CN115012933B - Zonal grouting construction method for stoping fault waterproof coal pillar - Google Patents
Zonal grouting construction method for stoping fault waterproof coal pillar Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- 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
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP 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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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F16/00—Drainage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The application provides a zonal grouting construction method for a stoping fault waterproof coal pillar. The method comprises the following steps: dividing the area influencing the exploitation of the fault waterproof coal pillar into a fault coal pillar grouting area, a fault coal pillar top plate grouting reinforcement area, a working face bottom plate grouting reinforcement area and a fault zone grouting reinforcement area; carrying out a first water pumping test on the bottom plate and the fault zone, determining the water richness of the bottom plate and the fault zone, carrying out first water drainage on the bottom plate and the fault zone until the unit water inflow amount reaches a preset water inflow range, and stopping the first water drainage; grouting reinforcement is respectively carried out on a bottom plate grouting reinforcement area, a fault zone grouting reinforcement area, a fault coal pillar grouting area and a fault coal pillar top plate grouting reinforcement area of the working face; and carrying out a second water pumping test on the bottom plate and the fault zone, determining the water enrichment of the bottom plate and the fault zone, carrying out second water drainage on the bottom plate and the fault zone until the unit water inflow amount is less than or equal to a preset water inflow threshold value, and carrying out fault waterproof coal pillar recovery mining on the working face.
Description
Technical Field
The application relates to the technical field of coal mine safety mining, in particular to a zonal grouting construction method for a stoping fault waterproof coal pillar.
Background
Along with the economic development, the demand on energy sources such as coal is increasingly large, shallow resources are about to be exhausted, deep coal is affected by aquifers such as bottom plate Ordovician ash water, particularly waterproof coal pillars need to be reserved under the fault passing condition, and the recovery rate of the coal resources is reduced. The width of the waterproof coal pillar reserved can be shortened through grouting reinforcement, and the coal extraction rate is improved to a certain extent.
At present, the waterproof coal pillar recovery rate of the fault is improved mainly by grouting and modifying a water-resisting layer on a bottom plate, but the resource recovery rate is still low, and the water in the water-containing layer of the bottom plate can gush into a working surface through the leading-in waterproof coal pillar of the fault or a top plate of the coal pillar to cause a gushing water accident.
Therefore, it is necessary to improve the recovery rate of the fault waterproof coal pillar for comprehensive grouting to ensure safe mining.
Disclosure of Invention
The application aims to provide a zonal grouting construction method for a stoping fault waterproof coal pillar, which aims to solve or relieve the problems in the prior art.
In order to achieve the above purpose, the present application provides the following technical solutions:
the application provides a zonal grouting construction method for a mining fault waterproof coal pillar, which comprises the following steps: step S101, dividing the area influencing the exploitation of the fault waterproof coal pillar into a fault coal pillar grouting area, a fault coal pillar top plate grouting reinforcement area, a working face bottom plate grouting reinforcement area and a fault zone grouting reinforcement area; step S102, carrying out a first water pumping test on a bottom plate and a fault zone to determine the water richness of the bottom plate and the fault zone, carrying out first water drainage on the bottom plate and the fault zone until the unit water inflow amount reaches a preset water inflow range, and stopping the first water drainage; step S103, grouting reinforcement is respectively carried out on the working face bottom plate grouting reinforcement area, the fault zone grouting reinforcement area, the fault coal pillar grouting area and the fault coal pillar top plate grouting reinforcement area; and S104, performing a second water pumping test on the bottom plate and the fault zone, determining the water-rich property of the bottom plate and the fault zone, performing second water drainage on the bottom plate and the fault zone until the unit water inflow is less than or equal to a preset water inflow threshold value, and performing fault waterproof coal pillar recovery mining on the working face.
Preferably, before step S101, the method for performing zonal grouting on the mining fault waterproof coal pillar further includes: determining a water inrush path of a bottom plate aquifer based on a fault waterproof coal pillar recovery rate exploitation numerical test; the water inrush path comprises a bottom plate water inrush path, a fault zone connecting waterproof coal pillar water inrush path and a fault zone connecting coal pillar top plate water inrush path.
Preferably, in step S101, according to the reserved spatial position relationship between the water inrush path, the working face and the fault waterproof coal pillar, the area affecting the exploitation of the fault waterproof coal pillar is divided into a fault coal pillar grouting area, a fault coal pillar top plate grouting reinforcement area, a working face bottom plate grouting reinforcement area and a fault zone grouting reinforcement area.
Preferably, in step S103, grouting holes are drilled in the grouting reinforcement area of the bottom plate of the working surface, and grouting reinforcement is performed to increase the thickness of the water-resisting layer of the bottom plate and to plug the water inrush path of the bottom plate; grouting holes are formed in the fault zone grouting reinforcement area for grouting reinforcement so as to fill fracture of a fractured rock body of the fault zone and plug a fault zone part in a fault zone connection waterproof coal pillar water inrush path and a fault zone connection coal pillar top plate water inrush path; grouting holes are formed in the fault coal pillar grouting area for grouting reinforcement, and the blocking fault zone is connected with a waterproof coal pillar water inrush path; and (3) grouting holes are formed in the grouting reinforcement area of the top plate of the fault coal pillar for grouting reinforcement, and the blocking fault zone is connected with a water inrush path of the top plate of the coal pillar.
Preferably, the grouting reinforcement area of the bottom plate of the working face, the grouting reinforcement area of the fault zone and the grouting reinforcement area of the top plate of the fault coal pillar are reinforced by grouting with a first grouting material, and the grouting pressure is at least 1MPa greater than the pressure of a water-bearing stratum; the first grouting material is cement paste or cement paste doped with fly ash, and the water-cement ratio in the cement paste doped with fly ash is 0.5-0.7.
Preferably, the fault coal pillar grouting area is subjected to grouting reinforcement by adopting a second grouting material, and the grouting pressure is 1-2 MPa; wherein the slurry ratio of the second grouting material is 0.5 to 0.7.
Preferably, step S102 specifically includes: performing hydrogeological drilling on the bottom plate grouting reinforcement area and the fault zone grouting reinforcement area of the working face so as to respectively perform a first water pumping test on the bottom plate and the fault zone and determine the water-rich property of the bottom plate and the fault zone; and then, draining water for the first time on the bottom plate and the fault zone according to the water inflow amount of the drilled hole until the unit water inflow amount reaches a preset water inflow range, and stopping draining water for the first time.
Preferably, the number of the hydrogeological boreholes in the bottom plate is 3-6, and the length of the hydrogeological boreholes in the bottom plate is determined according to the vertical distance between the bottom plate and the aquifer; and the number of the hydrogeological drill holes in the fault zone is 2-4, and the length of the hydrogeological drill holes in the fault zone is determined according to the reserved width of the coal pillar and the width of the fault zone.
Preferably, the preset water inrush range is (0.1, 1) < L/(s.m), and the preset water inrush threshold value is 0.1 < L/(s.m).
Has the advantages that:
according to the sectional grouting construction technology for the stoping fault waterproof coal pillar, firstly, the area influencing the mining of the fault waterproof coal pillar is divided into a fault coal pillar grouting area, a fault coal pillar top plate grouting reinforcement area, a working face bottom plate grouting reinforcement area and a fault zone grouting reinforcement area; secondly, carrying out a first water pumping test on the bottom plate and the fault zone, determining the water richness of the bottom plate and the fault zone, carrying out first water drainage on the bottom plate and the fault zone until the unit water inflow amount reaches a preset water inflow range, and stopping the first water drainage; then, grouting reinforcement is respectively carried out on a bottom plate grouting reinforcement area, a fault zone grouting reinforcement area, a fault coal pillar grouting area and a fault coal pillar top plate grouting reinforcement area of the working face; and finally, carrying out a second water pumping test on the bottom plate and the fault zone, determining the water-rich property of the bottom plate and the fault zone, carrying out second water drainage on the bottom plate and the fault zone until the unit water inflow amount reaches a preset water inflow threshold value, and carrying out fault waterproof coal pillar recovery mining on the working face. Therefore, through carrying out detailed grouting partition division on the recovery area of the fault waterproof coal pillar, firstly draining water on the bottom plate and the fault zone, and then carrying out partition grouting according to the divided grouting partition, the problem of water inrush during recovery of the fault waterproof coal pillar is effectively solved, the recovery treatment of the fault waterproof coal pillar is more comprehensive and scientific, and the recovery rate of the fault waterproof coal pillar is effectively improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application. Wherein:
fig. 1 is a schematic flow chart of a zonal grouting construction method for a mining fault waterproof coal pillar according to some embodiments of the present application;
FIG. 2 is a schematic illustration of a surge path for the presence of a fault water-repellent coal pillar provided in accordance with some embodiments of the present application;
FIG. 3 is a schematic illustration of hydrogeological drilling of a coal pillar bedplate grouting reinforcement area and a fault zone grouting reinforcement area provided in accordance with some embodiments of the present application;
fig. 4 is a schematic diagram of grouting a borehole in a fault coal pillar grouting area, a fault coal pillar roof grouting reinforcement area, a face floor grouting reinforcement area, and a fault zone grouting reinforcement area provided according to some embodiments of the present application.
Detailed Description
The present application will be described in detail below with reference to the embodiments with reference to the attached drawings. The various examples are provided by way of explanation of the application and are not limiting of the application. In fact, it will be apparent to those skilled in the art that modifications and variations can be made in the present application without departing from the scope or spirit of the application. For instance, features illustrated or described as part of one embodiment, can be used with another embodiment to yield a still further embodiment. It is therefore intended that the present application cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.
As shown in fig. 1 and 2, the zonal grouting construction method for the mining fault waterproof coal pillar comprises the following steps:
step S101, dividing the area influencing the exploitation of the fault waterproof coal pillar into a fault coal pillar grouting area, a fault coal pillar top plate grouting reinforcement area, a working face bottom plate grouting reinforcement area and a fault zone grouting reinforcement area;
in the method, before the area influencing the exploitation of the fault waterproof coal pillar is divided, the area influencing the exploitation of the fault waterproof coal pillar is divided according to the water inrush path of the area influencing the exploitation of the fault waterproof coal pillar. Namely, through the evolution analysis of the plastic zone in the process of extracting the fault waterproof coal pillar, water inrush channels of the bottom plate water-bearing layer communicated with the plastic zone are found, and the areas influencing the exploitation of the fault waterproof coal pillar are divided according to the water inrush channels.
Specifically, determining a water inrush path of a floor aquifer based on a fault waterproof coal pillar recovery rate exploitation numerical test; the water inrush path comprises a bottom plate water inrush path, a fault zone connecting waterproof coal pillar water inrush path and a fault zone connecting coal pillar top plate water inrush path. The fault waterproof coal pillar recovery rate exploitation numerical test mainly comprises the steps of establishing a fault waterproof coal pillar evolution model through engineering geological parameters (geostress, a rock pillar diagram, a floor aquifer and a working face exploitation geometric parameter) of a working face and rock mechanics parameters (coal seam and top floor rock mechanics parameters such as uniaxial compressive strength, elastic modulus, poisson ratio, cohesive force and internal friction angle), carrying out analog calculation on fault waterproof coal pillar recovery based on the fault waterproof coal pillar evolution model, determining the evolution process of a plastic zone in the fault waterproof coal pillar recovery process according to the analog calculation result, and further determining a water inrush path of the floor aquifer communicated with the plastic zone.
And then, according to the reserved spatial position relation among the water inrush path, the working face and the fault waterproof coal pillar, dividing the area influencing the exploitation of the fault waterproof coal pillar into a fault coal pillar grouting area, a fault coal pillar top plate grouting reinforcement area, a working face bottom plate grouting reinforcement area and a fault zone grouting reinforcement area. Specifically, in the working face mining, when a waterproof coal pillar is reserved in a fault, in the mining design of the working face (comprising a coal bed and a top and bottom rock stratum), the fault coal pillar, a fault zone, a bottom water-bearing stratum and the like, a main water inrush path existing under the condition of shortening the fault mining is found, and grouting is partitioned by taking the water inrush path as a condition.
The fault coal pillar grouting area is a whole reserved fault waterproof coal pillar; the grouting reinforcement area of the top plate of the fault coal pillar is an area from the top of the coal pillar to the bottom of another coal pillar of the fault, wherein the upper rock stratum of the whole reserved fault waterproof coal pillar is higher than the top of the coal pillar; the grouting reinforcement area of the bottom plate of the working face is an area from the boundary of the fault zone to the other end of the working face and from the bottom plate of the working face to the top of the waterproof layer; the fault zone grouting reinforcement area is an area with the height from a fault waterproof coal pillar to the junction of the fault and the aquifer and the width of the fault zone.
Step S102, carrying out a first water pumping test on the bottom plate and the fault zone to determine the water richness of the bottom plate and the fault zone, carrying out first water drainage on the bottom plate and the fault zone until the unit water inflow amount reaches a preset water inflow range, and stopping the first water drainage;
in this application, through the first test of drawing water, confirm the rich water nature in bottom plate and fault zone, especially drilling gush water yield and unit gush water yield, then according to drilling gush water yield and unit gush water yield to bottom plate and fault zone dredge the water. Specifically, hydrogeological drilling is performed on a bottom plate grouting reinforcement area and a fault zone grouting reinforcement area of the working face so as to respectively perform a first water pumping test on the bottom plate and the fault zone and determine the water-rich property of the bottom plate and the fault zone; and then, draining water for the first time on the bottom plate and the fault zone according to the water inflow amount of the drilled hole until the unit water inflow amount reaches a preset water inflow range, and stopping draining water for the first time.
In the application, whether to stop draining water for the first time can be determined according to the unit water inflow amount, and whether to stop draining water for the first time can also be determined according to the drilling water inflow amount. Specifically, when the unit water inflow reaches q ∈ (0.1,1)]L/(s.m), or the drilling water inflow Q ∈ (60, 600)]m 3 And when the water is discharged for the first time, the water can be stopped.
When water is drained for the first time, a mining geological drilling machine is adopted to drill hydrogeological drill holes with the diameter of 70-90 mm to a bottom plate grouting reinforcement area and a fault zone grouting reinforcement area of a working surface, wherein the number of the hydrogeological drill holes in the bottom plate is 3-6, and the number of the hydrogeological drill holes in the fault zone is 2-4; the length of the hydrogeological borehole in the bottom plate is determined according to the vertical distance between the bottom plate and the aquifer, and the length of the hydrogeological borehole in the fault zone is determined according to the reserved width of the coal pillar and the width of the fault zone. Specifically, the hydrogeological drill hole in the bottom plate is drilled to be 1-2 meters away from the top of the aquifer of the bottom plate, and the length of the hydrogeological drill hole in the fault zone is the sum of the width of the coal pillar and half of the thickness of the fault zone.
And S103, respectively carrying out grouting reinforcement on a bottom plate grouting reinforcement area, a fault zone grouting reinforcement area, a fault coal pillar grouting area and a fault coal pillar top plate grouting reinforcement area of the working face.
Specifically, grouting holes are formed in the grouting reinforcement area of the fault zone, grouting reinforcement is conducted, the thickness of a water-resisting layer of the bottom plate is increased, and a water inrush path of the bottom plate is blocked. That is to say, through consolidating the district and carrying out the slip casting to fault zone slip casting and strengthening, increase bottom plate aquifer thickness has realized the shutoff of the gushing water passageway of the aquifer intercommunication bottom plate that exists.
And (3) applying grouting holes to the fractured zone grouting reinforcement area for grouting reinforcement so as to fill fractured zone broken rock body fractures, plugging the fractured zone to connect a waterproof coal pillar water inrush path, and connecting the fractured zone to the fractured zone part in the coal pillar top plate water inrush path. Namely, the fractured zone fractured rock body crack is filled by grouting and reinforcing the fractured zone grouting and reinforcing area, and the plugging of the water inrush channel of the aquifer communicated with the fractured zone is realized.
And (4) grouting holes are formed in the fault coal pillar grouting area for grouting reinforcement, and the blocking fault zone is connected with a waterproof coal pillar water inrush path. Namely, grouting reinforcement is carried out on a grouting area of the fault coal pillar, so that on one hand, a gushing water channel of the coal pillar connecting a fault zone is blocked; on the other hand, the integrity and the strength of the coal pillar are improved, and the method is favorable for the recovery of the subsequent fault waterproof coal pillar.
And (4) grouting holes are formed in the grouting reinforcement area of the top plate of the fault coal pillar for grouting reinforcement, and the blocking fault zone is connected with the water inrush path of the top plate of the coal pillar. Namely, the plugging of the inrush water channel of the coal pillar top plate connection fault zone is realized by grouting and reinforcing the grouting reinforcement area of the fault coal pillar top plate.
In this application, when the waterproof coal pillar of foundation fault mined, with the sequence of aquifer conduction, at first carry out the slip casting to fault area slip casting reinforcing area, fault area slip casting reinforcing area and consolidate, then, carry out the slip casting to fault coal pillar slip casting reinforcing area, at last, carry out the slip casting to fault coal pillar roof slip casting reinforcing area and consolidate.
In the process of grouting and reinforcing each subarea, a working face bottom plate grouting reinforcing area, a fault zone grouting reinforcing area and a fault coal pillar top plate grouting reinforcing area are subjected to grouting and reinforcing by adopting a first grouting material, and the grouting pressure is at least 1MPa greater than the pressure of a water-bearing stratum. Wherein the first grouting material is cement paste or cement paste doped with fly ash, and the water-cement ratio in the cement paste doped with fly ash is 0.5-0.7.
And (3) grouting and reinforcing the fault coal pillar grouting area by adopting a second grouting material, wherein the slurry ratio is 0.5. The second grouting material is a chemical organic material with small influence on coal washing and use, such as Li san, water-soluble polyurethane, urea-formaldehyde resin and the like. Therefore, on one hand, the influence of grouting on the fault waterproof coal pillar can be eliminated, so that the fault waterproof coal pillar can be conveniently subjected to subsequent processing and utilization after stoping, such as power generation, coalification processing and the like; on the other hand, the tiny cracks are convenient to fill, and the integrity of the coal pillar is improved.
And S104, performing a second water pumping test on the bottom plate and the fault zone, determining the water-rich property of the bottom plate and the fault zone, performing second water drainage on the bottom plate and the fault zone until the unit water inflow amount is less than or equal to a preset water inflow threshold value, and performing fault waterproof coal pillar recovery mining on the working face.
In the application, the second water pumping test and the second water draining test can adopt similar operations to the first water pumping test and the first water draining test, and the difference is that when hydrogeological drilling holes with the diameter of 70-90 mm are drilled in a bottom plate grouting reinforcement area and a fault zone grouting reinforcement area of a working face, the number of the drilling holes in the bottom plate is 3, and the length is determined according to the vertical distance between the bottom plate and a water-bearing layer; the number of the drill holes in the fault zone is 2, and the length is determined according to the reserved width of the coal pillar and the width of the fault zone. When water is drained for the second time, when the unit water inflow Q is less than or equal to 0.1L/(s.m) or the drilling water inflow Q is less than or equal to 60m 3 And in the time of/h, the requirements of indexes such as water pressure, water inrush coefficient and the like during the exploitation of the fault type coal pillar are met, and the recovery exploitation of the fault waterproof coal pillar can be carried out.
Therefore, by carrying out detailed grouting partition division on the fault waterproof coal pillar extraction area, firstly draining water on the bottom plate and the fault zone and then carrying out partition grouting according to the divided grouting partition, the problem of water inrush during fault coal pillar extraction is effectively solved, the extraction control of the fault waterproof coal pillar is more comprehensive and scientific, and the recovery rate of the fault waterproof coal pillar is effectively improved.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (6)
1. A zonal grouting construction method for a mining fault waterproof coal pillar is characterized by comprising the following steps:
step S101, determining a water inrush path of a plastic zone in a process that a bottom plate aquifer is communicated with a fault waterproof coal pillar extraction based on an established fault waterproof coal pillar evolution model, and dividing a region influencing the fault waterproof coal pillar extraction into a fault coal pillar grouting region, a fault coal pillar top plate grouting reinforcement region, a working surface bottom plate grouting reinforcement region and a fault zone grouting reinforcement region according to the reserved spatial position relation of the water inrush path, a working surface and the fault waterproof coal pillar; the water inrush path comprises a bottom plate water inrush path, a fault zone connecting waterproof coal pillar water inrush path and a fault zone connecting coal pillar top plate water inrush path;
step S102, carrying out a first water pumping test on a bottom plate and a fault zone to determine the water richness of the bottom plate and the fault zone, carrying out first water drainage on the bottom plate and the fault zone until the unit water inflow amount reaches a preset water inflow range, and stopping the first water drainage;
step S103, grouting holes are formed in the grouting reinforcement area of the bottom plate of the working face, grouting reinforcement is conducted to increase the thickness of a water-resisting layer of the bottom plate, and a water inrush path of the bottom plate is plugged;
grouting holes are formed in the fault zone grouting reinforcement area for grouting reinforcement so as to fill fracture of a fractured rock body of the fault zone and plug a fault zone part in a fault zone connection waterproof coal pillar water inrush path and a fault zone connection coal pillar top plate water inrush path;
grouting holes are formed in the fault coal pillar grouting area for grouting reinforcement, and the blocking fault zone is connected with a waterproof coal pillar water inrush path;
grouting holes are formed in the grouting reinforcement area of the top plate of the fault coal pillar for grouting reinforcement, and the blocking fault zone is connected with a water inrush path of the top plate of the coal pillar;
and S104, performing a second water pumping test on the bottom plate and the fault zone, determining the water-rich property of the bottom plate and the fault zone, performing second water drainage on the bottom plate and the fault zone until the unit water inflow is less than or equal to a preset water inflow threshold value, and performing fault waterproof coal pillar recovery mining on the working face.
2. The zonal grouting construction method for the mining fault waterproof coal pillar according to claim 1,
the bottom plate grouting reinforcement area of the working face, the fault zone grouting reinforcement area and the fault coal pillar top plate grouting reinforcement area are subjected to grouting reinforcement by adopting a first grouting material, and grouting pressure is at least 1MPa greater than aquifer pressure;
the first grouting material is cement paste or cement paste doped with fly ash, and the water-cement ratio of the cement paste doped with fly ash is (0.5) - (1-0.7).
3. The zonal grouting construction method for the stoping fault waterproof coal pillar according to claim 1, wherein a second grouting material is adopted in a fault coal pillar grouting area for grouting reinforcement, and the grouting pressure is 1-2MPa; wherein the slurry ratio of the second grouting material is 0.5 to 0.7.
4. The zonal grouting construction method for the mining fault waterproof coal pillar according to claim 1, wherein step S102 specifically comprises:
performing hydrogeological drilling on the bottom plate grouting reinforcement area and the fault zone grouting reinforcement area of the working face so as to respectively perform a first water pumping test on the bottom plate and the fault zone and determine the water-rich property of the bottom plate and the fault zone; and then, draining water for the first time on the bottom plate and the fault zone according to the water inflow amount of the drilled hole until the unit water inflow amount reaches a preset water inflow range, and stopping draining water for the first time.
5. The zonal grouting construction method for the mining fault waterproof coal pillar according to claim 4, wherein the number of the hydrogeological drill holes in the bottom plate is 3-6, and the length of the hydrogeological drill holes in the bottom plate is determined according to the vertical distance between the bottom plate and the aquifer;
and the combination of (a) and (b),
the number of the hydrogeological drill holes in the fault zone is 2-4, and the length of the hydrogeological drill holes in the fault zone is determined according to the reserved width of a coal pillar and the width of the fault zone.
6. The zonal grouting construction method for the mining fault waterproof coal pillar according to any one of claims 1 to 5, characterized in that,
the preset water inrush range is (0.1,1) < L/(s '< 8729and m >, and the preset water inrush threshold value is 0.1 < L/(s' < 8729and m >.
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| CN104819010A (en) * | 2015-03-26 | 2015-08-05 | 山东科技大学 | Construction method used for preventing roof and floor water inrush in the case that mine working surfaces pass through faults with water permeability |
| CN106050185A (en) * | 2016-05-13 | 2016-10-26 | 山东科技大学 | Method for preventing and controlling water inrush channels generated by faults of coal mining floors |
| CN108374662A (en) * | 2018-01-31 | 2018-08-07 | 鄂尔多斯市国源矿业开发有限责任公司 | The conduction method of artesian water tomography is crossed in a kind of tunnel |
| CN110159267A (en) * | 2019-04-18 | 2019-08-23 | 中国矿业大学 | A kind of water-bearing layer segmenting slip casting curtain water retaining mining method |
| CN110985058A (en) * | 2019-12-26 | 2020-04-10 | 安徽理工大学 | Grouting reinforcement method for fault fracture zone of coal face |
| CN111894588A (en) * | 2020-08-17 | 2020-11-06 | 中煤地质集团有限公司 | Grouting treatment method for coal seam roof ultra-thick water-containing layer area |
| CN112412532A (en) * | 2020-11-27 | 2021-02-26 | 陕西旬邑青岗坪矿业有限公司 | Advanced prevention and control method for water damage of fault roof of working face |
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