure data detected by the water pressure sensor 17 so as to maintain stable water pressure conditions.
In some preferred embodiments, the invention further comprises a fixed frame 1 arranged on top of the frame base 5, and the ct scanning device 2 and the axial compression loading device 4 are fixed on the fixed frame 1. Preferably, the water separator 23 is a water separation tank, the bottom of the water separation tank is communicated with the pipeline B in a sealing way, and a plurality of water separation holes communicated with the inner cavity of the water separation tank are uniformly distributed on the top plate of the water separation tank.
A simulation experiment method for grouting reinforcement of a coal mine fault fracture zone comprises the following steps:
s1, sampling or simulating preparation is carried out according to a fault area of a mine research area to obtain a broken simulated coal rock mass 3, and stress data and water pressure data of the fault area of the mine research area are measured to obtain spindle pressure and water pressure corresponding to a simulation experiment. The broken simulated coal and rock mass 3 is placed in the transparent cavity 14, the broken simulated coal and rock mass 3 is positioned between the axial pressure loading plate 41 and the water separator 23, the end part of the pipeline A is communicated with the grouting opening in a sealing manner, the pipeline B is communicated with the water separator 23 in a sealing manner, the CT scanning device 2 is enabled to completely cover the broken simulated coal and rock mass 3 for scanning, and the high-speed camera 15 is enabled to completely cover the broken simulated coal and rock mass 3 for shooting.
If the simulated preparation of the crushed simulated coal rock mass 3 is to be performed, the self-similarity characteristics between the crushed simulated coal rock mass 3 and the fault region in statistical sense need to be considered or checked, for example, as follows: the fault zone broken rock mass accumulation body is a split body, and the scale r and the number N (r) of broken rock mass broken stones meet the following relation:
N(r)＝Cr -D (1)
ln N(r)＝D ln(1/r)+ln C (2)
Wherein N (r) is the number of rock masses with characteristic sizes larger than r; c is a material constant; thus the fracture dimension D of the fault zone fractured rock mass is
D＝ln(N i /N i+1 )/ln(r i /r i+1 ) (3)
Wherein r is i ，r i+1 Characteristic dimensions of the dispersion of the collapse zone rock mass are respectively; n (N) i ，N i+1 Respectively correspond to r i And r i+1 The number of goaf caving zone rock masses at the characteristic dimension. In order to obtain the size distribution of the fault zone rock mass, only the dimension D of the fault zone broken rock mass and any one of the characteristic dimensions and the corresponding number of fault zone rock masses need to be determined. The fractal dimension of the broken rock mass of the fault breaking zone is generally 2.53-2.98; the fractal dimension is small, the block degree of the broken rock mass is quite different, the block degree composition is quite uneven, and the void penetrability is poor; when the fractal dimension is large, the blocking degree of the broken rock mass is uniform, and the gap penetrability is good. The fracture zone dimension was determined to be 2.5 based on fracture zone borehole peeping. Calculation of feature size r with reference to formulas established in the literature i And N i . Considering that the fracture zone crushing mode is basically consistent with the roof crushing mode, the roof primary pressure determination (when N i When=2).
Wherein L is 1 Step distance is pressed for basic top period; l (L) 2 Is the span formed in the stope after the basic roof fracture; m is the basic top thickness; l is the working face width.
Such as: zhao Gu the two-ore cycle pressing step distance is 20.1m, the working face width is 200m, the basic top thickness is 13.2m, and L can be calculated according to the formula (5) 2 23.88m. N (N) i When=2, r i 14.69m. According to formula (3), the different sizes r and the corresponding numbers N (r) of crushed rock bodies can be obtained, and the least square method is used for fitting the data, so that the linear correlation between 1N N (r) and 1N (1/r) is found, as shown in fig. 5. The cumulative distribution of the volumes of crushed rock mass of the subsidence belt is shown in fig. 6.
S2, an axial pressure loading control module 12 of the grouting reinforcement control acquisition system controls an axial pressure loading device 4 to drive an axial pressure loading plate 41 to apply main axial pressure to the crushed simulated coal rock mass 3, and a pressure sensor 18 monitors the applied main axial pressure and feeds the main axial pressure back to the axial pressure loading control module 12. The water injection control and acquisition module of the grouting reinforcement control acquisition system controls the water injection pump 10 to perform water injection operation, the water separator 23 applies water pressure to the broken simulated coal rock mass 3 in a simulation mode, and the water pressure sensor 17 monitors the water pressure in the pipeline B and feeds the water pressure back to the water injection control and acquisition module. The shaft pressure loading device 4 and the water injection pump 10 keep working and fine-tuning until the applied shaft pressure and water pressure are stable and reach the shaft pressure and water pressure corresponding to the simulation experiment.
And S3, controlling the grouting pump 6 to perform grouting operation by a grouting control and acquisition module of the grouting reinforcement control acquisition system, wherein the grouting control and acquisition module acquires the slurry flow Q1 of the slurry flowmeter 9 and the grouting pressure F1 of the grouting pressure gauge 8. The CT scan data acquisition module 11 acquires CT scan data of the CT scanner 2 for the crushed simulated coal rock mass 3 in time series, and the camera data acquisition module 16 acquires image data of the high-speed camera 15 for the crushed simulated coal rock mass 3 in time series. The data processing center records experimental parameters and internal evolution data of the crushed simulated coal rock mass under the experimental parameters, wherein the experimental parameters comprise spindle pressure, water pressure, slurry flow, grouting pressure and grouting time, and the internal evolution data of the crushed simulated coal rock mass comprise morphological changes, slurry diffusion, pore changes and internal microstructure changes in time sequence; the morphological changes and a small amount of externally visible structural changes are derived from image data captured by the high-speed camera 15, and the slurry diffusion, pore changes, and internal microstructure changes are mainly derived from CT scan data of the CT scanner 2.
S4, setting different grouting pressures and slurry flow rates or/and adjusting slurry proportions by the grouting reinforcement control acquisition system, and carrying out experimental treatment on similar crushed simulated coal and rock mass 3 according to the steps S1-S3 to sequentially obtain internal evolution data of the crushed simulated coal and rock mass.
In some embodiments, the data processing center performs three-dimensional reconstruction based on the initial image data and the CT scan data to obtain a three-dimensional coal-rock mass including an initial pore and an internal microstructure (pore quantitative description can be performed through the CT scan data, a picture of a high-speed camera is processed by using image processing software, the three-dimensional reconstruction model is further corrected, pore structure changes in a fault broken coal-rock mass grouting process and broken coal-rock mass structure evolution characteristics in the grouting process are finally obtained), the CT scan data of a time sequence and the image data of the time sequence are extracted for pore focusing and internal microstructure characteristic changes, and broken simulated coal-rock mass internal evolution data is visually expressed in the three-dimensional coal-rock mass according to the time sequence. In some embodiments, statistical calculations may be performed on the initial porosity of the crushed simulated coal rock mass 3, and in combination with slurry diffusion data, impact data of different porosities on grouting effects may be derived.
Example two
The utility model provides a colliery fault section slip casting consolidates simulation experiment device, including frame base 5, axle pressure loading device 4 (axle pressure loading device 4 is unipolar stress loading device), transparent cavity 14, grouting pump 6 and water injection pump 10, the frame base 5 top is equipped with transparent cavity 14, axle pressure loading device 4 includes axle pressure loading axle and installs the axle pressure loading board 41 in axle pressure loading axle 42 tip (axle pressure loading board 41 is the loading dish that carries out mechanical loading to broken analog coal rock mass 3, axle pressure loading axle promotes axle pressure loading board 41 mechanical loading motion and carries out the axial main stress loading operation to broken analog coal rock mass 3), axle pressure loading board 41 is located transparent cavity 14 inside top, transparent cavity 14 inside bottom has water knockout drum 23, transparent cavity 14 inside has been placed the broken analog coal rock mass 3 that is located between axle pressure loading board 41, water knockout drum 23 (in the case of colliery research area, broken analog coal rock mass 3 is obtained according to the regional sampling or real simulation preparation of mine research area). The side of the transparent cavity 14 is provided with a grouting opening, the grouting pump 6 is communicated with the grouting opening in a sealing way through a pipeline A, and a slurry flowmeter 9 and a grouting pressure gauge 8 are arranged on the pipeline A (preferably, a pressure reducing valve A7 capable of reducing pressure and adjusting is also arranged on the pipeline A). The water injection pump 10 is communicated with the water separator 23 in a sealing way through a pipeline B, one end of the pipeline B, which is close to the water separator 23, is provided with a water pressure sensor 17 (preferably, the pipeline B is provided with a water injection pressure gauge 20, a water valve A21 and a liquid flowmeter 19, and the pipeline B is also provided with a pressure reducing valve B24 capable of reducing pressure and adjusting). The CT scanning device 2 which completely covers the broken simulated coal rock mass 3 for scanning is arranged outside the transparent cavity 14; the water injection pump 10, the water pressure sensor 17, the pipeline B, the water injection pressure gauge 20 and the like form a water pressure simulation environment (meanwhile, water seepage research is also convenient). Fig. 1 shows a broken simulated coal and rock mass reinforcing experimental device in an application scenario (the application scenario is that the top of the broken simulated coal and rock mass 3 has an axial main stress, and the bottom of the broken simulated coal and rock mass has a water pressure of an aquifer), of course, the embodiment can also be applied to two main application scenarios, wherein the first application scenario is that the top of the broken simulated coal and rock mass 3 has an axial main stress, and the bottom of the broken simulated coal and rock mass 3 has an axial main stress, and in this case, the hydraulic simulation environments such as a water injection pump 10, a water pressure sensor 17, a pipeline B, a water injection pressure gauge 20 and the like are removed and replaced by an axial pressure loading device 4 (namely, an axial main stress environment is also constructed at the bottom of the broken simulated coal and rock mass 3, and at the moment, the broken simulated coal and rock mass 3 has an axial main stress environment at the top and bottom); the second application scene is that the crushing simulation coal rock mass 3 only has axial main stress at the top, and then the water injection pump 10, the water pressure sensor 17, the pipeline B, the water injection pressure gauge 20 and other water pressure simulation environments are removed; of course, the invention can also expand other application scenes, such as the water pressure simulation environment when the crushed simulated coal rock mass 3 is loaded up and down. The invention is implemented and described by crushing the water pressure application scene with axial main stress at the top and water bearing layer at the bottom of the simulated coal rock mass 3.
In some embodiments, the invention further comprises a pressure relief water tank 25 (when the water pressure sensor 17 detects that the water pressure exceeds a required water pressure value, a water valve B22 can be opened to release a part of water in the water separator 23, the water pressure sensor 17 is observed until the water pressure is reduced to the required water pressure value), and a high-speed camera 15 which completely covers the broken simulated coal rock mass 3 for shooting is further arranged outside the transparent cavity 14; when the high-speed camera 15 is installed, it is necessary to consider the problem that the high-speed camera 15 and the CT scanner 2 do not block each other (the high-speed camera 15 may be integrated in the CT scanner 2, or the scanning direction of the CT scanner 2 may be staggered from the scanning direction of the high-speed camera 15, for example, the scanning direction of the CT scanner 2 is a left-right perspective scan with respect to the crushed simulated coal rock 3, and the scanning direction of the high-speed camera 15 is a front-rear scan). The pressure release water tank 25 is communicated with the pipeline A through a pipeline C, a water valve B22 is arranged on the pipeline C, the water pressure sensor 17 is positioned between the connecting position of the pipeline C and the pipeline B and the water separator 23 (as shown in fig. 1, the water pressure sensor 17 is close to the end position of the pipeline B, one end side of the water pressure sensor 17 is close to the connecting position of the pipeline C and the pipeline B, and the other end side of the water pressure sensor 17 is close to the water separator 23).
In some embodiments, the present invention further comprises a CT scan data acquisition module 11 and a camera data acquisition module 16, wherein the CT scan data acquisition module 11 is connected to the CT scanner 2 and the camera data acquisition module 16 is connected to the high speed camera 15. The bottom of the axle load plate 41 is provided with a plurality of pressure sensors 18.
In some preferred embodiments, as shown in fig. 4, the invention further comprises a grouting reinforcement control acquisition system, wherein the CT scanning data acquisition module 11 and the camera data acquisition module 16 are positioned in the grouting reinforcement control acquisition system, the grouting reinforcement control acquisition system further comprises an axle pressure loading control module 12, a grouting control and acquisition module, a water injection control and acquisition module and a data processing center, the axle pressure loading control module 12 is respectively connected with the axle pressure loading device 4 and the pressure sensor 18, and the axle pressure loading control module 12 is used for controlling the axle pressure loading device 4 to apply the axle pressure to the crushed simulated coal rock mass 3 according to the set axle pressure through the axle pressure loading plate 41 and acquire the axle pressure loading data monitored by the pressure sensor 18. The grouting control and acquisition module is respectively connected with the grouting pump 6, the slurry flowmeter 9 and the grouting pressure gauge 8, and is used for acquiring slurry flow data of the slurry flowmeter 9 and grouting pressure data of the grouting pressure gauge 8, and is also used for controlling grouting operation of the grouting pump 6. The water injection control and acquisition module is respectively connected with the water injection pump 10, the liquid flowmeter 19, the water injection pressure gauge 20 and the water pressure sensor 17, and is used for acquiring water injection flow data of the liquid flowmeter 19 and water pressure data of the water pressure sensor 17, and is also used for controlling water injection work of the water injection pump 10. The CT scanning data acquisition module 11 is used for acquiring CT scanning data of the CT scanning device 2 on the broken simulated coal rock mass 3, and the camera data acquisition module 16 is used for acquiring image data of the high-speed camera 15 on the broken simulated coal rock mass 3. The data processing center is used for recording experimental parameters and internal evolution data of the broken simulated coal rock mass under the experimental parameters, and the experimental parameters comprise spindle pressure, water pressure, slurry flow, grouting pressure and grouting time. The water valve A21 and the water valve B22 are preferably electromagnetic valves, and the water injection control and acquisition module comprises a water pressure stability control module which is respectively connected with the water pressure sensor 17, the water valve A21 and the water valve B22, and the water pressure stability control module controls the opening and closing of the water valve A21 and the water valve B22 based on water pressure data detected by the water pressure sensor 17 so as to maintain stable water pressure conditions.
In some preferred embodiments, the invention further comprises a fixed frame 1 arranged on top of the frame base 5, and the ct scanning device 2 and the axial compression loading device 4 are fixed on the fixed frame 1. Preferably, the water separator 23 is a water separation tank, the bottom of the water separation tank is communicated with the pipeline B in a sealing way, and a plurality of water separation holes communicated with the inner cavity of the water separation tank are uniformly distributed on the top plate of the water separation tank.
The embodiment adopts the simulation experiment device for grouting reinforcement of the fracture zone of the coal mine, and the simulation experiment method for grouting reinforcement of the fracture zone of the coal mine comprises the following steps:
s10, sampling or simulating according to a fault area of a mine research area to obtain two crushed simulated coal and rock bodies 3, dividing the two crushed simulated coal and rock bodies 3 into experimental coal and rock bodies and reference coal and rock bodies, and performing mechanical property test on the reference coal and rock bodies to obtain a reference test result, wherein the mechanical property test comprises a coal and rock body strength test. And measuring fault area stress data and water pressure data of the mine research area, and obtaining the spindle pressure and the water pressure corresponding to the simulation experiment. The experimental coal rock mass is placed in the transparent cavity 14, is positioned between the axial pressure loading plate 41 and the water separator 23, the end part of the pipeline A is communicated with the grouting opening in a sealing way, the pipeline B is communicated with the water separator 23 in a sealing way, the CT scanning device 2 is enabled to cover the experimental coal rock mass completely for scanning, and the high-speed camera 15 is enabled to cover the experimental coal rock mass completely for shooting.
S20, an axial pressure loading control module 12 of the grouting reinforcement control acquisition system controls an axial pressure loading device 4 to drive an axial pressure loading plate 41 to apply main axial pressure to the experimental coal rock mass, and a pressure sensor 18 monitors the applied main axial pressure and feeds the main axial pressure back to the axial pressure loading control module 12. The water injection control and acquisition module of the grouting reinforcement control acquisition system controls the water injection pump 10 to perform water injection operation, the water separator 23 applies water pressure to experimental coal and rock mass simulation, and the water pressure sensor 17 monitors the water pressure in the pipeline B and feeds the water pressure back to the water injection control and acquisition module. The shaft pressure loading device 4 and the water injection pump 10 keep working and fine-tuning until the applied shaft pressure and water pressure are stable and reach the shaft pressure and water pressure corresponding to the simulation experiment.
S30, a grouting control and acquisition module of the grouting reinforcement control acquisition system controls the grouting pump 6 to perform grouting operation, and the grouting control and acquisition module acquires the grouting flow Q1 of the grouting flowmeter 9 and the grouting pressure F1 of the grouting pressure gauge 8. The CT scan data acquisition module 11 acquires CT scan data of the CT scanner 2 for an experimental coal rock mass in time series, and the camera data acquisition module 16 acquires image data of the high-speed camera 15 for the experimental coal rock mass in time series. The data processing center records experimental parameters and internal evolution data of the crushed simulated coal rock mass under the experimental parameters, wherein the experimental parameters comprise spindle pressure, water pressure, slurry flow, grouting pressure and grouting time, and the internal evolution data of the crushed simulated coal rock mass comprise morphological changes, slurry diffusion, pore changes and internal microstructure changes in time sequence.
And (3) carrying out mechanical property test on the experimental coal rock body after grouting (after the experimental coal rock body is solidified) to obtain experimental test results (the test results comprise strength test), and comparing and analyzing the experimental test results with control test results to obtain grouting lifting effect data (the grouting lifting effect data comprise strength lifting, porosity reduction rate or water seepage rate reduction rate and the like). In some embodiments, after the coal-rock mass is solidified after grouting, a water permeability experiment can be performed by adopting a water pressure simulation system consisting of a water injection pump 10, a water pressure sensor 17, a pipeline B, a water injection pressure gauge 20 and the like, and CT scanning recording can be performed by the CT scanning device 2 (grouting solidification quality can be evaluated, for example, the situation of researching different slurry proportions is studied).
S40, setting different grouting pressures and slurry flow rates or/and adjusting slurry proportions by the grouting reinforcement control acquisition system, carrying out experiments according to the steps S10-S30, sequentially obtaining internal evolution data and grouting lifting effect data of the crushed simulated coal rock mass, and screening to obtain the optimal grouting amount, grouting pressure, grouting time or/and slurry proportions.
In some embodiments, the data processing center performs three-dimensional reconstruction based on the initial image data and the CT scanning data to obtain a three-dimensional coal-rock mass containing initial pores and internal microstructures, extracts the CT scanning data of time series and the image data of time series to pay attention to the characteristic changes of the pores and the internal microstructures, and visually expresses the internal evolution data of the broken simulation coal-rock mass in the three-dimensional coal-rock mass according to time series.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (10)
1. The utility model provides a colliery fault fracture zone slip casting consolidates simulation experiment device which characterized in that: the device comprises a frame base (5), an axial pressure loading device (4), a transparent cavity (14), a grouting pump (6) and a water injection pump (10), wherein the transparent cavity (14) is arranged at the top of the frame base (5), the axial pressure loading device (4) comprises an axial pressure loading shaft and an axial pressure loading plate (41) arranged at the end part of the axial pressure loading shaft (42), the axial pressure loading plate (41) is positioned at the top end inside the transparent cavity (14), a water separator (23) is arranged at the bottom end inside the transparent cavity (14), and a broken simulated coal rock body (3) positioned between the axial pressure loading plate (41) and the water separator (23) is arranged inside the transparent cavity (14); the side part of the transparent cavity (14) is provided with a grouting opening, the grouting pump (6) is communicated with the grouting opening in a sealing way through a pipeline A, and a slurry flowmeter (9) and a grouting pressure gauge (8) are arranged on the pipeline A; the water injection pump (10) is communicated with the water separator (23) in a sealing way through a pipeline B, and a water pressure sensor (17) is arranged at one end of the pipeline B, which is close to the water separator (23); the CT scanning device (2) is arranged outside the transparent cavity (14).
2. The simulation experiment device for grouting reinforcement of a fracture zone of a coal mine is characterized in that: the camera also comprises a pressure relief water tank (25), and a high-speed camera (15) is arranged outside the transparent cavity (14); the pressure relief water tank (25) is communicated with the pipeline A through a pipeline C, and a water valve B (22) is arranged on the pipeline C.
3. The simulation experiment device for grouting reinforcement of a fracture zone of a coal mine is characterized in that: the system also comprises a CT scanning data acquisition module (11) and a camera data acquisition module (16), wherein the CT scanning data acquisition module (11) is connected with the CT scanning device (2), and the camera data acquisition module (16) is connected with the high-speed camera (15); the bottom of the shaft pressure loading plate (41) is provided with a plurality of pressure sensors (18).
4. A simulation experiment device for grouting reinforcement of a fracture zone of a coal mine according to claim 3, wherein: and the pipeline B is provided with a water injection pressure gauge (20), a water valve A (21) and a liquid flowmeter (19).
5. The simulation experiment device for grouting reinforcement of a fracture zone of a coal mine is characterized in that: the system comprises a CT scanning data acquisition module (11), a camera data acquisition module (16), a shaft pressure loading control module (12), a grouting control and acquisition module, a water injection control and acquisition module and a data processing center, wherein the CT scanning data acquisition module (11) and the camera data acquisition module (16) are positioned in the grouting reinforcement control acquisition system, the shaft pressure loading control module (12) is respectively connected with a shaft pressure loading device (4) and a pressure sensor (18), and the shaft pressure loading control module (12) is used for controlling the shaft pressure loading device (4) to apply a main shaft pressure to a broken simulated coal rock mass (3) through a shaft pressure loading plate (41) according to set main shaft pressure and acquire main shaft pressure loading data monitored by the pressure sensor (18); the grouting control and acquisition module is respectively connected with the grouting pump (6), the slurry flowmeter (9) and the grouting pressure gauge (8), and is used for acquiring slurry flow data of the slurry flowmeter (9) and grouting pressure data of the grouting pressure gauge (8), and controlling grouting operation of the grouting pump (6); the water injection control and acquisition module is respectively connected with the water injection pump (10), the liquid flowmeter (19), the water injection pressure gauge (20) and the water pressure sensor (17), and is used for acquiring water injection flow data of the liquid flowmeter (19) and water pressure data of the water pressure sensor (17), and controlling water injection operation of the water injection pump (10); the CT scanning data acquisition module (11) is used for acquiring CT scanning data of the CT scanning device (2) on the crushed simulated coal rock mass (3), and the camera data acquisition module (16) is used for acquiring image data of the high-speed camera (15) on the crushed simulated coal rock mass (3); the data processing center is used for recording experimental parameters and internal evolution data of the crushed simulated coal rock mass under the experimental parameters, and the experimental parameters comprise spindle pressure, water pressure, slurry flow, grouting pressure and grouting time.
6. The simulation experiment device for grouting reinforcement of a fracture zone of a coal mine is characterized in that: the water valve A (21) and the water valve B (22) are electromagnetic valves, and the water injection control and acquisition module comprises a water pressure stabilizing control module which is respectively connected with the water pressure sensor (17), the water valve A (21) and the water valve B (22).
7. The simulation experiment device for grouting reinforcement of a fracture zone of a coal mine is characterized in that: the CT scanning device is characterized by further comprising a fixed frame (1) arranged at the top of the frame base (5), wherein the CT scanning device (2) and the axial pressure loading device (4) are fixed on the fixed frame (1); the water separator (23) is a water separation tank, the bottom of the water separation tank is communicated with the pipeline B in a sealing way, and a plurality of water separation holes communicated with the inner cavity of the water separation tank are uniformly distributed on the top plate of the water separation tank.
8. A method for grouting reinforcement simulation experiment device for a fault fracture zone of a coal mine by using the method for grouting reinforcement simulation experiment device for a fault fracture zone of a coal mine according to claim 5, which is characterized in that: the method comprises the following steps:
s1, sampling or simulating preparation is carried out according to a fault area of a mine research area to obtain a broken simulated coal rock mass (3), and stress data and water pressure data of the fault area of the mine research area are measured to obtain spindle pressure and water pressure corresponding to a simulation experiment; placing a broken simulated coal rock body (3) in a transparent cavity (14), wherein the broken simulated coal rock body (3) is positioned between an axial pressure loading plate (41) and a water separator (23), the end part of a pipeline A is communicated with a grouting port in a sealing manner, a pipeline B is communicated with the water separator (23) in a sealing manner, a CT scanning device (2) is enabled to completely cover the broken simulated coal rock body (3) for scanning, and a high-speed camera (15) is enabled to completely cover the broken simulated coal rock body (3) for shooting;
S2, an axial pressure loading control module (12) of the grouting reinforcement control acquisition system controls an axial pressure loading device (4) to drive an axial pressure loading plate (41) to apply main axial pressure to the crushed simulated coal rock mass (3), and a pressure sensor (18) monitors the applied main axial pressure and feeds the main axial pressure back to the axial pressure loading control module (12); the water injection control and acquisition module of the grouting reinforcement control acquisition system controls the water injection pump (10) to perform water injection operation, the water distributor (23) applies water pressure to the broken simulated coal rock mass (3) in a simulation mode, and the water pressure sensor (17) monitors the water pressure in the pipeline B and feeds the water pressure back to the water injection control and acquisition module; the axial pressure loading device (4) and the water injection pump (10) keep working and fine adjustment until the applied main axial pressure and water pressure are stable and reach the main axial pressure and water pressure corresponding to the simulation experiment;
s3, a grouting control and acquisition module of the grouting reinforcement control acquisition system controls a grouting pump (6) to perform grouting operation, and the grouting control and acquisition module acquires the slurry flow Q1 of a slurry flowmeter (9) and the grouting pressure F1 of a grouting pressure gauge (8); the CT scanning data acquisition module (11) acquires CT scanning data of the CT scanning device (2) on the crushed simulated coal rock mass (3) in time sequence, and the camera data acquisition module (16) acquires image data of the high-speed camera (15) on the crushed simulated coal rock mass (3) in time sequence; the data processing center records experimental parameters and internal evolution data of the crushed simulated coal rock mass under the experimental parameters, wherein the experimental parameters comprise spindle pressure, water pressure, slurry flow, grouting pressure and grouting time, and the internal evolution data of the crushed simulated coal rock mass comprise morphological changes, slurry diffusion, pore changes and internal microstructure changes in time sequence;
S4, setting different grouting pressures and slurry flow rates or/and adjusting slurry proportions by the grouting reinforcement control acquisition system, and carrying out experimental treatment on similar crushed simulated coal rock bodies (3) according to the steps S1-S3 to sequentially obtain internal evolution data of the crushed simulated coal rock bodies.
9. A method for grouting reinforcement simulation experiment device for a fault fracture zone of a coal mine by using the method for grouting reinforcement simulation experiment device for a fault fracture zone of a coal mine according to claim 5, which is characterized in that: the method comprises the following steps:
s10, sampling or simulating according to a fault area of a mine research area to obtain two crushed simulated coal and rock bodies (3), dividing the two crushed simulated coal and rock bodies (3) into experimental coal and rock bodies and reference coal and rock bodies, and performing mechanical property test on the reference coal and rock bodies to obtain a reference test result, wherein the mechanical property test comprises a coal and rock body strength test; measuring fault area stress data and water pressure data of a mine research area and obtaining spindle pressure and water pressure corresponding to a simulation experiment; placing an experimental coal rock body in a transparent cavity (14), wherein the experimental coal rock body is positioned between an axial pressure loading plate (41) and a water separator (23), the end part of a pipeline A is communicated with a grouting port in a sealing way, a pipeline B is communicated with the water separator (23) in a sealing way, a CT scanning device (2) is used for completely covering the experimental coal rock body for scanning, and a high-speed camera (15) is used for completely covering the experimental coal rock body for shooting;
S20, an axial pressure loading control module (12) of the grouting reinforcement control acquisition system controls an axial pressure loading device (4) to drive an axial pressure loading plate (41) to apply main axial pressure to experimental coal and rock mass, and a pressure sensor (18) monitors the applied main axial pressure and feeds the main axial pressure back to the axial pressure loading control module (12); the water injection control and acquisition module of the grouting reinforcement control acquisition system controls the water injection pump (10) to perform water injection operation, the water distributor (23) applies water pressure to experimental coal and rock mass simulation, and the water pressure sensor (17) monitors the water pressure in the pipeline B and feeds the water pressure back to the water injection control and acquisition module; the axial pressure loading device (4) and the water injection pump (10) keep working and fine adjustment until the applied main axial pressure and water pressure are stable and reach the main axial pressure and water pressure corresponding to the simulation experiment;
s30, a grouting control and acquisition module of the grouting reinforcement control acquisition system controls a grouting pump (6) to perform grouting operation, and the grouting control and acquisition module acquires the slurry flow Q1 of a slurry flowmeter (9) and the grouting pressure F1 of a grouting pressure gauge (8); the CT scanning data acquisition module (11) acquires CT scanning data of the CT scanning device (2) on the experimental coal and rock mass according to time sequence, and the camera data acquisition module (16) acquires image data of the high-speed camera (15) on the experimental coal and rock mass according to time sequence; the data processing center records experimental parameters and internal evolution data of the crushed simulated coal rock mass under the experimental parameters, wherein the experimental parameters comprise spindle pressure, water pressure, slurry flow, grouting pressure and grouting time, and the internal evolution data of the crushed simulated coal rock mass comprise morphological changes, slurry diffusion, pore changes and internal microstructure changes in time sequence;
Carrying out mechanical property test on the experimental coal rock mass after grouting to obtain an experimental test result, and comparing and analyzing the experimental test result with a control test result to obtain grouting lifting effect data;
s40, setting different grouting pressures and slurry flow rates or/and adjusting slurry proportions by the grouting reinforcement control acquisition system, carrying out experiments according to the steps S10-S30, sequentially obtaining internal evolution data and grouting lifting effect data of the crushed simulated coal rock mass, and screening to obtain the optimal grouting amount, grouting pressure, grouting time or/and slurry proportions.
10. A method according to claim 8 or 9, characterized in that: the data processing center performs three-dimensional reconstruction based on the initial image data and CT scanning data to obtain a three-dimensional coal-rock mass containing initial pores and internal microstructures, extracts the CT scanning data of time sequences and the image data of time sequences concerning pore and internal microstructure characteristic changes, and visually expresses the internal evolution data of the broken simulation coal-rock mass in the three-dimensional coal-rock mass according to the time sequences.
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Inventor after: Hou Dianchen Inventor after: Wu Maofeng Inventor after: Niu Bo Inventor after: Zhang Cun Inventor after: Liu Shiqi Inventor after: Shi Xutao Inventor after: An Hongjie Inventor after: Huan Hengheng Inventor after: Han Zhenxian Inventor after: Han Jiufang Inventor after: Zhao Kai Inventor after: Ding Rongfei Inventor after: Wang Zhiyuan Inventor after: Jin Zesen Inventor after: Guo Xiaoke Inventor after: Wang Zhiguang Inventor before: Hou Dianchen Inventor before: Wu Maofeng Inventor before: Niu Bo Inventor before: Zhang Cun Inventor before: Liu Shiqi Inventor before: Shi Xutao Inventor before: An Hongjie Inventor before: Yu Hengheng Inventor before: Han Zhenxian Inventor before: Han Jiufang Inventor before: Zhao Kai Inventor before: Ding Rongfei Inventor before: Wang Zhiyuan Inventor before: Jin Zesen Inventor before: Guo Xiaoke Inventor before: Wang Zhiguang |