CN107525541B - Low-permeability coal-rock mass splitting permeation coupling grouting test device and method - Google Patents
Low-permeability coal-rock mass splitting permeation coupling grouting test device and method Download PDFInfo
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- CN107525541B CN107525541B CN201710658405.8A CN201710658405A CN107525541B CN 107525541 B CN107525541 B CN 107525541B CN 201710658405 A CN201710658405 A CN 201710658405A CN 107525541 B CN107525541 B CN 107525541B
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- 239000011435 rock Substances 0.000 title claims abstract description 78
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- 238000010168 coupling process Methods 0.000 title claims abstract description 18
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 18
- 239000002002 slurry Substances 0.000 claims abstract description 78
- 239000003245 coal Substances 0.000 claims abstract description 59
- 239000004568 cement Substances 0.000 claims abstract description 22
- 238000007789 sealing Methods 0.000 claims abstract description 20
- 239000011440 grout Substances 0.000 claims description 34
- 238000007569 slipcasting Methods 0.000 claims description 31
- 230000008569 process Effects 0.000 claims description 16
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- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000005056 compaction Methods 0.000 description 4
- 208000010392 Bone Fractures Diseases 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
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Abstract
The invention discloses a low-permeability coal rock mass splitting permeation coupling grouting test device and method, the device comprises a grouting test inner cylinder and a grouting test outer cylinder sleeved outside the grouting test inner cylinder, the lower ends of the grouting test inner cylinder and the outer cylinder are connected with a base, the upper end of the grouting test inner cylinder is provided with a top sealing pressure head, the upper end of the grouting test outer cylinder is provided with an annular pressure head, an annular channel is formed among the grouting test inner cylinder, the grouting test outer cylinder, the base and the annular pressure head, the upper part of the grouting test outer cylinder is provided with a slurry overflow pipe and an exhaust pipe which are communicated with the annular channel, a coal rock mass sample is filled in the grouting test inner cylinder, the center of the coal rock mass sample is provided with a grouting flower pipe, the grouting flower pipe is provided with slurry overflow holes, the base is provided with grouting holes, the grouting holes are connected with the grouting flower pipe, an electric cement stirring station is communicated with a grouting pump, and the grouting pump is communicated with. The invention has the advantages of simple structure, easy manufacture, low cost, convenient operation, large size, full sealing and reliable use.
Description
Technical Field
The invention relates to a low-permeability coal rock splitting permeation coupling grouting test device and method, which are particularly suitable for a high-pressure splitting permeation coupling grouting test for simulating media such as low-permeability coal rock, soil samples, sand samples and the like in a laboratory.
Background
In the construction of mine and underground engineering through unfavorable geology or water-bearing stratum, grouting is an effective technique for reinforcing surrounding rock mass and blocking underground water, and it utilizes mechanical equipment and adopts reasonable grouting process to inject proper organic or inorganic grouting material into the engineering so as to attain the goal of filling, reinforcing and blocking water. For grouting materials, the organic grouting material has good groutability and rapid and efficient water plugging, but has high cost, serious pollution, low strengthening body strength, poor strengthening effect and less application in practical engineering, and is commonly used for special engineering such as grouting water plugging, quicksand strengthening and the like; the inorganic grouting material has rich sources, low price, high strength of the stone body, good impermeability, simple grouting process and convenient construction operation, and the cement-based grout is the most common grouting material at present; however, cement is a granular material, and has poor grouting effect on micro-fracture and low-permeability strata. Currently, most grouting theories and grouting tests mainly study the plane diffusion effect and the seepage diffusion rule of large-opening-degree fractured grout under the unconfined constraint condition of the grout, and cannot truly reflect the actual diffusion process of the grout in low-permeability media such as micro-fractured coal rock mass and the like under the constraint extrusion condition of ground stress and surrounding rock mass, while the simulated grouting test is an indispensable important method for studying the grouting diffusion and reinforcement mechanism of the media such as coal rock mass and the like. The laboratory grouting simulation test has the characteristics of intuition, economy, simplicity, convenience and feasibility, can reproduce the diffusion process of the slurry in media such as coal rock bodies, can ensure that the grouting technology is accurate and scientific, can better solve the problems existing in the grouting theory and actual engineering, reduces the blindness of construction only by experience and the grouting cost, and is a research means with wider application. Under the high-stress condition of deep resource exploitation, fractures with large opening degrees of media such as coal rock tend to close, and a large number of micro fractures (the diameter of pores or the opening degree of the fractures is less than 0.2mm) exist in surrounding rock mass, so that the injectability of the coal rock mass is reduced; in addition, for argillaceous cemented rock (mudstone, argillaceous sandstone and the like), the opening degree of internal fractures is small, the porosity is low, and the injectability is poor; in addition, the grouting material also contains medium such as quicksand, clay and the like, and has better compactness and poor grouting effect of cement-based grout. That is, under the influence of diagenetic conditions and stress levels, the opening degree of the cracks of the surrounding rock mass is small after some underground engineering is excavated, so that the free flow of the cement-based slurry in the microcracks is blocked, and the compaction grouting effect only by adopting the extrusion diffusion of the slurry is poor; when the grouting pressure reaches a certain critical pressure (splitting pressure), the opening degree of micro-cracks in media such as low-permeability coal rock mass and the like can be increased, so that the fluidity and the diffusion radius of the slurry are improved, and the aims of reinforcing, grouting and water plugging are fulfilled.
At present, because of the influence of factors such as test conditions, test objects and the like, the existing grouting test model equipment can only simulate compaction and permeation grouting to a certain extent, because the coal-injected rock mass is a mixture of small blocky structures or an integral coal rock mass containing more cracks and having larger crack opening, the internal cracks of the coal-injected rock mass develop and are loose in structure, the integral permeability is good, the grouting performance is strong, the free flow diffusion of grout is convenient, and the permeation diffusion of cement-based grout in the coal rock mass with developed cracks can be realized generally only by using smaller grouting pressure; in addition, the grouting device has the problems of too small size, insufficient sealing performance and the like, so that the slurry leakage phenomenon is common, and high-pressure fracturing grouting is difficult to realize. In actual mines and underground engineering, low-permeability coal rock masses with undeveloped cracks or small crack openings widely exist, and the cement-based grouting material cannot penetrate into the microcracks due to the small grouting pressure in the conventional permeation grouting process; therefore, the grouting pressure needs to be increased to crack the low-permeability coal rock mass within a certain range, a fracture network with a large opening degree (the pore diameter or the fracture opening degree is larger than 0.2mm) is formed in the coal rock mass, and the fluidity and the diffusion effect of the slurry are improved. How to judge whether the grouting pressure reaches the splitting pressure of the media such as low-permeability coal rock mass and the like only has a certain theoretical solution at present, but the theoretical solution of the splitting pressure is inconsistent with the actual engineering condition due to the influence of factors such as fracture parameters, distribution characteristics, ground stress and the like in the media such as the coal rock mass and the like. Therefore, the development of a high-pressure splitting-permeation coupling grouting test device for simulating low-permeability coal rock mass and other media with undeveloped cracks or small crack opening degree is necessary, and a test basis can be provided for analyzing the permeation flow and splitting diffusion rule of slurry in the microcracks and disclosing the splitting-permeation coupling grouting mechanism of the low-permeability coal rock mass.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to overcome the defects of the prior art, and provides a high-pressure splitting infiltration coupling grouting test device which is simple in structure, easy to manufacture, low in cost, convenient to operate, large in size, fully closed and reliable to use, aiming at low-permeability coal rock mass with undeveloped cracks or soil samples, sand samples and other media with small porosity (gaps).
In order to achieve the purpose, the invention adopts the following technical scheme: a low-permeability coal-rock mass splitting permeation coupling grouting test device comprises a base, a grouting pump, an electric cement mixing station, a grouting test inner cylinder, a grouting test outer cylinder, a grouting perforated pipe and a coal-rock mass sample; the lower end of the grouting test inner cylinder is connected with the base, the upper end of the grouting test inner cylinder is provided with a movable top sealing pressure head, the outer cylinder for the grouting test is sleeved outside the inner cylinder for the grouting test, the lower end of the outer cylinder for the grouting test is connected with the base, the upper end of the outer cylinder for the grouting test is provided with an annular pressure head, an annular channel is formed among the inner cylinder for the grouting test, the outer cylinder for the grouting test, the base and the annular pressure head, the upper part of the outer cylinder for the grouting test is provided with a slurry overflow pipe and an exhaust pipe, the slurry overflow pipe and the exhaust pipe are respectively communicated with the annular channel, the coal rock mass sample is filled in the inner cylinder for the grouting test, a grouting floral tube is arranged at the center of the coal rock mass sample, grout overflow holes are uniformly distributed on the grouting floral tube, a base grouting hole is arranged on the base, the base grouting hole is connected with the lower end of the grouting floral tube, the electric cement mixing station is communicated with an inlet of a grouting pump, and an outlet of the grouting pump is communicated with a base grouting hole through a high-pressure grouting hose.
Furthermore, a plurality of yielding sealing plugs are uniformly and symmetrically arranged in the annular channel.
Furthermore, a plurality of annular slurry gathering grooves are arranged on the inner wall of the inner cylinder of the grouting test at intervals, a slurry discharge exhaust hole is formed in the middle of each slurry gathering groove, and each slurry discharge exhaust hole is communicated with the annular channel.
Furthermore, a slurry servo control system is arranged at an outlet of the grouting pump, and a slurry flow, pressure and density monitoring system is arranged on the high-pressure grouting hose.
Further, a spring micro-opening type safety valve and a diaphragm type pressure gauge are arranged on the slurry overflow pipe; an exhaust control valve is arranged on the exhaust pipe; a grout container is arranged below the grout overflow pipe.
Further, the lower end of the inner cylinder in the grouting test is inserted into an annular notch in the base; the lower end of the outer cylinder of the grouting test is fixedly connected with the base through a high-strength bolt.
Furthermore, base slip casting hole includes slip casting hole one and slip casting hole two, and the central point that slip casting hole one is located the base puts, and during slip casting perforated pipe lower extreme inserted slip casting hole one, two one ends in slip casting hole communicate with slip casting hole one, and two other ends in slip casting hole extend to the base side and install the interface ring flange, and high-pressure slip casting hose links to each other with the interface ring flange.
A low-permeability coal rock mass splitting permeation coupling grouting test method adopting the test device comprises the following steps:
the method comprises the following steps: connecting a pressure testing machine with a top sealing pressure head, starting the pressure testing machine, applying preset axial pressure to the coal rock mass sample through the top sealing pressure head, discharging gas in a grouting test inner cylinder and an annular channel through an exhaust pipe in the process of applying the axial pressure, and providing annular constraint force to the coal rock mass sample through the grouting test inner cylinder, the grouting test outer cylinder and a yielding sealing plug;
step two: putting cement and water in a certain proportion into an electric cement mixing station for mixing, conveying the uniformly mixed grout into a first grouting hole and a second grouting hole of a base through a grouting pump and a high-pressure grouting hose, extruding and diffusing the grout sample to the coal rock mass sample through a grout overflow hole in a grouting perforated pipe, wherein the grouting pressure of the grouting pump is lower than the splitting pressure of the low-permeability coal rock mass until the grout flow in the high-pressure grouting hose is zero or the grout backflow phenomenon occurs;
step three: and gradually increasing the grouting pressure of the grouting pump to the splitting pressure of the low-permeability coal rock mass, and increasing the opening of the microcracks of the coal rock mass sample to enable the slurry to be continuously injected into the coal rock mass sample.
Furthermore, in the process of the third implementation step, gas of the coal rock sample and redundant slurry are continuously collected in the slurry collection groove and are discharged into the annular channel through the slurry discharge exhaust hole, the slurry in the annular channel is continuously accumulated and increased and fills the whole annular channel along with the improvement of the grouting pressure, when the difference value between the internal pressure of the annular channel and the external air pressure exceeds a set pressure value, the spring micro-opening safety valve is automatically opened, and the gas and the slurry in the annular channel are discharged into the slurry containing container through the slurry overflow pipe so as to ensure the continuous grouting.
Furthermore, in the process of implementing the second step and the third step, the flow, the pressure and the density of the slurry are dynamically monitored in real time through a slurry flow, pressure and density monitoring system, so that the easiness of the slurry and the effective control of the grouting pressure are ensured, and the fine control of the grouting process is realized.
Has the advantages that: the grouting test device can simulate and reproduce the whole process of large-size low-permeability complete coal-rock mass splitting permeation coupling grouting, has the function of developing compaction permeation grouting of media such as broken coal-rock mass and the like, can also be used for simulating the grouting diffusion rule of various media such as soil bodies, sand bodies, soil-rock mixtures and the like with different gradation and porosity under the conditions of compaction and splitting grouting, analyzing the grouting reinforcement effect and determining the critical grouting pressure required by the injected media when splitting is generated; and the reinforced coal rock mass and other media can be made into standard test pieces by coring, and the basic mechanical test and the mesoscopic mechanical test can be carried out. The device has the advantages of simple structure, easy manufacture, low cost, convenient operation and reliable use.
Drawings
FIG. 1 is a schematic structural view of a grouting test device according to the present invention;
FIG. 2 is a view taken along line A of FIG. 1;
FIG. 3 is a view taken along the line B in FIG. 1;
in the figure: the device comprises a base, 2 high-pressure grouting hoses, 3 a grout flow, pressure and density monitoring system, 4 a grout servo control system, 5 a grouting pump, 6 an electric cement stirring station, 7 an interface flange, 8 a grouting hole II, 9 a high-strength bolt, 10 a grout overflow pipe, 11 a spring micro-opening safety valve, 12 a diaphragm type pressure gauge, 13 an exhaust pipe, 14 an exhaust control valve, 15 a grout containing container, 16 a grouting test inner cylinder, 17 a grouting test outer cylinder, 18 an annular channel, 19 a top sealing pressure head, 20 a pressure relief sealing plug, 21 a grout gathering tank, 22 a grout exhaust hole, 23 a grouting pipe, 24 a grout overflow hole, 25 a grouting hole I, 26 a coal rock sample and 27 an annular pressure head.
The specific implementation mode is as follows:
the invention is further explained below with reference to the drawings.
As shown in fig. 1 to 3, the low-permeability coal-rock mass splitting permeation coupling grouting test device comprises a base 1, a grouting pump 5, an electric cement mixing station 6, a grouting test inner cylinder 16, a grouting test outer cylinder 17, a grouting perforated pipe 23, a coal-rock mass sample 26 and the like.
The lower end of the grouting test inner cylinder 16 is inserted into an annular notch on the base 1, and the upper end of the grouting test inner cylinder 16 is provided with a movable top sealing pressure head 19. The outer cylinder 17 of the grouting test is sleeved on the outer side of the inner cylinder 16 of the grouting test in a sleeved mode, the lower end of the outer cylinder 17 of the grouting test is fixedly connected with the base 1 through a high-strength bolt 9, an annular pressure head 27 is arranged at the upper end of the outer cylinder 17 of the grouting test, an annular channel 18 is formed among the inner cylinder 16 of the grouting test, the outer cylinder 17 of the grouting test, the base 1 and the annular pressure head 27, and a plurality of yielding sealing plugs 20 are uniformly and symmetrically arranged in the annular channel 18.
A plurality of annular slurry gathering grooves 21 are arranged on the inner wall of the inner cylinder 16 in the grouting test at intervals, a slurry discharge exhaust hole 22 is formed in the middle of each slurry gathering groove 21, and each slurry discharge exhaust hole 22 is communicated with the annular channel 18. The upper part of the grouting test outer cylinder 17 is provided with a slurry overflow pipe 10 and an exhaust pipe 13, and the slurry overflow pipe 10 and the exhaust pipe 13 are respectively communicated with an annular channel 18. The slurry overflow pipe 10 is provided with a spring micro-open type safety valve 11 and a diaphragm type pressure gauge 12. An exhaust control valve is provided in the exhaust pipe 13. A slurry container 15 is arranged below the slurry overflow pipe 10.
The coal rock mass sample 26 is filled in the grouting test inner cylinder 16, a grouting floral tube 23 is arranged at the center of the coal rock mass sample 26, and grout overflow holes 24 are uniformly distributed in the grouting floral tube 23.
Base slip casting hole has been seted up to base 1, and base slip casting hole includes slip casting hole one 25 and slip casting hole two 8, and slip casting hole one 25 is located base 1 central point and puts, and slip casting perforated pipe 23 lower extreme inserts slip casting hole one 25, and two 8 one ends in slip casting hole communicate with slip casting hole one 25, and the two 8 other ends in slip casting hole extend to base 1 side and install interface ring flange 7.
The electric cement mixing station 6 is communicated with an inlet of the grouting pump 5, an outlet of the grouting pump 5 is connected with one end of the high-pressure grouting hose 2, and the other end of the high-pressure grouting hose 2 is connected with an interface flange 7 at the other end of the second grouting hole 8. A slurry servo control system 4 is arranged at the outlet of the grouting pump 5, and a slurry flow, pressure and density monitoring system 3 is arranged on the high-pressure grouting hose 2.
In the embodiment, the base, the grouting test inner cylinder and the grouting test outer cylinder are all made of high-strength steel (with the specification of Q235-355). The diameter of the base is 800-900 mm, and the height of the base is 300-400 mm; the diameter of the inner cylinder in the grouting test is 500-700 mm, the wall thickness is 10-20 mm, and the height is 500-600 mm; the diameter of the outer cylinder in the grouting test is 800-900 mm, the wall thickness is 20-30 mm, the height is 500-600 mm, and the distance between the inner cylinder and the outer cylinder in the grouting test is 30-60 mm; the strength grade of the high-strength bolt is 8.8-10.9, and the diameter of the bolt hole is 20-28 mm; the annular notch width of base is 10 ~ 20mm, and the degree of depth is 100 ~ 200 mm. The diameter of the grouting hole of the base is 30-30 mm, and the total length is 400-450 mm. The diameter of the grouting perforated pipe is 6-8 mm, the wall thickness is 1-2 mm, and the length is 450-550 mm; the diameter of the pulp overflow holes is 3-5 mm, the distance is 10-20 mm, and the pulp overflow holes are uniformly arranged according to a quincunx shape; the slurry gathering grooves are distributed for 6-8 circles at equal intervals along the length direction of the grouting inner cylinder, the depth of each groove is 10-20 mm, the width of each groove is 20-30 mm, and the interval is 30-50 mm; the slurry discharge exhaust holes completely penetrate through the inner cylinder of the slurry injection test, the diameter is 8-10 mm, the distance is 40-50 mm, and the slurry discharge exhaust holes are arranged in the center of the middle of the slurry gathering groove.
The rated pressure of the externally connected spring micro-opening type safety valve can be divided into 3 grades, namely 0-20 MPa, 20-40 MPa and 40-60 MPa; the exhaust pipe and the slurry overflow pipe are seamless steel pipes, the diameter of each seamless steel pipe is 8-10 mm, the wall thickness of each seamless steel pipe is 2-3 mm, and the length of each seamless steel pipe is 15-20 mm; the rated pressure of the diaphragm pressure gauge can be classified into 3 grades, i.e. 0-20 MPa, 20-40 MPa, 40-60 MPa.
The diameter of the high-pressure grouting hose is 20-30 mm, and the wall thickness is 3-6 mm; the flow, pressure and density monitoring system consists of a flow sensor, a pressure sensor and a density sensor, wherein the measuring range of the flow sensor is 0-3L/min, the resolution is 0.001L/min, and the error is +/-0.5%; the measuring range of the pressure sensor is 20-30 MPa, the resolution is 0.01MPa, and the error is +/-0.5%; the measuring range of the density sensor is 0-3 g/cm3Resolution of 0.001g/cm3The error is. + -. 0.5%. The range of the slurry servo control valve system is 0-2L/min, the resolution is 0.001L/min, and the error is +/-0.5-1.0%; the grouting pump can provide 0-20 MPa and 20-40MPa, 40-60 MPa and other 3 levels of grouting pressure, and the capacity of the electric cement mixing plant is 30-50L; the above parameters can be adjusted properly according to the actual engineering situation.
The low-permeability coal rock mass splitting permeation coupling grouting test method adopting the test device comprises the following steps:
the method comprises the following steps: connecting a pressure testing machine with a top sealing pressure head 19, starting the pressure testing machine, applying preset axial pressure to the coal and rock mass sample 26 through the top sealing pressure head 19, discharging gas in a grouting test inner cylinder 16 and an annular channel 18 through an exhaust pipe 13 in the process of applying the axial pressure, and providing annular restraining force to the coal and rock mass sample 26 through the grouting test inner cylinder 16, a grouting test outer cylinder 17 and a pressure yielding sealing plug 20;
step two: cement and water in a certain proportion are put into an electric cement mixing station 6 to be mixed, the slurry after uniform mixing is conveyed into a first grouting hole 25 and a second grouting hole 8 of a base 1 through a grouting pump 5 and a high-pressure grouting hose 2, then the slurry is extruded and diffused to a coal rock sample 26 through a slurry overflow hole 24 in a grouting perforated pipe 23, the grouting pressure of the grouting pump 5 is lower than the splitting pressure of the low-permeability coal rock mass until the slurry flow in the high-pressure grouting hose is zero or the slurry backflow phenomenon occurs, and at this time, the coal rock sample 26 can be judged not to eat slurry basically;
step three: gradually increasing the grouting pressure of the grouting pump 5 to the splitting pressure of the low-permeability coal rock, increasing the opening degree of the microcracks of the coal rock sample 26, and continuously injecting grout into the coal rock sample 26, wherein in the process of the third implementation step, gas and redundant grout of the coal rock sample 26 are continuously collected in the grout collecting groove 21 and are discharged into the annular channel 18 through the grout discharge vent 22, along with the increase of the grouting pressure, the grout in the annular channel 18 is continuously accumulated and increased and is fully stored in the whole annular channel 18, so that the internal pressure of the annular channel 18 is continuously increased, when the difference value between the internal pressure of the channel 18 and the external air pressure exceeds a set pressure value, the spring micro-open safety valve 11 is automatically opened, and the gas and the grout in the annular channel 18 are discharged into the grout containing container 15 through the grout overflow pipe 10, so as to ensure the continuous grouting.
In the process of implementing the second step and the third step, the flow, the pressure and the density of the slurry are dynamically monitored in real time by the slurry flow, pressure and density monitoring system 3, so that the easiness of the slurry and the effective control of the grouting pressure are ensured, and the fine control of the grouting process is realized.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (5)
1. The utility model provides a low permeability coal rock mass splitting infiltration coupling slip casting test device which characterized in that: the device comprises a base (1), a grouting pump (5), an electric cement mixing station (6), a grouting test inner cylinder (16), a grouting test outer cylinder (17), a grouting perforated pipe (23) and a coal and rock sample (26); the lower end of the grouting test inner cylinder (16) is connected with the base (1), the upper end of the grouting test inner cylinder (16) is provided with a movable top sealing pressure head (19), the grouting test outer cylinder (17) is sleeved on the outer side of the grouting test inner cylinder (16), the lower end of the grouting test outer cylinder (17) is connected with the base (1), the upper end of the grouting test outer cylinder (17) is provided with an annular pressure head (27), an annular channel (18) is formed among the grouting test inner cylinder (16), the grouting test outer cylinder (17), the base (1) and the annular pressure head (27), the upper part of the grouting test outer cylinder (17) is provided with a slurry overflow pipe (10) and an exhaust pipe (13), the slurry overflow pipe (10) and the exhaust pipe (13) are respectively communicated with the annular channel (18), the coal rock body sample (26) is filled in the grouting test inner cylinder (16), and a grouting floral pipe (23) is arranged at the center of the coal rock body sample (26), the grouting pipe (23) is uniformly provided with overflow holes (24), the base (1) is provided with a base grouting hole, the base grouting hole is connected with the lower end of the grouting pipe (23), the electric cement mixing station (6) is communicated with the inlet of the grouting pump (5), and the outlet of the grouting pump (5) is communicated with the base grouting hole through a high-pressure grouting hose (2);
a plurality of yielding sealing plugs (20) are uniformly and symmetrically arranged in the annular channel (18);
a plurality of annular slurry gathering grooves (21) are arranged on the inner wall of the inner cylinder (16) of the grouting test at intervals, a slurry discharge exhaust hole (22) is formed in the middle of each slurry gathering groove (21), and each slurry discharge exhaust hole (22) is communicated with the annular channel (18);
a slurry servo control system (4) is arranged at the outlet of the grouting pump (5), and a slurry flow, pressure and density monitoring system (3) is arranged on the high-pressure grouting hose (2);
a spring micro-opening safety valve (11) and a diaphragm type pressure gauge (12) are arranged on the pulp overflow pipe (10); an exhaust control valve (14) is arranged on the exhaust pipe (13); a grout container (15) is arranged below the grout overflow pipe (10);
the diameter of an inner cylinder in a grouting test is 500 ~ 700mm, the wall thickness is 10 ~ 20mm, the height is 500 ~ 0600 mm, the diameter of an outer cylinder in the grouting test is 800 ~ 900mm, the wall thickness is 20 ~ 30mm, the height is 500 ~ 600mm, the distance between the inner cylinder and the outer cylinder in the grouting test is 30 ~ 60mm, a grouting pump can provide grouting pressures of 0 ~ 20MPa, 20 ~ 40MPa and 40 ~ 60MPa 3 grades, and the capacity of an electric cement mixing plant is 30 ~ 50L;
the lower end of the grouting test inner cylinder (16) is inserted into an annular notch on the base (1); the lower end of the grouting test outer cylinder (17) is fixedly connected with the base (1) through a high-strength bolt (9).
2. The low-permeability coal-rock body splitting permeation coupling grouting test device according to claim 1, characterized in that: the base slip casting hole includes slip casting hole one (25) and slip casting hole two (8), and slip casting hole one (25) are located the central point of base (1) and put, and slip casting floral tube (23) lower extreme inserts in slip casting hole one (25), and slip casting hole two (8) one end and slip casting hole one (25) intercommunication, and the slip casting hole two (8) other end extends to base (1) side and installs interface ring flange (7), and high pressure slip casting hose (2) link to each other with interface ring flange (7).
3. A low-permeability coal rock body splitting permeation coupling grouting test method adopting the test device of claim 2 is characterized by comprising the following steps:
the method comprises the following steps: connecting a pressure testing machine with a top sealing pressure head (19), starting the pressure testing machine, applying preset axial pressure to the coal and rock mass sample (26) through the top sealing pressure head (19), discharging gas in a grouting test inner cylinder (16) and an annular channel (18) through an exhaust pipe (13) in the process of applying the axial pressure, and providing annular constraint force to the coal and rock mass sample (26) through the grouting test inner cylinder (16), a grouting test outer cylinder (17) and a yielding sealing plug (20);
step two: cement and water in a certain proportion are put into an electric cement mixing station (6) to be mixed, the evenly mixed slurry is conveyed into a first grouting hole (25) and a second grouting hole (8) of a base (1) through a grouting pump (5) and a high-pressure grouting hose (2), then the slurry is extruded and diffused to a coal-rock mass sample (26) through a slurry overflow hole (24) in a grouting floral tube (23), and the grouting pressure of the grouting pump (5) is lower than the splitting pressure of a low-permeability coal-rock mass until the slurry flow in the high-pressure grouting hose (2) is zero or the slurry backflow phenomenon occurs;
step three: and gradually increasing the grouting pressure of the grouting pump (5) to the splitting pressure of the low-permeability coal rock mass, and increasing the opening degree of the microcracks of the coal rock mass sample (26) to continuously inject the grout into the coal rock mass sample (26).
4. The low-permeability coal-rock mass splitting permeation coupling grouting test method according to claim 3, characterized in that: in the third implementation process, gas and redundant slurry of the coal rock mass sample (26) are continuously collected in the slurry collection groove (21) and discharged into the annular channel (18) through the slurry discharge vent hole (22), the slurry in the annular channel (18) is continuously accumulated and increased and fills the whole annular channel (18) along with the increase of the grouting pressure, when the difference value of the internal pressure and the external air pressure of the annular channel (18) exceeds a set pressure value, the spring micro-opening type safety valve (11) is automatically opened, and the gas and the slurry in the annular channel (18) are discharged into the slurry containing container (15) through the slurry overflow pipe (10) so as to ensure the continuous grouting.
5. The low-permeability coal-rock mass splitting permeation coupling grouting test method according to claim 3, characterized in that: in the process of implementing the second step and the third step, the flow, the pressure and the density of the slurry are dynamically monitored in real time through the slurry flow, pressure and density monitoring system (3), so that the easiness of the slurry and the effective control of the grouting pressure are ensured, and the fine control of the grouting process is realized.
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| CN108919348B (en) * | 2018-09-19 | 2023-06-27 | 东北大学 | Intelligent grouting measurement and control system for fractured rock mass and implementation method |
| CN109211754B (en) * | 2018-09-29 | 2023-10-31 | 中国矿业大学 | Coal rock permeability measuring device and method |
| CN109752228B (en) * | 2019-01-22 | 2024-03-01 | 北京交通大学 | Sample preparation device and method for simulating composite stratum and reserving grouting holes |
| CN110044714A (en) * | 2019-05-14 | 2019-07-23 | 西安科技大学 | A kind of coal petrography analog material slip casting splitting three-dimensional simulation pilot system |
| CN110261202A (en) * | 2019-07-25 | 2019-09-20 | 泉州装备制造研究所 | A kind of grouting sample preparation device |
| CN114397238A (en) * | 2022-01-24 | 2022-04-26 | 中国矿业大学 | Coal-rock mass three-dimensional visual grouting test device and use method |
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