CN107525541A - A kind of hypotonicity coal and rock splitting infiltration coupling grouting experimental rig and method - Google Patents

Abstract

The invention discloses a low-permeability coal rock mass splitting penetration coupling grouting test device and method. The lower ends of the inner and outer cylinders for the grouting test are connected to the base, the upper end of the inner cylinder for the grouting test is provided with a top sealing pressure head, the upper end of the outer cylinder for the grouting test is provided with a ring pressure head, the inner and outer cylinders, the base and the ring pressure head for the grouting test An annular channel is formed between them. The upper part of the outer cylinder of the grouting test is provided with a slurry overflow pipe and an exhaust pipe connected to the annular channel. The coal rock sample is filled in the inner cylinder of the grouting test. The flower tube, the grouting flower tube is equipped with a grouting hole, the base is provided with a grouting hole, the grouting hole is connected to the grouting flower tube, the electric cement mixing station is connected to the grouting pump, and the grouting pump is connected to the grouting pump through a high-pressure grouting hose. The grouting holes are connected. The invention has the advantages of simple structure, easy manufacture, low cost, convenient operation, large size and full closure, and reliable use.

Description

A low-permeability coal-rock mass splitting seepage coupled grouting test device and method

technical field

The invention relates to a low-permeability coal rock mass splitting penetration coupling grouting test device and method, especially suitable for laboratory simulation of low-permeability coal rock mass or soil samples, sand samples and other media high-pressure splitting penetration coupling grouting test.

Background technique

In the construction of mines and underground engineering through unfavorable geology or water-bearing strata, grouting is an effective technology to strengthen the surrounding rock mass and block groundwater. It uses mechanical equipment and adopts a reasonable grouting process to inject suitable organic or inorganic It is grouting material injected into the project to achieve the purpose of filling, reinforcement and water blocking. For grouting materials, organic grouting materials have better injectability and fast and efficient water shutoff, but they are expensive, seriously polluted, have low reinforcement strength, and poor reinforcement effect, so they are rarely used in actual engineering. Special projects such as slurry water blocking and quicksand reinforcement; inorganic grouting materials are rich in sources, low in price, high in stone body strength, good in impermeability, simple in grouting process, and convenient in construction and operation. Cement-based grout is currently the most commonly used grouting material. However, cement is a granular material, and the grouting effect on micro-cracks and low-permeability formations is poor. At present, most of the grouting theories and grouting tests mainly study the planar diffusion effect of grout under the condition of unconfined constraints and the law of seepage and diffusion of grout in large-opening fissures, which cannot truly reflect the in-situ stress and the confinement and extrusion of surrounding rock mass. The actual diffusion process in low-permeability media such as micro-cracked coal and rock mass, and the simulated grouting test is an indispensable and important method to study the grouting diffusion and reinforcement mechanism of coal and rock mass and other media. This is because the laboratory grouting simulation test is intuitive, economical, simple, and feasible, and can reproduce the diffusion process of grout in coal and rock media, which can make the grouting technology more accurate and scientific, and can better solve the problem. It is a widely used research method to reduce the blindness and grouting cost of grouting theory and actual engineering. Under the high-stress conditions of deep resource mining, the cracks with large openings in the coal and rock mass tend to close, and there are a large number of tiny cracks (pore diameter or crack opening less than 0.2mm) in the surrounding rock mass, making the coal and rock mass Injectability is reduced; in addition, for argillaceous cemented rocks (mudstone, argillaceous sandstone, etc.), the internal fracture opening is small, porosity is low, and injectability is poor; in addition, quicksand, clay And other media, its compactness is better, and the grouting effect of cement-based grout is poor. That is to say, due to the influence of diagenetic conditions and stress levels, the opening of cracks in the surrounding rock mass after excavation of some underground projects is small, which causes the free flow of cement-based grout in the micro-cracks to be hindered. The effect of compaction grouting is poor; this requires continuously increasing the grouting pressure. When the grouting pressure reaches a certain critical pressure (split pressure), the opening of micro-cracks in low-permeability coal rock mass and other media can be reduced. In order to increase the fluidity and diffusion radius of the grout, it can achieve the purpose of reinforcement and grouting water blocking.

At present, due to the influence of factors such as test conditions and test objects, the existing grouting test model equipment can only simulate compaction seepage grouting to a certain extent, because the rock mass to be injected with coal is a mixture of small block structures Or a complete coal and rock mass with many cracks and large crack openings, resulting in the development of internal cracks, loose structure, good overall permeability and strong injectability, which is convenient for the free flow and diffusion of slurry. Generally, only a small injection is required. The permeation and diffusion of cement-based grout in the coal and rock mass with relatively well-developed fractures can be achieved by using only the grout pressure; in addition, due to the problems of too small size of the grouting device and insufficient sealing, the phenomenon of grout running out is common, and it is difficult to realize high-pressure splitting grouting. pulp. However, in actual mines and underground engineering, there are widely low-permeability coal and rock masses with no cracks or small crack openings. Due to the small grouting pressure in the conventional infiltration grouting process, the cement-based grouting material cannot penetrate into the Micro-cracks; this requires increasing the grouting pressure to split the low-permeability coal and rock mass within a certain range, and form a crack network with a large opening in the coal and rock mass (pore diameter or crack opening is greater than 0.2mm) , Improve the fluidity and diffusion effect of the slurry. How to judge whether the grouting pressure has reached the splitting pressure of low-permeability coal-rock mass and other media, there is only a certain theoretical answer at present, but it is affected by factors such as fracture parameters, distribution characteristics and in-situ stress in coal-rock mass and other media, resulting in Theoretical solution of splitting pressure is inconsistent with actual engineering situation. Therefore, it is necessary to develop a high-pressure splitting-permeation coupling grouting test device for simulating low-permeability coal and rock mass with no cracks or small crack openings. Diffusion law, as well as revealing the splitting-permeation coupling grouting mechanism of low-permeability coal and rock mass provide an experimental basis.

Contents of the invention

Purpose of the invention: the purpose of the invention is to overcome the deficiencies of the prior art, that is, to provide a simple structure, low-permeability coal rock mass or soil samples with less porosity (void) ratio, sand samples and other media that are not developed in cracks. Easy, low cost, convenient operation, large size fully enclosed, reliable high pressure splitting penetration coupling grouting test device.

In order to achieve the above object, the present invention adopts the following technical scheme: a low-permeability coal rock mass splitting penetration coupling grouting test device, including a base, a grouting pump, an electric cement mixing station, a grouting test inner cylinder, a grouting Grouting test outer cylinder, grouting flower tube, coal and rock mass sample; the lower end of the grouting test inner cylinder is connected with the base, and the upper end of the grouting test inner cylinder is provided with a movable top sealing pressure head, and the grouting test inner cylinder is provided with a movable top sealing pressure head. The test outer cylinder is ring-sleeved on the outside of the grouting test inner cylinder, the lower end of the grouting test outer cylinder is connected to the base, the upper end of the grouting test outer cylinder is provided with a ring pressure head, the grouting test inner cylinder, the grouting test outer cylinder, An annular channel is formed between the base and the annular pressure head. The upper part of the outer cylinder of the grouting test is provided with a slurry overflow pipe and an exhaust pipe. The overflow pipe and the exhaust pipe are respectively connected with the annular channel. Inside the inner cylinder of the grouting test, a grouting flower tube is arranged in the center of the coal and rock mass sample, and the grouting flower tube is evenly distributed with grouting holes, and the base is provided with a base grouting hole, and the base grouting hole and the grouting The lower ends of the flower tubes are connected, the electric cement mixing station is connected with the inlet of the grouting pump, and the outlet of the grouting pump is connected with the grouting hole of the base through a high-pressure grouting hose.

Further, a plurality of compression sealing plugs are evenly and symmetrically arranged in the annular channel.

Further, the inner wall of the inner cylinder of the grouting test is provided with several annular slurry collecting tanks at intervals, and the middle part of the slurry collecting tank is provided with a slurry discharge vent hole, and the slurry discharge vent hole communicates with the annular channel.

Further, a grout servo control system is set at the outlet of the grouting pump, and a grout flow, pressure and density monitoring system is set on the high-pressure grouting hose.

Further, a spring micro-opening safety valve and a diaphragm pressure gauge are arranged on the slurry overflow pipe; an exhaust control valve is arranged on the exhaust pipe; a slurry container is arranged below the slurry overflow pipe.

Further, the lower end of the inner cylinder for grouting test is inserted into the annular notch on the base; the lower end of the outer cylinder for grouting test is fixedly connected with the base by high-strength bolts.

Further, the base grouting hole includes a grouting hole 1 and a grouting hole 2, the grouting hole 1 is located at the center of the base, the lower end of the grouting flower tube is inserted into the grouting hole 1, and the end of the grouting hole 2 is connected to the grouting hole 2. The first grouting hole is connected, the other end of the second grouting hole extends to the side of the base and is equipped with an interface flange, and the high-pressure grouting hose is connected with the interface flange.

A low-permeability coal rock mass splitting penetration coupling grouting test method using the above-mentioned test device, the test method includes the following steps:

Step 1: Connect the pressure testing machine to the top sealing pressure head, start the pressure testing machine, and apply a predetermined axial pressure to the coal rock mass sample through the top sealing pressure head. The gas in the test inner cylinder and the annular channel is discharged, and the coal and rock mass sample is provided with a circumferential constraint force through the grouting test inner cylinder, the grouting test outer cylinder and the pressure sealing plug;

Step 2: Put a certain proportion of cement and water into the electric cement mixing station for mixing, and the evenly mixed slurry is transported to the grouting hole 1 and grouting hole 2 of the base through the grouting pump and high-pressure grouting hose In the process, the grouting hole in the grouting flower tube is squeezed and diffused to the sample of the coal and rock mass. The grouting pressure of the grouting pump is lower than the splitting pressure of the low-permeability coal and rock mass, until the inside of the high-pressure grouting hose The slurry flow rate is zero or the slurry backflow occurs;

Step 3: Gradually increase the grouting pressure of the grouting pump to the splitting pressure of the low-permeability coal-rock mass, increase the opening of the micro-cracks of the coal-rock mass sample, and continue to inject the grout into the coal-rock mass sample middle.

Further, in the process of implementing step three, the gas and excess slurry of the coal and rock mass sample are continuously collected in the slurry accumulation tank, and are discharged into the annular channel through the slurry discharge vent hole, and as the grouting pressure increases Increase, the slurry in the annular channel will continue to accumulate and increase and fill the entire annular channel. When the difference between the internal pressure of the annular channel and the external air pressure exceeds the set pressure value, the spring micro-opening safety valve will automatically open, and the slurry in the annular channel will be discharged through the overflow pipe. The gas and slurry are discharged into the slurry container to ensure continuous grouting.

Further, in the process of implementing steps two and three, the flow, pressure and density of the slurry are dynamically monitored in real time through the monitoring system of the flow, pressure and density of the slurry, so as to ensure the workability of the slurry and the effective control of the grouting pressure, and realize the Fine control of the grouting process.

Beneficial effects: the grouting test device of the present invention can simulate and reproduce the whole process of splitting and seepage coupled grouting of large-scale and low-permeability complete coal and rock mass, and has the function of compacting and seeping grouting for media such as broken coal and rock mass. It can be used to simulate the grouting diffusion law of various media such as soil, sand, and soil-rock mixtures with different gradations and pore (void) ratios under the conditions of compaction and split grouting, analyze the grouting reinforcement effect and determine the grouting effect. The critical grouting pressure required for the injection medium to produce splitting; and the reinforced coal rock mass and other media can be made into standard test pieces by coring, and basic mechanical tests and mesomechanical tests can be carried out. The device has the advantages of simple structure, easy manufacture, low cost, convenient operation and reliable use.

Description of drawings

Fig. 1 is the structural representation of grouting test device of the present invention;

Fig. 2 is a view from direction A in Fig. 1;

Fig. 3 is a view from direction B in Fig. 1;

In the figure: 1—base, 2—high pressure grouting hose, 3—slurry flow, pressure and density monitoring system, 4—slurry servo control system, 5—grouting pump, 6—electric cement mixing station, 7—interface method Blue plate, 8—grouting hole 2, 9—high strength bolt, 10—slurry overflow pipe, 11—spring micro-opening safety valve, 12—diaphragm pressure gauge, 13—exhaust pipe, 14—exhaust control valve, 15—slurry container, 16—inner cylinder for grouting test, 17—outer cylinder for grouting test, 18—annular channel, 19—top sealing pressure head, 20—pressure sealing plug, 21—slurry accumulation tank, 22—row Grout vent hole, 23—grouting flower pipe, 24—grout overflow hole, 25—grouting hole one, 26—coal rock mass sample, 27—annular pressure head.

detailed description:

The present invention will be further explained below in conjunction with the accompanying drawings.

As shown in Figures 1 to 3, a low-permeability coal rock mass splitting penetration coupling grouting test device of the present invention includes a base 1, a grouting pump 5, an electric cement mixing station 6, a grouting test inner cylinder 16, Grouting test outer cylinder 17, grouting flower tube 23, coal and rock mass sample 26, etc.

The lower end of the grouting test inner cylinder 16 is inserted in the 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 ring-sleeved on the outside of the inner cylinder 16 of the grouting test, the lower end of the outer cylinder 17 of the grouting test is fixedly connected with the base 1 through high-strength bolts 9, and the upper end of the outer cylinder 17 of the grouting test is provided with an annular pressure head 27 An annular channel 18 is formed between the grouting test inner cylinder 16 , the grouting test outer cylinder 17 , the base 1 and the annular pressure head 27 , and a plurality of compression sealing plugs 20 are evenly and symmetrically arranged in the annular channel 18 .

The inner wall of the grouting test inner cylinder 16 is provided with several annular slurry collecting tanks 21 at intervals. The top of the grouting test outer cylinder 17 is provided with a grout overflow pipe 10 and an exhaust pipe 13, and the grout overflow pipe 10 and the exhaust pipe 13 communicate with the annular passage 18 respectively. A spring micro-opening safety valve 11 and a diaphragm pressure gauge 12 are arranged on the overflow pipe 10 . An exhaust control valve is arranged on the exhaust pipe 13 . A slurry container 15 is arranged below the overflow pipe 10 .

The coal and rock mass sample 26 is filled in the inner cylinder 16 of the grouting test, and the grouting flower tube 23 is arranged in the center of the coal and rock mass sample 26, and the grouting flower tube 23 is evenly distributed with grout overflow holes 24.

The base 1 is provided with a base grouting hole, and the base grouting hole includes a grouting hole 1 25 and a grouting hole 2 8, the grouting hole 1 25 is located at the center of the base 1, and the lower end of the grouting floral tube 23 is inserted into the grouting hole 1 25 Among them, one end of the grouting hole 2 8 communicates with the grouting hole 1 25 , and the other end of the grouting hole 2 8 extends to the side of the base 1 and is equipped with an interface flange 7 .

The electric cement mixing station 6 is connected to the inlet of the grouting pump 5, the outlet of the grouting pump 5 is connected to one end of the high-pressure grouting hose 2, and the other end of the high-pressure grouting hose 2 is connected to the other end of the grouting hole 2 8 The flanges 7 are connected. A grout servo control system 4 is set at the outlet of the grouting pump 5 , and a grout flow, pressure and density monitoring system 3 is set on the high-pressure grouting hose 2 .

In this embodiment, the base, the inner cylinder for the grouting test and the outer cylinder for the grouting test are all made of high-strength steel (the specification is Q235-355). The diameter of the base is 800-900mm, the height is 300-400mm; the diameter of the inner cylinder of the grouting test is 500-700mm, the wall thickness is 10-20mm, and the height is 500-600mm; the diameter of the outer cylinder of the grouting test is 800-900mm, the wall thickness 20-30mm, height 500-600mm, distance between inner and outer cylinders in grouting test 30-60mm; high-strength bolt strength grade 8.8-10.9, bolt hole diameter 20-28mm; base ring notch width 10 ～20mm, the depth is 100～200mm. 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 flower tube is 6-8mm, the wall thickness is 1-2mm, and the length is 450-550mm; the diameter of the overflow holes is 3-5mm, and the spacing is 10-20mm, and the overflow holes are evenly arranged according to the plum blossom pattern; the slurry accumulation tank Arrange 6 to 8 circles at equal intervals along the length of the grouting inner cylinder, the slot depth is 10 to 20 mm, the slot width is 20 to 30 mm, and the spacing is 30 to 50 mm; the grout exhaust holes completely penetrate the grouting test The inner cylinder has a diameter of 8-10mm and a spacing of 40-50mm. The slurry discharge vent is arranged in the center of the middle of the slurry collection tank.

The rated pressure of the external spring micro-opening safety valve can be divided into 3 levels, namely 0-20MPa, 20-40MPa, 40-60MPa; the exhaust pipe and overflow pipe are made of seamless steel pipes, with a diameter of 8-10mm and a wall thickness of 2 ~ 3mm, the length is 15 ~ 20mm; the rated pressure of the diaphragm pressure gauge can also be divided into three levels, namely 0 ~ 20MPa, 20 ~ 40MPa, 40 ~ 60MPa.

The diameter of the high-pressure grouting hose is 20-30mm, and the wall thickness is 3-6mm; the flow, pressure and density monitoring system is composed of a flow sensor, a pressure sensor, and a density sensor. The range of the flow sensor is 0-3L/min, and the resolution is 0.001L/min, the error is ±0.5%; the range of the pressure sensor is 20-30MPa, the resolution is 0.01MPa, the error is ±0.5%; the range of the density sensor is 0-3g/cm ³ , the resolution is 0.001g/ cm ³ , the error is ±0.5%. The measuring 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 3 levels of 0-20MPa, 20-40MPa, 40-60MPa The grouting pressure, the capacity of the electric cement mixing plant is 30-50L; the above parameters can be adjusted appropriately according to the actual engineering situation.

The low-permeability coal-rock mass splitting penetration coupling grouting test method using the above-mentioned test device, the test method includes the following steps:

Step 1: Connect the pressure testing machine to the top sealing head 19, start the pressure testing machine, apply a predetermined axial pressure to the coal and rock mass sample 26 through the top sealing head 19, and pass through the exhaust pipe during the process of applying the axial pressure. 13 Discharge the gas in the inner cylinder 16 and the annular channel 18 of the grouting test, and provide a circumferential constraint force on the coal rock mass sample 26 through the inner cylinder 16 of the grouting test, the outer cylinder 17 of the grouting test and the sealing plug 20;

Step 2: put a certain proportion of cement and water into the electric cement mixing station 6 for mixing, and the uniformly mixed slurry is delivered to the grouting hole 125 of the base 1 through the grouting pump 5 and the high-pressure grouting hose 2 and grouting hole 2 8, and then squeeze and diffuse to the coal rock sample 26 through the overflow hole 24 in the grouting flower tube 23, and the grouting pressure of the grouting pump 5 is lower than that of the low-permeability coal rock mass. Crack pressure until the slurry flow rate inside the high-pressure grouting hose is zero or the slurry backflow phenomenon occurs. At this time, it can be judged that the coal rock mass sample 26 basically does not eat slurry;

Step 3: Gradually increase the grouting pressure of the grouting pump 5 to the splitting pressure of the low-permeability coal-rock mass, increase the opening of the micro-cracks of the coal-rock mass sample 26, and continue to inject the grout into the coal-rock mass In sample 26, in the process of implementing step 3, the gas and excess slurry of the coal-rock sample 26 are continuously collected in the slurry accumulation tank 21, and discharged into the annular channel 18 through the slurry discharge vent 22, As the grouting pressure increases, the grout in the annular channel 18 continues to accumulate and fill the entire annular channel 18, so that the internal pressure of the annular channel 18 continues to increase. When the difference between the internal pressure of the channel 18 and the external air pressure exceeds the set pressure value , The spring micro-opening safety valve 11 is automatically opened, and the gas and slurry in the annular passage 18 are discharged into the slurry container 15 through the overflow pipe 10, so as to ensure continuous grouting.

In the process of implementing steps 2 and 3, the flow, pressure and density of the grout are monitored dynamically in real time through the grout flow, pressure and density monitoring system 3, so as to ensure the workability of the grout and the effective control of the grouting pressure, and realize the control of grouting Fine control of the process.

The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.

Claims (10)

1. A kind of 1. hypotonicity coal and rock splitting infiltration coupling grouting experimental rig, it is characterised in that：Including base (1), slip casting Pump (5), electronic cement stirring station (6), grouting test inner casing (16), grouting test outer shell (17), grouting tube (23), coal and rock Sample (26)；The lower end of the grouting test inner casing (16) is connected with base (1), and the upper end of grouting test inner casing (16) is provided with can The top sealing pressure head (19) of activity, the grouting test outer shell (17) are located on the outside of grouting test inner casing (16), slip casting The lower end of experiment outer shell (17) is connected with base (1), and the upper end of grouting test outer shell (17) is provided with annular pressure head (27), slip casting examination Test formation circular passage (18) between inner casing (16), grouting test outer shell (17), base (1) and annular pressure head (27), slip casting examination The top for testing outer shell (17) is provided with overflow slurry pipe (10) and blast pipe (13), and excessive slurry pipe (10) and blast pipe (13) lead to annular respectively Road (18) connects, and the coal and rock sample (26) is filled in grouting test inner casing (16) inside, in coal and rock sample (26) The heart sets grouting tube (23), is evenly equipped with extravasating hole (24) on grouting tube (23), the base (1) offers base slip casting Hole, base injected hole are connected with grouting tube (23) lower end, and the electronic cement stirring station (6) and the entrance of grouting pump (5) connect Logical, the outlet of grouting pump (5) is connected by high-pressure slip-casting flexible pipe (2) with base injected hole.
2. 2. a kind of hypotonicity coal and rock splitting infiltration coupling grouting experimental rig according to claim 1, its feature exist In：Multiple densification blockings (20) that allow symmetrically are arranged in the circular passage (18).
3. 3. a kind of hypotonicity coal and rock splitting infiltration coupling grouting experimental rig according to claim 1 or 2, its feature It is：The inwall of the grouting test inner casing (16) is arranged at intervals with some annular slurries gathered troughs (21), slurries gathered trough (21) plasma discharge steam vent (22) is offered in the middle part of, plasma discharge steam vent (22) connects with circular passage (18).
4. 4. a kind of hypotonicity coal and rock splitting infiltration coupling grouting experimental rig according to claim 3, its feature exist In：The outlet of the grouting pump (5) sets slurries servo-control system (4), and slurry stream is set on the high-pressure slip-casting flexible pipe (2) Amount, pressure and measuring density system (3).
5. 5. a kind of hypotonicity coal and rock splitting infiltration coupling grouting experimental rig according to claim 4, its feature exist In：Spring micro-open type safety valve (11) and diaphragm pressure gage (12) are set on the excessive slurry pipe (10)；The blast pipe (13) Upper setting gas exhausting valve (14)；The lower section of the excessive slurry pipe (10) sets slurries container containing (15).
6. 6. a kind of hypotonicity coal and rock splitting infiltration coupling grouting experimental rig according to claim 5, its feature exist In：In annular notches on the lower end inserted base (1) of the grouting test inner casing (16)；The grouting test outer shell (17) Lower end is fixedly connected with base (1) by high-strength bolt (9).
7. 7. a kind of hypotonicity coal and rock splitting infiltration coupling grouting experimental rig according to claim 6, its feature exist In：The base injected hole includes injected hole one (25) and injected hole two (8), and injected hole one (25) is located at the center of base (1) Position, grouting tube (23) lower end are inserted in injected hole one (25), and injected hole two (8) one end connects with injected hole one (25), note Slurry hole two (8) other end extends to base (1) side and is provided with flange disk (7), high-pressure slip-casting flexible pipe (2) and interface method Blue disk (7) is connected.
8. 8. a kind of hypotonicity coal and rock splitting infiltration coupling grouting test method using experimental rig described in claim 7, Characterized in that, the test method comprises the following steps：

   Step 1：Pressure testing machine is connected with top sealing pressure head (19), starts pressure testing machine, pressure head is sealed by top (19) predetermined shaft pressure is applied to coal and rock sample (26), during axle pressure is applied, by blast pipe (13) by grouting test Gas discharge in inner casing (16) and circular passage (18), by grouting test inner casing (16), grouting test outer shell (17) and allows Densification blocking (20) provides hoop constraint power to coal and rock sample (26)；

   Step 2：A certain proportion of cement and water are put into electronic cement stirring station (6) and mixed, it is uniformly mixed Slurries are transported to the injected hole one (25) and injected hole of the base of base (1) by grouting pump (5), high-pressure slip-casting flexible pipe (2) In two (8), then extruded and spread to coal and rock sample (26) by the extravasating hole (24) in grouting tube (23), grouting pump (5) Grouting pressure is less than the cleavage fracture stress of hypotonicity coal and rock, until the internal slurry flow of high-pressure slip-casting flexible pipe (2) be zero or There is slurry reflux phenomenon；

   Step 3：The grouting pressure of grouting pump (5) is stepped up to the cleavage fracture stress of hypotonicity coal and rock, coal and rock is tried The aperture increase of the microfissure of sample (26), makes slurries continue to be injected into coal and rock sample (26).
9. A kind of 9. hypotonicity coal and rock splitting infiltration coupling grouting test method according to claim 8, it is characterised in that： During implementation steps three, slurries gathered trough is constantly come together in by the gas of coal and rock sample (26) and unnecessary slurries (21) in, and it is discharged to by plasma discharge steam vent (22) in circular passage (18), with the raising of grouting pressure, circular passage (18) The constantly accumulation of middle slurries increases and is filled with whole circular passage (18), when circular passage (18) internal pressure and external air pressure When difference exceedes setup pressure value, spring micro-open type safety valve (11) is automatically opened up, and (10) are managed by circular passage by the slurry that overflows (18) gas and slurries in are discharged in slurries container containing (15), to ensure the lasting progress of slip casting.
10. 10. a kind of hypotonicity coal and rock splitting infiltration coupling grouting test method, its feature exist according to claim 8 In：During implementation steps two and step 3, by slurry flow, pressure and measuring density system (3), dynamic is supervised in real time Flow, pressure and the density of slurries are surveyed, so as to ensure the easy property of slurries and effective control of grouting pressure, is realized to slip casting process Precise control.