CN114370251A - Directional grading and zoning grouting method for overburden bed separation during downward mining of coal seam group - Google Patents
Directional grading and zoning grouting method for overburden bed separation during downward mining of coal seam group Download PDFInfo
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- CN114370251A CN114370251A CN202210043379.9A CN202210043379A CN114370251A CN 114370251 A CN114370251 A CN 114370251A CN 202210043379 A CN202210043379 A CN 202210043379A CN 114370251 A CN114370251 A CN 114370251A
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- 239000003245 coal Substances 0.000 title claims abstract description 85
- 238000005065 mining Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000000926 separation method Methods 0.000 title claims abstract description 23
- 238000013316 zoning Methods 0.000 title claims abstract description 6
- 238000005553 drilling Methods 0.000 claims abstract description 22
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000011435 rock Substances 0.000 abstract description 6
- 238000004080 punching Methods 0.000 abstract description 2
- 238000010276 construction Methods 0.000 abstract 1
- 239000000463 material Substances 0.000 description 9
- 239000011440 grout Substances 0.000 description 7
- 238000007569 slipcasting Methods 0.000 description 6
- 238000005457 optimization Methods 0.000 description 5
- 239000002002 slurry Substances 0.000 description 5
- 230000032798 delamination Effects 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/105—Transport or application of concrete specially adapted for the lining of tunnels or galleries ; Backfilling the space between main building element and the surrounding rock, e.g. with concrete
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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Abstract
The invention discloses a directional grading and zoning grouting method for overburden separation in downward mining of a coal seam group, which comprises the following steps of S1, mining of a coal seam: determining key layer positions above a plurality of coal layers; s2, laying a grouting hose: paving a grouting hose in the uppermost key layer; s3, drilling a vertical drilling hole: drilling vertical drill holes in the direction of a plurality of key layers in an area which is not influenced by mining, wherein the vertical drill holes extend into the key layers; s4, installing a main grouting pipe: a main grouting pipe is placed into the vertical drilling hole and communicated with the main grouting pipe and a grouting hose; s5, grouting key layers: and grouting into the main grouting pipe, wherein the main grouting pipe performs grouting to the key layer on the uppermost layer through a grouting hose. The method can realize the embedding of the main grouting pipe in the area which is not influenced by mining, realizes the durability of the grouting method, realizes the large-scale and standardized construction of the multi-coal-seam layered mining overburden rock separation layer grouting, ensures the grouting amount, greatly improves the grouting efficiency, saves the grouting cost and reduces the workload of multiple times of punching.
Description
Technical Field
The invention relates to the technical field of coal mining, in particular to a method for directional grading, zonal grouting of a overburden bed separation layer in downward mining of a coal seam group.
Background
After the underground coal seam is mined, the stress of overlying strata and original rock above a goaf and a coal pillar is damaged, so that the overlying strata moves, deforms, breaks and even collapses, the ground surface sinks, farmlands and buildings are damaged, and the ecological environment is seriously damaged. During the movement of the rock stratum, a plurality of separation zones consisting of separation layers exist above the water flowing fractured zone. Most of the traditional grouting methods for solving the delamination zone are to punch and grout from the ground surface to the underground delamination zone, and the method has the disadvantages of large engineering quantity, time and labor waste and high cost. When multiple coal seams are mined, the separated layer area still needs to be re-perforated for grouting when the coal seams are mined.
Based on the existing situation, a directional grading and zoning grouting method for overburden separation in downward mining of a coal seam group is urgently needed, and the technical requirements of drilling one hole and injecting a whole well are met.
Disclosure of Invention
The invention aims to provide a directional grading and zoning grouting method for overburden bed separation during downward mining of a coal seam group, which solves the problems in the prior art, can realize that a main grouting pipe is buried in a zone which is not influenced by mining, realizes the durability of the grouting method, realizes large-scale and standardized grouting of multiple coal seam layering mining overburden bed separation layers, ensures the grouting amount, greatly improves the grouting efficiency, saves the grouting cost and reduces the workload of multiple times of punching.
In order to achieve the purpose, the invention provides the following scheme: the invention provides a directional grading zonal grouting method for overburden separation of downward mining of a coal seam group,
s1, mining a coal seam: determining key layer positions above a plurality of coal layers;
s2, laying a grouting hose: paving a grouting hose in the uppermost key layer;
s3, drilling a vertical drilling hole: drilling vertical drill holes in the direction of the key layers in a mining-unaffected area, wherein the vertical drill holes extend into the key layers;
s4, installing a main grouting pipe: a main grouting pipe is placed into the vertical drilling hole and communicated with the main grouting pipe and the grouting hose;
s5, grouting key layers: grouting into the main grouting pipe, wherein the main grouting pipe performs grouting to the key layer on the uppermost layer through the grouting hose;
s6, mining another coal seam: laying another grouting hose in the key layer above another coal seam, and communicating the main grouting pipe with the other grouting hose;
s7, mining coal beds at different positions: and repeating the step S6 to mine coal seams at different positions.
Preferably, in step S3, the vertical bore is located in a stope line that is not affected by mining.
Preferably, in step S4, two adjacent main grouting pipes are communicated with each other through a material distributing rotary pipe and a ball valve, a discharge end of the main grouting pipe located above is communicated with a feed end of the material distributing rotary pipe, a discharge end of the material distributing rotary pipe is communicated with a feed end of the ball valve, and a discharge end of the ball valve is communicated with a feed end of the grouting hose and a feed end of the main grouting pipe located below.
Preferably, a plurality of grouting hoses are respectively arranged on two sides of the spherical valve, and grouting is performed into the grouting hoses on any side face of the spherical valve when the coal seam on the side face is mined.
Preferably, in step S5, the main grouting pipe injects the grout into the delamination area through the grouting hose, and after the grouting is completed, water is supplied into the main grouting pipe.
Preferably, in step S5, a grouting station and a booster pump are installed on the ground, and the grouting station is communicated with the main grouting pipe.
Preferably, in step S5, the discharge end of the globe valve is communicated with the feed end of the grouting hose, the discharge end of the globe valve is closed with the feed end of the main grouting pipe located below, in step S6, the discharge end of the globe valve is closed with the feed end of the grouting hose, and the discharge end of the globe valve is communicated with the feed end of the main grouting pipe located below.
The invention discloses the following technical effects:
1. by adopting the method, the vertical drilling hole is drilled in the area which is not influenced by mining, the main grouting pipe is arranged in the vertical drilling hole, and the horizontal grouting hose is laid at the key layer position, so that the technical requirement of drilling one hole and injecting the whole well is realized, and the workload of drilling for multiple times is saved.
2. By adopting the method, when the two wings are mined and arranged on the working face, the slurry can be conveyed into the grouting hoses at different positions only by rotating the ball valves on the distributing rotary pipes, the method is convenient and quick, and the grouting efficiency is improved.
3. By adopting the method, after the mining of the coal seam positioned above is finished, only the ball valve on the material distribution rotating pipe needs to be adjusted, so that the slurry flows into the key layer corresponding to the coal seam positioned below from the main grouting pipe, a large amount of manpower and material resource investment is saved, and the method is a novel and appropriate subsidence reducing method.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a perspective view of a grouting process;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is a front view of the grouting process;
FIG. 4 is a schematic view of a grouting hose in relation to a first coal seam;
the method comprises the following steps of 1-key layer, 2-grouting hose, 3-main grouting pipe, 4-stoping line, 5-material separating transfer pipe, 6-ball valve, 7-separation layer area, 8-grouting station, 9-booster pump, 10-first coal layer, 11-second coal layer, 12-fracture area, 13-caving area and 14-goaf.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1-4, the invention provides a directional grading zonal grouting method for overburden separation of downward mining of coal seam groups,
s1, mining a coal seam: the location of the key layer 1 above several coal seams is determined. There is a first coal seam 10 and a second coal seam 11 to be mined, the first coal seam 10 being located above the second coal seam 11. The locations of first coal seam 10 and second coal seam 11 are first determined, and the locations of key strata 1 corresponding to first coal seam 10 and second coal seam 11 are determined.
S2, laying grouting hoses 2: paving a grouting hose 2 in the uppermost key layer 1; and (3) paving a grouting hose 2 in the key layer 1 corresponding to the first coal seam 10.
S3, drilling a vertical drilling hole: and drilling vertical drill holes in the direction of the key layers 1 in the area which is not influenced by mining, wherein the vertical drill holes extend into the key layers 1. A vertical borehole is drilled from the surface and needs to pass through the key seam 1 corresponding to the first coal seam 10 and the second coal seam 11.
S4, installing a main grouting pipe 3: and a main grouting pipe 3 is placed into the vertical drilling hole and is communicated with the main grouting pipe 3 and the grouting hose 2. Installing a main grouting pipe 3 into the vertical borehole, wherein the main grouting pipe 3 is used for circulating slurry, the main grouting pipe 3 should penetrate through all the key layers 1, and the main grouting pipe 3 is respectively communicated with different key layers 1.
S5, grouting the key layer 1: and grouting is carried out in the main grouting pipe 3, and the main grouting pipe 3 is used for grouting the key layer 1 on the uppermost layer through the grouting hose 2. Grouting operation is carried out from the ground into the main grouting pipe 3, and the grout enters the grouting hose 2 through the main grouting pipe 3 and flows into the key layer 1 from the grouting hose 2.
In one embodiment of the invention, the grouting hose 2 is uniformly provided with discharge holes (not shown in the figure), the opening and closing of the discharge holes can be controlled, the position of the separation layer area 7 is ascertained along with continuous mining of a working surface, and directional grouting of the separation layer area 7 is realized through the opening and closing of the discharge holes.
S6, mining another coal seam: and another grouting hose 2 is laid in the key layer 1 above another coal seam and communicated with a main grouting pipe 3 and the other grouting hose 2. And after the first coal seam 10 is mined, communicating the main grouting pipe 3 with the grouting hose 2 in the key layer 1 corresponding to the second coal seam 11, and mining the second coal seam 11.
In one embodiment of the present invention, when the first coal seam 10 is mined, the grouting hose 2 can be laid into the key layer 1 corresponding to the second coal seam 11.
S7, mining coal beds at different positions: and repeating the step S6 to mine coal seams at different positions. After the second coal seam 11 is mined, different coal seams can be mined by adjusting the main grouting pipe 3 to be communicated with different grouting hoses 2.
In a further optimization, in step S3, the vertical bore is located in the stope 4 unaffected by the mining. Because main slip casting pipe 3 passes a plurality of coal seams and rock mass, when coal seam and rock mass receive the exploitation disturbance, can cause the influence to main slip casting pipe 3, make main slip casting pipe 3 can not normally use even, should be provided with when the coal seam is exploited and stop adopting line 4, coal seam and rock mass in stopping adopting line 4 region do not receive the exploitation disturbance, consequently bore the vertical drilling in stopping adopting line 4.
In a further optimization scheme, in step S4, two adjacent main grouting pipes 3 are communicated with each other through a material distribution rotating pipe 5 and a ball valve 6, the discharge end of the main grouting pipe 3 located above is communicated with the feed end of the material distribution rotating pipe 5, the discharge end of the material distribution rotating pipe 5 is communicated with the feed end of the ball valve 6, and the discharge end of the ball valve 6 is communicated with the feed end of the grouting hose 2 and the feed end of the main grouting pipe 3 located below. The existence of globe valve 6 can control main slip casting pipe 3 and the slip casting hose 2 intercommunication of difference to can be quick carry out the slip casting operation to different key layer 1.
According to the further optimization scheme, the two sides of the spherical valve 6 are respectively provided with the plurality of grouting hoses 2, and when the coal bed on any side face of the spherical valve 6 is mined, grouting is conducted in the grouting hoses 2 on the side face. The main grouting pipe 3 is usually arranged in the middle of the mined coal seam, namely, mining areas exist on two wings of the ball valve 6, before mining, the grouting hose 2 is laid in the key layer 1 of any wing of the first coal seam 10, after the mining is finished, the grouting hose 2 is grouted to the wing grouting hose 2 and the coal seam of the wing is mined, when the coal seam of the wing is mined, the grouting hose 2 is laid in the key layer 1 corresponding to the other wing, and when the coal seam of the other wing is mined, the grouting hose 2 is laid in the key layer 1 corresponding to the second coal seam 11, so that the normal mining is not influenced by the laying of the grouting hose 2.
In one embodiment of the invention, the number of the grouting hoses 2 on any wing is preferably three, and all three grouting hoses 2 are communicated with the ball valve 6.
In a further optimization scheme, in step S5, the main grouting pipe 3 is grouted to the delamination area 7 through the grouting hose 2, and after grouting is completed, water is introduced into the main grouting pipe 3. When the main grouting pipe 3 stops feeding the grout into the grouting hose 2, water should be fed into the main grouting pipe 3 to prevent the grout from being coagulated in the main grouting pipe 3 and the grouting hose 2.
In a further optimized scheme, in step S5, a grouting station 8 and a booster pump 9 are installed on the ground, and the grouting station 8 is communicated with the main grouting pipe 3. The grouting station 8 is used to provide grout and the booster pump 9 is intended to force grout into the formation.
According to the further optimization scheme, in the step S5, the discharge end of the ball valve 6 is communicated with the feed end of the grouting hose 2, the discharge end of the ball valve 6 is closed with the feed end of the main grouting pipe 3 located below, in the step S6, the discharge end of the ball valve 6 is closed with the feed end of the grouting hose 2, and the discharge end of the ball valve 6 is communicated with the feed end of the main grouting pipe 3 located below. When the first coal seam 10 is mined, the ball valve 6 corresponding to the first coal seam 10 and the main grouting pipe 3 leading to the second coal seam 11 are in a closed state, so that slurry cannot flow into the key layer 1 corresponding to the second coal seam 11. After the first coal seam 10 is mined, the ball valve 6 corresponding to the first coal seam 10 and the main grouting pipe 3 leading to the second coal seam 11 are in an open state, so that the slurry flows into the key layer 1 corresponding to the second coal seam 11.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (7)
1. A directional grading and zoning grouting method for overburden bed separation in downward mining of coal seam groups is characterized in that,
s1, mining a coal seam: determining the positions of key layers (1) above a plurality of coal seams;
s2, laying a grouting hose (2): paving a grouting hose (2) in the uppermost key layer (1);
s3, drilling a vertical drilling hole: drilling vertical drill holes in the direction of the key layers (1) in an area which is not influenced by mining, wherein the vertical drill holes extend into the key layers (1);
s4, installing a main grouting pipe (3): a main grouting pipe (3) is placed into the vertical drilling hole and communicated with the main grouting pipe (3) and the grouting hose (2);
s5, grouting a key layer (1): grouting into the main grouting pipe (3), wherein the main grouting pipe (3) is used for grouting into the key layer (1) at the uppermost layer through the grouting hose (2);
s6, mining another coal seam: another grouting hose (2) is laid in the key layer (1) above another coal seam, and the main grouting pipe (3) is communicated with the other grouting hose (2);
s7, mining coal beds at different positions: and repeating the step S6 to mine coal seams at different positions.
2. The directional grading zonal grouting method for overburden separation of downward mining of coal seam groups according to claim 1, characterized in that: in step S3, the vertical bore is located in a stope line (4) that is not affected by mining.
3. The directional grading zonal grouting method for overburden separation of downward mining of coal seam groups according to claim 1, characterized in that: in the step S4, two adjacent main grouting pipes (3) are communicated with each other through a distributing rotary pipe (5) and a ball valve (6), the discharge end of the main grouting pipe (3) positioned above is communicated with the feed end of the distributing rotary pipe (5), the discharge end of the distributing rotary pipe (5) is communicated with the feed end of the ball valve (6), and the discharge end of the ball valve (6) is communicated with the feed end of the grouting hose (2) and the feed end of the main grouting pipe (3) positioned below.
4. The directional grading zonal grouting method for overburden separation of downward mining of coal seam groups according to claim 3, characterized in that: and a plurality of grouting hoses (2) are respectively arranged on two sides of the spherical valve (6), and grouting is performed into the grouting hoses (2) on any side face of the spherical valve (6) when the coal bed is mined.
5. The directional grading zonal grouting method for overburden separation of downward mining of coal seam groups according to claim 1, characterized in that: in the step S5, the main grouting pipe (3) performs grouting to the separation layer area (7) through the grouting hose (2), and after grouting is finished, water is introduced into the main grouting pipe (3).
6. The directional grading zonal grouting method for overburden separation of downward mining of coal seam groups according to claim 1, characterized in that: in step S5, a grouting station (8) and a booster pump (9) are installed on the ground, and the grouting station (8) is communicated with the main grouting pipe (3).
7. The directional grading zonal grouting method for overburden separation of downward mining of coal seam groups according to claim 3, characterized in that: in the step S5, the discharge end of the ball valve (6) is communicated with the feed end of the grouting hose (2), the discharge end of the ball valve (6) is closed with the feed end of the main grouting pipe (3) below, in the step S6, the discharge end of the ball valve (6) is closed with the feed end of the grouting hose (2), and the discharge end of the ball valve (6) is communicated with the feed end of the main grouting pipe (3) below.
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| CN202210043379.9A CN114370251B (en) | 2022-01-14 | 2022-01-14 | Coal seam group downstream mining overlying strata separation layer directional grading zonal grouting method |
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| CN202210043379.9A CN114370251B (en) | 2022-01-14 | 2022-01-14 | Coal seam group downstream mining overlying strata separation layer directional grading zonal grouting method |
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