AU2021106168A4 - High-gas Coal Seam Group Pressure Relief Mining Method Based on Gob-side Entry Retaining in the First Mining Whole Rock Pressure Relief Working Face - Google Patents
High-gas Coal Seam Group Pressure Relief Mining Method Based on Gob-side Entry Retaining in the First Mining Whole Rock Pressure Relief Working Face Download PDFInfo
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- AU2021106168A4 AU2021106168A4 AU2021106168A AU2021106168A AU2021106168A4 AU 2021106168 A4 AU2021106168 A4 AU 2021106168A4 AU 2021106168 A AU2021106168 A AU 2021106168A AU 2021106168 A AU2021106168 A AU 2021106168A AU 2021106168 A4 AU2021106168 A4 AU 2021106168A4
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- pressure relief
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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
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
-
- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/006—Production of coal-bed methane
-
- 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
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
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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)
- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The invention discloses a high-gas coal seam group pressure relief mining method based on
gob-side entry retaining in the first mining whole rock pressure relief working face. When the
first mining whole rock pressure relief working face cannot be selected, the coal-series strata
are moved and destroyed through the first mining whole rock pressure relief working face; the
overlying high-gas coal seam and the underlying high-gas coal seam are pressure-relieved and
expanded which results in development of cracks of the surrounding rock, increased gas
permeability and desorption and migration of gas, and finally a roof pressure relief crack ring
and a floor pressure relief crack ring are generated. In order to create a favourable stress
environment of surrounding rock in retaining roadway, the drilling field is excavated in the
advanced working face, and roof cantilever at goaf side of retaining roadway is carried out in
both directions towards and away from the working face, and the roof deep hole presplitting
caving is carried out in the advanced working face according to the lithologic characteristics of
roof strata to ensure that it fully collapsed and filled the goaf. The method solves the
outstanding problem of pressure relief gas drainage and safe mining of the coal seam group
when it is difficult to select the pressure relief coal seam in the first mining of the high-gas coal
seam group.
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Description
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High-gas Coal Seam Group Pressure Relief Mining Method Based on Gob-side
Entry Retaining in the First Mining Whole Rock Pressure Relief Working Face
The invention relates to a mining method of high-gas coal seam group in coal mine, in
particular to a method for draining pressure relief gas of high-gas coal seam group
through gob-side entry retaining in the first mining whole rock pressure relief working
face so as to realize safe and efficient mining of high-gas coal seam group.
The geological conditions of major coal fields in China are complex, with high gas
content and low permeability in coal seam. Practice shows that once the coal seam is
disturbed by mining, even the coal seam with low permeability will increase its
permeability by tens to hundreds of times, creating conditions for gas migration and
drainage. This determines that the focus of gas drainage in China should be active
pressure relief drainage by underground mining.
In the invention patent application with the application number of 200810023383.9, the
inventor proposed a technical scheme of "Y-type ventilation and pressure relief gas
drainage method for gob-side entry retaining in high gas coal seam mining". The purpose
of this technical scheme is to solve the problems of mining and effective utilization of gas
in high-gas coal seam group. Through roof pressure relief crack ring and floor pressure
relief crack ring produced by coal seam movement caused by the first mining of pressure
relief coal seam, desorption free gas is extracted by arranging gas drainage drilling holes
for upward roof pressure relief crack ring and gas drainage drilling holes for downward floor pressure relief crack ring in gob-side entry retaining. Although the method can well solve the mining problem of the high-gas coal seam group when the high-gas coal seam group has a suitable first mining pressure relief coal seam, the scheme is difficult to apply when the high-gas coal seam group does not have a suitable first mining pressure relief coal seam layout. Especially when pumping and discharging the gas in the first mining high-gas coal seam, the efficiency is low, the gas pumping and discharging is not complete, and it can not reach below the safety value, which is prone to gas explosion or coal and gas outburst and other vicious accidents, and there are huge potential safety hazards. Therefore, under the engineering conditions above, the mining problem of high gas coal seam group has not been well solved.
The purpose of the invention is to overcome the defects in the prior art, and the invention
provides a method for pressure relief mining of high-gas coal seam groups based on gob
side entry retaining in the first mining whole rock pressure relief working face, which
realizes safe mining through the first mining whole rock pressure relief working face
when it is difficult to select the first mining pressure relief coal seam of high-gas coal
seam groups.
Technical scheme: in order to achieve the purpose above, the technical scheme adopted
by the invention is as follows:
The invention relates to a high-gas coal seam group pressure relief mining method based
on gob-side entry retaining of first mining whole rock pressure relief working face, which
comprises the following steps: when the first mining pressure relief coal seam cannot be
selected, the coal-series strata are moved and destroyed through the first mining whole rock pressure relief working face to generate roof pressure relief crack ring and floor pressure relief crack ring; the overlying high gas coal seam and the underlying high gas coal seam are depressurized and expanded, the surrounding rock crack develops; the gas permeability is increased and desorbed, and the roof pressure relief crack ring and the floor pressure relief crack ring are formed, and gas drainage drilling holes for upward roof pressure relief crack ring and downward floor pressure relief crack ring in gob-side entry retaining are respectively arranged to drain desorbed free gas; when first mining whole rock pressure relief working face can't be selected(or it is difficult to select in occasions where vertical distance between adjacent coal seams are too large and high gas outburst coal seam group does not meet the mining conditions), the coal-series strata are moved and destroyed through the first mining whole rock pressure relief working face; the overlying high-gas coal seam and the underlying high-gas coal seam are pressure relieved and expanded; the surrounding rock crack develop; the gas permeability increases and desorbs and migrates, and finally a roof pressure relief crack ring and a floor pressure relief crack ring are generated.
The specific methods for the coal seam movement and destruction caused by the first
mining of the full- rock pressure relief working face and corresponding technical scheme
are as follows: the drilling field is excavated in the advanced full- rock working face, and
the top cutting drilling up against the working face and the top cutting drilling back
against the working face are set in the drilling field to shorten the length of roof
cantilever in goaf, optimize the stress environment and control the deformation of gob
side entry retaining; according to the lithologic characteristics of overlying roof strata,
caving drilling is set up in the advanced full- rock working face, and deep-hole presplitting blasting is carried out on the caving drilling to ensure that the roof fully collapses and fills the goaf; at the same time, a filling wall is built at the goaf side of the whole rock working face to realize gob-side entry retaining.
Specifically, in the high-gas coal seam group, the vertical distance between any adjacent
coal seam is 50-150m; when selecting the first mining whole rock pressure relief
working face, the surrounding rock structure, roof caving and floor pressure relief
characteristics should be fully considered, and the vertical distance between the first
mining whole rock pressure relief working face and the overlying high gas coal seam
(overlying pre-pressure relief coal seam) is 30-90 m and the vertical distance between the
first mining whole rock pressure relief working face and the underlying high gas coal
seam (underlying pre-pressure relief coal seam) is 20-60 m.
Specifically, when selecting the first mining whole rock pressure relief working face, it is
required that the rock hardness Platts coefficient of the first mining whole rock pressure
relief working face is f<7; the working face layout length is 150-250 m; the advancing
length is 1000-2500 m; the rock mining height is 1.3-3.5 m, and the working face
inclination angle is <20° .
Compared with the prior art, the high-gas coal seam group pressure relief mining method
based on gob-side entry retaining of the first mining whole rock pressure relief working
face has the following advantages: 1. when the first mining pressure relief coal seam
cannot be selected, the coal-series strata are moved and destroyed through the first
mining whole rock pressure relief working face, which can be used in a wider range and
the selection of the pressure relief layer is more flexible; 2. The outstanding problem of
selecting protective layer and safe mining of coal seam group is completely solved when it is difficult to select pressure relief coal seam in the first mining of high gas coal seam group; 3. The scope of pressure relief in this case is large, and through proper mining height, the coal seam above 90 m and the coal seam below 60 m can be fully depressurized to extract gas; 4. On the basis of analysing the movement characteristics of surrounding rock structure in gob-side entry retaining, this case puts forward a roof control method to promote full pressure relief in gob-side entry retaining. Pre-splitting drilling is used to fully loosen the hard roof strata outside the filling wall, so that the hard roof is broken outside the filling wall, eliminating the influence of large-span overhanging roof and its rotary subsidence on surrounding rock in gob-side entry retaining, fundamentally relieving the surrounding rock pressure in gob-side entry retaining, optimizing the stress field in gob-side entry retaining area, and reducing the action time of overlying strata on surrounding rock. 5. This case has strong feasibility and simple process; the existing fully mechanized mining equipment such as shearer, hydraulic support and scraper conveyor can meet the needs of comprehensive mechanized mining in rock working face with relatively low strength.
Figure 1 is a schematic diagram of high-gas coal seam group pressure relief mining
method based on gob-side entry retaining in the first mining whole rock pressure relief
working face;
Figure 2 is a schematic diagram of the arrangement of top cutting drilling and top caving
drilling according to the present invention;
Figure 3 is a cross-sectional view of the arrangement of top cutting drilling holes along
goaf of the present invention;
Figure 4 is a cross-sectional view of the arrangement of top caving drilling holes of whole
rock working face of the present invention;
In the drawing: 1- overlying high-gas coal seam, 2- first mining pressure relief rock
stratum, 3- underlying high-gas coal seam, 4- track lane of whole rock pressure relief
working face, 5- filling wall, 6- pressure relief line, 7- broken line, 8- goaf of whole rock
pressure relief working face, 9- gas drainage drilling for upward roof pressure relief crack
ring, and 10- gas drainage drilling for downward floor pressure relief crack ring, 11
transportation lane of whole rock pressure relief working face, 12- drilling field, 13- top
cutting drilling back against working face, 14- top cutting drilling up against working
face, 15- caving drilling, 16- first mining whole rock pressure relief working face.
The present invention will be further explained with reference to the accompanying
drawings.
The high-gas coal seam group pressure relief mining method based on gob-side entry
retaining of first mining whole rock pressure relief working face is achieved by following
steps: coal-series strata are moved and destroyed through first mining whole rock
pressure relief working face to generate roof pressure relief crack ring and floor pressure
relief crack ring; upward roof pressure relief crack ring drilling holes and downward floor
pressure relief crack ring drilling holes are respectively arranged for gas drainage; when
first mining pressure relief coal seam can't be selected, the coal-series strata are moved
and destroyed through the first mining whole rock pressure relief working face.
Consequently, the overlying coal strata and the underlying coal strata are pressure
relieved and expanded, resulting in development of rock crack, the increased gas permeability and desorption and migration of gas, and finally a roof pressure relief crack ring and a floor pressure relief crack ring are generated To be specific, it is achieved through the strata movement and destruction based on the first mining whole rock pressure relief working face with gob-side entry retaining. The specific methods for the strata movement and destruction caused by the first mining of the whole rock pressure relief working face and corresponding technical scheme are as follows: the drilling field is excavated in the advanced full- rock working face, and the top cutting drilling up against working face and the top cutting drilling back against the working face are set in the drilling field to shorten the length of roof cantilever in goaf, optimize the stress environment and control the deformation of gob-side entry retaining; according to the lithologic characteristics of overlying roof strata, caving drilling is set up in the advanced whole rock working face, and deep-hole presplitting blasting is carried out on the caving drilling to ensure that the roof fully collapses and fills the goaf; at the same time, a filling wall is built at the goaf side of the whole rock working face to realize gob-side entry retaining.
Specifically, in the high-gas coal seam group, the vertical distance between any adjacent
coal seam is 50-150 m; when selecting the first mining whole rock pressure relief
working face, the surrounding rock structure, roof caving and floor pressure relief
characteristics should be fully considered, and the vertical distance between the first
mining whole rock pressure relief working face and the overlying pre-pressure relief coal
seam is 30-90 m and the vertical distance between the first mining whole rock pressure
relief working face and underlying pre-pressure relief coal seam is 20-60 m.
Specifically, when selecting the first mining whole rock pressure relief working face, it is
required that the rock hardness Platts coefficient of the first mining whole rock pressure
relief working face is f<7; the working face layout length is 150-250 m; the advancing
length is 1000-2500 m; the rock mining height is 1.3-3.5 m, and the working face
inclination angle is <20°
. The implementation process of the present invention will be further explained with
examples below.
The invention relates to a high-gas coal seam group pressure relief and co-mining method
based on gob-side entry retaining in the first mining whole rock pressure relief working
face, which comprises the following steps:
(1) according to the actual comprehensive histogram of the coal mine, comprehensively
considering the horizon, hardness and other factors of each rock stratum, selecting the
rock stratum suitable for arranging the whole rock working face as the first mining whole
rock pressure relief rock stratum;
(2) According to the height, hardness, working face layout length and working face
inclination angle of the first mining whole rock pressure relief strata, the required shearer,
hydraulic support, conveyor, etc. are selected;
(3) According to the layout parameters of the working face, the first mining whole rock
pressure relief working face is formed;
(4) In the process of advancing the whole rock working face, the gob-side entry retaining
method is used along the track lane;
(5) Excavate the drilling field in the advanced whole rock working face near the mining
side, with the drilling field spacing of 40-60 m and the drilling field dimensions of 4-6 m wide, 3-5 m deep and 2 ~ 3.5 m high; For each drilling field, there are no less than two groups of up against and back against top cutting drilling holes, which are parallel to each other. Top-cutting drilling groups up against the working face and back against working face are collectively referred to as top cutting drilling groups. For each top-cutting drilling group, there are no less than 3 top cutting drilling holes in each group, and the top-cutting drilling holes in each group are arranged in a plane with fan-shaped scattering. The horizontal rotation angle of the top cutting drilling holes is not more than
10; the horizontal rotation angle between adjacent top-cutting drilling holes is 3-4°, and
the elevation angle of the top cutting drilling holes is 15~25°. The elevation angle interval
between adjacent top cutting drilling holses is 4~5°. The vertical distance between the
height of the starting end of the charge section of the top cutting drilling and the roof is
more than 3 m, and the length of the hole sealing section is more than 5 m; Blasting the
top cutting hole 10~40 m in front of the advanced whole rock working face is carried out;
(6) Caving drilling holes are set in the advanced whole rock working face, with a spacing
of 20~40 m in each group. Each group of caving drilling holes has four caving holes,
which are one main roof cutting hole, one block cutting hole and two end cutting holes.
The diameter of each caving hole is not less than 75 mm, and the horizontal angles of the
main roof cutting hole and block cutting hole are 70-90, and The horizontal angle of the
end cutting hole is 20~30°; the projection of hole sealing length of caving drilling in
horizontal plane is greater than 3 times of roadway width, and the hole sealing length is
greater than 10 m;
(7) After the whole rock working face is mined, an upward roof gas extraction drilling
field is arranged at intervals of 20 m in gob-side entry retaining, and three upward roof pressure relief crack ring gas extraction drilling holes are constructed in the drilling field, with a diameter of not less than 91 mm and an inclination angle of 50~65°. The hole sealing length of the orifice is greater than the height of the regular caving zone in the normal direction of the mining rock roof, and the normal hole sealing depth is not less than 5 times the mining height, so as to extract the overlying high gas coal seam to relieve gas; In gob-side entry retaining, a downward gas drainage drilling field is arranged at intervals of 10 m, and three downward floor pressure relief crack ring gas drainage drilling holes are constructed in the drilling field. The diameter of the drilling holes is not less than 91 mm, the dip angle is -50~-80°, and the hole sealing length of the orifice is not less than 15 m. The underlying high-gas coal seam is extracted to relieve gas. In the gob-side entry retaining, a goaf gas extraction drilling field is arranged at intervals of 20 m, and three goaf gas extraction drilling holes with a diameter of not less than 40 mm are constructed in the drilling field to extract the gas in the goaf;
(8) Construction of drilling field and drilling hole in the advanced working face is
ensured according to the progress of mining, and at the same time gas drainage of gob
side entry retaining is ensured according to the progress.
The above is only the preferred embodiment of the present invention, and it should be
pointed out that for ordinary people in the technical field, without departing from the
principle of the present invention, several improvements and embellishments can be
made and these improvements and embellishments should also be regarded as the
protection scope of the present invention.
Claims (4)
1. A high-gas coal seam group pressure relief mining method based on gob-side entry
retaining in the first mining whole rock pressure relief working face, in which coal
strata are moved by the first mining pressure relief coal seam to generate a roof
pressure relief crack ring and a floor pressure relief crack ring, and gas drainage
drilling holes for upward pressure relief crack ring and downward pressure relief
crack ring are respectively arranged in gob-side entry retaining to extract desorbed
free gas; it is characterized in that when the first mining pressure relief coal seam
cannot be selected and other gas control methods are difficult to apply, the coal strata
are moved and destroyed by the first mining whole rock pressure relief working face;
the overlying high-gas coal seam and the underlying high-gas coal seam are
depressurized and expanded, which leads to the development of cracks of surrounding
the increased gas permeability and desorption and migration of gas; finally a roof
pressure relief crack ring and a floor pressure relief crack ring are formed.
2. A high-gas coal seam group pressure relief mining method based on gob-side entry
retaining in the first mining whole rock pressure relief working face according to
claim 1, is achieved by following steps: the first mining whole rock pressure relief
working face causes movement and destruction of coal and rock formations; the
specific method is: excavate the drilling field in the advanced whole rock working
face, and set up the top-cut drilling up against working face and top cutting drilling
back against working face in the drilling field to keep the cantilever length in goaf
(less than 12 m); according to the lithological characteristics of the overlying high-gas
coal seam, set up caving drilling in the advanced whole rock working face, and implement deep hole pre-splitting blasting on the caving drilling to ensure that the roof fully collapses and fills the goaf area; at the same time, a filling wall is built at the goaf side of the whole rock working face to realize gob-side entry retaining.
3. high-gas coal seam group pressure relief mining method based on gob-side entry
retaining in the first mining whole rock pressure relief working face according to
claim 1, the vertical distance between any adjacent coal seam is 120-150 m; when
selecting the first mining whole rock pressure relief working face, the surrounding
rock structure, roof caving and floor pressure relief characteristics should be fully
considered, and the vertical distance between the first mining whole rock pressure
relief working face and the overlying pre-pressure relief coal seam is 30-90 m and
the vertical distance between the first mining whole rock pressure relief working face
and underlying pre-pressure relief coal seam is 20-60 m.
4. high-gas coal seam group pressure relief mining method based on gob-side entry
retaining in the first mining whole rock pressure relief working face according to
claim 1, characterized in that: when selecting the first mining whole rock pressure
relief working face, it is required that the rock hardness Platts coefficient of the first
mining whole rock pressure relief working face is f<7; the working face layout length
is 150-250 m; the advancing length is 1000-2500 m; the rock mining height is
1.3-3.5 m, and the working face inclination angle is <20°.
-1/2- 20 Aug 2021
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| Application Number | Priority Date | Filing Date | Title |
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|---|---|---|---|
| AU2021106168A AU2021106168A4 (en) | 2021-08-20 | 2021-08-20 | High-gas Coal Seam Group Pressure Relief Mining Method Based on Gob-side Entry Retaining in the First Mining Whole Rock Pressure Relief Working Face |
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| AU2021106168A4 true AU2021106168A4 (en) | 2021-10-28 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109539920A (en) * | 2018-12-27 | 2019-03-29 | 西安通源石油科技股份有限公司 | A kind of top plate fracturing method and device of coal mining |
| CN114382527A (en) * | 2022-01-13 | 2022-04-22 | 中国矿业大学(北京) | Technical method for coordinated gas drainage of high and low roadway in high gas coal seam group |
| CN114575844A (en) * | 2022-02-25 | 2022-06-03 | 天地科技股份有限公司 | Roadway roof segmented pressure relief and reinforcement control method based on double-roadway excavation |
| WO2023201906A1 (en) * | 2022-04-22 | 2023-10-26 | 山东科技大学 | Releasing-cracking-supporting cooperative burst prevention method based on coal body pressure relief and roof pre-cracking |
| US11834949B2 (en) | 2022-04-22 | 2023-12-05 | Shandong University Of Science And Technology | Collaborative erosion-control method of releasing-splitting-supporting based on coal mass pressure relief and roof pre-splitting |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109539920A (en) * | 2018-12-27 | 2019-03-29 | 西安通源石油科技股份有限公司 | A kind of top plate fracturing method and device of coal mining |
| CN109539920B (en) * | 2018-12-27 | 2023-08-25 | 通源石油科技集团股份有限公司 | Top plate fracturing method and device for coal exploitation |
| CN114382527A (en) * | 2022-01-13 | 2022-04-22 | 中国矿业大学(北京) | Technical method for coordinated gas drainage of high and low roadway in high gas coal seam group |
| CN114575844A (en) * | 2022-02-25 | 2022-06-03 | 天地科技股份有限公司 | Roadway roof segmented pressure relief and reinforcement control method based on double-roadway excavation |
| WO2023201906A1 (en) * | 2022-04-22 | 2023-10-26 | 山东科技大学 | Releasing-cracking-supporting cooperative burst prevention method based on coal body pressure relief and roof pre-cracking |
| US11834949B2 (en) | 2022-04-22 | 2023-12-05 | Shandong University Of Science And Technology | Collaborative erosion-control method of releasing-splitting-supporting based on coal mass pressure relief and roof pre-splitting |
| CN118246102A (en) * | 2024-02-27 | 2024-06-25 | 山东科技大学 | A roof pre-cracking design method based on energy prediction |
| CN118246102B (en) * | 2024-02-27 | 2024-09-10 | 山东科技大学 | Roof presplitting design method based on energy prediction |
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