CN114837663A - 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 112
- 238000011084 recovery Methods 0.000 title claims abstract description 29
- 238000010276 construction Methods 0.000 title claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 95
- 238000005553 drilling Methods 0.000 claims abstract description 86
- 238000005065 mining Methods 0.000 claims abstract description 34
- 238000005086 pumping Methods 0.000 claims abstract description 13
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 12
- 239000000463 material Substances 0.000 claims description 15
- 239000004568 cement Substances 0.000 claims description 8
- 239000011435 rock Substances 0.000 claims description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 10
- 230000002787 reinforcement Effects 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 230000004048 modification Effects 0.000 description 4
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- 229910000831 Steel Inorganic materials 0.000 description 2
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- 230000004888 barrier function Effects 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 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
- 239000002893 slag Substances 0.000 description 1
- 238000007569 slipcasting Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
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- E—FIXED CONSTRUCTIONS
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- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
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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 plane projection range boundary [20,50] m, arranging a main drilling hole on the ground; two secondary drill holes are drilled 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 the coal seam floor and the 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. The ground grouting is generally selected to be carried out above the goaf, and 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 purpose, 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 a 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; s102, distributing main drill holes on the ground outside the plane projection range boundary [20,50] m; 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 a bottom plate aquifer in a fault zone; step S104, performing a first water pumping test on the coal seam floor and the fault zone to determine the water enrichment 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 aperture of the secondary drill holes is [60,80] mm, and an aperture reserved space of at least 10mm is arranged between two secondary drill holes.
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; the water-cement ratio of the grouting material of the coal seam top and bottom plate is 0.5: 1-0.7: 1; the water-cement ratio of the grouting material of the fault zone is 0.7: 1-1: 1.
Preferably, the grouting pressure of the coal seam floor is 3 MPa; 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 0.1L/(s · m).
Has the advantages that:
in 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 range of a mined out area of the mining working face and the fault waterproof coal pillar after mining and the planar projection range of the mined out area (the mined out area range) on the ground, laying a main drilling hole on the ground at [20,50] m outside the boundary of the planar projection range, drilling the main drilling hole to a preset position, and then parallelly drilling two secondary drilling holes at the hole bottom of the main drilling hole, 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 a middle floor of a fault zone, then performing a first water pumping test on the coal seam floor and the fault zone, determining the water-rich properties of the coal seam floor and the fault zone, and performing first water drainage on the coal seam floor and the fault zone, stopping draining water for the first time until the unit water inflow reaches a preset water inflow range; then, grouting and reinforcing the coal seam floor and the fault zone respectively; 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 layout of a construction method for improving fault waterproof coal pillar recovery rate by ground pre-grouting 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 fig. 2, the construction method for improving the recovery rate of the fault waterproof coal pillar by ground pre-grouting comprises the following steps:
and S101, before stoping of the working face, determining the planar projection range of the mined-out area of the mined-out working face and the mined-out area of the fault waterproof coal pillar on the ground according to the 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 and the fault waterproof coal pillar and the ground space position, namely the corresponding position relation between the underground and the aboveground, 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 working face and the fault waterproof coal pillar are mined is simulated mining in the mining model, and the goaf range and the plane projection range corresponding to the goaf range are determined according to the simulated mining result.
And S102, outside the plane projection range boundary [20,50] m, and arranging main drill holes 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 arranged at an interval of [100,200] m outside the plane projection range boundary of the ground of a mined-out working face and a mined-out area of a fault waterproof coal pillar after mining according to the strike length of the mined-out working face [20,50 ]. And (3) drilling main drill holes [20,50] m outside the plane projection range boundary of the goaf on the ground, so that damage to the reinforcing grouting drill holes after a caving zone is formed in the working face mining process can be effectively eliminated. The number of main drilling holes is 5-10,
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 30m below the coal seam floor, and the other secondary drilling hole is drilled to [10,15] m above the water-bearing stratum of the floor in the fault zone.
In the application, in the main drilling hole drilling process, 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 a mining model. Specifically, the main drilling hole is drilled to the old top in response to the fact that the thickness of the direct top layer is smaller than the preset layer thickness, and otherwise, the main drilling hole is drilled to the coal seam top plate. 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 positioned above the direct top and has a hard and thick rock stratum. 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. In the drilling process of the secondary drill holes, the aperture of each secondary drill hole is [60,80] mm, and at least 10mm of aperture reserved space is arranged between every two secondary drill 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 10 mm. It will be appreciated that the diameter of the main bore is in the range of [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, and the seamless steel pipe is in direct contact with surrounding rocks on the wall of the secondary drilling hole, so that 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 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 borehole in the coal seam floor is determined according to the vertical distance between the floor 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 drilling holes in the bottom plate are drilled to a distance of 1-2 meters from the top of the water-bearing stratum of the bottom plate, and the length of the hydrogeological drilling holes 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 is prepared from waste materials such as fly ash, coal gangue and slag and cement slurry, and is used for reinforcing the floor rock stratum and reforming the 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: 1-0.7: 1, and the grouting pressure is 3 MPa; the water-cement ratio of the grouting material of the fault zone is 0.7: 1-1: 1, and the grouting pressure is [1, 3] MPa.
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. Wherein, the second water pumping test and the second water draining test can adopt the similar operation as the first water pumping test and the first water draining test, and the difference lies in that the bottom plate of the working face is groutedWhen hydrogeological drilling holes with the diameter of 70-90 mm are drilled in the reinforcing area and the fault zone grouting reinforcing area, 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 the aquifer; 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 method is considered to meet the index requirements of water pressure, water bursting coefficient and the like during the mining of the fault type coal pillar, and can be used for recovering and mining the fault waterproof coal pillar.
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 (8)
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 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] m;
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 a bottom plate aquifer in a fault zone;
step S104, performing a first water pumping test on the coal seam floor and the fault zone to determine the water enrichment 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.
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 S102,
and (3) arranging one main drilling hole at an interval of [100,200] m according to the running length of the mining working face.
3. 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, drilling the main drilling hole to a preset position comprises:
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.
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 S103,
the aperture of the secondary drill holes is [60,80] mm, and at least 10mm of aperture reserved space is arranged between the two secondary drill holes.
5. 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.
6. 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 and reinforcing the coal seam floor and the fault zone by adopting different grouting materials respectively; the water-cement ratio of the grouting material of the coal seam top and bottom plate is 0.5: 1-0.7: 1; the water-cement ratio of the grouting material of the fault zone is 0.7: 1-1: 1.
7. The construction method for improving the recovery rate of the fault waterproof coal pillar by ground pre-grouting according to claim 6, wherein the grouting pressure of the coal seam floor is 3 MPa; the grouting pressure of the fault zone is [1, 3] MPa.
8. 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 0.1L/(s.m).
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116122815A (en) * | 2023-03-14 | 2023-05-16 | 安徽恒源煤电股份有限公司 | Safe recovery evaluation method and system for working face shortened fault waterproof coal pillar |
| CN116122815B (en) * | 2023-03-14 | 2023-08-08 | 安徽恒源煤电股份有限公司 | Safe recovery evaluation method and system for working face shortened fault waterproof coal pillar |
| CN116927784A (en) * | 2023-07-13 | 2023-10-24 | 安徽恒源煤电股份有限公司 | Construction method for narrowing working face of fault coal pillar to widen |
| 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 |
| CN116792099A (en) * | 2023-07-14 | 2023-09-22 | 安徽建筑大学 | Construction method and system for stoping fault waterproof coal pillar under upper and lower aquifer conditions |
| CN116792099B (en) * | 2023-07-14 | 2024-04-16 | 安徽建筑大学 | Construction method and system for stoping fault waterproof coal pillar under upper and lower aquifer conditions |
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| CN114837663B (en) | 2023-01-17 |
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