Device and method for repairing and reconstructing coal mine water-resisting layer

Abstract

The invention belongs to the technical field of coal mine water-resisting layer reconstruction, and particularly relates to a device and method for repairing and reconstructing a coal mine water-resisting layer. On the basis of the MICP technology, the coal mine water-resisting layer is repaired and reconstructed by grouting the water-resisting layer through the ground, a microorganism solution and a cementing solution are efficiently, accurately and conveniently injected, rock mass fine pores can be injected, the device is environmentally friendly, reactants of different layers of the water-resisting layer are monitored in real time, injection parameters are regulated and controlled, and the water-resisting layer is repaired and reconstructed. The reaction efficiency of the microbial solution and the cementing liquid is improved, water guiding cracks of the water-resisting layer are blocked, efficient repairing of the water-resisting layer is achieved, and then water resource loss of the water-bearing layer is prevented. In addition, the method provided by the invention is low in cost and remarkable in economic benefit and ecological benefit, and has the potential of large-scale application.

Description

Technical Field

[0001] The invention belongs to the technical field of coal mine water-proof layer reconstruction, and in particular relates to a device and method for repairing and reconstructing a coal mine water-proof layer. Background Art

[0002] With the large-scale development of coal resources in Northwest my country, water shortage and the resulting environmental problems have become the main environmental constraints for large-scale development of coal in Northwest China. Therefore, coal development in Northwest China must protect groundwater resources. In order to protect the strong water-rich target aquifer or surface water body, underground or ground filling pumps and filling pipelines can be used to separate the aquiclude, curtain and top plate grouting methods.

[0003] The grouting materials currently used are mainly cement grouting and chemical grouting. Among them, cement grouting has the characteristics of abundant material sources, convenient slurry preparation, low cost and high bonding strength. It is currently the most widely used grouting material. However, cement slurry has high viscosity and contains large solid particles, making it difficult to penetrate small cracks in the rock mass.

[0004] Chemical grout has the advantages of low viscosity, good injectability and the ability to be injected into tiny pores in rock mass. However, the slurry materials used for chemical grouting are toxic to a certain extent and can easily cause pollution to the underground environment. Summary of the invention

[0005] The purpose of the present invention is to provide a device and method for repairing and regenerating aquiclude in coal mines. The method provided by the present invention can inject water into minute pores of rock mass, is environmentally friendly and has high repair efficiency.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] The present invention provides a method for repairing and regenerating a coal mine water-proof layer, comprising the following steps:

[0008] (1) injecting the bacterial solution into the aquiclude at a constant pressure until the bacterial solution fills the cracks in the aquiclude; injecting the cementing solution into the aquiclude at a constant pressure to carry out a urease-induced mineralization reaction with the bacterial solution;

[0009] (2) Repeat step (1) for more than one time until the cracks in the aquiclude are completely filled with calcium carbonate; the bacterial solution is urease bacteria; the OD600 of the urease bacteria is 1.0-2.5; and the cementing solution includes urea and a calcium source.

[0010] Preferably, the molar ratio of urea to calcium source in the cementing solution is 0.5-1.5:1; the concentration of urea in the cementing solution is 0.5-2 mol / L; and the single injection volume ratio of the cementing solution to the bacterial solution is 2-3:1.

[0011] Preferably, the pressure of the bacterial solution constant pressure injection is 0.2-1 MPa.

[0012] Preferably, the pressure of the constant-pressure injection of the binder liquid is 0.2-1 MPa.

[0013] Preferably, the temperature at which the urease bacteria induces the mineralization reaction is 15-30°C.

[0014] The present invention also provides a device for repairing and regenerating aquiclude in coal mines, including a bacterial liquid cultivation system;

[0015] Cement preparation system;

[0016] A bacterial liquid injection system; the bacterial liquid injection system is connected to the bacterial liquid cultivation system;

[0017] A cementing liquid injection system; the cementing liquid injection system is connected to the cementing liquid preparation system;

[0018] Cementing system; the cementing system is connected to the bacterial liquid injection system and the cementing liquid injection system respectively;

[0019] Reactant monitoring system;

[0020] Parameter control system; the parameter control system is respectively connected to the bacterial liquid cultivation system, the cementing liquid preparation system, the bacterial liquid injection system, the cementing liquid injection system and the reactant monitoring system.

[0021] Preferably, the bacterial liquid injection system includes a first purification device, a constant pressure and constant flow plunger pump for bacteria injection connected to the first purification device, and a high temperature sterilization box accommodating the first purification device and the constant pressure and constant flow plunger pump for bacteria injection.

[0022] Preferably, the cementing liquid injection system includes a second purification device, a constant-pressure and constant-flow plunger pump connected to the second purification device, and a one-way valve for preventing the cementing liquid from flowing back connected to the constant-pressure and constant-flow plunger pump.

[0023] Preferably, the cementing system includes a first cementing system and a second cementing system; the first cementing system includes a first vertical borehole, a first casing arranged in the first vertical borehole, a first high-strength water-resistant cement slurry filled between the first vertical borehole and the first casing, a first horizontal borehole connected to the first casing, and a first flower pipe arranged in the first horizontal borehole; the structure of the second cementing system is the same as that of the first cementing system.

[0024] The present invention also provides a method for repairing and reconstructing a coal mine water-proof layer using the device described in the above scheme, comprising the following steps:

[0025] (A) Arrange the cementing system from the surface to the aquiclude;

[0026] (B) using the parameter control system to control the parameters, injecting the bacterial solution cultivated in the bacterial solution cultivation system into the aquiclude at a constant pressure through the bacterial solution injection system, monitoring the distribution range of the bacterial solution in the aquiclude through the reactant monitoring system, and stopping the injection after the bacterial solution fills the cracks in the aquiclude; injecting the cementing solution prepared by the cementing solution preparation system into the aquiclude at a constant pressure through the cementing solution injection system to carry out urease bacteria-induced mineralization reaction with the bacterial solution;

[0027] (C) Repeat step (B) until the cracks in the aquiclude are completely filled with calcium carbonate.

[0028] The present invention provides a method for repairing and reconstructing the aquiclude of a coal mine. The present invention is based on the microbial induced calcium carbonate deposition (MICP) technology, and repairs the aquiclude of a coal mine by grouting the aquiclude from the ground. The microbial solution and the cementing liquid are efficiently, accurately and conveniently injected, and can be injected into the fine pores of the rock mass. It is green and environmentally friendly, and the reactants at different levels of the aquiclude are monitored in real time. The injection parameters are regulated to improve the reaction efficiency of the microbial solution and the cementing liquid, and the water-conducting cracks in the aquiclude are blocked to achieve efficient repair of the aquiclude, thereby preventing the loss of water resources in the aquifer. In addition, the method provided by the present invention is low-cost, has significant economic and ecological benefits, and has the potential for large-scale application.

[0029] The present invention also provides a device for repairing and regenerating aquicludes in coal mines. The device provided by the present invention efficiently, accurately and conveniently injects microbial solution and cementing liquid into the aquicludes through various independent systems on the ground, and can inject into the fine pores of the rock mass, which is green and environmentally friendly. At the same time, the underground reactants are monitored in real time, and the injection parameters are adjusted to achieve efficient repair of the aquicludes, thereby preventing the loss of water resources in the aquifer.

[0030] The present invention also provides a method for repairing and reconstructing a coal mine water-proof layer using the device described in the above scheme. The method provided by the present invention is easy to operate, has good feasibility and stability, and has good prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 A schematic diagram of the structure of the device for repairing and regenerating aquiclude in a coal mine provided by the present invention;

[0033] Figure numerals: 1 is a bacterial liquid cultivation system, 2 is a cementing liquid preparation system, 3 is a bacterial liquid injection system, 4 is a cementing liquid injection system, 5 is a cementing system, 6 is a reactant monitoring system, 7 is a parameter control system, and 8 is a water-proof layer;

[0034] 1-1 is a pH value monitoring and regulating device, 1-2 is a temperature regulating device, 1-3 is a bacterial strain activity monitoring device, 1-4 is a bacterial strain supply device, 1-5 is a bacterial strain cultivation device, and 1-6 is a nutrient solution supply device;

[0035] 2-1 is a calcium source supply device, 2-2 is a pure water supply device, 2-3 is a urea supply device, 2-4 is a calcium source solution preparation device, 2-5 is a cementing solution preparation device, and 2-6 is a urea solution preparation device;

[0036] 3-1 is the first purification device, 3-2 is the first valve, 3-3 is a constant pressure and constant flow plunger pump for bacteria injection, 3-4 is the first pressure gauge, 3-5 is the first flow meter, 3-6 is the first waste liquid storage device, 3-7 is a high temperature sterilization box, 3-8 is the second valve, and 3-9 is a one-way valve for anti-bacteria liquid reflux;

[0037] 4-1 is a constant pressure and constant flow plunger pump, 4-2 is a one-way valve to prevent cementing liquid from flowing back, 4-3 is a second purification device, 4-4 is a third valve, 4-5 is a second pressure gauge, 4-6 is a second flow meter, 4-7 is a fourth valve, and 4-8 is a second waste liquid storage device;

[0038] 5-1 is the first casing, 5-2 is the first high-strength resistant water-resistant cement slurry, 5-3 is the first vertical borehole, 5-4 is the second casing, 5-5 is the second vertical borehole, 5-6 is the second high-strength resistant water-resistant cement slurry, 5-7 is the first horizontal borehole, and 5-8 is the second horizontal borehole;

[0039] 6-1 is a monitoring device, 6-2 is a first signal transmission line, 7-1 is a computer, and 7-2 is a second signal transmission line. DETAILED DESCRIPTION

[0040] The present invention provides a method for repairing and regenerating a coal mine water-proof layer, comprising the following steps:

[0041] (1) injecting the bacterial solution into the aquiclude at a constant pressure until the bacterial solution fills the cracks in the aquiclude; injecting the cementing solution into the aquiclude at a constant pressure to carry out a urease-induced mineralization reaction with the bacterial solution;

[0042] (2) Repeat step (1) for more than one time until the cracks in the aquiclude are completely filled with calcium carbonate; the bacterial solution is urease bacteria; the OD600 of the urease bacteria is 1.0 to 2.5; and the cementing solution includes urea and a calcium source.

[0043] In the present invention, the molar ratio of urea to calcium source in the binder is preferably 0.5 to 1.5:1, more preferably 0.8 to 1.2:1, and further preferably 1:1.

[0044] In the present invention, the calcium source in the binder preferably includes one or more of calcium chloride, calcium acetate and calcium nitrate.

[0045] In the present invention, the concentration of urea in the binder solution is preferably 0.5 to 2 mol / L, more preferably 0.7 to 1.7 mol / L, and further preferably 1.0 to 1.4 mol / L.

[0046] In the present invention, the solvent in the binder preferably includes water.

[0047] In the present invention, the single injection volume ratio of the binder solution to the bacterial solution is preferably 2-3:1, more preferably 2.2-2.8:1, and further preferably 2.4-2.6:1.

[0048] In the present invention, the pressure of the bacterial solution constant pressure injection is preferably 0.2-1 MPa, more preferably 0.4-0.8 MPa, and further preferably 0.6 MPa.

[0049] In the present invention, the pressure of the constant-pressure injection of the binder liquid is preferably 0.2-1 MPa, more preferably 0.4-0.8 MPa, and further preferably 0.6 MPa.

[0050] In the present invention, the temperature for the urease bacteria to induce the mineralization reaction is preferably 15 to 30°C, more preferably 20 to 25°C.

[0051] In the present invention, the number of times the urease bacteria induces the mineralization reaction is preferably 2 times or more, more preferably 4 times or more, and further preferably 10 times or more.

[0052] The present invention also provides a device for repairing and regenerating aquiclude in a coal mine, comprising a bacterial liquid cultivation system 1;

[0053] Binder preparation system 2;

[0054] A bacterial liquid injection system 3; the bacterial liquid injection system 3 is connected to the bacterial liquid cultivation system 1;

[0055] A cementing liquid injection system 4; the cementing liquid injection system 4 is connected to the cementing liquid preparation system 2;

[0056] Cementing system 5; the cementing system 5 is connected to the bacterial liquid injection system 3 and the cementing liquid injection system 4 respectively;

[0057] Reactant monitoring system 6;

[0058] Parameter control system 7; the parameter control system 7 is connected to the bacterial liquid cultivation system 1, the cementing liquid preparation system 2, the bacterial liquid injection system 3, the cementing liquid injection system 4 and the reactant monitoring system 6 respectively.

[0059] The device for repairing and regenerating coal mine waterproofing layers provided by the present invention includes a bacterial liquid cultivation system 1; the bacterial liquid cultivation system 1 preferably includes a bacterial strain cultivation device 1-5, a pH value monitoring and adjustment device 1-1 connected to the bacterial strain cultivation device 1-5, a temperature adjustment device 1-2, a bacterial strain activity monitoring device 1-3, a bacterial strain supply device 1-4 and a nutrient solution supply device 1-6.

[0060] The present invention controls the strain supply device 1-4 and the nutrient solution supply device 1-6 to inject the strains and the nutrient solution into the strain cultivation device 1-5, and regulates the cultivation of suitable strain activity through the pH value monitoring and adjustment device 1-1, the temperature adjustment device 1-2, and the strain activity monitoring device 1-3.

[0061] The device for repairing and regenerating coal mine waterproofing layer provided by the present invention includes a binder liquid preparation system 2; the binder liquid preparation system 2 preferably includes a calcium source supply device 2-1, a calcium source solution preparation device 2-4 connected to the calcium source supply device 2-1, a urea supply device 2-3, a urea solution preparation device 2-6 connected to the urea supply device 2-3, a pure water supply device 2-2 connected to the calcium source solution preparation device 2-4 and the urea solution preparation device 2-6, and a binder liquid preparation device 2-5 connected to the calcium source solution preparation device 2-4 and the urea solution preparation device 2-6.

[0062] The present invention controls the pure water supply device 2-2 and the calcium source supply device 2-1 to inject the calcium source and pure water into the calcium source solution preparation device 2-4, controls the pure water supply device 2-2 and the urea supply device 2-3 to inject urea and pure water into the urea solution preparation device 2-6, and controls the calcium source solution preparation device 2-4 and the urea solution preparation device 2-6 to inject the calcium source solution and urea solution into the binder preparation device 2-5 to prepare the binder.

[0063] The device for repairing and regenerating the coal mine waterproofing layer provided by the present invention includes a bacterial liquid injection system 3; the bacterial liquid injection system 3 preferably includes a first purification device 3-1, a constant pressure and constant flow plunger pump 3-3 dedicated to bacteria injection connected to the first purification device 3-1, and a high-temperature sterilization box 3-7 that accommodates the first purification device 3-1 and the constant pressure and constant flow plunger pump 3-3 dedicated to bacteria injection.

[0064] In the present invention, the first purification device 3-1 is preferably connected to the constant pressure and constant flow plunger pump 3-3 dedicated for bacteria injection through a first valve 3-2.

[0065] In the present invention, the internal material of the constant pressure and constant flow plunger pump 3-3 for bacteria injection is a corrosion-resistant material with good biocompatibility; the corrosion-resistant material with good biocompatibility is preferably a titanium-plated material or a titanium alloy.

[0066] In the present invention, the pumping pressure of the constant pressure and constant flow plunger pump 3-3 specially used for bacteria injection is preferably always higher than the original rock stress of the aquiclude, that is, p1>max(σ1, σ2, σ3), wherein: p1 is the injection pressure, in MPa, σ1, σ2, σ3 represent the principal stresses of the coal seam in the axial, maximum horizontal and minimum horizontal directions, in MPa respectively.

[0067] In the present invention, the bacterial liquid injection system 3 preferably also includes a bacterial liquid reflux prevention check valve 3-9; the bacterial injection-specific constant pressure and constant flow plunger pump 3-3 is preferably connected to the bacterial liquid reflux prevention check valve 3-9 through a first pressure gauge 3-4 and a first flow meter 3-5.

[0068] In the present invention, the internal material of the antibacterial liquid reflux one-way valve 3-9 is a corrosion-resistant material with good biocompatibility; the corrosion-resistant material with good biocompatibility is preferably a titanium-plated material or a titanium alloy.

[0069] In the present invention, the bacterial liquid injection system 3 preferably also includes a first waste liquid storage device 3-6; the constant pressure and constant flow plunger pump 3-3 dedicated to bacterial injection is preferably connected to the first waste liquid storage device 3-6 through a first pressure gauge 3-4 and a first flow meter 3-5, and is more preferably connected to the first waste liquid storage device 3-6 through a first pressure gauge 3-4, a first flow meter 3-5 and a second valve 3-8.

[0070] In the present invention, the temperature range of the high temperature sterilization box 3-7 is preferably 80-100° C., more preferably 90-95° C. The present invention utilizes the high temperature sterilization box 3-7 to accommodate other components of the bacterial liquid injection system 3 except the bacterial liquid backflow prevention check valve 3-9.

[0071] In the present invention, the bacterial culture device 1 - 5 in the bacterial liquid cultivation system 1 is preferably connected to the bacterial injection-specific constant pressure and constant flow plunger pump 3 - 3 in the bacterial liquid injection system 3 .

[0072] The present invention utilizes a high-temperature sterilization box 3-7 to sterilize the first purification device 3-1, the first valve 3-2, the constant pressure and constant flow plunger pump 3-3 for bacteria injection, the first pressure gauge 3-4, the first flow meter 3-5, the first waste liquid storage device 3-6 and the second valve 3-8, and then utilizes the constant pressure and constant flow plunger pump 3-3 for bacteria injection to pump the bacterial liquid into the first sleeve 5-1 through the first valve 3-2, the first pressure gauge 3-4, the first flow meter 3-5 and the anti-bacterial liquid reflux check valve 3-9. After the pumping is completed, the high-temperature sterilization box 3-7 is used to sterilize the system again, and the constant pressure and constant flow plunger pump 3-3 for bacteria injection, the first valve 3-2, the first pressure gauge 3-4 and the first flow meter 3-5 are purified by the first purification device 3-1, and the purified waste liquid is discharged into the first waste liquid storage device 3-6.

[0073] The device for repairing and regenerating coal mine waterproofing layers provided by the present invention includes a binder injection system 4; the binder injection system 4 preferably includes a second purification device 4-3, a constant pressure and constant flow plunger pump 4-1 connected to the second purification device 4-3, and a binder backflow prevention one-way valve 4-2 connected to the constant pressure and constant flow plunger pump 4-1.

[0074] In the present invention, the internal material of the constant-pressure constant-flow plunger pump 4 - 1 is preferably a corrosion-resistant material; the corrosion-resistant material is preferably a titanium-plated material or a titanium alloy.

[0075] In the present invention, the pumping pressure of the constant pressure and constant flow plunger pump 4-1 is preferably always higher than the original rock stress of the aquifer, that is, p1>max(σ1, σ2, σ3), wherein: p1 is the injection pressure, in MPa, σ1, σ2, σ3 represent the principal stresses in three directions of the coal seam, in MPa respectively.

[0076] In the present invention, the second purification device 4-3 is preferably connected to the constant pressure and constant flow plunger pump 4-1 through a third valve 4-4.

[0077] In the present invention, the constant pressure constant flow plunger pump 4-1 is preferably connected to the second waste liquid storage device 4-8 through a second pressure gauge 4-5 and a second flow meter 4-6, and more preferably connected to the second waste liquid storage device 4-8 through a second pressure gauge 4-5, a second flow meter 4-6 and a fourth valve 4-7.

[0078] In the present invention, the constant pressure and constant flow plunger pump 4-1 is preferably connected to the anti-backflow check valve 4-2 of the cementing liquid through a second pressure gauge 4-5 and a second flow meter 4-6.

[0079] In the present invention, the internal material of the anti-backflow check valve 4-2 is preferably a corrosion-resistant material; the corrosion-resistant material is preferably a titanium-plated material or a titanium alloy.

[0080] In the present invention, the cementing liquid preparation device 2 - 5 in the cementing liquid preparation system 2 is preferably connected to the constant pressure and constant flow plunger pump 4 - 1 in the cementing liquid injection system 4 .

[0081] The present invention uses a constant pressure and constant flow plunger pump 4-1 to pump the binder liquid into the second casing 5-5 through the third valve 4-4, the second pressure gauge 4-5, the second flow meter 4-6 and the binder liquid backflow prevention one-way valve 4-2. After the pumping is completed, the constant pressure and constant flow plunger pump 4-1, the third valve 4-4, the second pressure gauge 4-5, the second flow meter 4-6 and the fourth valve 4-7 are purified by the second purification device 4-3, and the purified waste liquid is discharged into the second waste liquid storage device 4-8.

[0082] The device for repairing and regenerating the coal mine waterproofing layer provided by the present invention includes a cementing system 5; the cementing system 5 preferably includes a first cementing system 51 and a second cementing system 52; the first cementing system 51 preferably includes a first vertical borehole 5-3, a first casing 5-1 arranged in the first vertical borehole 5-3, a first high-strength water-resistant cement slurry 5-2 filled between the first vertical borehole 5-3 and the first casing 5-1, a first horizontal borehole 5-7 connected to the first casing 5-1, and a first flower pipe arranged in the first horizontal borehole 5-7.

[0083] In the present invention, the diameter of the first vertical drill hole 5 - 3 is preferably 150 to 200 mm, more preferably 160 to 190 mm, and further preferably 170 to 180 mm.

[0084] In the present invention, the diameter of the first sleeve 5 - 1 is preferably 100 to 130 mm, more preferably 110 to 120 mm, and further preferably 115 mm.

[0085] In the present invention, the strength of the first high-strength resistant water-resistant cement slurry 5-2 is preferably above 62.5 MPa, more preferably 62.5 to 90 MPa, and further preferably 70 to 80 MPa; the first high-strength resistant water-resistant cement slurry 5-2 is preferably magnesium oxychloride cement.

[0086] In the present invention, the diameter of the first flower tube is preferably 60-76 mm, more preferably 65-72 mm, and the pore diameter is preferably 8-12 mm, more preferably 9-10 mm.

[0087] In the present invention, the first casing 5 - 1 in the first cementing system 51 is preferably connected to the bacterial solution backflow prevention check valve 3 - 9 in the bacterial solution injection system 3 .

[0088] In the present invention, the structure of the second cementing system 52 is preferably the same as that of the first cementing system 51; the second cementing system 52 preferably includes a second vertical borehole 5-4, a second casing 5-5 arranged in the second vertical borehole 5-4, a second high-strength water-resistant cement slurry 5-6 filled between the second vertical borehole 5-4 and the second casing 5-5, a second horizontal borehole 5-8 connected to the second casing 5-5, and a second flower pipe arranged in the second horizontal borehole 5-8.

[0089] In the present invention, the diameter of the second vertical borehole 5-4 is preferably the same as that of the first vertical borehole 5-3, which will not be described in detail herein.

[0090] In the present invention, the diameter of the second sleeve 5-5 is preferably the same as that of the first sleeve 5-1, which will not be described in detail herein.

[0091] In the present invention, the strength and type of the second high-strength water-resistant cement slurry 5-6 are preferably the same as those of the first high-strength water-resistant cement slurry 5-2, and will not be described in detail herein.

[0092] In the present invention, the diameter and aperture of the second floral tube are preferably consistent with those of the first floral tube, which will not be described in detail herein.

[0093] In the present invention, the second casing 5 - 5 in the second cementing system 52 is preferably connected to the cementing liquid backflow prevention one-way valve 4 - 2 in the cementing liquid injection system 4 .

[0094] The device for repairing and regenerating aquiclude of a coal mine provided by the present invention comprises a reactant monitoring system 6; the reactant monitoring system 6 preferably comprises a monitoring device 6-1 and a first signal transmission line 6-2 connected to the monitoring device 6-1. When the device provided by the present invention is working, the reactant monitoring system 6 is connected to the rock layer of the coal mine aquiclude through the first signal transmission line 6-2 to monitor the reaction of the reactants in the rock layer. The present invention controls the injection amount and injection time of the bacterial liquid and the cementing liquid by monitoring the generation of reactants in different rock layers of the aquiclude.

[0095] The device for repairing and regenerating aquiclude of a coal mine provided by the present invention comprises a parameter control system 7; the parameter control system 7 preferably comprises a computer 7-1 and a second signal transmission line 7-2 connected to the computer 7-1.

[0096] In the present invention, the parameter control system 7 is preferably connected to the bacterial liquid cultivation system 1, the cementing liquid preparation system 2, the bacterial liquid injection system 3, the cementing liquid injection system 4 and the reactant monitoring system 6 respectively through the second signal transmission line 7-2. The present invention controls the parameters of the bacterial liquid cultivation system 1, the cementing liquid preparation system 2, the bacterial liquid injection system 3, the cementing liquid injection system 4, the cementing system 5 and the reactant monitoring system 6 through the data transmitted by the second signal transmission line 7-2. The device structure provided by the present invention is specifically as follows Figure 1 shown.

[0097] The present invention also provides a method for repairing and reconstructing a coal mine water-proof layer using the device described in the above scheme, comprising the following steps:

[0098] (A) arranging a cementing system 5 from the surface to the aquiclude;

[0099] (B) Parameters are adjusted by the parameter control system 7, and the bacterial solution cultivated in the bacterial solution cultivation system 1 is injected into the aquiclude at a constant pressure through the bacterial solution injection system 3, and the distribution range of the bacterial solution in the aquiclude is monitored by the reactant monitoring system 6, and the injection is stopped after the bacterial solution fills the cracks in the aquiclude; the cementing solution prepared by the cementing solution preparation system 2 is injected into the aquiclude at a constant pressure through the cementing solution injection system 4 to carry out urease bacteria-induced mineralization reaction with the bacterial solution;

[0100] (C) Repeat step (B) until the cracks in the aquiclude are completely filled with calcium carbonate.

[0101] In the present invention, the method for repairing and reconstructing the coal mine waterproofing layer using the device described in the above scheme preferably has the same specific parameters as the method for repairing and reconstructing the coal mine waterproofing layer described in the above scheme, and will not be repeated here.

[0102] In the present invention, the incubation temperature is preferably 15 to 30° C., more preferably 20 to 25° C., and further preferably 22° C., and the pH value is preferably 7 to 8, and more preferably 7.5.

[0103] The present invention arranges vertical and horizontal boreholes from the surface to the aquiclude, and uses high-strength water-resistant cement slurry to fill and seal the vertical boreholes. The bacterial solution is injected into the aquiclude from the casing 5-1, and the cementing solution is injected into the aquiclude from the casing 5-2. The cementing solution seeps into the cracks in the aquiclude and reacts with the bacterial solution to produce calcium carbonate, which blocks the cracks and achieves the purpose of repairing and recreating the aquiclude. The bacterial solution and the cementing solution are injected repeatedly until the cracks in the aquiclude are completely filled with calcium carbonate.

[0104] In order to further illustrate the present invention, the scheme of the present invention is described in detail below in conjunction with the accompanying drawings and embodiments, but they should not be understood as limiting the protection scope of the present invention.

[0105] Example 1

[0106] The device for repairing and regenerating the impermeable layer of a coal mine used in this embodiment includes a bacterial liquid cultivation system 1; the bacterial liquid cultivation system 1 includes a bacterial strain cultivation device 1-5, a pH value monitoring and regulating device 1-1, a temperature regulating device 1-2, a bacterial strain activity monitoring device 1-3, a bacterial strain supply device 1-4 and a nutrient solution supply device 1-6 respectively connected to the bacterial strain cultivation device 1-5; by controlling the bacterial strain supply device 1-4 and the nutrient solution supply device 1-6, the bacterial strain and the nutrient solution are injected into the bacterial strain cultivation device 1-5, and the pH value monitoring and regulating device 1-1, the temperature regulating device 1-2, and the bacterial strain activity monitoring device 1-3 are used to regulate and cultivate the appropriate bacterial strain activity;

[0107] The cementing liquid preparation system 2 comprises a calcium source supply device 2-1, a calcium source solution preparation device 2-4 connected to the calcium source supply device 2-1, a urea supply device 2-3, a urea solution preparation device 2-6 connected to the urea supply device 2-3, a pure water supply device 2-2 connected to the calcium source solution preparation device 2-4 and the urea solution preparation device 2-6, and a calcium source solution preparation device 2-4 and a urea solution preparation device 2-6. The cementing liquid preparation device 2-5 is connected; by controlling the pure water supply device 2-2 and the calcium source supply device 2-1, the calcium source and pure water are injected into the calcium source solution preparation device 2-4; by controlling the pure water supply device 2-2 and the urea supply device 2-3, urea and pure water are injected into the urea solution preparation device 2-6; by controlling the calcium source solution preparation device 2-4 and the urea solution preparation device 2-6, the calcium source solution and urea solution are injected into the cementing liquid preparation device 2-5 to prepare the cementing liquid;

[0108] Bacteria liquid injection system 3; the bacteria liquid injection system 3 includes a first purification device 3-1, a constant pressure and constant flow plunger pump 3-3 dedicated to bacteria injection, a first waste liquid storage device 3-6, a high temperature sterilization box 3-7, and a bacteria liquid backflow prevention check valve 3-9; the first purification device 3-1 is connected to the constant pressure and constant flow plunger pump 3-3 dedicated to bacteria injection through a first valve 3-2; the internal material of the constant pressure and constant flow plunger pump 3-3 dedicated to bacteria injection is titanium alloy; the pumping pressure of the constant pressure and constant flow plunger pump 3-3 dedicated to bacteria injection is always higher than the original rock stress of the aquifer; the constant pressure and constant flow plunger pump 3-3 dedicated to bacteria injection is connected to the first pressure gauge 3-4 and the first flow meter 3 -5 and the second valve 3-8 are connected to the first waste liquid storage device 3-6; the constant pressure and constant flow plunger pump 3-3 dedicated to bacteria injection is connected to the anti-bacterial liquid reflux check valve 3-9 through the first pressure gauge 3-4 and the first flow meter 3-5; the internal material of the anti-bacterial liquid reflux check valve 3-9 is titanium alloy; the temperature range of the high-temperature sterilization box 3-7 is 80-100°C, and the high-temperature sterilization box 3-7 accommodates other components in the bacteria liquid injection system 3 except the anti-bacterial liquid reflux check valve 3-9; the bacterial strain cultivation device 1-5 in the bacterial liquid cultivation system 1 is connected to the constant pressure and constant flow plunger pump 3-3 dedicated to bacteria injection in the bacterial liquid injection system 3;

[0109] The bacterial liquid injection system 3 sterilizes the first purification device 3-1, the first valve 3-2, the constant pressure and constant flow plunger pump 3-3 for bacteria injection, the first pressure gauge 3-4, the first flow meter 3-5, the first waste liquid storage device 3-6 and the second valve 3-8 through the high-temperature sterilization box 3-7, and then uses the constant pressure and constant flow plunger pump 3-3 for bacteria injection to pump the bacterial liquid into the first sleeve 5-1 through the first valve 3-2, the first pressure gauge 3-4, the first flow meter 3-5 and the anti-bacterial liquid reflux check valve 3-9. After the pumping is completed, the high-temperature sterilization box 3-7 is used to sterilize the system again, and the constant pressure and constant flow plunger pump 3-3 for bacteria injection, the first valve 3-2, the first pressure gauge 3-4 and the first flow meter 3-5 are purified through the first purification device 3-1, and the purified waste liquid is discharged into the first waste liquid storage device 3-6;

[0110] The cementing liquid injection system 4 comprises a second purification device 4-3, a constant pressure and constant flow plunger pump 4-1, and a one-way valve 4-2 to prevent the backflow of the cementing liquid; the internal material of the constant pressure and constant flow plunger pump 4-1 is titanium alloy; the pumping pressure of the constant pressure and constant flow plunger pump 4-1 is always higher than the original rock stress of the aquifer; the second purification device 4-3 is connected to the constant pressure and constant flow plunger pump 4-1 through a third valve 4-4; the constant pressure and constant flow plunger pump 4-1 is connected to the second waste liquid storage device 4-8 through a second pressure gauge 4-5, a second flow meter 4-6 and a fourth valve 4-7; the constant pressure and constant flow plunger pump 4-1 is connected to the anti-backflow check valve 4-2 through a second pressure gauge 4-5 and a second flow meter 4-6 The first embodiment of the present invention relates to a first embodiment of the present invention which is connected to the first embodiment of the present invention. The first embodiment of the present invention is connected to the first embodiment of the present invention through the first valve 4-4, the second pressure gauge 4-5, the second flow meter 4-6 and the first valve 4-7. The first embodiment of the present invention is connected to the first embodiment of the present invention through the first valve 4-4, the second pressure gauge 4-5, the second flow meter 4-6 and the first valve 4-7. The first embodiment of the present invention is connected to the first embodiment of the present invention through the first valve 4-4, the second pressure gauge 4-5, the second flow meter 4-6 and the first valve 4-7. The second embodiment of the present invention is connected to the first embodiment of the present invention through the first valve 4-4, the second pressure gauge 4-5, the second flow meter 4-6 and the first valve 4-7. The second purification device 4-3 is used to purify the constant pressure constant flow plunger pump 4-1, the third valve 4-4, the second pressure gauge 4-5, the second flow meter 4-6 and the fourth valve 4-7. The purified waste liquid is discharged into the second waste liquid storage device 4-8.

[0111] The cementing system 5 comprises a first cementing system 51 and a second cementing system 52; the first cementing system 51 comprises a first vertical borehole 5-3 (diameter 150 mm), a first casing 5-1 (diameter 100 mm) arranged in the first vertical borehole 5-3, magnesium oxychloride cement (strength 80 MPa) filled between the first vertical borehole 5-3 and the first casing 5-1, a first horizontal borehole 5-7 connected to the first casing 5-1, and a first flower tube (diameter 60 mm, aperture 8 mm) arranged in the first horizontal borehole 5-7; the first casing 5-1 in the first cementing system 51 is connected to the bacterial solution injection system 3 The second cementing system 52 comprises a second vertical borehole 5-4 (200 mm in diameter), a second casing 5-5 (130 mm in diameter) disposed in the second vertical borehole 5-4, magnesium oxychloride cement (80 MPa in strength) filled between the second vertical borehole 5-4 and the second casing 5-5, a second horizontal borehole 5-8 connected to the second casing 5-5, and a second flower tube (76 mm in diameter and 12 mm in aperture) disposed in the second horizontal borehole 5-8; the second casing 5-5 in the second cementing system 52 is connected to the anti-bacterial liquid backflow check valve 4-2 in the cementing liquid injection system 4;

[0112] Reactant monitoring system 6; the reactant monitoring system 6 comprises a monitoring device 6-1 and a first signal transmission line 6-2 connected to the monitoring device 6-1; the reactant monitoring system 6 is connected to the rock layer of the coal mine aquifer through the first signal transmission line 6-2 to monitor the reaction of the reactants in the rock layer; by monitoring the generation of reactants in different rock layers of the aquifer, the injection amount and injection time of the bacterial solution and the cementing solution are controlled;

[0113] Parameter control system 7; the parameter control system 7 includes a computer 7-1 and a second signal transmission line 7-2 connected to the computer 7-1; the parameter control system 7 is connected to the bacterial liquid cultivation system 1, the cementing liquid preparation system 2, the bacterial liquid injection system 3, the cementing liquid injection system 4 and the reactant monitoring system 6 respectively through the second signal transmission line 7-2; the parameters of the bacterial liquid cultivation system 1, the cementing liquid preparation system 2, the bacterial liquid injection system 3, the cementing liquid injection system 4, the cementing system 5 and the reactant monitoring system 6 are controlled by the data transmitted through the second signal transmission line 7-2.

[0114] This embodiment uses the above device to repair and reconstruct the coal mine waterproof layer, specifically including the following steps:

[0115] (A) arranging a cementing system 5 from the surface to the aquiclude;

[0116] (B) Parameters are adjusted by the parameter control system 7, and the urease bacteria solution cultivated at 20° C. in the solution cultivation system 1 is injected into the aquiclude at a constant pressure of 0.2 MPa through the solution injection system 3, and the distribution range of the urease bacteria solution in the aquiclude is monitored by the reactant monitoring system 6, and the injection is stopped after the urease bacteria solution fills the cracks in the aquiclude;

[0117] Urea, calcium chloride and water are injected into the aquiclude by using a cementing solution prepared by a cementing solution preparation system 2 through a cementing solution injection system 4 at a constant pressure of 1 MPa, wherein the single injection volume ratio of the cementing solution to the urease bacteria solution is 2:1, and a urease bacteria-induced mineralization reaction is carried out with the urease bacteria solution;

[0118] (C) Repeat step (B) until the cracks in the aquiclude are completely filled with calcium carbonate.

[0119] Table 1 Comparison table of preparation parameters of Examples 1 to 4

[0120] index Example 1 Example 2 Example 3 Example 4 OD600 of urease-producing bacteria 1.0 1.5 2.0 2.5 Molar ratio of urea to calcium source in the cementing fluid 0.5:1 1:1 1:1 1.5:1 Temperature of urease-induced mineralization reaction / ℃ 15 20 25 30 pH value of cultivation 7 7.5 7.5 8 Urea concentration in cementing fluid / mol / L 0.5 1 1.5 2

[0121] The aquiclude rock in Example 1 of the present invention was sampled and tested for permeability under original rock stress conditions. The results showed that the permeability of the rock dropped from 100 md before repair to 10 md after repair, with a permeability attenuation of 90%, achieving the effect of repairing the cracks in the aquiclude.

[0122] It can be seen from the above embodiments that the method provided by the present invention improves the reaction efficiency of the microbial solution and the cementing liquid, blocks the water-conducting cracks in the aquiclude, achieves efficient repair of the aquiclude, and thus prevents the loss of water resources in the aquifer.

[0123] Although the above embodiment describes the present invention in detail, it is only a part of the embodiments of the present invention, not all of the embodiments. Other embodiments can be obtained based on this embodiment without creativity, and these embodiments all fall within the protection scope of the present invention.

Claims

1. A method for repairing and regenerating aquiclude in a coal mine, characterized in that: The following steps are involved: (1) injecting the bacterial solution into the aquiclude at a constant pressure until the bacterial solution fills the cracks in the aquiclude; injecting the cementing solution into the aquiclude at a constant pressure to carry out a urease-induced mineralization reaction with the bacterial solution; (2) Repeat step (1) one or more times until the cracks in the aquiclude are completely filled with calcium carbonate; The bacterial solution is urease bacteria; the OD600 of the urease bacteria is 1.0 to 2.5; The cementing fluid includes urea and a calcium source.

2. The method according to claim 1, characterized in that The molar ratio of urea to calcium source in the cementing fluid is 0.5 to 1.5:1; The concentration of urea in the cementing fluid is 0.5-2 mol / L; The single injection volume ratio of the cementing liquid to the bacterial liquid is 2 to 3:

1.

3. The method according to claim 1 or 2, characterized in that: The pressure of the bacterial solution constant pressure injection is 0.2-1 MPa.

4. The method according to claim 1 or 2, characterized in that: The pressure of the constant pressure injection of the cementing liquid is 0.2-1 MPa.

5. The method according to claim 1, characterized in that The temperature for the urease bacteria to induce the mineralization reaction is 15-30°C.

6. A device for repairing and regenerating aquiclude in coal mines, characterized in that: It comprises a bacterial liquid cultivation system (1); Binder preparation system (2); A bacterial liquid injection system (3); the bacterial liquid injection system (3) is connected to the bacterial liquid cultivation system (1); A cementing liquid injection system (4); the cementing liquid injection system (4) is connected to the cementing liquid preparation system (2); A cementing system (5); the cementing system (5) is connected to the bacterial liquid injection system (3) and the cementing liquid injection system (4) respectively; Reactant monitoring system (6); A parameter control system (7); the parameter control system (7) is respectively connected to the bacterial liquid cultivation system (1), the cementing liquid preparation system (2), the bacterial liquid injection system (3), the cementing liquid injection system (4) and the reactant monitoring system (6).

7. The device according to claim 6, characterized in that The bacterial liquid injection system (3) comprises a first purification device (3-1), a constant pressure and constant flow plunger pump (3-3) dedicated for bacterial injection connected to the first purification device (3-1), and a high temperature sterilization box (3-7) accommodating the first purification device (3-1) and the constant pressure and constant flow plunger pump (3-3) dedicated for bacterial injection.

8. The device according to claim 6 or 7, characterized in that The cementing liquid injection system (4) comprises a second purification device (4-3), a constant pressure and constant flow plunger pump (4-1) connected to the second purification device (4-3), and a cementing liquid backflow prevention one-way valve (4-2) connected to the constant pressure and constant flow plunger pump (4-1).

9. The device according to claim 6, characterized in that The cementing system (5) comprises a first cementing system (51) and a second cementing system (52); The first cementing system (51) comprises a first vertical borehole (5-3), a first casing (5-1) arranged in the first vertical borehole (5-3), a first high-strength water-resistant cement slurry (5-2) filled between the first vertical borehole (5-3) and the first casing (5-1), a first horizontal borehole (5-7) connected to the first casing (5-1), and a first flower pipe arranged in the first horizontal borehole (5-7); The structure of the second cementing system (52) is the same as that of the first cementing system (51).

10. A method for repairing and reconstructing a coal mine waterproof layer using the device according to any one of claims 6 to 9, characterized in that: The following steps are involved: (A) Arranging a cementing system (5) from the surface to the aquiclude; (B) Parameters are adjusted by using a parameter control system (7), and the bacterial solution cultivated in the bacterial solution cultivation system (1) is injected into the aquiclude at a constant pressure through a bacterial solution injection system (3), and the distribution range of the bacterial solution in the aquiclude is monitored by a reactant monitoring system (6), and the injection is stopped after the bacterial solution fills the cracks in the aquiclude; the cementing solution prepared by the cementing solution preparation system (2) is injected into the aquiclude at a constant pressure through a cementing solution injection system (4) to carry out a urease-induced mineralization reaction with the bacterial solution; (C) Repeat step (B) until the cracks in the aquiclude are completely filled with calcium carbonate.

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