CN108457651B - Coal mine roadside filling gob-side entry retaining hydraulic splitting roof cutting method - Google Patents
Coal mine roadside filling gob-side entry retaining hydraulic splitting roof cutting method Download PDFInfo
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- CN108457651B CN108457651B CN201810069139.XA CN201810069139A CN108457651B CN 108457651 B CN108457651 B CN 108457651B CN 201810069139 A CN201810069139 A CN 201810069139A CN 108457651 B CN108457651 B CN 108457651B
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- 239000003245 coal Substances 0.000 title claims abstract description 65
- 238000005520 cutting process Methods 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000004575 stone Substances 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims abstract description 6
- 239000002002 slurry Substances 0.000 claims description 12
- 238000005065 mining Methods 0.000 claims description 10
- 238000003776 cleavage reaction Methods 0.000 claims description 9
- 230000007017 scission Effects 0.000 claims description 9
- 238000005553 drilling Methods 0.000 claims description 6
- 238000004537 pulping Methods 0.000 claims description 6
- 238000012856 packing Methods 0.000 claims 3
- 235000014820 Galium aparine Nutrition 0.000 claims 2
- 240000005702 Galium aparine Species 0.000 claims 2
- 238000005422 blasting Methods 0.000 abstract description 7
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 230000003068 static effect Effects 0.000 abstract description 2
- 239000000945 filler Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21C—MINING OR QUARRYING
- E21C37/00—Other methods or devices for dislodging with or without loading
- E21C37/06—Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole
- E21C37/08—Devices with pistons, plungers, or the like, pressed locally against the wall of the borehole
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F15/00—Methods or devices for placing filling-up materials in underground workings
- E21F15/02—Supporting means, e.g. shuttering, for filling-up materials
- E21F15/04—Stowing mats; Goaf wire netting; Partition walls
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Remote Sensing (AREA)
- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The invention belongs to the technical field of gob-side entry retaining top cutting, and particularly relates to a hydraulic splitting top cutting method for a filling gob-side entry retaining beside a coal mine roadway. The single hydraulic prop is arranged on the side of the goaf, so that the safety of roof cutting operation is ensured, and the load borne by the filling body is reduced after roof cutting; the hydraulic splitter is adopted to split the coal stones on the top, the splitting length and the splitting depth can be designed at will, flexibility and changeability are achieved, and potential safety hazards caused by a blasting mode are avoided; meanwhile, the incompressible liquid is used as a pressure transmission medium in the topping work, so that the static controllability of the topping work is realized.
Description
Technical Field
The invention belongs to the technical field of gob-side entry retaining top cutting, and particularly relates to a hydraulic splitting top cutting method for a filling gob-side entry retaining beside a coal mine roadway.
Background
In the implementation of the coal mine gob-side entry retaining engineering, due to the action of mine pressure, a cantilever beam with certain width and height is formed at the top plate of the upper part of the roadside filling body. With the advance of the coal face, the cantilever beam can be broken, rotated and sunk, so that the cantilever beam becomes the supporting load of the roadside filling body. However, when the top plate is thick and hard, the cantilever beam greatly disturbs the roadside filler, and if no effective measures are taken for forced top cutting, the filler may deform or even damage due to overlarge supporting load, so that the whole gob-side entry retaining engineering fails.
At present, the forced top cutting measure of the gob-side entry retaining working face is mainly blasting, for example, a patent with the publication number of 104790954A provides a method for blasting and pressure relief of the gob-side entry retaining top cutting, however, the blasting and top cutting mode has the disadvantages of low speed, power failure, person withdrawal, blind blasting and other potential safety hazards, and the blasting and top cutting potential safety hazard in a goaf is particularly serious because the roadway-side entry retaining filling project needs to be lagged behind the coal mining working face for a certain distance during the process. Therefore, the safe and efficient roof cutting method has important significance for the smooth operation of the gob-side entry retaining engineering of the coal mine.
Disclosure of Invention
In order to solve the problems in the background art, the invention provides a hydraulic splitting roof cutting method for a coal mine roadside filling gob-side entry retaining.
The technical scheme of the invention is realized as follows: a coal mine roadside filling gob-side entry retaining hydraulic fracturing top-cutting method comprises the following steps:
the method comprises the following steps: drilling holes in the front of an end support of a coal seam working surface, installing anchor rods and anchor cables, and after coal is mined on the coal seam working surface, installing two rows of single hydraulic struts on one side of a mined-out area of a region to be filled to construct a temporary support;
step two: installing a template in the area to be filled, conveying filling slurry into the template by using pulping and conveying equipment, and forming a filling body after the filling slurry is solidified;
step three: after an end support of a coal seam working face is moved, a row of inclined splitting holes are drilled in a top plate on the goaf side of the edge of the filling body, and the spacing, the inclination angle and the length of the splitting holes are the same;
step four: selecting a splitting hole with a certain distance from a lagging coal face, and installing a column type splitter in the splitting hole, wherein column heads of the column type splitters face to the goaf side;
step five: taking the splitting holes selected in the fourth step as starting points, sequentially selecting at least two splitting holes according to the direction far away from the coal face, and installing column type splitters in the splitting holes, wherein the column type splitters installed in different splitting holes are connected in parallel;
step six: starting a hydraulic source, supplying liquid to the column type splitter through a hydraulic conveying pipeline to generate pressure, and enabling a column type splitter column head to apply in-hole tension to the gob-side entry retaining top layer, so that cracks are generated among splitting holes and are continuously expanded, and finally, through connection is realized among adjacent splitting holes, and coal stones on the outer layer of the top plate are split;
step seven: releasing pressure of the column type splitter, mounting the column type splitter in the middle of the splitting hole, repeating the steps from one step to six, and splitting the coal stone on the middle layer of the top plate;
step eight: releasing pressure of the column type splitter, mounting the column type splitter at the lower part of the splitting hole, repeating the steps from one step to six, and splitting coal stones at the bottom layer of the top plate;
step nine: after the splitting is completed, recovering the single hydraulic prop in the split area;
step ten: and repeating the steps from one step to nine steps until the roof splitting project of the whole gob-side entry retaining is completed.
Wherein, the template in the second step can be replaced by filling a flexible mold bag.
In the third step, the included angle between the cleavage holes and the perpendicular line of the plane of the top plate at the goaf side is 15-30 degrees, the distance between the adjacent cleavage holes is 0.6-1 m, the hole depth is 6-8 m, and the hole diameter is not less than 90 mm.
In the fourth step, the distance range of the lagging coal mining working face is 15-20 m.
In step four, 1~3 column type spliters can be installed simultaneously in same splitting hole, the column type spliters between adopt the series connection mode to connect.
In the fifth step, the number of the splitting holes for simultaneously splitting is 2-4.
The single hydraulic prop is arranged on the side of the goaf, so that the safety of roof cutting operation is ensured, and the load borne by the filling body is reduced after roof cutting; the hydraulic splitter is adopted to split the coal stones on the top, the splitting length and the splitting depth can be designed at will, flexibility and changeability are achieved, and potential safety hazards caused by a blasting mode are avoided; meanwhile, the incompressible liquid is used as a pressure transmission medium in the topping work, so that the static controllability of the topping work is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a cross-sectional view of a cleavage hole of the present invention;
FIG. 2 is a schematic diagram I of the splitting system according to the present invention;
FIG. 3 is a schematic view of a temporary support structure of the present invention;
FIG. 4 is a schematic diagram II of the splitting system according to the present invention;
the device comprises an end support 1, a filling body 2, a splitting hole 3, a hydraulic source 4, a hydraulic conveying pipeline 5, a column type splitter 6 and a column head of the column type splitter 7.
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 obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
Example 1: as shown in fig. 1 to 3, a coal mine roadside filling gob-side entry retaining hydraulic splitting roof cutting method comprises the following steps:
the method comprises the following steps: drilling holes in the front of an end support of a coal seam working surface, installing anchor rods and anchor cables, and after coal is mined on the coal seam working surface, installing two rows of single hydraulic struts on one side of a mined-out area of a region to be filled to construct a temporary support;
step two: installing a template in the area to be filled, conveying filling slurry into the template by using pulping and conveying equipment, and forming a filling body 2 after the filling slurry is solidified;
step three: after an end support 1 of a coal seam working surface is moved, a row of inclined splitting holes 3 are drilled in a top plate on the mining area side at the edge of a filling body 2, and the spacing, the inclination angle and the length of the splitting holes 3 are the same;
step four: selecting a splitting hole 3 with a certain distance from a lagging coal face, and installing 1 column type splitter 6 in the splitting hole 3, wherein column heads 7 of the column type splitters face to the goaf side;
step five: taking the splitting holes 3 selected in the fourth step as starting points, sequentially selecting two splitting holes 3 according to the direction far away from the coal face, as shown in fig. 2, installing 1 column type splitter 6 in each splitting hole 3, and connecting the column type splitters 6 installed in different splitting holes 3 in parallel;
step six: starting a hydraulic source 4, supplying liquid to a column type splitter 6 through a hydraulic conveying pipeline 5 to generate pressure, and enabling a column type splitter column head 7 to apply in-hole tension to a gob-side entry retaining top layer, so that cracks are generated among splitting holes 3 and are continuously expanded, and finally, through connection is realized among adjacent splitting holes 3, and coal stones on the outer layer of a top plate are split;
step seven: releasing pressure of the column type splitter 6, mounting the column type splitter 6 in the middle of the splitting hole 3, repeating the steps from the first step to the sixth step, and splitting the coal stone on the middle layer of the top plate;
step eight: releasing pressure of the column type splitter 6, mounting the column type splitter 6 at the lower part of the splitting hole 3, repeating the steps from one step to six, and splitting coal stones at the bottom layer of the top plate;
step nine: after the splitting is completed, recovering the single hydraulic prop in the split area;
step ten: and repeating the steps from one step to nine steps until the roof splitting project of the whole gob-side entry retaining is completed.
Example 2: a coal mine roadside filling gob-side entry retaining hydraulic fracturing top-cutting method comprises the following steps:
the method comprises the following steps: drilling holes in the front of an end support of a coal seam working surface, installing anchor rods and anchor cables, and after coal is mined on the coal seam working surface, installing two rows of single hydraulic struts on one side of a mined-out area of a region to be filled to construct a temporary support;
step two: installing a template in the area to be filled, conveying filling slurry into the template by using pulping and conveying equipment, and forming a filling body 2 after the filling slurry is solidified;
step three: after an end support 1 of a coal seam working face is moved, a row of inclined splitting holes 3 are drilled in a top plate on the side of a mining area at the edge of a filler 2, the included angle between each splitting hole 3 and the perpendicular line of the plane of the top plate on the side of the mining area is 15-30 degrees, the distance between every two adjacent splitting holes 3 is 0.6-1 m, the hole depth is 6-8 m, the hole diameter is not less than 90mm, and the distance, the inclination angle and the length of each splitting hole 3 are the same;
the other working steps are the same as in example 1.
Example 3: a coal mine roadside filling gob-side entry retaining hydraulic fracturing top-cutting method comprises the following steps:
the method comprises the following steps: drilling holes in the front of an end support of a coal seam working surface, installing anchor rods and anchor cables, and after coal is mined on the coal seam working surface, installing two rows of single hydraulic struts on one side of a mined-out area of a region to be filled to construct a temporary support;
step two: installing a template in the area to be filled, conveying filling slurry into the template by using pulping and conveying equipment, and forming a filling body 2 after the filling slurry is solidified;
step three: after an end support 1 of a coal seam working face is moved, a row of inclined splitting holes 3 are drilled in a top plate on the side of a mining area at the edge of a filler 2, the included angle between each splitting hole 3 and the perpendicular line of the plane of the top plate on the side of the mining area is 15-30 degrees, the distance between every two adjacent splitting holes 3 is 0.6-1 m, the hole depth is 6-8 m, the hole diameter is not less than 90mm, and the distance, the inclination angle and the length of each splitting hole 3 are the same;
step four: selecting a splitting hole 3 with a certain distance from a lagging coal face, and installing two column type splitters 6 in the splitting hole 3 as shown in figure 4, wherein the two column type splitters 6 are connected in series, and column heads 7 of the column type splitters face towards the goaf side;
step five: taking the splitting holes 3 selected in the fourth step as starting points, sequentially selecting three splitting holes 3 according to the direction far away from the coal face, as shown in fig. 4, installing two column type splitters 6 in each splitting hole 3, connecting the column type splitters 6 in the splitting holes 3 in series, and enabling column heads 7 of the column type splitters to face towards the goaf side; the other steps were the same as in example 1.
Example 4: a coal mine roadside filling gob-side entry retaining hydraulic fracturing top-cutting method comprises the following steps:
the method comprises the following steps: drilling holes in the front of an end support of a coal seam working surface, installing anchor rods and anchor cables, and after coal is mined on the coal seam working surface, installing two rows of single hydraulic struts on one side of a mined-out area of a region to be filled to construct a temporary support;
step two: installing a template in the area to be filled, conveying filling slurry into the template by using pulping and conveying equipment, and forming a filling body 2 after the filling slurry is solidified;
step three: after an end support 1 of a coal seam working face is moved, a row of inclined splitting holes 3 are drilled in a top plate on the side of a mining area at the edge of a filler 2, the included angle between each splitting hole 3 and the perpendicular line of the plane of the top plate on the side of the mining area is 15-30 degrees, the distance between every two adjacent splitting holes 3 is 0.6-1 m, the hole depth is 6-8 m, the hole diameter is not less than 90mm, and the distance, the inclination angle and the length of each splitting hole 3 are the same;
step four: selecting a splitting hole 3 with a certain distance from a lagging coal face, and installing three column type splitters 6 in the splitting hole 3, wherein the three column type splitters 6 are connected in series, and column heads 7 of the column type splitters face to the goaf side;
step five: taking the splitting holes 3 selected in the fourth step as starting points, sequentially selecting four splitting holes 3 according to the direction far away from the coal face, installing three column type splitters 6 in the splitting holes 3, connecting the column type splitters 6 in the same splitting hole 3 in series, enabling column heads 7 of the column type splitters to face the goaf side, and connecting the column type splitters 6 in the adjacent splitting holes 3 in parallel; the other steps were the same as in example 1.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (4)
1. A coal mine roadside filling gob-side entry retaining hydraulic fracturing top-cutting method is characterized by comprising the following steps:
the method comprises the following steps: drilling holes in the front of an end support of a coal seam working surface, installing anchor rods and anchor cables, and after coal is mined on the coal seam working surface, installing two rows of single hydraulic struts on one side of a mined-out area of a region to be filled to construct a temporary support;
step two: installing a template in the area to be filled, conveying the filling slurry into the template by using pulping and conveying equipment, and forming a filling body (2) after the filling slurry is solidified;
step three: after an end support (1) of a coal seam working face is moved, a row of inclined split holes (3) are punched in a top plate on the goaf side of the edge of a filling body (2), and the spacing, the inclination angle and the length of the split holes (3) are the same;
step four: selecting a splitting hole (3) with a certain distance from a lagging coal face, and installing a column type splitter (6) in the splitting hole (3), wherein column heads (7) of the column type splitter face towards the goaf side;
step five: taking the selected cleavage holes (3) in the fourth step as starting points, sequentially selecting at least two cleavage holes (3) according to the direction far away from the coal face, installing column type cleavers (6) on the cleavage holes (3), and connecting the column type cleavers (6) installed in different cleavage holes (3) in parallel;
step six: starting a hydraulic source (4), supplying liquid to a column type splitter (6) through a hydraulic conveying pipeline (5) to generate pressure, and enabling a column type splitter column head (7) to apply in-hole tension to a gob-side entry retaining top layer, so that cracks are generated between splitting holes (3) and are continuously expanded, finally, the adjacent splitting holes (3) are communicated, and coal stones on the outer layer of a top plate are split;
step seven: releasing pressure of the column type splitter (6), installing the column type splitter (6) in the middle of the splitting hole (3), repeating the steps from one step to six, and splitting the coal stone on the middle layer of the top plate;
step eight: releasing pressure of the column type splitter (6), installing the column type splitter (6) at the lower part of the splitting hole (3), repeating the steps from one step to six, and splitting coal stones at the bottom layer of the top plate;
step nine: after the splitting is completed, recovering the single hydraulic prop in the split area;
step ten: repeating the steps from one to nine until the roof splitting project of the whole gob-side entry retaining is completed;
in the third step, the included angle between the cleavage holes (3) and the perpendicular line of the plane of the top plate at the goaf side is 15-30 degrees, the distance between the adjacent cleavage holes (3) is 0.6-1 m, the hole depth is 6-8 m, and the hole diameter is not less than 90 mm;
in the fourth step, 1-3 column type splitters (6) can be simultaneously installed in the same splitting hole (3), and the column type splitters (6) are connected in series;
in the sixth step, incompressible liquid is supplied to the column type splitter (6) through the hydraulic conveying pipeline (5).
2. The coal mine roadside packing gob-side entry retaining hydraulic splitting roof cutting method of claim 1, characterized in that: in the second step, the template can be replaced by a flexible filling mold bag.
3. The coal mine roadside packing gob-side entry retaining hydraulic splitting roof cutting method of claim 1, characterized in that: in the fourth step, the distance range of the lagging coal mining working face is 15-20 m.
4. The coal mine roadside packing gob-side entry retaining hydraulic splitting roof cutting method of claim 1, characterized in that: in the fifth step, the number of the splitting holes (3) for simultaneously splitting is 2-4.
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| CN201810069139.XA CN108457651B (en) | 2018-01-24 | 2018-01-24 | Coal mine roadside filling gob-side entry retaining hydraulic splitting roof cutting method |
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| CN201810069139.XA CN108457651B (en) | 2018-01-24 | 2018-01-24 | Coal mine roadside filling gob-side entry retaining hydraulic splitting roof cutting method |
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| CN108457651B true CN108457651B (en) | 2020-04-03 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109139014B (en) * | 2018-10-29 | 2020-03-10 | 六盘水师范学院 | Perforation presplitting roof cutting gob-side entry retaining method |
| CN109372508B (en) * | 2018-12-18 | 2024-03-12 | 中煤能源研究院有限责任公司 | Underground hydraulic directional roof cutting equipment for coal mine and construction method thereof |
| CN109458214B (en) * | 2018-12-19 | 2020-01-31 | 河南理工大学 | static blasting permeability-increasing gas extraction method for low-permeability coal seam |
| CN110173264B (en) * | 2019-06-13 | 2021-04-27 | 山东科技大学 | Method for preventing and treating hard roof roadway rock burst through roof breakage and conventional pressure relief |
| CN110439560A (en) * | 2019-07-31 | 2019-11-12 | 四川华蓥山龙滩煤电有限责任公司 | A kind of construction technology of medium-thickness seam coal working face along the lane Kong Hu |
| CN111173512B (en) * | 2020-01-17 | 2021-05-04 | 中北大学 | Gob-side entry retaining method for retained half lane |
| CN112727459B (en) * | 2020-12-25 | 2022-05-17 | 中国矿业大学 | Mining method for reducing mining influence of shallow coal seam |
| CN116464444B (en) * | 2023-03-23 | 2024-01-19 | 中国矿业大学(北京) | Mechanical non-blasting net surface drilling expansion roof cutting pressure relief method |
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