CN110308246B - Outburst elimination technology for water injection of outburst coal seam and outburst elimination effect test method - Google Patents
Outburst elimination technology for water injection of outburst coal seam and outburst elimination effect test method Download PDFInfo
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- CN110308246B CN110308246B CN201910590245.7A CN201910590245A CN110308246B CN 110308246 B CN110308246 B CN 110308246B CN 201910590245 A CN201910590245 A CN 201910590245A CN 110308246 B CN110308246 B CN 110308246B
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- outburst
- water injection
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- 239000011901 water Substances 0.000 title claims abstract description 148
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound 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- 238000002347 injection Methods 0.000 title claims abstract description 123
- 239000007924 injections Substances 0.000 title claims abstract description 123
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
Abstract
Description
Technical Field
The invention relates to a outburst elimination technology for water injection of a outburst coal seam and an outburst elimination effect test method, in particular to the outburst elimination technology for water injection of the outburst coal seam and the outburst elimination effect test method which are suitable for underground coal mine tests.
Background
Coal and gas outburst (outburst for short) is a severe dynamic process which causes coal mine underground gas-containing coal rock to move from a coal rock layer to an excavation space rapidly in a crushed shape (completed within a few seconds to a few minutes) and is accompanied with a large amount of gas to be sprayed out, and the safety production of a mine is seriously threatened. Because the danger of carrying out all-round real-time tracking research on the outburst process of the coal and the gas on site is too large, researchers mostly search a coal and gas outburst mechanism by researching corresponding test devices and relying on a laboratory simulation means.
On one hand, the coal seam can be softened by injecting water into the outburst coal seam, and the strength of the coal body is reduced; meanwhile, the sealing of the gas inside the substrate block can be realized, so that the gas is more difficult to be converted into a free state from an adsorption state, the residual quantity of the gas in the coal bed is increased, and the gas emission quantity is reduced. Therefore, the water injection to the outburst coal seam can effectively reduce the outburst risk theoretically, and is an effective outburst elimination technology, but indoor verification is lacked.
Disclosure of Invention
Aiming at the defects of the technical comparison, the outburst coal seam water injection outburst elimination technology and the outburst elimination effect test method are provided, wherein the outburst coal seam water injection outburst elimination technology is simple in structure and good in detection effect, and can be used for simulating the change of a large-scale outburst coal seam under the three-field coupling condition of a stress field, a seepage field and a temperature field and further carrying out a gas outburst test on the outburst coal seam after water injection.
In order to achieve the technical purpose, the outburst elimination technology for water injection of the outburst coal seam and the outburst elimination effect test method are characterized by comprising the following steps of: the method comprises the steps of early preparation, outburst inoculation, outburst before coal seam water injection, outburst verification after coal seam water injection and outburst elimination effect inspection; the method comprises the following specific steps:
1a) sampling a outburst coal seam from a coal mine area to be tested, carrying out on-site investigation, measuring relevant parameters of the outburst coal seam by using the coal block samples collected on site, and determining test parameters such as gas pressure, ground stress, water injection drilling, water injection rate, water injection time and the like in a test scheme;
1b) using a crushing sieve to sample and sieve the collected coal blocks into coal particles with the particle size of 0-1mm, adding water into the coal particles, and stirring to prepare a coal sample with the water content of 6% for later use;
1c) the method comprises the following steps of loading a coal sample with 6% of water content into a visual box body, wherein the visual box body comprises a box body cavity and a box body cover plate, a sealing ring is arranged between the box body cavity and the box body cover plate and is fixed by using a sealing bolt, the right side of the visual box body is provided with a protruding opening, the bottom of the visual box body and the outside are provided with box body inflation openings, the top of the visual box body, the left side wall and the front side wall of the visual box body are provided with a plurality of transparent loading plates, the transparent loading plates at the top of the visual box body are respectively provided with X1-X6 in sequence number, the transparent loading plates on the front side wall of the visual box body are respectively provided with Y1-Y6 in sequence number, the transparent loading plates on the left side; the back of the visual box body is provided with a plurality of mounting holes in uniform steps, wherein the mounting holes of the visual box body are provided with external connectors, a sealing gasket is arranged between the external connectors and the box body wall of the visual box body, air pressure sensors, temperature sensors or multifunctional drill holes are arranged in the mounting holes as required, the multifunctional drill holes comprise hole sealing sections and ventilating sections, the total length of the multifunctional drill holes is 0.5m, the length of the hole sealing sections is 0.15m, the length of the ventilating sections is 0.35m, ventilating holes are distributed in the circumferential direction and the radial direction of the pipe wall of the ventilating sections, the multifunctional drill holes are provided with the serial number of A1-, respectively embedding air pressure sensors into the coal samples with the water content of 6% in the visual box body by using mounting holes formed in the back of the visual box body, and finally driving the transparent loading plates by using loading pistons to enable the coal samples with the water content of 6% to be molded for 1 hour under the condition of 20MPa and then releasing the pressurization of all the transparent loading plates on the coal samples;
1d) the instantaneous pop-out door is installed in a pop-out opening formed in the right side of the visual box body and comprises a rupture disk holder, one end of the rupture disk holder is provided with an installation flange, a first-stage rupture disk and a second-stage rupture disk which are connected in series are arranged inside the rupture disk holder respectively, the bursting pressure of the first-stage rupture disk is 0.4/MPa, the bursting pressure of the second-stage rupture disk is 0.6/MPa, the rupture disk holder between the first-stage rupture disk and the second-stage rupture disk is provided with an air source system, the first-stage rupture disk and the second-stage rupture disk are inflated to the space until the second-stage rupture disk is opened, and meanwhile, the first-stage rupture disk is induced instantaneously to realize instantaneous pop-out of the pop-out opening so as to simulate the pop-out working condition induced by violent induction factors such as rock cross-;
1e) the box body cover plate is sealed, the high-pressure gas cylinder, the vacuum pump and the flowmeter I are sequentially connected, the output end of the flowmeter I is connected with a box body inflation inlet through a pipeline, an external connector is arranged in a multifunctional drilling hole with the serial number of A3 at the rear part of the visual box body and connected with the flowmeter II, an outlet pipeline of the flowmeter II is connected with the water pump, and the box body and the sealing effect of each pipeline are detected;
1f) high-speed cameras are respectively arranged on the outer side of the visual box body and the instantaneous protruding door;
2a) subjecting the coal sample to a triaxial stress loading operation to apply stress to the coal sample: wherein the top transparent loading plates with serial numbers of X1-X6 of the coal sample are all applied with stress of 6MPa, and the front 6 transparent loading plates with serial numbers of Y1-Y6 of the coal sample are all applied with stress of 8 MPa; 1 transparent loading plates with the serial number Z1 on the left apply stress of 10 MPa;
2b) starting a vacuum pump to perform vacuum pumping operation on the coal sample through a box body gas filling port, and closing the vacuum pump until the internal air pressure of the coal sample is less than 100Pa, wherein the time is about 12 hours;
2c) the method comprises the following steps of performing gas filling operation on a coal sample through a box body gas filling port at the bottom of a visual box body by using a high-pressure gas bottle, totally dividing into four stages to ensure that the adsorption equilibrium pressure of the coal sample is 0.74MPa, filling gas for 12h in the first stage and the gas filling pressure is 0.3MPa, and then closing the gas bottle for stabilizing for 6 h; in the second stage, the gas is filled for 12 hours, the gas filling pressure is 0.6MPa, and then the gas cylinder is closed and stabilized for 6 hours; in the third stage, the gas is filled for 12 hours, the gas filling pressure is 0.74MPa, then the gas cylinder is closed, and the stability is 6 hours; the fourth stage is used for inflating for 6 hours, inflating and stabilizing to 0.74MPa, then the gas cylinder is closed, the total time consumption is about 60 hours, and the gas filling amount is recorded through the flowmeter I in the inflating process; meanwhile, the gas is filled to 0.3MPa through a gas filling port between the first-stage rupture disk and the second-stage rupture disk of the instantaneous outburst door through a high-pressure gas bottle;
3a) inflating a gas filling port between a first-stage rupture disk and a second-stage rupture disk of the instantaneous outburst door by using a high-pressure gas bottle to be more than 0.4MPa, so that the first-stage rupture disk and the second-stage rupture disk are successively ruptured, and underground gas outburst is simulated;
3b) collecting images for simulating coal dust ejection in the gas outburst by using a high-speed camera, stopping stress loading of the transparent loading plate after the simulated gas outburst is finished, and collecting and weighing the coal dust thrown out of the outburst opening;
4a) repeating the steps 1 c-2 c, and then performing water injection operation on the coal sample through the multifunctional drill hole by using a water pump;
5a) after water injection is finished, inflating the inflation inlet between the first-level rupture disk and the second-level rupture disk of the instantaneous outburst door by using a high-pressure gas cylinder to be more than 0.4MPa, so that the first-level rupture disk and the second-level rupture disk are successively ruptured to test whether outburst occurs;
5b) collecting images simulating coal dust ejection in the gas protrusion by using a high-speed camera, waiting for the protrusion to be finished after the protrusion occurs, stopping stress loading of the transparent loading plate, collecting coal dust ejected from the protrusion opening, and weighing the coal dust;
6a) changing the test conditions of water injection drilling, water injection rate and water injection time in sequence, repeating the test steps to perform the test again and recording related information, wherein the test comprises the following steps:
when the multifunctional drilling hole with the serial number of A3 is used for water injection, the water injection rate is controlled to be 1.0mL/s, the water injection is performed for 2 hours and 5 hours, and the water injection rate is controlled to be 5.0mL/s, the water injection is performed for 2 hours and 5 hours;
or the multifunctional drill hole with the serial number of A3 and the multifunctional drill hole with the serial number of A4 are simultaneously used for injecting water into the coal sample, the water injection rate of the two multifunctional drill holes is controlled to be 1.0mL/s at first, the water injection is carried out for 2 hours and 5 hours, and the water injection rate of the two multifunctional drill holes is 5.0mL/s, the water injection is carried out for 2 hours and 5 hours;
and (4) judging the best outburst elimination mode according to whether the outburst is highlighted or the outburst elimination effect through the experiment.
7a) Calculating the protrusion strength before and after water injection operation according to the mass of the thrown coal powder: the mass of the thrown coal powder is more than the total mass of the coal, and if no outburst occurs, the outburst strength is marked as 0;
7b) the outburst intensity under different water injection conditions is compared with the outburst intensity before water injection to evaluate and test the outburst elimination effect of the coal seam water injection, and if the outburst intensity is reduced after the coal seam water injection, the coal seam water injection outburst elimination effect is better; otherwise, no effect is obtained; and simultaneously, the water injection condition can be further optimized.
The test conditions for changing the water injection drilling, the water injection rate and the water injection time comprise that:
when the multifunctional drilling hole with the serial number of A3 is used for water injection, the water injection rate is controlled to be 1.0mL/s, the water injection is performed for 2 hours and 5 hours, and the water injection rate is controlled to be 5.0mL/s, the water injection is performed for 2 hours and 5 hours;
or the multifunctional drill hole with the serial number of A3 and the multifunctional drill hole with the serial number of A4 are simultaneously used for injecting water into the coal sample, the water injection rate of the two multifunctional drill holes is controlled to be 1.0mL/s at first, the water injection is carried out for 2 hours and 5 hours, and the water injection rate of the two multifunctional drill holes is 5.0mL/s, the water injection is carried out for 2 hours and 5 hours;
and (4) judging the best outburst elimination mode according to whether the outburst is highlighted or the outburst elimination effect through the experiment.
Has the advantages that:
the method can simulate the outburst elimination process of coal seam water injection under different true triaxial stress and gas pressure multi-field coupling conditions indoors, can synchronously monitor and collect the gas pressure, temperature, surface crack form and gas outburst strength of the coal seam, and provides an effective means for researching the outburst prevention effect and optimizing outburst prevention measures under different water injection conditions.
The invention has the advantages that: (1) the large-scale outburst coal seam under the coupling conditions of a stress field, a seepage field and a temperature field can be simulated, and the actual occurrence state of the onsite outburst coal seam is more approximate; (2) the outburst elimination test of water injection of the outburst coal seam can be carried out under different conditions; (3) and a gas outburst test can be further carried out on the outburst coal seam after water injection, and the water injection outburst elimination effect is checked and evaluated according to the test result.
Description of the drawings:
fig. 1 is a schematic structural view of a visual box used in the outburst elimination technology and the outburst elimination effect testing method for water injection of the outburst coal seam.
FIG. 2 is a top view of a visual box used in the outburst elimination technique and outburst elimination effect testing method for water injection of a protruding coal seam according to the present invention.
FIG. 3 is a rear view of a visual box used in the outburst elimination technique and outburst elimination effect testing method for water injection of a protruding coal seam according to the present invention.
Fig. 4 is a schematic structural diagram of a loading system used in the outburst elimination technique and outburst elimination effect testing method for water injection of a protruding coal seam.
Fig. 5(a) is a schematic view of the installation of the gas pressure sensor used in the outburst elimination technique and outburst elimination effect testing method for water injection of the outburst coal seam according to the invention.
Fig. 5(b) is a schematic view of the installation of the temperature sensor used in the outburst elimination technique and outburst elimination effect testing method for water injection of the outburst coal seam according to the invention.
Fig. 5(c) is a schematic view of installation of a multifunctional drill hole used in the outburst elimination technique and outburst elimination effect testing method for water injection of a protruding coal seam according to the present invention.
Fig. 6 is a schematic diagram of the shooting position of the outburst elimination technology and the outburst elimination effect testing method for water injection of the outburst coal seam.
Fig. 7 is a schematic structural view of an instantaneous outburst door used in the outburst elimination technology and the outburst elimination effect testing method for coal seam flooding.
Fig. 8 is a water injection outburst elimination connection diagram used in the outburst elimination technology and outburst elimination effect testing method for the coal seam injection. In the figure: 1-visual box body, 2-box body cavity, 3-box body cover plate, 4-protrusion opening, 5-sealing ring, 6-sealing bolt, 7-box body inflation opening, 8-mounting hole, 9-transparent loading plate, 10-loading piston, 11-air pressure sensor, 12-sealing gasket, 13-PU pneumatic connector, 14-PU pipe, 15-data line, 16-temperature conversion connector, 17-temperature sensor, 18-external connector, 19-multifunctional drilling hole, 20-hole sealing section, 21-air permeable section, 22-air permeable small hole, 23-high speed camera, 24-instantaneous protrusion door, 25-mounting flange, 26-blasting piece holder, 27-primary blasting piece, 28-secondary blasting piece, 29-protruding door inflation inlet, 30-high pressure gas cylinder, 31-vacuum pump, 32-flowmeter I, 33-flowmeter II and 34-water pump.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
Embodiments of the present invention are further described below with reference to the accompanying drawings.
As shown in fig. 1, the outburst elimination technique and outburst elimination effect testing method for water injection of the outburst coal seam of the invention comprises the following steps: the method comprises the steps of early preparation, outburst inoculation, outburst before coal seam water injection, outburst verification after coal seam water injection and outburst elimination effect inspection; the method comprises the following specific steps:
1a) sampling coal blocks protruding out of a coal seam from a coal mine area to be tested for on-site investigation, measuring relevant parameters of the protruding coal seam by using the on-site collected coal block samples, and determining test parameters such as gas pressure, ground stress, water injection drilling, water injection rate, water injection time and the like in a test scheme;
1b) using a crushing sieve to sample and sieve the collected coal blocks into coal particles with the particle size of 0-1mm, adding water into the coal particles, and stirring to prepare a coal sample with the water content of 6% for later use;
1c) a coal sample with 6% of water content is loaded into a visual box body 1, as shown in figures 1 and 2, the visual box body 1 comprises a box body cavity 2 and a box body cover plate 3, a sealing ring 5 is arranged between the box body cavity 2 and the box body cover plate 3 and is fixed by a sealing bolt 6, the right side of the visual box body 1 is provided with a protrusion opening 4, the bottom of the visual box body 1 and the outside are provided with a box body inflation opening 7, as shown in figure 4, a plurality of transparent loading plates 9 are arranged on the top of the visual box body 1 and the left side wall and the front side wall of the visual box body 1, the transparent loading plate 9 at the top of the visual box body 1 has six serial numbers X1-X6, the transparent loading plate 9 on the front side wall of the visual box body 1 has six serial numbers Y1-Y6, the transparent loading plates 9 on the left side wall of the visual box body 1 are Z1, each transparent loading plate 9 is provided with a loading piston 10, and the loading pistons 10 penetrate through the wall of the box body and are communicated with a pressurizing oil cylinder; as shown in fig. 3, a plurality of mounting holes 8 are uniformly formed in the back of the visual box 1, wherein an external connector 18 is arranged on each mounting hole 8 of the visual box 1, a sealing gasket 12 is arranged between each external connector 18 and the box wall of the visual box 1, an air pressure sensor 11, a temperature sensor 17 or a multifunctional drill 19 is arranged in each mounting hole 8 as required, each multifunctional drill 19 comprises a hole sealing section 20 and an air permeable section 21, the total length of each multifunctional drill 19 is 0.5m, the length of each hole sealing section 20 is 0.15m, the length of each air permeable section 21 is 0.35m, air permeable holes 22 are distributed in the circumferential direction and the radial direction of the tube wall of each air permeable section 21, the serial number of each multifunctional drill 19 is a1-a6, the air pressure sensors 11 are respectively embedded into 6% of coal samples with the water content in the visual box 1 through the mounting holes 8 formed in the back of the visual box 1, and finally, a loading piston 10 is used for driving a transparent loading plate 9 to enable the coal 9, pressurizing the coal sample;
as shown in fig. 5(a), an air pressure sensor 11 is inserted from a sensor mounting hole 8 at the outer side of a visual box body 1 by using a sealing gasket 12, the tail end of the air pressure sensor 11 is connected with a data acquisition and control system through a data line 15, a PU pipe 14 extending and arranged inside a coal sample is arranged at the inner side of the sensor mounting hole 8, gas pressures at different positions are tested by adjusting the position of the opening end of the PU pipe 14, and a PU pneumatic joint 13 is arranged between the PU pipe 14 and the box body wall of the visual box body 1;
as shown in fig. 5(b), the data line 15 connected to the tail of the temperature sensor 17 is fixed in the sensor mounting hole 19 of the visualization box 1 through the adapter 16 and the gasket 12, and the temperature sensor 17 and the data line 15 at the head are buried in the coal sample at the position where the temperature or the stress needs to be detected;
as shown in fig. 5(c), a multifunctional drill hole is arranged in a drill hole mounting hole, an external connector is arranged at the tail of the multifunctional drill hole on the visual box body 1, a sealing gasket is arranged between the external connector and the box body wall of the visual box body 1, the multifunctional drill hole comprises a hole sealing section 20 and a ventilation section 21, the total length of the multifunctional drill hole is 0.5m, the hole sealing section 20 is 0.15m long, the ventilation section 21 is 0.35m long, ventilation holes are distributed in the circumferential direction and the radial direction of the tube wall of the ventilation section 21, the aperture of the ventilation holes is 2mm, the distance is 5mm, and the multifunctional drill hole has the functions;
1d) as shown in fig. 7, an instantaneous popping door 24 is installed in a protrusion opening 4 formed in the right side of a visual box body 1, the instantaneous popping door 24 comprises a rupture disk holder 26, one end of the rupture disk holder 26 is provided with a mounting flange 25, a first-stage rupture disk 27 and a second-stage rupture disk 28 which are mutually connected in series are respectively arranged in the rupture disk holder 26, the bursting pressure of the first-stage rupture disk 27 is 0.4/MPa, the bursting pressure of the second-stage rupture disk 28 is 0.6/MPa, 29 is arranged on the rupture disk holder 26 between the first-stage rupture disk 27 and the second-stage rupture disk 28, the space between the first-stage rupture disk 27 and the second-stage rupture disk 28 is inflated to open the second-stage rupture disk 28 through an air source system, and simultaneously the first-stage rupture disk 27 is instantaneously detonated to realize instantaneous opening of the protrusion opening 4 so as to simulate the protrusion working condition induced by inducing factors such as violent rock cross-cut coal and;
as shown in fig. 5(a), an air pressure sensor 11 is arranged in the mounting hole 8, the air pressure sensor 11 is inserted into the sensor mounting hole 8 outside the visual box 1 by using a sealing gasket 12, the tail end of the air pressure sensor 11 is connected with a data acquisition and control system by a data line 15, a PU pipe 14 extending and arranged inside the coal sample is arranged inside the sensor mounting hole 8, the gas pressure at different positions is tested by adjusting the position of the open end of the PU pipe 14, and a PU pneumatic connector 13 is arranged between the PU pipe 14 and the box wall of the visual box 1;
as shown in fig. 5(b), a temperature sensor 17 is arranged in the mounting hole 8, a data line 15 connected with the tail part of the temperature sensor 17 is fixed in a sensor mounting hole 19 of the visualization box body 1 through a conversion joint 16 and a sealing gasket 12, and the temperature sensor 17 and the data line 15 at the head part are buried in a position of a coal sample where temperature or stress needs to be detected;
as shown in fig. 5(c), a multifunctional drill hole is arranged in the mounting hole 8, an external connector is arranged at the tail of the multifunctional drill hole on the visual box body 1, a sealing gasket is arranged between the external connector and the box body wall of the visual box body 1, the multifunctional drill hole comprises a hole sealing section 20 and a ventilation section 21, the total length of the multifunctional drill hole is 0.5m, the hole sealing section 20 is 0.15m long, the ventilation section 21 is 0.35m long, ventilation holes are distributed in the circumferential direction and the radial direction of the tube wall of the ventilation section 21, the aperture of the ventilation holes is 2mm, the distance is 5mm, and the multifunctional drill hole has the functions of;
1e) as shown in fig. 8, a box cover plate 1 is sealed, a high-pressure gas cylinder 30, a vacuum pump 31 and a flowmeter i 32 are sequentially connected, the output end of the flowmeter i 32 is connected with a box inflation inlet 7 through a pipeline, an external connector 18 is arranged in a multifunctional drilling hole a3 at the rear part of a visual box 1 and is connected with a flowmeter ii 33, an outlet pipeline of the flowmeter ii 33 is connected with a water pump 34, and the sealing effects of the box and each pipeline are detected;
1f) as shown in fig. 6, high-speed cameras 23 are respectively arranged outside the visualization box body 1 and at the instantaneous protruding door 24;
2a) subjecting the coal sample to a triaxial stress loading operation to apply stress to the coal sample: wherein 6 transparent loading plates 9 with serial numbers of X1-X6 on the top of the coal sample are all applied with stress of 6MPa, and 6 transparent loading plates 9 with serial numbers of Y1-Y6 on the front side are all applied with stress of 8 MPa; the left 1 transparent loading plates 9 with the serial number Z1 exert the stress of 10 MPa;
2b) starting a vacuum pump 31 to perform vacuum pumping operation on the coal sample through a box body air charging port 7, and closing the vacuum pump 31 after the internal air pressure of the coal sample is less than 100Pa, wherein the time for use is about 12 hours;
2c) the method comprises the following steps of performing gas filling operation on a coal sample through a box body gas filling port 7 at the bottom of a visual box body 1 by using a high-pressure gas bottle 30, dividing the operation into four stages to ensure that the adsorption equilibrium pressure of the coal sample is 0.74MPa, filling gas for 12h in the first stage and the gas filling pressure is 0.3MPa, and then closing the gas bottle for stabilizing for 6 h; in the second stage, the gas is filled for 12 hours, the gas filling pressure is 0.6MPa, and then the gas cylinder is closed and stabilized for 6 hours; in the third stage, the gas is filled for 12 hours, the gas filling pressure is 0.74MPa, then the gas cylinder is closed, and the stability is 6 hours; the fourth stage is used for inflating for 6 hours, inflating and stabilizing to 0.74MPa, then the gas cylinder is closed, the total time consumption is about 60 hours, and the gas filling amount is recorded through the flowmeter I in the inflating process; meanwhile, the air is filled to 0.3MPa through an air filling port between the first-stage rupture disk 27 and the second-stage rupture disk 28 of the instantaneous outburst door 24 by a high-pressure air bottle 30;
3a) inflating a gas filling port between the primary rupture disk 27 and the secondary rupture disk 28 of the instant outburst door 24 by using a high-pressure gas bottle 30 to be more than 0.4MPa, so that the primary rupture disk 27 and the secondary rupture disk 28 are successively ruptured, and underground gas outburst is simulated;
3b) acquiring an image simulating the ejection of the coal dust in the gas outburst by using a high-speed camera 23, stopping stress loading of the transparent loading plate 9 after the simulated gas outburst is finished, and collecting and weighing the coal dust thrown out of the outburst opening 4;
4a) repeating the steps 1 c-2 c, and then performing water injection operation on the coal sample through the multifunctional drill hole by using a water pump 34;
5a) after the water injection is finished, inflating more than 0.4MPa to an inflation inlet between the first-level rupture disk 27 and the second-level rupture disk 28 of the instantaneous outburst door 24 by using a high-pressure gas bottle 30, so that the first-level rupture disk 27 and the second-level rupture disk 28 are successively ruptured to test whether the outburst occurs;
5b) acquiring an image simulating the ejection of the coal dust in the gas protrusion by using a high-speed camera 23, waiting for the protrusion to be finished after the protrusion occurs, stopping the stress loading of the transparent loading plate 9, collecting the coal dust ejected from the protrusion port 4 and weighing the coal dust;
6a) changing the test conditions of water injection drilling, water injection rate and water injection time in sequence, repeating the test steps to perform the test again and recording related information, wherein the test comprises the following steps:
when the multifunctional drill hole 19 with the serial number of A3 is used for water injection, the water injection rate is controlled to be 1.0mL/s, the water injection is performed for 2 hours and 5 hours, and the water injection rate is 5.0mL/s, the water injection is performed for 2 hours and 5 hours;
or the multifunctional drill 19 with the serial number of A3 and the multifunctional drill 19 with the serial number of A4 are simultaneously used for injecting water into the coal sample, the water injection rate of the two multifunctional drills is controlled to be 1.0mL/s at first, the water injection is carried out for 2 hours and 5 hours, and the water injection rate of the two multifunctional drills is 5.0mL/s at second, the water injection is carried out for 2 hours and 5 hours;
and (4) judging the best outburst elimination mode according to whether the outburst is highlighted or the outburst elimination effect through the experiment.
7a) Calculating the protrusion strength before and after water injection operation according to the mass of the thrown coal powder: the mass of the thrown coal powder is more than the total mass of the coal, and if no outburst occurs, the outburst strength is marked as 0;
7b) the outburst intensity under different water injection conditions is compared with the outburst intensity before water injection to evaluate and test the outburst elimination effect of the coal seam water injection, and if the outburst intensity is reduced after the coal seam water injection, the coal seam water injection outburst elimination effect is better; otherwise, no effect is obtained; and simultaneously, the water injection condition can be further optimized.
The specific test scheme comprises:
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