CN116006243A - Large-area full-time empty high-efficiency gas control method for soft outburst coal seam - Google Patents
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Abstract
The invention relates to a full-time empty high-efficiency gas control method for a large area of a soft outburst coal seam, and belongs to the field of coal mine gas control. S1, arranging high-position directional branch long drilling holes of a coal seam roof; s2, arranging long drill holes of low-position directional branches of the coal seam roof, S3, and connecting the long drill holes with a drainage pipeline to conduct gas drainage. The method adopts the high-position and low-position directional branch long drilling holes of the coal seam roof to realize the efficient treatment of gas in coal lanes, fracture zones, upper corners, stoping working faces, adjacent layers and goafs in the extraction process of the soft coal seam, solves the technical problems of large construction difficulty, easy hole collapse, poor extraction effect, small gas treatment area, incapability of large-area advanced gas treatment, low efficiency and the like of the soft protruding coal seam, and has important significance in reducing the gas treatment engineering quantity and cost, the gas treatment effect and the full-time empty efficient gas treatment.
Description
Technical Field
The invention belongs to the field of coal mine gas control, and particularly relates to a full-time empty high-efficiency gas control method for a large area of a soft outburst coal seam.
Background
The gas disaster seriously affects the safety production of the coal mine. To realize the safe extraction of the extraction working face of the outstanding coal seam, the extraction standard and the gas emission control of the extraction are required to be realized essentially, and further, the space-time efficient extraction of the extraction working face is required to be realized. The soft coal seam has low hardness and poor air permeability, and the bedding drilling has the problems of high construction difficulty, easy hole collapse, poor extraction effect and the like; along with the development of technology, though a large directional drilling machine appears, the problems of non-deep directional long drilling and the like still exist, the mining succession is seriously influenced, and the safety management is not facilitated. In addition, the existing gas control method has the problems of small gas control area, incapability of realizing large-area advanced gas control and low efficiency, and severely restricts the safe and efficient production of coal mines.
Disclosure of Invention
Therefore, the invention aims to provide a large-area full-time air gas high-efficiency treatment method aiming at a soft outburst coal seam so as to solve the problems existing in the existing gas treatment process.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a full-time empty high-efficiency gas control method for a large area of a soft outburst coal seam comprises the following steps: s1, arranging high-position directional branch long drill holes of a coal seam roof; s2, arranging long drill holes of low-position directional branches of a coal seam roof; s3, accessing a gas extraction pipeline to carry out gas extraction;
in the step S1, a high-position directional branch long drilling hole of a coal seam roof comprises a high-position main hole and a high-position branch hole; the reasonable space construction position of the high-level main hole comprises a construction range of the coal seam inclination direction and a construction horizon of the vertical direction;
the construction range of the high-level main hole in the coal seam inclination direction is as follows: W+Y p ≤Y 3 ≤L/3；
Wherein: w is the width of a return airway of the stope face, and the unit is m; y is Y p The width of the gas discharge zone of the return airway of the stope face is m; l is the length of a cutting hole of the stope face, and the unit is m;
the method for determining the construction horizon of the high-level main hole in the vertical direction comprises the following steps: firstly determining the construction row number N of the high-level main holes, and then determining the construction layer positions of the high-level main holes according to the construction row number and the arithmetic series, so that the layer height of each high-level main hole sequentially increases from the return airway of the stope face to the middle of the stope face;
wherein the construction row number N is according to the construction range Y 3 And determining the extraction radius r of the coal seam:
N＝[L/3－(W+Y p )]÷2r+1；
wherein: l is the length of a cutting hole of the stope face, and the unit is m; y is Y p The width of the gas discharge zone of the return airway of the stope face is m; r is the extraction radius of the coal seam, and the unit is m;
assuming that the range of the construction horizon h is a-b, the tolerance of the arithmetic series is (b-a)/N, and the horizon heights of the ith, j and k high-order main holes are a+i× (b-a)/N, a +j× (b-a)/N, a +k× (b-a)/N in sequence, and the like, so as to determine the construction horizon of each high-order main hole;
in the step S2, the low-level directional branch long drilling hole of the coal seam roof comprises a low-level main hole and a low-level branch hole; the low-level main hole is arranged at a position 1-5 m away from the coal seam roof in the vertical direction.
Further, in step S1, in the coal seam inclination direction, the design intervals between the adjacent high-level main holes and between the adjacent high-level branch holes are all Y 1 ，Y 1 2 times of the extraction radius r; in the direction of the coal seam trend, the drilling design length of the high-level main hole is greater than the length X of the stope face and exceeds more than 20 m.
In step S1, after the reasonable space construction position of the high-level main hole is determined, designing high-level branch holes in the coal seam trend direction and the coal seam trend direction respectively; in the direction of the coal seam trend, adjacent high-level branch holes are divided into X-shaped branch holes 1 Are arranged at equal intervals.
Further, the construction length of each high-level branch hole is controlled by a final hole point, and the final hole point distance of two adjacent high-level branch holes is smaller than or equal to 2 times of the extraction radius r.
Further, in step S1, a high construction is performed firstMain holes at each interval X after the high main holes are constructed to a preset depth 1 And sequentially constructing the high branch holes from the bottom of the high main hole to the hole opening in a retreating way.
In step S1, further, high-level main holes with different heights are arranged at the coal seam roof within a certain range at the left side and the right side of the return airway of the stope face in the roof fracture zone, so as to realize the simultaneous full coverage of gas flowing into the fracture zone from the stope face and the adjacent layers.
Further, in step S2, in the coal seam inclination direction, the design pitches of adjacent low-level main holes are all Y 1 ，Y 1 2 times of the extraction radius r; in the direction of the coal seam trend, the drilling design length of the low-level main hole is greater than the length X of the stope face and exceeds more than 20 m.
In step S2, in the coal seam direction, adjacent lower branch holes are formed by X 1 Are arranged at equal intervals.
Further, X 1 100-300 m.
Further, in the coal roadway tunneling process, tee joints are arranged on branch holes of the coal roadway strips exposed in the coal roadway, and a pipeline is led out to simultaneously extract gas in the coal seam and the goaf.
The invention has the beneficial effects that:
the control method adopts the high-position and low-position directional branch long drilling holes of the coal seam roof to realize the efficient control of gas in coal lanes, fracture zones, upper corners, stoping working faces, adjacent layers and goafs in the extraction process of the soft coal seam, solves the technical problems of large construction difficulty, easy hole collapse, poor extraction effect, small gas control area, incapability of large-area advanced gas control, low efficiency and the like of the soft protruding coal seam, and has important significance in reducing the quantity and cost of gas control engineering, the gas control effect and the full-time empty efficient gas control.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objects and other advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.
Drawings
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in the following preferred detail with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of the planar layout of the full-time empty high-efficiency gas control in a large area of a soft outburst coal seam.
FIG. 2 is a schematic diagram of a cross-sectional layout of a high-level, low-level directional branch long borehole of a roof of a coal seam in a coal seam dip direction;
FIG. 3 is a schematic diagram of a cross-sectional layout of a low-level main hole and a low-level branch hole of a low-level directional branch long drilled hole of a coal seam roof in the direction of the coal seam strike;
FIG. 4 is a schematic diagram of a cross-sectional layout of the 1 st high-level main hole and the high-level branch holes in the coal seam strike direction;
FIG. 5 is a schematic diagram of a cross-sectional layout of the ith high-level main hole and the high-level branch holes in the coal seam strike direction;
FIG. 6 is a schematic diagram of a cross-sectional layout of a jth high-level main hole and a high-level branch hole in the coal seam strike direction;
FIG. 7 is a schematic diagram of a cross-sectional layout of the kth high-level main hole and the high-level branch hole in the coal seam strike direction.
Reference numerals:
1-developing a tunnel of an ascending and descending mountain;
2-stope face transport lanes;
3-a return airway of the stope face;
4-cutting the hole on the stope face;
5-a low-level main hole of a long drilling hole of a low-level directional branch of a coal seam roof;
6-a kth high-position main hole in the high-position directional branch long drilling hole of the coal seam roof;
7-the j-th high-level main hole in the high-level directional branch long drilling hole of the coal seam roof;
8-the ith high-level main hole in the high-level directional branch long drilling hole of the coal seam roof;
9-the 1 st high-level main hole in the high-level directional branch long drilling hole of the coal seam roof;
10-high branch holes connected with the high main holes in the high directional branch long drill holes of the coal seam roof;
11-coal seam;
12-extraction pipelines;
13-a low-level branch hole communicated with a low-level main hole in the long-level directional branch drilling hole of the coal seam roof;
x-stope face length;
X 1 -a designed spacing between adjacent branch holes in the direction of the coal seam strike;
the length of the cut of the L-stope face;
the width of the return airway of the W-stope face;
the number of construction rows of high-level main holes in the high-level directional branch long drilling holes of the N-coal seam roof;
h-constructing the layer position of each high-position main hole in the high-position directional branch long drilling hole of the coal seam roof;
h g1 -construction horizon of the 1 st high-order main hole;
h gi -the construction horizon of the i-th high-order main hole;
h gj -a construction horizon of a j-th high-order main hole;
h gk -a construction horizon of a kth high-order main hole;
h d -the distance between the lower main hole and the roof of the coal seam in the vertical direction;
the extraction radius of the r-coal bed,
Y 1 -a designed spacing between adjacent main and branch holes in the coal seam dip direction;
Y 2 -the construction range of the high-level main hole on the left side of the stope return air roadway in the coal seam inclination direction by taking the lower side coal wall of the stope return air roadway as a boundary;
Y 3 -the construction range of the high-level main hole on the right side of the return air lane of the stope face in the coal seam inclination direction by taking the lower side coal wall of the return air lane of the stope face as a boundary;
Y p -width of gas discharge zone of return air lane of stope face.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the illustrations provided in the following embodiments merely illustrate the basic idea of the present invention by way of illustration, and the following embodiments and features in the embodiments may be combined with each other without conflict.
Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to limit the invention; for the purpose of better illustrating embodiments of the invention, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numbers in the drawings of embodiments of the invention correspond to the same or similar components; in the description of the present invention, it should be understood that, if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc., that indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but not for indicating or suggesting that the referred device or element must have a specific azimuth, be constructed and operated in a specific azimuth, so that the terms describing the positional relationship in the drawings are merely for exemplary illustration and should not be construed as limiting the present invention, and that the specific meaning of the above terms may be understood by those of ordinary skill in the art according to the specific circumstances.
Referring to fig. 1, the invention provides a large-area full-time air gas high-efficiency treatment method for a soft outburst coal seam, which specifically comprises the following steps:
step 1: and (5) designing and constructing a high-position directional branch long drilling hole of the coal seam roof.
The high-position directional branch long drill hole of the coal seam roof comprises a high-position main hole and a high-position branch hole. Firstly, determining reasonable space positions of a high-level main hole, and then designing and constructing the high-level main hole and a high-level branch hole, wherein the specific implementation method is as follows:
(1) Determining reasonable space construction position of high-position main hole
The reasonable space construction position of the high-level main hole mainly comprises a construction range of the coal seam inclination direction and a construction horizon of the vertical direction, and the determination method is as follows:
1) Construction range of coal seam inclination direction
Referring to fig. 1 and 2, according to the gas control requirement, the high-level main hole covers a certain range on the left side and the right side of the stope face return air lane 3 in the coal seam trend direction, the lower side coal wall of the stope face return air lane 3 is taken as a boundary, and the high-level main hole in the high-level directional branch long drilling hole of the coal seam roof is divided into the left side and the right side according to the stope face advancing direction.
Let the construction range on the left side be Y 2 The construction range on the right side is marked as Y 3 。
The construction range on the right side is to cover the stope face return air lane 3 and the gas discharge zone of the stope face return air lane, so the calculation formula is as follows: y is Y 3 ≥W+Y p The method comprises the steps of carrying out a first treatment on the surface of the Wherein: w is the width of a return airway of the stope face, and the unit is m; y is Y p The unit of the width of the gas discharge zone for the return airway of the stope face is m.
The left side is constructed to avoid the goaf recompression area which is generally not more than 1/3 of the cutting length L of the working surface and is marked as Y 3 ≤L/3。
In conclusion, the construction range of the high-level main hole (in the long drilling holes of the high-level directional branch of the coal seam roof) in the coal seam inclination direction is W+Y p ≤Y 3 ≤L/3。
2) Vertical direction construction horizon
Referring to fig. 2, a comprehensive histogram of a mine, mine geological survey holes and constructed holes are collected, lithology and mechanical parameters of a roof rock layer of a coal seam are analyzed, and according to a roof three-zone theory, high-position directional branch long holes of the roof of the coal seam are arranged in a roof fracture zone, and the range of a construction horizon h of a high-position main hole in a vertical direction is generally 2-5 times of the thickness M of the coal seam.
Because the gas emission amounts of the top plates at different heights have different, the high-position directional branch long drilling holes of the top plates of the coal seam are arranged at different levels (heights) of the top plates of the coal seam, and the gas of the extraction and recovery working face and the adjacent layer which is in the fracture zone can be fully covered, and the construction level of each high-position main hole is determined as follows:
referring to fig. 2, the number N of construction rows of high-level main holes (in the long drill holes of the high-level directional branch of the coal seam roof) is first determined, and then the high-level main holes with sequentially increased level heights h are sequentially designed from the right side of the return airway of the stope face along the advancing direction of the stope face according to the number N of construction rows and an arithmetic progression.
(1) Construction row number of high-order main holes
The construction row number N of the high-level main holes (in the high-level directional branch long drilling holes of the coal seam roof) can be based on the construction range Y of the high-level main holes in the coal seam trend direction 3 And determining the extraction radius r of the coal seam, wherein the calculation formula is as follows:
N＝[L/3－(W+Y p )]÷2r+1；
wherein: l is the length of a cutting hole of the stope face, and the unit is m; y is Y p The width of the gas discharge zone of the return airway of the stope face is m; r is the extraction radius of the coal seam, and the unit is m.
(2) Construction horizon of high-order main hole
Assuming that the range of the construction horizon h of the high-order main holes (in the long drilling holes of the high-order directional branches of the coal seam roof) is a-b, the tolerance of the arithmetic series is (b-a)/N, and the heights of the ith, j and k high-order main holes are a+i× (b-a)/N, a +j× (b-a)/N, a +k× (b-a)/N in sequence. And the construction horizon of each high-level main hole can be determined by the same method.
(2) Design and construction of high-level main hole and high-level branch hole
1) Designing a high-level main hole and a high-level branch hole
Referring to fig. 3-6, after the reasonable spatial positions of the high-level main holes are determined, the high-level main holes and the high-level branch holes are respectively designed in the coal seam trend direction and the trend direction.
In the coal seam inclination direction, the design space between the adjacent high-level main holes and the design space between the adjacent high-level branch holes are all Y 1 ，Y 1 Typically 2 times the extraction radius r. In the direction of the coal seam trend, the drilling design length of the high-level main hole is generally longer than the length X of the stope face and more than 20 m.
In the direction of the coal seam trend, the adjacent high branch holes are separated by a distance X 1 Equidistant design, X 1 Typically 100-300 m, and can be specifically determined according to occurrence of coal seams. The construction length of the high-order branch holes is controlled by the final hole points, and the distance between the final hole points of two adjacent high-order branch holes is less than or equal to 2 times of the extraction radius r.
The construction design of the branch hole can be realized by inputting the parameters into intelligent drilling machine construction parameter design software, and the following is the same.
2) Construction of high-level main hole and high-level branch hole
And after the construction parameters of the high-level main hole and the high-level branch hole are designed, constructing according to the design parameters. Firstly, constructing high-level main holes, and after the high-level main holes are constructed to a preset depth, each interval X 1 And sequentially constructing the high branch holes from the bottom of the high main hole to the hole opening in a retreating way.
Step 2: design and construction of long drilling hole of directional branch in low position of coal seam roof
(1) Design low-level main hole and low-level branch hole
Referring to fig. 1 and 2, the construction range of the long drilling holes of the low-position directional branches of the coal seam roof is the area except for the long drilling holes of the high-position directional branches of the coal seam roof. Referring to fig. 7, the coal seam roof low-level directional branch long drilling holes are divided into low-level main holes and low-level branch holes, and the low-level main holes of the coal seam roof low-level directional branch long drilling holes are generally arranged at a distance of 1-5 m from the coal seam roof in the vertical direction.
Referring to fig. 1 and 2, design parameters of a low-level main hole and a low-level branch hole of a long drilling hole of a low-level directional branch of a coal seam roof are the same as those of a high-level main hole and a high-level branch hole. I.e. in the direction of the coal seam inclination,the design space between adjacent low-level main holes and between adjacent low-level branch holes is Y 1 ，Y 1 2 times of the extraction radius r; in the direction of the coal seam trend, the drilling design length of the low-level main hole is greater than the length X of the stope face and exceeds more than 20 m.
In the direction of the coal seam trend, adjacent low-level branch holes are divided into X-shaped branch holes 1 Are arranged at equal intervals, X 1 Typically 100-300 m, and is specifically determined according to occurrence of coal seams. The construction length of the low-level branch holes is controlled by the final hole points, and the distance between the final hole points of two adjacent low-level branch holes is less than or equal to 2 times of the extraction radius r.
(2) Construction of low-level main hole and low-level branch hole
Referring to FIGS. 1-2, the construction method is the same as that of the high-level main hole and the high-level branch hole, namely, the low-level main hole is firstly constructed, and when the low-level main hole is constructed to a preset depth, each interval X 1 And (3) sequentially constructing the low-level branch holes from the bottom of the low-level main hole to the hole opening in a retreating way.
Step 3: and (5) accessing a gas extraction pipeline to carry out gas extraction.
Referring to fig. 1, according to the outburst prevention requirement, the low-position directional branch long drilling holes and the high-position directional branch long drilling holes of each stope face are respectively and independently divided into 1 extraction unit, and are respectively and independently connected into extraction pipelines to measure extraction gas extraction quantity. Then, judging the gas extraction standard according to the gas extraction amount, and carrying out coal roadway tunneling operation after the gas extraction standard in the coal roadway strip area; and the gas extraction in the extraction area can be subjected to extraction operation after reaching the standard.
And (3) performing coal roadway tunneling after gas extraction standards are evaluated, in the coal roadway tunneling process, installing a tee joint on a branch hole of a coal roadway strip exposed in the coal roadway, connecting a leading-out pipeline with a goaf pipeline, preparing for extracting goaf gas during working face extraction, and continuously extracting slit-zone and upper corner gas from the original branch hole, so that the gas is efficiently managed in a large area of a soft coal seam in a full time space, and the gas of the coal roadway, the slit-zone, the upper corner, the extraction working face, the adjacent layers and the goaf in the extraction process of the soft coal seam can be extracted. This process description takes only one stope face as an example, other neighboring faces follow the stope succession, and so on.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention, which is intended to be covered by the claims of the present invention.
Claims (10)
1. A full-time empty high-efficiency gas treatment method for a large area of a soft outburst coal seam is characterized by comprising the following steps of: s1, arranging high-position directional branch long drill holes of a coal seam roof; s2, arranging long drill holes of low-position directional branches of a coal seam roof; s3, accessing a gas extraction pipeline to carry out gas extraction;
in the step S1, a high-position directional branch long drilling hole of a coal seam roof comprises a high-position main hole and a high-position branch hole; the reasonable space construction position of the high-level main hole comprises a construction range of the coal seam inclination direction and a construction horizon of the vertical direction;
the construction range of the high-level main hole in the coal seam inclination direction is as follows: W+Y p ≤Y 3 ≤L/3；
Wherein: w is the width of a return airway of the stope face, and the unit is m; y is Y p The width of the gas discharge zone of the return airway of the stope face is m; l is the length of a cutting hole of the stope face, and the unit is m;
the construction horizon determination method of the high-level main hole in the vertical direction comprises the following steps: firstly determining the construction row number N of the high-level main holes, and then determining the construction layer positions of the high-level main holes according to the construction row number and the arithmetic series, so that the layer height of each high-level main hole sequentially increases from the return airway of the stope face to the middle of the stope face;
wherein the construction row number N is according to the construction range Y 3 And determining the extraction radius r of the coal seam:
N＝[L/3－(W+Y p )]÷2r+1；
wherein: l is the length of a cutting hole of the stope face, and the unit is m; y is Y p Band width of gas exhaust band for return airway of stope faceThe unit is m; r is the extraction radius of the coal seam, and the unit is m;
assuming that the range of the construction horizon h is a-b, the tolerance of the arithmetic series is (b-a)/N, and the horizon heights of the ith, j and k high-order main holes are a+i× (b-a)/N, a +j× (b-a)/N, a +k× (b-a)/N in sequence, and the like, so as to determine the construction horizon of each high-order main hole;
in the step S2, the low-level directional branch long drilling hole of the coal seam roof comprises a low-level main hole and a low-level branch hole; the low-level main hole is arranged at a position 1-5 m away from the coal seam roof in the vertical direction.
2. The method for high-efficiency gas treatment in large-area full-time space of soft outburst coal seams according to claim 1, which is characterized in that: in step S1, in the coal seam inclination direction, the design intervals between adjacent high-level main holes and between adjacent high-level branch holes are all Y 1 ，Y 1 2 times of the extraction radius r; in the direction of the coal seam trend, the drilling design length of the high-level main hole is greater than the length X of the stope face and exceeds more than 20 m.
3. The method for high-efficiency gas treatment in large-area full-time space of soft outburst coal seams according to claim 1, which is characterized in that: in the step S1, after the reasonable space construction position of the high-level main hole is determined, designing high-level branch holes in the coal seam trend direction and the coal seam trend direction respectively; in the direction of the coal seam trend, adjacent high-level branch holes are divided into X-shaped branch holes 1 Are arranged at equal intervals, X 1 100-300 m.
4. A method for high efficiency gas abatement in large areas of a soft protruding coal seam in full time space according to claim 3, wherein: the construction length of each high-level branch hole is controlled by a final hole point, and the final hole point distance of two adjacent high-level branch holes is less than or equal to 2 times of the extraction radius r.
5. The method for high-efficiency gas treatment in large-area full-time space of soft outburst coal seams according to claim 1, which is characterized in that: in the step S1, a high-level main hole is firstly constructed,when the high-order main hole is constructed to a preset depth, each interval X 1 And sequentially constructing the high branch holes from the bottom of the high main hole to the hole opening in a retreating way.
6. The method for high-efficiency gas treatment in large-area full-time space of soft outburst coal seams according to claim 1, which is characterized in that: in the step S1, high-position main holes with different heights are arranged at the coal seam roof in a certain range at the left side and the right side of the return airway of the stope face in the roof fracture zone so as to realize the purpose of simultaneously and fully covering gas which flows into the fracture zone from the stope face and the adjacent layers.
7. The method for high-efficiency gas treatment in large-area full-time space of soft outburst coal seams according to claim 1, which is characterized in that: in the step S2, in the coal seam inclination direction, the design intervals of adjacent low-level main holes are all Y 1 ，Y 1 2 times of the extraction radius r; in the direction of the coal seam trend, the drilling design length of the low-level main hole is greater than the length X of the stope face and exceeds more than 20 m.
8. The method for high-efficiency gas treatment in large-area full-time space of soft outburst coal seams according to claim 1, which is characterized in that: in step S2, in the coal seam trend direction, adjacent low-level branch holes are divided by X 1 Are arranged at equal intervals.
9. The method for high-efficiency gas treatment in large-area full-time space of soft outburst coal seams according to claim 1, which is characterized in that: in step S2, the low-level main holes are firstly constructed, and when the low-level main holes are constructed to a preset depth, each interval X 1 And sequentially constructing the low-level branch holes in a way that the distance is retreated from the hole bottom of the main hole to the hole opening.
10. The method for high-efficiency gas treatment in large-area full-time space of soft outburst coal seams according to claim 1, which is characterized in that: in the coal roadway tunneling process, tee joints are arranged on branch holes of coal roadway strips exposed in the coal roadway, and a pipeline is led out to simultaneously extract coal seam and goaf gas.
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