CN112855073B - Device and method for solidifying coal bed by using microorganisms in cross-cut coal uncovering process - Google Patents
Device and method for solidifying coal bed by using microorganisms in cross-cut coal uncovering process Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
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- E—FIXED CONSTRUCTIONS
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- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/006—Production of coal-bed methane
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- E—FIXED CONSTRUCTIONS
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- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/30—Specific pattern of wells, e.g. optimising the spacing of wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B7/00—Special methods or apparatus for drilling
- E21B7/04—Directional drilling
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- E21C—MINING OR QUARRYING
- E21C41/00—Methods of underground or surface mining; Layouts therefor
- E21C41/16—Methods of underground mining; Layouts therefor
- E21C41/18—Methods of underground mining; Layouts therefor for brown or hard coal
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- E—FIXED CONSTRUCTIONS
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- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/001—Improving soil or rock, e.g. by freezing; Injections
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
- E21F15/005—Methods or devices for placing filling-up materials in underground workings characterised by the kind or composition of the backfilling material
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
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Abstract
The invention belongs to the technical field of coal mine underground roadway tunneling, and particularly discloses a device and a method for solidifying a coal bed by utilizing microorganisms in the rock cross-cut coal uncovering process, wherein a cementing liquid pool, a fixed liquid pool, a bacteria liquid pool, a grouting pump, an electromagnetic valve, a pressure sensor, a flow sensor, a grouting pipe, a capsule hole packer and an automatic control system are sequentially injected into a grouting solidification hole through the grouting pump, the electromagnetic valve, a pipeline sensor and the automatic control system are connected to form a feedback system to control the slurry injection, the injected pressurized microorganism bacteria liquid enters gaps or cracks of a coal (rock) layer, then the fixed liquid is injected, the strains are uniformly distributed by utilizing the flocculation of the fixed liquid, and finally the intermittently injected cementing liquid enables the strains to fully perform cementing mineralization so as to achieve the purpose of solidifying the coal bed, and the gaps and the holes are sealed by calcium carbonate deposition generated by microorganism induction, the porosity of the coal bed is reduced, and the conversion of the adsorbed gas to the free gas is slowed down.
Description
Technical Field
The invention belongs to the technical field of underground coal mine roadway tunneling, and particularly relates to a device and a method for solidifying a coal bed by using microorganisms in a cross-cut coal uncovering process.
Background
With the rapid development of the coal industry in China, old mines are exploited more and more deeply, protruding mines are increased increasingly, the protruding times are greatly increased, and the protruding strength is also improved, wherein the protruding frequency, strength and danger of rock cross coal uncovering are obviously higher than those of other operation modes. The outstanding problem when the cross cut coal is uncovered seriously threatens the safety of underground workers and simultaneously restricts the high-efficiency production of the coal mine. The reason that the outburst accidents in the rock cross-cut place are frequent and the outburst strength is high is that the stress state of the front coal rock of the coal uncovering working face is easy to change suddenly, so that the elastic potential of the rock and the coal bed and the gas energy are released in large quantity, and the coal body strength is a key factor for resisting the outburst.
The existing common coal uncovering method for the outburst coal seam is mainly carried out from two aspects of pressure relief, permeability increase and coal seam reinforcement. The coal seam pressure relief and permeability increase mode mainly comprises measures such as hydraulic punching, hydraulic fracturing and hydraulic slotting. The pressure relief and permeability increase mode causes the coal bodies to be damaged in different degrees in the implementation process, reduces the self bearing capacity and the outstanding resistance capacity of the coal bed, and particularly has more serious influence on soft coal beds or broken zones of geological structures. The coal seam reinforcement mainly comprises a metal framework and grouting reinforcement. Although the metal framework has a certain supporting function on the coal body, at least one end of the metal framework is not fixed in the using process, the metal framework and the coal body are not bonded together, when the coal body deforms, the metal framework mainly resists the deformation of the coal body by means of bending strength, the strength of the coal body is not changed essentially, and the resisting effect is poor. The grouting solidification technology overcomes the defects of the conventional measures, and the curing agent with proper performance is pressed into the coal seam to enable the curing agent to penetrate into cracks and pores in the coal seam. The commonly used coal-rock body reinforcing agent mainly comprises polyurethanes, epoxy resins, acrylamides, acrylates, urea-formaldehyde resins and the like. Through solidification filling, on one hand, the strength of the coal body can be improved, the self bearing capacity of the coal body is increased, and the effect of the external coal body blocking and protruding is enhanced; on the other hand, the solidification outburst prevention increases the strength of the coal body, meanwhile, a channel for gas migration cannot be blocked, and the phenomenon of borehole collapse cannot occur on the premise that gas extraction is not affected in the subsequent gas extraction process. However, the traditional curing agent has weak permeability and small diffusion radius, can only cure a small range of coal seams around a grouting hole, is mostly a high molecular substance, has large property difference with coal, is often toxic and easily causes environmental pollution.
The microorganism induced carbonate precipitation is a mineralization effect generated in a metabolism process of microorganisms, and the formed calcium carbonate has excellent consolidation performance, is a biotechnology with simple mechanism, low cost, rapidness, high efficiency and environmental friendliness, is concerned by workers in industries such as civil engineering, environment and the like, but is rarely applied to the mine field in China.
At present, in a 'freezing type rock cross-cut coal uncovering method' disclosed in patent No. CN201710749493.2, the strength of a coal body is improved by freezing a coal seam injected with water through heat absorption by liquid nitrogen evaporation, but this method needs to consume a large amount of liquid nitrogen, the cost is high, the curing time of the coal body is short, and the strength of the frozen coal seam is reduced after the temperature is increased. Meanwhile, in a cross-cut sealing method combining hydraulic fracturing and grouting solidification disclosed in patent No. CN201310112121.0, the smooth injection of the solidified slurry is ensured by performing hydraulic fracturing on the coal seam before grouting solidification to enable the cracks to be communicated; although the method increases the curing range, the method is more complicated, hydraulic fracturing is required before curing, and the cost and the workload are increased; and the curing agent may cause environmental pollution.
Disclosure of Invention
The invention aims to provide a device and a method for solidifying a coal bed by using microorganisms in the cross-cut coal uncovering process, which are used for carrying out cementation solidification on a nearby coal bed in the cross-cut coal uncovering process by using the mineralization of the microorganisms, so that the occurrence probability of gas outburst accidents in the cross-cut coal uncovering process is reduced.
In order to achieve the purpose, the invention adopts the technical scheme that:
the device comprises a slurry tank and a grouting pump, wherein the slurry in the slurry tank is pumped out and delivered to a fracture of a drilled hole of the coal bed, the grouting pump delivers the slurry to the fracture through a grouting pipe at the end part of the grouting pump, a capsule hole sealing device is arranged at the end part of the grouting pipe, the slurry tank comprises a bacteria liquid tank, a fixed liquid tank and a cementing liquid tank, outlet pipelines of the bacteria liquid tank, the fixed liquid tank and the cementing liquid tank are respectively connected with the grouting pump, and a first electromagnetic valve is arranged on the grouting pipe.
Furthermore, a second electromagnetic valve is arranged on the bacteria liquid pool outlet pipeline, a third electromagnetic valve is arranged on the fixed liquid pool outlet pipeline, a fourth electromagnetic valve is arranged on the cementing liquid pool outlet pipeline, and bacteria liquid concentration OD is contained in the bacteria liquid pool 600 2.0 of pasteurella bacillus liquid, and 0.05mol/L of fixing liquid CaCl is filled in a fixing liquid pool 2 urea-Ca with concentration of 0.4-1.0mol/L is filled in the cementing liquid pool 2+ And (3) mixing the solution.
Further, still be equipped with pressure sensor and flow sensor on the slip casting pipe, first solenoid valve, second solenoid valve, third solenoid valve, fourth solenoid valve, grouting pump, pressure sensor and flow sensor are connected with the automatic control system electricity respectively.
A method for solidifying a device for solidifying a coal seam by utilizing microorganisms in a cross-cut coal uncovering process comprises the following steps:
1) stopping forward tunneling at a position where the minimum normal distance from the coal uncovering working face of the roadway to the coal seam is equal to 7m, setting a curing area in a vertical distance of 4m along the periphery of the roadway, designing and arranging gas extraction holes according to the curing area, and simultaneously performing grouting curing by taking the gas extraction holes as grouting curing holes;
2) and (3) calculating the bacterial liquid volume required by solidification according to the following calculation formula: v 1 =V×φ，V 1 The volume of solidified bacterial liquid required for solidification, the volume of coal body in a V solidification area and the porosity of phi coal body;
3) preparing a bacterial liquid and a cementing liquid, wherein the volume ratio of the bacterial liquid to the cementing liquid is 1: 10;
4) drilling a grouting curing hole according to the designed coal seam direction, placing a grouting pipe into the grouting curing hole, sequentially connecting required equipment and the grouting pipe, and opening a capsule hole sealing device to seal holes;
5) starting an automatic control system, opening a first electromagnetic valve and a second electromagnetic valve, opening a grouting pump, reaching a grouting solidification hole through a grouting pipe, and diffusing a bacterial liquid from cracks or gaps of a coal seam on the wall of the grouting hole to a region near the grouting hole; 6) after the injection of the bacteria liquid is finished, the second electromagnetic valve is closed, the third electromagnetic valve is opened, and CaCl in the fixed liquid tank 2 When the coal seam gas reaches a grouting curing hole, controlling the flow to be 10-15L/min, closing the third electromagnetic valve, opening the fourth electromagnetic valve, injecting cementing liquid, controlling the grouting speed of the cementing liquid to be 2-6L/min, wherein the cementing liquid adopts an intermittent injection method, namely an automatic control system controls an injection pump to be closed for three hours after being injected for three hours, a pressure sensor transmits a grouting pressure signal to the automatic control system, when the grouting pressure reaches the limit grouting pressure, grouting is stopped, the grouting hole is cured, the equipment is moved to the next curing hole for curing until all curing holes are cured, the equipment is cleaned and removed, the grouting curing holes and the gas extraction drill holes which are cured are connected with a gas extraction pipe network for extraction, and when the coal seam gas content is less than 8m 3 And when the pressure is within the range of 5m, stopping pumping, tunneling to the coal seam, constructing a gas discharge hole, mixing the coal dust discharged from the drill hole with the bacterial liquid, the fixing liquid and the cementing liquid, backfilling by a slurry pump, and further reinforcing the coal seam.
Further, it is characterized byThe bacterial liquid in the step 3) is OD 600 2.0 pasteur bacillus liquid, and 0.05mol/L CaCl as stationary liquid 2 urea-Ca of 0.4-1.0mol/L for cementation 2+ And (4) mixing the solution.
The plugging mechanism is as follows: designing a curing hole according to a curing area and drilling the curing hole, collecting coal dust in the drilling process for subsequent drilling and backfilling, inserting a grouting pipe into the drilled curing hole, sealing the hole by using a capsule hole sealing machine, injecting a bacterium solution into the curing hole through the grouting pipe under the action of a grouting pump by adopting an intermittent step-by-step grouting method, and then injecting a fixing solution CaCl at the speed of 10-15L/min 2 Finally, injecting urea-Ca into the cementing liquid at a speed of 2-6L/min 2+ The pipe section of the grouting pipe is provided with a flow sensor, a pressure sensor and an electromagnetic valve which are connected to an automatic control system and used for controlling the grouting flow and monitoring and controlling the grouting pressure. Flow sensor gives automatic control system with thick liquid flow signal transmission, and automatic control system controls the flow size of pouring into different thick liquids through the control solenoid valve, and simultaneously, the pressure sensor who is located the solenoid valve rear passes grouting pressure signal to automatic control system, and automatic control system adjusts the grouting pressure of pump, prevents to run the thick liquid phenomenon and cause the destruction to the solidification coal body because of the too big appearance of grouting pressure.
Meanwhile, the grouting pump is connected to an automatic control system to realize the pouring and intermittent grouting of different grout. And after the grouting of the bacterial liquid is finished, the automatic control system sequentially controls the injection of the fixing liquid and the cementing liquid. In the cementing liquid grouting process, the system continuously performs grouting for 3 hours, and the automatic control system controls the grouting pump to stop grouting for 3 hours, so that microorganisms in the pores and cracks of the surrounding coal seam fully induce the precipitation of calcium carbonate crystals to cement the coal (rock) layer. In the grouting process, the pressurized bacteria liquid enters cracks and gaps around the drill hole and is solidified from inside to outside. And stopping grouting when the grouting pressure is suddenly increased, finishing the solidification of the drill holes, and connecting each drill hole into a gas extraction official network for gas extraction after all the drill holes are solidified. After the pumping and mining, the coal scraps collected in the drilling process are made into coal-based slurry for backfilling the drilled hole, so that gas outburst accidents caused by the fact that the inside of a coal body is empty and loose due to the dense construction of gas pumping holes are avoided.
The invention has the advantages that:
1. the method is a common biological induction mineralization reaction process through an MICP technology, namely a microorganism induction calcium carbonate deposition technology, can utilize spontaneous reaction in a microorganism metabolism process to induce mineral substances to precipitate cemented particles, and is applied to a rock cross-cut coal uncovering process, so that a coal body is cemented and solidified, and gas outburst accidents in the rock cross-cut coal uncovering process can be effectively prevented;
2. on one hand, the invention enables microorganisms to be adsorbed in pores and cracks around the drill hole, efficiently induces the precipitation of calcium carbonate, enables the inner surface of the coal seam to be glued, and increases the strength and the self-bearing capacity of the coal seam; meanwhile, the microorganism slurry is a solution or a suspension, the slurry has low viscosity, good fluidity and strong permeability, and the curing radius is large compared with that of a chemical grouting method;
3. the coal body is solidified before the gas extraction hole and the discharge hole are carried out, so that the strength of the coal body is increased, the hole collapse phenomenon can be effectively avoided, and the increase of workload due to repeated operation is avoided;
4. the hole is multipurpose, so that the coal rock body can be solidified, the coal bed gas can be pre-pumped, multiple drilling is not needed, and the workload is reduced on the premise of not increasing the danger;
5. the drill chip of drilling is made into coal-based slurry to backfill the drilling, so that the coal body dead zone can be filled, the coal seam strength is further increased, the coal chips are effectively utilized, and the method is more green and environment-friendly.
Drawings
FIG. 1 is a schematic view of a rock cross-cut coal curing grout hole;
FIG. 2 is a side view of a cross-cut coal curing zone;
FIG. 3 is a front view of a cross-cut coal curing zone;
fig. 4 is a schematic view of the present apparatus.
1-laneway; 2-coal bed; 3-a curing zone; 4-grouting and curing holes; 5-cementing a liquid pool; 6-fixing the liquid pool; 7-a fungus liquid pool; 8-grouting pump; 9-a first solenoid valve; 10-a pressure sensor; 11-a flow sensor; 12-grouting pipes; 13-capsule hole packer; 14-an automatic control system; 15-a fourth solenoid valve; 16-a third solenoid valve; 17-a second solenoid valve.
Detailed Description
As shown in the figure, a device for solidifying a coal seam by utilizing microorganisms in the cross-cut coal uncovering process comprises a slurry pool and a grouting pump 8 for pumping slurry in the slurry pool to a fracture of a drilled coal seam, wherein the grouting pump 8 delivers the slurry to the fracture through a grouting pipe 12 at the end part of the grouting pump 8, a capsule hole packer 13 is arranged at the end part of the grouting pipe 12, the slurry pool comprises a bacteria liquid pool 7, a fixed liquid pool 6 and a cementing liquid pool 5, outlet pipelines of the bacteria liquid pool 7, the fixed liquid pool 6 and the cementing liquid pool 5 are respectively connected with the grouting pump 8, a first electromagnetic valve 9 is arranged on the grouting pipe 12, a second electromagnetic valve 17 is arranged on an outlet pipeline of the bacteria liquid pool 7, a third electromagnetic valve 16 is arranged on an outlet pipeline of the fixed liquid pool 6, a fourth electromagnetic valve 15 is arranged on an outlet pipeline of the cementing liquid pool 5, and a bacteria liquid concentration OD is contained in the bacteria liquid pool 7 600 2.0 of pasteurella bacillus liquid, 0.05mol/L of stationary liquid CaCl is filled in a stationary liquid pool 6 2 urea-Ca with concentration of 0.4-1.0mol/L is filled in the cementing liquid pool 5 2+ Mixing the solution; still be equipped with pressure sensor 10 and flow sensor 11 on the slip casting pipe 12, first solenoid valve 9, second solenoid valve 17, third solenoid valve 16, fourth solenoid valve 15, grouting pump 8, pressure sensor 10 and flow sensor 11 are connected with automatic control system 14 electricity respectively.
When the method is used specifically, the bacteria liquid cultured in advance is injected into the bacteria liquid pool 7, wherein the concentration of the bacteria liquid is OD 600 = 2.0; respectively injecting 0.4-1.0mol/L of cementing liquid urea-Ca into the cementing liquid pool 5 and the stationary liquid pool 6 2+ Mixed liquid and 0.05mol/L stationary liquid, the cementing liquid pool 5, the stationary liquid pool 6 and the bacteria liquid pool 7 are respectively connected with a fourth electromagnetic valve 15, a third electromagnetic valve 16 and a second electromagnetic valve 17, the three electromagnetic valves are connected with an automatic control system 14 and are connected to an grouting pump 8 through pipelines, so that the automatic control system 14 controls the three electromagnetic valves to open and close to control the grouting pump 8 to inject different slurry, the slurry is accelerated by the grouting pump 8 and then enters a grouting pipe 12 from the outlet of the pump, and a first electromagnetic valve 9 and a pressing pipe 12 are sequentially arranged on the grouting pipe 12The force sensor 10 and the flow sensor 11 are connected with the automatic control system 14, the pressure sensor 10 and the flow sensor 11 respectively monitor grouting pressure and grouting flow of a pipeline and convert information into electric signals to be fed back to the automatic control system 14, and when the grouting flow exceeds a set value, the automatic control system 14 can control the opening of the first electromagnetic valve 9 to control the flow; when the grouting pressure exceeds the limit grouting pressure, the automatic control system 14 controls the grouting pump 8 to stop running, and a capsule hole packer 13 is arranged at the beginning end of the grouting hole for hole sealing of the grouting hole.
The technology and the device for curing by using the microorganisms before rock cross-cut coal uncovering comprise the following steps:
1. stopping forward tunneling at the position where the minimum normal distance between the coal uncovering working face of the roadway 1 and the coal seam 2 is equal to 7 m;
2. a curing area 2 is arranged within 4m of the vertical distance along the periphery of the roadway, gas extraction holes are designed and arranged according to the curing area, and the gas extraction holes are also used as grouting curing holes 4 for grouting curing;
3. and (3) calculating the required bacterial liquid volume for solidification according to the following calculation formula:
V1=V×φ
v1-the volume of solidified bacterial liquid required for solidification; v-volume of coal body in solidification area; phi-porosity of the coal body;
4. preparing sufficient bacterial liquid and cementing liquid, wherein the volume ratio of the bacterial liquid to the cementing liquid is 1: 10;
5. constructing a grouting curing hole 4 towards the direction of the coal seam according to the design;
6. placing the grouting pipe 12 into the grouting curing hole 4, and sequentially connecting subsequent equipment with the grouting pipe 12;
7. opening the capsule hole sealing device 13 to seal holes;
8. when the equipment is not opened, the first electromagnetic valve 9, the fourth electromagnetic valve 15, the third electromagnetic valve 16 and the second electromagnetic valve 17 are all in a closed state, the equipment is started, the automatic control system 14 controls the second electromagnetic valve 17 and the first electromagnetic valve 9 to be opened, then the grouting pump 8 is opened, the bacterial liquid in the bacterial liquid pool 7 reaches the grouting solidification hole 4 through the grouting pipe 12 under the action of the grouting pump 8, and the bacterial liquid is diffused to the area near the grouting hole 4 from the crack or the gap of the coal seam of the grouting hole wall under the action of pressure;
9. after the injection of the bacteria liquid is finished, under the control of the automatic control system 14, the second electromagnetic valve 17 is closed, the third electromagnetic valve 16 is opened, and CaCl in the liquid fixing tank 6 is fixed 2 The grouting liquid reaches the grouting solidification hole 4 under the action of a grouting pump 8, a flow sensor 11 monitors the flow of the stationary liquid in a grouting pipe 12, and information is transmitted to an automatic control system 14; the automatic control system 14 adjusts the flow rate to 10-15L/min by controlling the opening of the first electromagnetic valve 9;
10. then under the action of the automatic control system 14, closing the third electromagnetic valve 16, opening the fourth electromagnetic valve 15, stopping injecting the fixing liquid, starting injecting the cementing liquid, controlling the grouting speed of the cementing liquid to be 2-6L/min, and adopting an intermittent injection method for the cementing liquid, namely closing the automatic control system 14 after controlling the grouting pump 8 to inject the cementing liquid for three hours, so that the bacteria liquid can fully perform mineralization and cementation on cracks and gaps of the coal bed in the area near the wall of the grouting hole;
11. after microorganisms diffused into the coal seam are subjected to cementation mineralization, the diffusion capacity of cementing liquid in a coal (rock) layer is low, the grouting pressure is increased, in the step 10 process, a grouting pressure signal is transmitted to an automatic control system 14 by a pressure sensor 10, when the grouting pressure reaches the limit grouting pressure, grouting is stopped, and the grouting hole is cured;
12. moving the equipment to the next grouting curing hole 4 for curing until all the grouting curing holes 4 are cured, cleaning and moving the equipment out, connecting the cured grouting curing holes 4 and the gas extraction drill hole with a gas extraction pipe network for extraction, and when the gas content of the coal seam 2 is less than 8m 3 Stopping extraction at the time of/t;
13. and digging to a position 5m away from the coal seam, performing construction of a gas discharge hole, mixing coal scraps discharged from a drill hole with a bacterial liquid, a fixing liquid and a cementing liquid, backfilling by using a slurry pump, further reinforcing the coal seam, preventing gas outburst accidents caused by the fact that the inside of a coal body is empty and loose due to the intensive construction of the gas extraction hole, and performing subsequent operation.
Claims (2)
1. The device comprises a slurry pool and a grouting pump for pumping slurry in the slurry pool to a coal seam drilling crack, wherein the grouting pump delivers the slurry to the crack through a grouting pipe at the end part of the grouting pump, a capsule hole packer is arranged at the end part of the grouting pipe, the slurry pool comprises a bacteria liquid pool, a fixed liquid pool and a cementing liquid pool, outlet pipelines of the bacteria liquid pool, the fixed liquid pool and the cementing liquid pool are respectively connected with the grouting pump, a first electromagnetic valve is arranged on the grouting pipe, a second electromagnetic valve is arranged on an outlet pipeline of the bacteria liquid pool, a third electromagnetic valve is arranged on an outlet pipeline of the fixed liquid pool, a fourth electromagnetic valve is arranged on an outlet pipeline of the cementing liquid pool, a pressure sensor and a flow sensor are further arranged on the grouting pipe, and the first electromagnetic valve, the second electromagnetic valve, the third electromagnetic valve, The fourth electromagnetic valve, the grouting pump, the pressure sensor and the flow sensor are respectively electrically connected with the automatic control system, and the curing method is characterized by comprising the following steps of:
1) stopping forward tunneling at a position where the minimum normal distance from the coal uncovering working face of the roadway to the coal seam is equal to 7m, setting a curing area in a vertical distance of 4m along the periphery of the roadway, designing and arranging gas extraction holes according to the curing area, and simultaneously performing grouting curing by taking the gas extraction holes as grouting curing holes;
2) and (3) calculating the bacterial liquid volume required by solidification according to the following calculation formula: v 1 =V×φ，V 1 The volume of solidified bacterial liquid required for solidification, the volume of coal body in a V solidification area and the porosity of phi coal body;
3) preparing a bacterial liquid and a cementing liquid, wherein the volume ratio of the bacterial liquid to the cementing liquid is 1: 10;
4) drilling a grouting curing hole according to the designed coal seam direction, placing a grouting pipe into the grouting curing hole, sequentially connecting required equipment and the grouting pipe, and opening a capsule hole sealing device to seal holes;
5) starting an automatic control system, opening a first electromagnetic valve and a second electromagnetic valve, opening a grouting pump, reaching a grouting solidification hole through a grouting pipe, and diffusing a bacterial liquid from cracks or gaps of a coal seam on the wall of the grouting hole to a region near the grouting hole; 6) after the injection of the bacteria liquid is finished, the second electromagnetic valve is closed, andopening the three electromagnetic valves and fixing CaCl in the liquid tank 2 When the coal seam gas reaches a grouting curing hole, controlling the flow to be 10-15L/min, closing the third electromagnetic valve, opening the fourth electromagnetic valve, injecting cementing liquid, controlling the grouting speed of the cementing liquid to be 2-6L/min, wherein the cementing liquid adopts an intermittent injection method, namely an automatic control system controls an injection pump to be closed for three hours after being injected for three hours, a pressure sensor transmits a grouting pressure signal to the automatic control system, when the grouting pressure reaches the limit grouting pressure, grouting is stopped, the grouting hole is cured, the equipment is moved to the next curing hole for curing until all curing holes are cured, the equipment is cleaned and removed, the grouting curing holes and the gas extraction drill holes which are cured are connected with a gas extraction pipe network for extraction, and when the coal seam gas content is less than 8m 3 And when the pressure is within the range of 5m, stopping pumping, tunneling to the coal seam, constructing a gas discharge hole, mixing the coal dust discharged from the drill hole with the bacterial liquid, the fixing liquid and the cementing liquid, backfilling by a slurry pump, and further reinforcing the coal seam.
2. The method for solidifying the device for solidifying the coal seam by using the microorganisms in the cross-cut coal uncovering process as claimed in claim 1, wherein: the bacterial liquid in the step 3) is OD 600 2.0 of Pasteur bacillus liquid, and 0.05mol/L of CaCl as stationary liquid 2 The cementing liquid is 0.4-1.0mol/L urea-Ca 2+ And (4) mixing the solution.
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