AU2022446293A1 - Method for preventing and controlling rock burst from source by fracturing roof region of coal mine - Google Patents
Method for preventing and controlling rock burst from source by fracturing roof region of coal mine Download PDFInfo
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- AU2022446293A1 AU2022446293A1 AU2022446293A AU2022446293A AU2022446293A1 AU 2022446293 A1 AU2022446293 A1 AU 2022446293A1 AU 2022446293 A AU2022446293 A AU 2022446293A AU 2022446293 A AU2022446293 A AU 2022446293A AU 2022446293 A1 AU2022446293 A1 AU 2022446293A1
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- roadway
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- working face
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000011435 rock Substances 0.000 title claims abstract description 25
- 239000003245 coal Substances 0.000 title claims abstract description 24
- 238000005065 mining Methods 0.000 claims abstract description 90
- 238000010586 diagram Methods 0.000 claims description 6
- 238000005553 drilling Methods 0.000 claims description 3
- 230000002265 prevention Effects 0.000 description 3
- 230000009172 bursting Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21C37/12—Other methods or devices for dislodging with or without loading by making use of hydraulic or pneumatic pressure in a borehole by injecting into the borehole a liquid, either initially at high pressure or subsequently subjected to high pressure, e.g. by pulses, by explosive cartridges acting on the liquid
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The present discloses provides a method for preventing and controlling rock burst from source
by fracturing a roof region of a coal mine, including: determining a roof fracturing target layer and
a location thereof, in which the roof fracturing target layer includes a development roadway roof of
5 a development roadway, a preparation roadway roof of a preparation roadway and a mining working
face roof of a mining working face; fracturing the development roadway roof and tunnel-boring;
fracturing the preparation roadway roof and tunnel-boring; and fracturing the mining working face
roof, tunnel-boring and coal-mining.
Description
This application claims priority to and benefits of Chinese Patent Application No.
202210926215.0, filed with the China National Intellectual Property Administration on August 3,
2022, the contents of which are incorporated herein by reference in their entireties for all purposes.
D The present disclosure relates to a technical field of coal mining, and more particularly to a
method for preventing and controlling rock burst from source by fracturing a roof region of a coal
mine.
Occurrence of the rock burst in the mine region is closely related to a hard roof overlying on a
coal seam, which provides a static load when it hangs and does not collapse, and provides a dynamic
load when it suddenly breaks. The rock burst mostly occurs during a protection process of a local
pressure relief for a local work face to be bored and mined, and construction workers are exposed to
the bursting danger, which may cause casualties when the rock burst occurs. At present, it is difficult
D to accurately predict the occurrence of the rock burst, but the dynamic and static load sources that
induce the rock burst can be accurately located.
Before roadway-boring and working face-mining, a thick and hard roof that provides a power
source for activating the burst is used as a target, and ground regional fracture is performed for the
roof of the coal seam to be bored and mined, relating to the whole process of development,
preparation, and mining. Processes of "fracturing before tunneling", "fracturing before mining",
preparing a protective coal seam, reducing the primary rock stress level and tectonic stress level of
the to-be-bored and mined roadway region, so that the to-be-bored and mined roadway region is in
a pressure relief protection zone to realize the method for preventing and controlling the rock burst
from the source. At present, it is difficult for the existing local pressure relief methods to effectively
D solve the problem of bursting disasters.
The present disclosure has an object of providing a method for preventing and controlling rock
burst from source by fracturing a roof region of a coal mine, which is capable of solving the problems
that rock burst disasters in the coal mine are severe and it is difficult for the existing local pressure
relief methods to effectively eliminate the rock burst disasters.
The method for preventing and controlling the rock burst from the source by fracturing the roof
region of the coal mine provided in the present disclosure includes:
determining a roof fracturing target layer and a location thereof, in which the roof fracturing
target layer includes a development roadway roof of a development roadway, a preparation roadway
D roof of a preparation roadway and a mining working face roof of a mining working face;
fracturing the development roadway roof and tunnel-boring;
fracturing the preparation roadway roof and tunnel-boring; and
fracturing the mining working face roof, tunnel-boring and coal-mining.
Optionally, determining the roof fracturing target layer and the location thereof includes:
determining thick and hard roofs overlying on the development roadway, the preparation
roadway, and the mining working face as fracturing regions according to a layout of the roadways
and the working face and a drilling column diagram;
setting the thick and hard roofs above a region of the development roadway and a region of the
preparation roadway to form the development roadway roof and the preparation roadway roof,
D respectively, and determining the development roadway roof and the preparation roadway roof as a
roof fracturing target layer of a to-be-bored roadway region; and
setting the thick and hard roof above a region of the mining working face to form the mining
working face roof, and determining the mining working face roof as a roof fracturing target layer of
a working face region.
Optionally, the roof fracturing target layer of the to-be-bored roadway region is a sandstone
layer having a thickness of 10 m and located 40 m above a coal seam.
Optionally, the roof fracturing target layer of the working face region is a sandstone layer
having a thickness of 10 m and located 50 m above a coal seam.
Optionally, fracturing the development roadway roof and tunnel-boring includes:
D determining arrangement and trend of a ground horizontal well for the development roadway
roof according to a designed spacing and length of the development roadway; designing a fracturing range of the development roadway roof in such a way that the fracturing range of the development roadway roof covers a boring region of the development roadway to avoid an existence of a pre-fracturing blind region; and implementing a ground hydraulic fracturing on the roof above the region of the development roadway until generating fracturing cracks, constructing of a shaft, and performing tunnel-boring on the boring region covered by the fracturing range of the development roadway roof to form the development roadway.
Optionally, fracturing the preparation roadway roof and tunnel-boring includes:
determining arrangement and trend of a ground horizontal well for the preparation roadway
D roof according to a designed spacing and length of the preparation roadway;
designing a fracturing range of the preparation roadway roof in such a way that the fracturing
range of the preparation roadway roof covers a boring region of the preparation roadway to avoid
an existence of a pre-fracturing blind region; and
implementing a ground hydraulic fracturing on the roof above a region of the preparation
roadway until generating fracturing cracks, and performing tunnel-boring on the boring region
covered by the fracturing range of the preparation roadway roof to form the preparation roadway.
Optionally, fracturing the mining working face roof, tunnel-boring and coal-mining includes:
determining arrangement and trend of a ground horizontal well for the mining working face
roof according to a designed strike length and dip length of the mining working face;
D designing a fracturing range of the mining working face roof in such a way that the fracturing
range of the mining working face roof covers a mining region of the mining working face to avoid
an existence of a pre-fracturing blind region; and
implementing a ground hydraulic fracturing on the roof above the region of the mining working
face until generating fracturing cracks, performing tunnel-boring on the mining region covered by
the fracturing range of the mining working face roof to form the mining working face, and carrying
out the mining.
Optionally, the region of the development roadway is located below the shaft and transversely
passes through the shaft, and the region of the development roadway is connected to the region of
the mining working face by the region of the preparation roadway.
D Optionally, the region of the development roadway includes a plurality of parallel development
roadways, the spacing between adjacent development roadways is 40 m and the designed length of each development roadway is 4000 m.
Optionally, the region of the preparation roadway includes a plurality of parallel preparation
roadways, the spacing between adjacent preparation roadways is 35 m and the designed length of
each preparation roadway is 3000 m.
Optionally, the mining working face has the dip length of 200 m and the strike length of 2000
m.
Compared with the existing technology, the present disclosure has the following beneficial
effects.
With the method for preventing and controlling the rock burst from the source by fracturing the
D roof region of the coal mine of the present disclosure, pre-fracturing is performed on the roof regions
above regions where the development roadway, the preparation roadway and the mining working
face are located, e.g., by adopting the ground hydraulic fracturing, so that the thick and hard roofs
overlying on the boring roadway and the mining work face are weakened, the primary rock stress
level and tectonic stress level of the roadway to be bored and the region to be mined can be reduced
actively, in advance and from the source. The roadway boring and the coal mining can be performed
within the range where the roof is fractured, and the roadways and the working face are low stress
regions during the tunnel boring and the mining, and thus are in the protected state. In this way, the
roadway boring and the coal mining can be realized safely, relating to the whole process of
development, preparation and mining, thus realizing the prevention and control of the rock burst
D from the source.
FIG. 1 is a schematic diagram illustrating fracturing a development roadway roof before boring
a development roadway according to embodiments of the present disclosure;
FIG. 2 is a schematic diagram illustrating fracturing a preparation roadway roof before boring
a preparation roadway according to embodiments of the present disclosure;
FIG. 3 is a schematic diagram illustrating fracturing a mining working face roof before mining
a mining working face according to embodiments of the present disclosure.
Reference numerals:
D 1 - shaft, 2 - development roadway, 3 - preparation roadway, 4 - mining working face, 50
fracturing cracks, 51 - development roadway roof, 52 - preparation roadway roof, 53 - mining working face roof.
The following embodiments are used to generally understand the present disclosure, but shall
not be construed to limit the present disclosure.
Embodiments of the present disclosure provide a method for preventing and controlling rock
burst from source by fracturing a roof region of a coal mine. Normally, the prevention and control
of the rock burst is performed passively. In order to solve the problems that the rock burst disasters
in the coal mine are severe and it is difficult for the existing local pressure relief methods to
D effectively eliminate the rock burst disasters, ground hydraulic fracturing is performed on the thick
and hard roofs overlying on a development roadway, a preparation roadway and a mining working
face, so that the thick and hard roofs overlying on the roadways to be bored and the mining work
face 4 can be weakened, the primary rock stress level and tectonic stress level of the roadway to be
bored and the region to be mined can be reduced actively, in advance, and from the source, thus
making the roadways and the working faces be low stress regions. In this way, safe tunnel-boring
for the development roadway 2 and the preparation roadway 3, and safe mining for the mining
working face 4 can be realized, thus realizing the prevention and control of the rock burst from the
source.
The method for preventing and controlling the rock burst from the source by fracturing the roof
D region of the coal mine provided in the present disclosure is described in detail with reference to
FIGS. 1 to 3. The method includes the following steps.
In Step A, a roof fracturing target layer and a location thereof are determined, in which the roof
fracturing target layer includes a development roadway roof 51, a preparation roadway roof 52 and
a mining working face roof 53.
In Step Al, thick and hard roofs overlying on the development roadway 2, the preparation
roadway 3, and the mining working face 4 are determined as fracturing regions according to a layout
of the roadways and the working face and a drilling column diagram.
Specifically, referring to FIGS. I to 3, a region of the development roadway 2 is located below
the shaft 1 and transversely passes through the shaft 1, and the region of the development roadway
D 2 is communicated to a region of the mining working face 4 through a region of the preparation
roadway 3.
The region of the development roadway 2 includes three parallel development roadways 2, a
spacing between adjacent development roadways 2 is 40 m and a designed length of each
development roadway 2 is 4000 m.
The region of the preparation roadway 3 includes three parallel preparation roadways 3, a
spacing between adjacent preparation roadways 3 is 35 m and a designed length of each preparation
roadway 3 is 3000 m.
The region of the development roadway 2 and the region of the preparation roadway 3 are to
be-bored roadway regions.
The mining working face 4 has a dip length of 200 m and a strike length of 2000 m.
D A region of the mining working face 4 is a to-be-mined region.
In Step A2, the thick and hard roofs above the region of the development roadway 2 and the
region of the preparation roadway 3 are set as the development roadway roof 51 and the preparation
roadway roof 52, respectively; the development roadway roof 51 and the preparation roadway roof
52 are determined as a roof fracturing target layer of a to-be-bored roadway region, and the roof
fracturing target layer of the to-be-bored roadway region is a sandstone layer having a thickness of
10 m and located 40 m above a coal seam; the thick and hard roof above the region of the mining
working face 4 is set as the mining working face roof 53, the mining working face roof 53 is
determined as a roof fracturing target layer of a working face region, and the roof fracturing target
layer of the working face region is a sandstone layer having a thickness of 10 m and located 50 m
D above a coal seam.
In Step B, the development roadway roof 51 is fractured and tunnel-boring is performed, as
shown in FIG. 1.
In Step B1, arrangement and trend of a ground horizontal well for the development roadway
roof 51 are determined according to a designed spacing and length of the development roadway 2.
Specifically, the number of the ground horizontal wells is determined to be four, and the ground
horizontal wells are arranged along a trend direction of the development roadway 2.
In Step B2, a fracturing range of the development roadway roof 51 is designed in such a way
that the fracturing range of the development roadway roof 51 covers a boring region of the
development roadway 2 to avoid an existence of a pre-fracturing blind region.
D In Step B3, fracturing is implemented on the roof above the region of the development roadway
2 until fracturing cracks 50 are generated, a shaft 1 is constructed, and the development roadway 2 is formed by performing tunnel-boring on the boring region covered by the fracturing range of the development roadway roof 51.
In Step C, the preparation roadway roof 52 is fractured and tunnel-boring is performed, as
shown in FIG. 2.
In Step C1, arrangement and trend of a ground horizontal well for the preparation roadway roof
52 are determined according to a designed spacing and length of the preparation roadway 3.
Specifically, the number of the ground horizontal wells is determined to be three, and the
ground horizontal wells are arranged along a trend direction of the preparation roadway 3.
In Step C2, a fracturing range of the preparation roadway roof 52 is designed in such a way that
) the fracturing range of the preparation roadway roof 52 covers a boring region of the preparation
roadway 3 to avoid an existence of a pre-fracturing blind region.
In Step C3, a fracturing is performed on the roof above a region of the preparation roadway 3
until fracturing cracks 50 are generated, and the preparation roadway 3 is formed by performing
tunnel-boring on the boring region covered by the fracturing range of the preparation roadway roof
52.
In Step D, the mining working face roof 53 is fractured, and coal-mining is carried out, as
shown in FIG. 3.
In Step D1, arrangement and trend of a ground horizontal well for the mining working face roof
53 are determined according to a designed strike length and dip length of the mining working face
) 4.
Specifically, the number of the ground horizontal wells is determined to be two, the ground
horizontal wells may be arranged along a trend direction of the mining working face 4.
In Step D2, a fracturing range of the mining working face roof 53 is designed in such a way
that the fracturing range of the mining working face roof 53 covers a mining region of the mining
working face 4 to avoid an existence of a pre-fracturing blind region.
In Step D3, a fracturing is implemented on the roof above the region of the mining working
face 4 until fracturing cracks 50 are generated, the mining working face 4 is formed by performing
tunnel-boring on the mining region covered by the fracturing range, and the mining is carried out.
Although the present disclosure has been described in detail with general descriptions and
) specific examples above, it would be appreciated by those skilled in the art that changes or
modifications can be made on the basis of the present disclosure. Therefore, the changes or modifications made without departing from the spirit of the present disclosure all belong to the protection scope of the present disclosure.
Claims (11)
1. A method for preventing and controlling rock burst from source by fracturing a roof region
of a coal mine, comprising:
determining a roof fracturing target layer and a location thereof, wherein the roof fracturing
target layer comprises a development roadway roof (51) of a development roadway (2), a preparation
roadway roof (52) of a preparation roadway (3) and a mining working face roof (53) of a mining
working face (4);
fracturing the development roadway roof (51) and tunnel-boring;
D fracturing the preparation roadway roof (52) and tunnel-boring; and
fracturing the mining working face roof (53), tunnel-boring and coal-mining.
2. The method according to claim 1, wherein determining the roof fracturing target layer and
the location thereof comprises:
determining thick and hard roofs overlying on the development roadway (2), the preparation
roadway (3), and the mining working face (4) as fracturing regions according to a layout of the
roadways and the working face and a drilling column diagram;
setting the thick and hard roofs above a region of the development roadway (2) and a region of
the preparation roadway (3) to form the development roadway roof (51) and the preparation roadway
roof (52), respectively, and determining the development roadway roof (51) and the preparation
D roadway roof (52) as a roof fracturing target layer of a to-be-bored roadway region; and
setting the thick and hard roof above a region of the mining working face (4) to form the mining
working face roof (53), and determining the mining working face roof (53) as a roof fracturing target
layer of a working face region.
3. The method according to claim 2, wherein the roof fracturing target layer of the to-be-bored
roadway region is a sandstone layer having a thickness of 10 m and located 40 m above a coal seam.
4. The method according to claim 2 or 3, wherein the roof fracturing target layer of the working
face region is a sandstone layer having a thickness of 10 m and located 50 m above a coal seam.
5. The method according to any one of claims 1 to 4, wherein fracturing the development
roadway roof (51) and tunnel-boring comprises:
D determining arrangement and trend of a ground horizontal well for the development roadway
roof (51) according to a designed spacing and length of the development roadway (2); designing a fracturing range of the development roadway roof (51) in such a way that the fracturing range of the development roadway roof (51) covers a boring region of the development roadway (2) to avoid an existence of a pre-fracturing blind region; and implementing a ground hydraulic fracturing on the roof above the region of the development roadway (2) until generating fracturing cracks (50), constructing a shaft (1), and performing tunnel boring on the boring region covered by the fracturing range of the development roadway roof (51) to form the development roadway (2).
6. The method according to any one of claims 1 to 5, wherein fracturing the preparation
roadway roof (52) and tunnel-boring comprises:
D determining arrangement and trend of a ground horizontal well for the preparation roadway
roof (52) according to a designed spacing and length of the preparation roadway (3);
designing a fracturing range of the preparation roadway roof (52) in such a way that the
fracturing range of the preparation roadway roof (52) covers a boring region of the preparation
roadway (3) to avoid an existence of a pre-fracturing blind region; and
implementing a ground hydraulic fracturing on the roof above a region of the preparation
roadway (3) until generating fracturing cracks (50), and perform tunnel-boring on the boring region
covered by the fracturing range of the preparation roadway roof (52) to form the preparation roadway
(3).
7. The method according to any one of claims 1 to 6, wherein fracturing the mining working
D face roof (53), tunnel-boring and coal-mining comprises:
determining arrangement and trend of a ground horizontal well for the mining working face
roof (53) according to a designed strike length and dip length of the mining working face (4);
designing a fracturing range of the mining working face roof (53) in such a way that the
fracturing range of the mining working face roof (53) covers a mining region of the mining working
face (4) to avoid an existence of a pre-fracturing blind region; and
implementing a ground hydraulic fracturing on the roof above the region of the mining working
face (4) until generating fracturing cracks (50), performing tunnel-boring on the mining region
covered by the fracturing range of the mining working face roof (53) to form the mining working
face (4), and carrying out the mining.
D
8. The method according to any one of claims 1 to 7, wherein a region of the development
roadway (2) is located below the shaft (1) and transversely passes through the shaft (1), and the region of the development roadway (2) is communicated to a region of the mining working face (4) by a region of the preparation roadway (2).
9. The method according to any one of claims 1 to 8, wherein a region of the development
roadway (2) comprises a plurality of parallel development roadways (2), a spacing between adjacent
development roadways (2) is 40 m and a designed length of each development roadway (2) is 4000
m.
10. The method according to any one of claims 1 to 9, wherein a region of the preparation
roadway (3) comprises a plurality of parallel preparation roadways (3), a spacing between adjacent
preparation roadways (3) is 35 m and a designed length of each preparation roadway (3) is 3000 m.
D
11. The method according to any one of claims 1 to 10, wherein the mining working face (4)
has a dip length of 200 m and a strike length of 2000 m.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210926215.0 | 2022-08-03 | ||
| CN202210926215.0A CN115288681A (en) | 2022-08-03 | 2022-08-03 | Method for preventing rock burst at fracture source in coal mine roof area |
| PCT/CN2022/128959 WO2024027030A1 (en) | 2022-08-03 | 2022-11-01 | Method for preventing and controlling rock burst at source by means of coal mine roof area fracturing |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2022446293A1 true AU2022446293A1 (en) | 2024-02-22 |
Family
ID=83826490
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2022446293A Pending AU2022446293A1 (en) | 2022-08-03 | 2022-11-01 | Method for preventing and controlling rock burst from source by fracturing roof region of coal mine |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN115288681A (en) |
| AU (1) | AU2022446293A1 (en) |
| WO (1) | WO2024027030A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116049964B (en) * | 2023-02-08 | 2024-02-13 | 中煤科工开采研究院有限公司 | Anti-impact method for artificial liberation layer of newly-built mine |
| CN116167223B (en) * | 2023-02-08 | 2024-02-13 | 中煤科工开采研究院有限公司 | Method for determining artificial liberation layer |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU836364A1 (en) * | 1979-07-26 | 1981-06-07 | Институт Горной Механики Им. Г.А.Цулукидзе Ah Грузинской Ccp | Method of preventing dynamic phenomena at working of coal beds |
| CN109736805A (en) * | 2018-12-12 | 2019-05-10 | 天地科技股份有限公司 | A kind of method of the modified release watershed management bump of thick-layer tight roof |
| CN111305876A (en) * | 2020-03-27 | 2020-06-19 | 天地科技股份有限公司 | Deep roadway anchoring-splitting grouting-hydraulic fracturing pressure relief cooperative control method |
| CN113236360A (en) * | 2021-06-29 | 2021-08-10 | 中煤科工开采研究院有限公司 | Method for preventing and controlling exploding roadway group rock burst |
| CN113404535B (en) * | 2021-07-07 | 2023-05-02 | 陕西彬长孟村矿业有限公司 | Method for preventing rock burst by hydraulic fracturing of coal mine underground |
| CN114837662B (en) * | 2022-04-22 | 2022-11-11 | 山东科技大学 | Unloading-splitting-support cooperative scour prevention method based on coal body pressure relief and roof pre-splitting |
-
2022
- 2022-08-03 CN CN202210926215.0A patent/CN115288681A/en active Pending
- 2022-11-01 AU AU2022446293A patent/AU2022446293A1/en active Pending
- 2022-11-01 WO PCT/CN2022/128959 patent/WO2024027030A1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CN115288681A (en) | 2022-11-04 |
| WO2024027030A1 (en) | 2024-02-08 |
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