CN114837663B - Construction method for improving recovery rate of fault waterproof coal pillar through ground pre-grouting - Google Patents
Construction method for improving recovery rate of fault waterproof coal pillar through ground pre-grouting Download PDFInfo
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- 239000003245 coal Substances 0.000 title claims abstract description 114
- 238000011084 recovery Methods 0.000 title claims abstract description 28
- 238000010276 construction Methods 0.000 title claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 99
- 238000005553 drilling Methods 0.000 claims abstract description 80
- 238000005065 mining Methods 0.000 claims abstract description 35
- 238000005086 pumping Methods 0.000 claims abstract description 14
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims description 15
- 230000002787 reinforcement Effects 0.000 claims description 10
- 239000004568 cement Substances 0.000 claims description 8
- 239000011435 rock Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 abstract description 10
- 230000008569 process Effects 0.000 description 6
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
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- 230000015572 biosynthetic process Effects 0.000 description 1
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- 239000010881 fly ash Substances 0.000 description 1
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- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
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- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
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Abstract
The application provides a construction method for improving the recovery rate of fault waterproof coal pillars through ground pre-grouting. According to the method, before stoping of a working face, the planar projection range of a mined-out area of the mined-out working face and a mined-out area of a fault waterproof coal pillar after mining on the ground is determined according to the reserved space positions of the mined-out working face and the fault waterproof coal pillar; outside the boundary of the plane projection range [20,50] m, arranging a main drilling hole on the ground; drilling two secondary drill holes in parallel at the hole bottom of the main drill hole; carrying out a first water pumping test on the coal seam floor and the fault zone, determining the water-rich property of the coal seam floor and the fault zone, and carrying out first water drainage on the coal seam floor and the fault zone until the unit water inflow amount reaches a preset water inflow range; grouting and reinforcing a coal seam floor and a fault zone respectively; and carrying out a second water pumping test on the coal seam floor and the fault zone, determining the water-rich property of the coal seam floor and the fault zone, and when the unit water inflow amount is less than or equal to a preset water inflow threshold value, carrying out fault waterproof pillar recovery and mining on the working face.
Description
Technical Field
The application relates to the technical field of coal mine safety mining, in particular to a construction method for improving the recovery rate of fault waterproof coal pillars through ground pre-grouting.
Background
Along with the deep development, the demand of energy is also getting bigger and bigger, the shallow coal resource is about to be exhausted, the deep coal mining becomes the mainstream, and the recovery of the fault waterproof coal pillar becomes an effective way for saving the coal resource.
At present, fault waterproof coal pillar recovery mainly adopts working face bottom plate grouting reinforcement measures, but working face operation space is small, and the problems that grouting range is uncontrollable, grouting effect cannot meet requirements and the like exist, and normal recovery of the working face is particularly influenced. And the ground grouting is generally selected to be carried out above the goaf, so that the problems of hole collapse, instability and the like of drilling exist.
Therefore, a fault waterproof coal pillar recovery construction method which does not affect normal mining of a working face needs to be provided.
Disclosure of Invention
The application aims to provide a construction method for improving the recovery rate of fault waterproof coal pillars through ground pre-grouting so as to solve or relieve the problems in the prior art.
In order to achieve the above object, the present application provides the following technical solutions:
the application provides a construction method for improving fault waterproof coal pillar recovery rate by ground pre-grouting, which comprises the following steps: step S101, before stoping of a working face, determining the planar projection range of the mined-out working face and the mined-out area of the fault waterproof coal pillar after mining on the ground according to the reserved space positions of the mined-out working face and the fault waterproof coal pillar; s102, distributing main drill holes on the ground outside the plane projection range boundary [20,50 ]; step S103, responding to the drilling of the main drilling hole to a preset position, and drilling two secondary drilling holes in parallel at the hole bottom of the main drilling hole, wherein one secondary drilling hole is drilled to be 30m below the coal seam floor, and the other secondary drilling hole is drilled to be [10,15] m above the bottom plate aquifer in the fault zone; step S104, performing a first water pumping test on the coal seam floor and the fault zone to determine the water richness of the coal seam floor and the fault zone, performing first water drainage on the coal seam floor and the fault zone until the unit water inflow amount reaches a preset water inflow range, and stopping the first water drainage; s105, grouting and reinforcing the coal seam floor and the fault zone respectively; and S106, carrying out a second water pumping test on the coal seam floor and the fault zone, determining the water enrichment of the coal seam floor and the fault zone, and carrying out fault waterproof pillar recovery and mining on the working face when the unit water inflow amount is less than or equal to a preset water inflow threshold value.
Preferably, in step S102, one main drilling hole is arranged at an interval [100,200] m according to the running length of the mining working face.
Preferably, in step S103, drilling the main bore hole to a preset position includes: and responding to the fact that the thickness of the direct top layer is smaller than the preset layer thickness, drilling the main drilling hole to the old top, and otherwise, drilling the main drilling hole to the coal seam top plate.
Preferably, in step S103, the secondary boreholes have an aperture of [60,80] mm, and a hole-diameter-reserving space of at least 10mm is provided between the two secondary boreholes.
Preferably, a seamless pipe is additionally arranged in the secondary drilling hole drilled into the fault zone to prevent the crushed rock body from entering the corresponding secondary drilling hole, and grouting is carried out through the seamless pipe.
Preferably, in step S105, different grouting materials are respectively adopted for grouting reinforcement on the coal seam floor and the fault zone; wherein the water-cement ratio of the grouting material of the coal seam top and bottom plate is 0.5; the water-cement ratio of the grouting material of the fault zone is 0.7-1.
Preferably, the grouting pressure of the coal seam floor is 3MPa; the grouting pressure of the fault zone is [1,3] MPa.
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 construction technology for improving the recovery rate of the fault waterproof coal pillar by ground pre-grouting, before stoping of a working face, according to the reserved space positions of a mining working face and the fault waterproof coal pillar, determining the mined-out area range of the mining working face and the mined-out area range of the fault waterproof coal pillar after mining and the plane projection range (the mined-out area range) of the mined-out working face and the fault waterproof coal pillar on the ground, arranging a main drilling hole on the ground, drilling two secondary drilling holes in parallel at the hole bottom of the main drilling hole after the main drilling hole is drilled to a preset position, wherein one secondary drilling hole is drilled to be 30m below a coal seam floor, the other secondary drilling hole is drilled to be 10,15 m above a water-bearing layer of the floor in a fault zone, then carrying out a first water pumping test on the coal seam floor and the fault zone, determining the water richness of the coal seam floor and the fault zone, carrying out first water drainage on the coal seam floor and the fault zone until the unit water inflow reaches the preset water drainage range, and stopping the first water drainage; then, respectively grouting and reinforcing the coal seam floor and the fault zone; and finally, carrying out a second water pumping test on the coal seam floor and the fault zone, determining the water-rich property of the coal seam floor and the fault zone, and carrying out fault waterproof pillar recovery and exploitation on the working face when the unit water inflow amount is less than or equal to a preset water inflow threshold value. Therefore, before the recovery, the coal seam floor and the fault zone are drilled and grouted from the ground, so that on one hand, the influence on coal mining is reduced; on the other hand, the ground drilling layout considers the stoping range of the whole stope and has comprehensive governing range according to the mining working face, the goaf range after the fault waterproof coal pillar is mined and the plane projection range of the goaf range on the ground; and finally, different grouting materials are respectively adopted for the coal seam floor and the fault zone, so that the pertinence is strong, and the reinforcing effect is obvious.
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 diagram of a construction method for improving recovery rate of fault waterproof coal pillars by ground pre-grouting according to some embodiments of the present application;
fig. 2 is a schematic diagram of a borehole arrangement of a construction method for improving recovery rate of a fault waterproof coal pillar through ground pre-grouting according to some embodiments of the present disclosure.
Detailed Description
The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments. 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 thereof. 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 fig. 2, the construction method for improving the recovery rate of the fault waterproof coal pillar by ground pre-grouting comprises the following steps:
step S101, before stoping of a working face, determining the plane projection range of a mined-out area of the mined-out working face and a mined-out area of a fault waterproof coal pillar on the ground according to reserved space positions of the mined-out working face and the fault waterproof coal pillar.
In the application, before the fault waterproof coal pillar is mined, in a mining model, according to the relation between the mining working face, the fault waterproof coal pillar and the ground space position, namely the corresponding position relation between the upper part and the lower part of a well, the goaf range after the mining working face and the fault waterproof coal pillar are mined is determined, and is corresponding to the ground, and the plane projection range of the goaf range after mining on the ground is determined. It can be understood that the goaf range after the mining of the mining working face and the fault waterproof coal pillar is simulated mining in the mining model, and the goaf range and the corresponding plane projection range are determined according to the simulated mining result.
And S102, outside the plane projection range boundary [20,50] m, and arranging a main drilling hole on the ground.
According to the method, the main drilling holes are drilled in the plane projection range of the ground in the mined-out goaf, on one hand, the stoping range of the whole stope is considered, and the governing range is comprehensive; on the other hand, adverse effects on the reinforced grouting drilling caused by goaf and overlying strata collapse and the like formed on the working face in the later period of mining are effectively avoided, and the influence on coal mining is reduced.
In the application, a main drilling hole is distributed at intervals of [100,200] m according to the running length of the mining working face outside the plane projection range boundary of a mined-out working face and a mined-out area of a fault waterproof coal pillar on the ground [20,50] m after the mining working face and the fault waterproof coal pillar are mined. Wherein, the main drilling hole is drilled outside the plane projection range (20, 50) m of the goaf on the ground, so that the damage to the reinforcing grouting drilling hole after the caving zone is formed in the mining process of the working face can be effectively eliminated. The number of main bores is here 5 to 10,
and S103, responding to the drilling of the main drilling hole to a preset position, and executing two secondary drilling holes in parallel at the hole bottom of the main drilling hole.
One secondary drilling hole is drilled to be 30m below the coal seam bottom plate, and the other secondary drilling hole is drilled to be m above the bottom plate water-bearing layer in the fault zone [10,15 ].
In the application, in the drilling process of the main drilling hole, the drilling depth of the main drilling hole is determined according to the geometric positions of a coal bed, a fault zone and a water-bearing stratum in the mining model. Specifically, in response to the fact that the thickness of the immediate roof is smaller than the preset thickness, the main drilling hole is drilled to the old roof, and otherwise, the main drilling hole is drilled to the coal seam roof. In the mining process, the old roof, the immediate roof, the coal bed, the bottom plate and the aquifer are arranged from top to bottom in sequence; wherein the old top is located above the immediate top and has a hard, thick rock formation. And in the drilling process of the main drilling hole, when the layer thickness of the direct roof is less than or equal to 2m, drilling the main drilling hole to the old roof.
In this application, two secondary drilling adopt directional drilling technique to be under construction to ensure that secondary drilling can reach preset position. And in the drilling process of the secondary drilling holes, the aperture of each secondary drilling hole is [60,80] mm, and an aperture reserved space of at least 10mm is arranged between every two secondary drilling holes. In particular, the sum of the diameters of two secondary boreholes extending in the same main borehole is smaller than the diameter of the main borehole, and the edges of the two secondary boreholes are spaced apart by at least 10mm. It will be appreciated that the diameter of the main bore is in the range [130,200] mm.
In this application, creep into and add seamless tubular product in the secondary drilling in the fault zone to prevent broken rock mass to get into the secondary drilling that corresponds, and carry out the slip casting through seamless tubular product. Specifically, a seamless steel pipe is additionally arranged in a secondary drilling hole which is drilled to a position (10, 15) m above a bottom plate aquifer in the fault zone, the seamless steel pipe is in direct contact with surrounding rocks of the wall of the secondary drilling hole, hole collapse of the secondary drilling hole in the fault zone is prevented, and broken rock mass of the fault zone is effectively prevented from entering the drilling hole.
And step S104, carrying out a first water pumping test on the coal seam floor and the fault zone to determine the water richness of the coal seam floor and the fault zone, carrying out first water drainage on the coal seam floor 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 test of drawing water for the first time, confirm the rich water nature of coal seam floor and fault zone, especially drilling gush water yield and unit gush water yield, then dredge the water according to drilling gush water yield and unit gush water yield to coal seam floor and fault zone. Specifically, hydrogeological drilling is respectively performed on grouting reinforcement areas of a coal seam floor and a fault zone, so as to respectively perform a first water pumping test on the coal seam floor and the fault zone and determine the water-rich property of the coal seam floor and the fault zone; and then, draining water for the first time on the coal seam floor 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.
The first drainage can be stopped according to the unit water inflow amount, and the first drainage can also be stopped according to the drilling water inflow amount. 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 coal seam floor grouting reinforcement area and a fault zone grouting reinforcement area, wherein the number of the hydrogeological drill holes in the coal seam floor is 3-6, and the number of the hydrogeological drill holes in the fault zone is 2-4; the length of the hydrogeological drill hole in the coal seam floor is determined according to the vertical distance between the floor and the aquifer, and the length of the hydrogeological drill hole 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 m away from the top of the water-bearing stratum 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.
S105, grouting and reinforcing the coal seam floor and the fault zone respectively;
specifically, in the grouting reinforcement process of the coal seam floor and the fault zone, the coal seam floor and the fault zone are respectively subjected to grouting reinforcement by adopting different grouting materials. The grouting material of the coal seam floor adopts waste materials such as fly ash, coal gangue and furnace slag and cement slurry, and is used for reinforcing a floor rock stratum and reforming a floor water barrier; the grouting material of the fault zone adopts a cement-based high-strength water plugging reinforcing material, a high-expansion polyurethane water plugging filling material or a silica gel grouting material so as to effectively block the water body from rising and permeating in the fault zone.
In the application, the water-cement ratio of the grouting material of the layer top bottom plate is 0.5; the water-cement ratio of the grouting material of the fault zone is 0.7.
And S106, carrying out a second water pumping test on the coal seam floor and the fault zone, determining the water-rich property of the coal seam floor and the fault zone, and carrying out fault waterproof pillar recovery mining on the working face when the unit water inflow amount is less than or equal to a preset water inflow threshold value.
In the application, if the unit water inflow amount is larger than the preset water inflow threshold value, the coal seam floor and the fault zone need to be drained for the second time until the unit water inflow amount is smaller than or equal to the preset water inflow threshold value. The method comprises the following steps of performing a first water pumping test on a working face bottom plate, performing a second water draining test on the working face bottom plate, and performing a second water draining test on the working face bottom plate, wherein 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 grouting reinforcement area of the working face bottom plate and a grouting reinforcement area of a fault zone, 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, before the recovery, the coal seam floor and the fault zone are drilled and grouted from the ground, so that the influence on coal mining is reduced; the ground drilling considers the stoping range of the whole stope, and the governing range is comprehensive; different grouting materials are respectively adopted for the coal seam floor and the fault zone, so that the pertinence is strong, and the reinforcing effect is obvious.
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 construction method for improving the recovery rate of fault waterproof coal pillars through ground pre-grouting is characterized by comprising the following steps:
step S101, before stoping of a working face, determining goaf ranges of a mined working face and a mined fault waterproof coal pillar according to corresponding position relations of an underground well and an aboveground well, corresponding the goaf ranges to the ground, and determining plane projection ranges of the mined working face and the mined fault waterproof coal pillar on the ground;
s102, distributing a main drilling hole at an interval of [100,200] m according to the running length of the mining working face outside the plane projection range boundary of the mining working face and the mined out area of the fault waterproof coal pillar on the ground [20,50 ];
step S103, responding to the fact that the thickness of the direct top layer is smaller than 2m, drilling the main drilling hole to an old top, and otherwise, drilling the main drilling hole to the coal seam top plate; drilling two secondary drill holes in parallel at the hole bottoms of the main drill holes, wherein one secondary drill hole is drilled to be 30m below the coal seam floor, and the other secondary drill hole is drilled to be [10,15] m above the bottom plate aquifer in the fault zone;
step S104, performing a first water pumping test on the coal seam floor and the fault zone to determine the water richness of the coal seam floor and the fault zone, performing first water drainage on the coal seam floor and the fault zone until the unit water inflow amount reaches a preset water inflow range, and stopping the first water drainage;
s105, respectively grouting and reinforcing the coal seam floor and the fault zone;
and S106, performing a second water pumping test on the coal seam floor and the fault zone, determining the water richness of the coal seam floor and the fault zone, and performing fault waterproof coal pillar recovery mining on a working face when the unit water inflow amount is less than or equal to a preset water inflow threshold value.
2. The construction method for improving the recovery rate of fault waterproof coal pillars by ground pre-grouting according to claim 1, wherein in step S103,
the aperture of the secondary drill holes is [60,80] mm, and an aperture reserved space of at least 10mm is arranged between the two secondary drill holes.
3. The construction method for improving the recovery rate of fault waterproof coal pillars by ground pre-grouting according to claim 1,
and drilling into the secondary drilling hole in the fault zone, additionally arranging a seamless pipe to prevent a broken rock body from entering the corresponding secondary drilling hole, and grouting through the seamless pipe.
4. The construction method for improving the recovery rate of fault waterproof coal pillars by ground pre-grouting according to claim 1, wherein in step S105,
grouting reinforcement is carried out on the coal seam floor and the fault zone by adopting different grouting materials respectively; wherein the water-cement ratio of the grouting material of the coal seam top and bottom plate is 0.5; the water-cement ratio of the grouting material of the fault zone is 0.7-1.
5. The construction method for improving the recovery rate of the fault waterproof coal pillar by ground pre-grouting according to claim 4, wherein the grouting pressure of the coal seam floor is 3MPa; the grouting pressure of the fault zone is [1,3] MPa.
6. The construction method for improving the recovery rate of fault waterproof coal pillars by ground pre-grouting according to claim 1,
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).
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| CN116927784B (en) * | 2023-07-13 | 2024-05-07 | 安徽恒源煤电股份有限公司 | Construction method for narrowing working face of fault coal pillar to widen |
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