CN115506769A - Three-dimensional gas extraction method for coal seam roof fissure zone - Google Patents
Three-dimensional gas extraction method for coal seam roof fissure zone Download PDFInfo
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- E—FIXED CONSTRUCTIONS
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Abstract
The invention relates to a method for three-dimensional extraction of gas in a coal seam roof fissure zone, and belongs to the field of gas treatment of a coal mine goaf. The method comprises the steps of S1, designing and constructing a main hole of a directional branch long drilling hole of a coal seam roof fissure zone; s2, designing and constructing branch holes of the directional branch long drill holes of the coal seam roof fissure zone; and S3, connecting the gas extraction pipeline to perform gas extraction. The technical problem that the existing gas treatment method cannot extract the gas in the fractured zone of the roof in a full-covering, three-dimensional, advanced and full-time mode is solved, the gas in the fractured zone of the roof is extracted in a multi-purpose, full-covering, three-dimensional, advanced, full-time and high-efficiency mode, and the gas treatment engineering quantity and cost of the goaf are reduced.
Description
Technical Field
The invention belongs to the field of gas treatment in a coal mine goaf, and particularly relates to a method for three-dimensional extraction of gas in a coal seam roof fissure zone.
Background
Along with the increase of the coal mining depth and strength, the gas emission quantity of the coal mining working face of a coal mine is increased, and the gas treatment difficulty of a top plate crack zone on the working face of the coal mining face is further increased. At present, methods such as high-suction roadway and long-drill-hole extraction in roof strike are mainly adopted for gas treatment of a roof fissure zone of a working face of a coal mine mining face. The gas treatment effect of the high-drainage roadway is obvious, but the tunneling cost is high, the construction time is long, the construction of the working face needs to be advanced, and the mining succession of the mine is seriously influenced. The gas in the worked-out section is extracted and treated by long drill holes in the roof strike, the construction organization is flexible, the construction drilling work amount is large, the gas treatment effect is poor, the working face extraction is delayed sometimes, and the gas in the fissure zone of the roof can not be continuously and efficiently treated. Generally, the range of gas extraction in the fractured zone of the roof by the two methods is relatively small, and the gas extraction in the fractured zone of the roof in full coverage, three-dimensional, advanced and full time-space modes cannot be realized.
Disclosure of Invention
In view of the above, the invention aims to provide a method for three-dimensional extraction of gas in a coal seam roof fissure zone, so as to solve the problems and the defects of the existing method for treating the gas in the roof fissure zone.
In order to achieve the purpose, the invention provides the following technical scheme:
a three-dimensional gas extraction method for a coal seam roof fissure zone comprises the following steps: s1, designing and constructing a main hole 5 of a directional branch long drilling hole of a coal seam roof fissure zone; s2, designing and constructing branch holes of the directional branch long drill holes of the coal seam roof fissure zone; s3, connecting an extraction pipeline 13 to perform gas extraction;
in step S1, in the coal seam inclination direction, the main hole 5 is arranged in the center of a pressure relief area after the recovery of a working faceA space which is bounded by the lower coal wall of the stope face return airway 3 close to the stope side and is spaced by L 1 Distance is the optimum construction position, L 1 The calculation formula of (2) is as follows:
L 1 ＝[Y/3-h/tan(α+β)]÷2；
in the formula: l is 1 The optimal construction position of the main hole in the coal seam inclination direction is defined as m; alpha is the inclination angle of the coal bed and is expressed by degree; beta is a roof overburden rock pressure relief angle with the unit of degree; y is the width of the cutting hole of the stope face and the unit is m; h is the vertical distance between the main hole and the coal seam roof and the unit is m;
in the vertical direction of the coal seam, the main hole 5 is arranged at the topmost end of the top plate fissure zone;
in the step S2, the branch holes of the directional branch long drill hole of the coal seam roof fissure zone comprise high-position branch holes and low-position branch holes which are alternately arranged along the extending direction of the main hole 5;
the high-level branch hole is divided into a high-level branch hole 6 at the extraction side and a high-level branch hole 7 at the coal roadway side; in the working face extraction direction, the extraction side high-level branch holes 6 and the coal roadway side high-level branch holes 7 are distributed on two sides of the main hole 5 at equal intervals and symmetrically; in the vertical direction of the coal bed, the height of the final hole points of the high-level branch hole 6 at the extraction side and the high-level branch hole 7 at the coal roadway side is h K +0.5h L (ii) a In the formula: h is K Vertical height of the collapse zone in m; h is L Vertical height of the fracture zone in m; the construction range Y of the high-position branch hole 7 at the coal roadway side in the vertical working face extraction direction 2 The gas discharge zone of the return airway 3 of the stope face is covered, and the calculation formula is as follows: y is 2 ≥L 1 +W+Y p (ii) a In the formula: w is the width of the return airway of the stope face, and the unit is m; y is p The width of a gas discharge zone of a return airway of a stope face is m;
the low-level branch hole is divided into a low-level branch hole 8 at the extraction side and a side branch hole 9 at the coal roadway side; in the working face stoping direction, the stoping side low-position branch holes 8 and the coal roadway side branch holes 9 are distributed on two sides of the main hole 5 at equal intervals and symmetrically; in the vertical direction of the coal bed, the final hole heights of the low-position branch hole 8 at the extraction side and the side-position branch hole 9 at the coal roadway are h K (ii) a In thatThe projection length of the low-level branch hole 8 on the extraction side in the horizontal direction in the extraction direction vertical to the working face is Y 1 ，Y 1 It should satisfy: y is 1 ≥Y/3-L 1 (ii) a The projection length of the coal roadway side low-level branch hole 9 in the horizontal direction is Y 2 ，Y 2 ≥L 1 +W+Y p 。
Further, in step S1, the vertical distance h = h between the main hole 5 and the coal seam ceiling K +h L 。
Further, in the step S1, a large-diameter primary hole forming technology is adopted for the construction of the main hole 5, and the length of the main hole 5 is not less than the length X of the stope face in the coal seam trend direction.
Further, in step S2, the hole opening pitch and the final hole pitch between the high branch hole and the low branch hole adjacent thereto are both X 1 ，X 1 The value range of (A) is 50-100 m.
Further, in step S2, both the high branch hole and the low branch hole include a curved section and a straight section connected to the curved section; the projection lengths of the curve sections on the high-position branch hole and the low-position branch hole on the horizontal plane are X 1 The projection lengths of the straight line segments on the high-position branch hole and the low-position branch hole on the horizontal plane are X 1 ，X 1 The value range of (A) is 50-100 m.
Further, the projection of the final hole point of the previous high-position branch hole on the horizontal plane coincides with the projection of the opening point of the next high-position branch hole on the horizontal plane.
Further, the projection of the final hole point of the former low-position branch hole on the horizontal plane coincides with the projection of the opening point of the latter low-position branch hole on the horizontal plane.
The invention has the beneficial effects that:
the technical problem that the existing gas treatment method cannot extract the gas in the fractured zone of the roof in a full-covering, three-dimensional, advanced and full-time mode is solved, the gas in the fractured zone of the roof is extracted in a multi-purpose, full-covering, three-dimensional, advanced, full-time and high-efficiency mode, and the gas treatment engineering quantity and cost of the goaf are reduced.
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 objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims thereof.
Drawings
For a better understanding of the objects, aspects and advantages of the present invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a schematic plane layout view of a coal seam roof fissure zone gas three-dimensional extraction method;
FIG. 2 is a schematic cross-sectional view of a directional branched long borehole of a coal seam roof fissure zone in a coal seam inclination direction;
FIG. 3 is a schematic cross-sectional view of a directional branch long drill hole of a coal seam roof fissure zone in the coal seam strike direction.
Reference numerals:
1, a mining face tunnel, 2, a stope face transportation tunnel, 3, a stope face air return tunnel, 4, a stope face cutting hole, 5, a main hole of a coal seam roof fracture zone directional branch long drilling hole, 6, a stope side high-position branch hole, 7, a coal roadway side high-position branch hole, 8, a stope side low-position branch hole, 9, a coal roadway side low-position branch hole, 10, a high-position branch hole and low-position branch hole control area projection boundary line, 11, a coal seam, 12, a goaf and 13, an extraction pipeline;
x is the length of the stope face in the coal seam direction;
X 1 the projection length of a curve section/straight section on the high/low branch hole on the horizontal plane is the opening distance/final hole distance between the high branch hole and the low branch hole adjacent to the high branch hole;
y is the width of the cutting hole of the stope face;
Y 1 the projection lengths of the high-position branch hole at the extraction side and the low-position branch hole at the extraction side in the horizontal direction are set;
Y 2 for coal road side high positionThe projection lengths of the branch holes and the coal roadway side low-level branch holes in the horizontal direction;
Y p the width of a gas discharge belt of a return airway of a stope face;
L 1 the optimal construction position of the main hole in the coal seam inclination direction is defined;
w is the width of the return airway of the stope;
h is the vertical distance between the main hole and the coal seam roof;
h K vertical height of the collapse zone;
h L is the vertical height of the fracture zone;
h w is the vertical height of the curved belt.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood 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 numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
Referring to fig. 1 to 3, a method for extracting gas in a coal seam roof fissure zone includes the following steps:
step 1: and designing and constructing a main hole 5 of the directional branch long drilling hole of the coal seam roof fissure zone.
Firstly, determining a reasonable spatial position of a main hole 5 (hereinafter referred to as a main hole) in a directional branch long drill hole of a coal seam roof fissure zone, and then designing and constructing the main hole 5, wherein the detailed description is as follows:
(1) Determining the rational spatial position of the main hole 5
1) Optimal construction position of main hole in coal seam inclination direction
In the process of stoping of the working face, a bending zone, a crack zone and a caving zone can be formed after the roof collapses, an O-shaped ring can appear in a goaf behind the working face along with the stoping, and part of the goaf can be compacted, namely in the whole stoping process, an undetached zone, a pressure relief zone and a compaction zone can appear in an overlying strata of the roof on one side of the stoping face air return roadway 3 close to the stoping face. The main aperture 5 is thus arranged in the middle of the relief area in an optimum position.
Referring to fig. 1, the horizontal length of the unreleased area is generally h/tan (α + β), wherein α is the dip angle of the coal bed and β is the pressure relief angle of the roof overburden; according to empirical formulas, the recompacted area of the mined-out area is generally not greater than 1/3 of the width Y of the cut hole 4 of the stope face, and therefore, the optimal construction position L of the main hole 5 in the coal seam inclination direction can be obtained 1 The calculation formula of (2) is as follows:
L 1 ＝[Y/3-h/tan(α+β)]÷2；
in the formula: l is 1 For the optimal construction position of the main hole in the coal seam inclination directionThe bit is m; alpha is the inclination angle of the coal bed and is expressed by degree; beta is a roof overlying rock pressure relief angle with the unit of degree; y is the width of the cutting hole of the stope face and the unit is m; h is the vertical distance between the main hole and the coal seam roof and is expressed by m.
2) Optimum working position of main hole in vertical direction
Referring to fig. 2, a mine comprehensive histogram, mine geological survey drill holes and constructed drill holes are collected, lithology and mechanical parameters of a coal seam roof rock stratum are analyzed, according to the roof three-zone theory, directional branch long drill holes are arranged at the topmost end of a roof fracture zone, namely the junction of a roof bending zone and the fracture zone, and the height h of an opening is h K +h L Wherein h is K Vertical height of the collapse zone in m; h is a total of L Is the vertical height of the fractured zone in m. The arrangement mode increases the length of the branch holes in the fracture zone and the caving zone, and increases the gas extraction amount.
(2) Designing and constructing the main hole 5
According to the preset length X of the stope face in the coal seam direction and the width Y of the stope face cutting hole 4 and the construction layer position h of the main hole 5 in the vertical direction L +h k And an optimum construction position L in the horizontal direction 1 The design is made wherein the drilling length of the main bore 5 is generally no less than the preset length X of the stope face in the direction of the strike of the coal seam.
The construction of the main hole 5 adopts a large-diameter one-time hole forming technology, the drilling machine is a ZYWL-23000DS type directional drilling machine, the drilling tool assembly comprises a phi 200mm drill bit, a phi 127mm hole bottom motor, a phi 102mm non-magnetic drill rod and a phi 102mm cable drill rod, and the hole is formed for 200mm at one time, so that the requirement of extracting the gas emission quantity of the whole extraction working face can be met.
Step 2: design and construction of branch hole of directional branch long drilling hole of coal seam roof fissure zone
The branch holes of the directional branch long drill hole in the coal seam roof fissure zone are divided into a high-position branch hole and a low-position branch hole, and the high-position branch hole and the low-position branch hole are alternately arranged along the extending direction of the main hole (5); both branch holes comprise a curved section (located above) and a straight section (located below) connected with the curved section. The two branch holes are designed according to construction parameters in the vertical direction, the working face recovery direction (namely the coal bed strike direction) and the vertical working face recovery direction (namely the coal bed trend direction), and are constructed according to design requirements, and the detailed description is as follows:
(1) Designing high branch holes
1) In the vertical direction
Referring to fig. 2, the height h of the high branch hole in the vertical direction is the same as the height h of the main hole 5 K +h L With a final hole height of h K +0.5h L 。
2) In the working face recovery direction
Referring to fig. 3, in the working face extraction direction, the high branch holes are equally spaced and symmetrically distributed on two sides of the main hole 5.
The hole opening distance and the final hole distance between the high branch hole and the low branch hole adjacent to the high branch hole are X 1 That is, the hole opening distance and the final hole distance of two adjacent high branch holes are both 2X 1 (ii) a The projection lengths of the curve section and the straight line section on the horizontal plane of each high-position branch hole are also X 1 I.e. the projection length of each high branch hole on the horizontal plane is 2X 1 ；X 1 The value range of (A) is preferably 50 to 100m.
In the high-position branch holes, the projection of the final hole point of the previous high-position branch hole on the horizontal plane coincides with the projection of the opening point of the adjacent next high-position branch hole on the horizontal plane, namely the sum of the projection lengths of all the high-position branch holes is the total length of the stope face air return roadway 3, so that the condition that the height h of the top plate of the stope face can be extracted by the high-position branch holes is ensured K +0.5h L The above fissure zone gas.
3) In the direction perpendicular to the working face extraction direction
Referring to fig. 2, the high-level branch hole is divided into a high-level branch hole on the side close to the extraction surface (hereinafter referred to as "extraction-side high-level branch hole 6") and a high-level branch hole on the side close to the coal roadway (hereinafter referred to as "coal roadway-side high-level branch hole 7").
The projection of the high-position branch hole 6 at the extraction side on the horizontal plane is recorded as Y 1 The high-level branch hole 7 at the coal roadway side is arranged on the horizontal planeThe projection on is recorded as Y 2 。
According to the gas control requirement, the high-level branch holes of the coal seam cover a certain range of the left side and the right side of the return airway of the stope face in the coal seam inclination direction; meanwhile, the construction range of the high-position branch hole 6 at the stoping side is not less than the recompaction area of the mined out area, and according to an empirical formula, the recompaction area of the mined out area is not less than 1/3 of the length of the cutting hole of the stoping working face generally, namely Y 1 ≥Y/3-L 1 。
Therefore, the construction range of the coal roadway side high-position branch hole 7 is to cover a gas discharge zone of the return air roadway 3 of the stope face, and the calculation formula is as follows: y is 2 ≥L 1 +W+Y p (ii) a In the formula: w is the width of the return airway of the stope face, and the unit is m; y is p The width of the gas discharge zone of the return airway of the stope face is m.
(2) Designing low branch holes
1) In the vertical direction
Referring to fig. 2, the lower branch hole has the same height h in the vertical direction as the main hole 5, i.e., h K +h L With a final hole height of h K 。
2) In the working face extraction direction
Referring to fig. 3, in the working face extraction direction, the low-level branch holes are symmetrically distributed on two sides of the main hole 5 at equal intervals.
The hole opening space and the final hole space between the low-level branch hole and the high-level branch hole adjacent to the low-level branch hole are X 1 That is, the hole opening distance and the final hole distance of two adjacent low branch holes are both 2X 1 (ii) a The projection lengths of the curve section and the straight line section on the horizontal plane of each low-position branch hole are also X 1 I.e. the projection length of each low branch hole on the horizontal plane is 2X 1 ；X 1 The value range of (A) is preferably 50 to 100m.
In the low-position branch holes, the projection of the final hole point of the former low-position branch hole on the horizontal plane is coincided with the projection of the opening point of the adjacent latter low-position branch hole on the horizontal plane, namely the sum of the projection lengths of all the low-position branch holes is the total length of the return airway 3 of the stope face, thereby ensuring that the low-position branch holes can be extracted and recoveredThe height of the top plate of the mining face is h K The above fissure zone gas.
3) In the direction perpendicular to the working face extraction direction
Referring to fig. 2, the low-level branch hole is divided into a low-level branch hole on the side close to the extraction face (hereinafter referred to as "extraction-side low-level branch hole 8") and a low-level branch hole on the side close to the coal roadway (hereinafter referred to as "coal roadway-side low-level branch hole 9"). The projection of the low-level branch hole 8 on the extraction side on the horizontal plane is recorded as Y as the high-level branch hole 1 Recording the projection of the low-level branch hole 9 on the horizontal plane as Y 2 。
Projection Y of low-level branch hole 8 at extraction side and low-level branch hole 9 at coal roadway side on horizontal plane 1 、Y 2 The pressure relief discharge belt width of the stope face air return roadway 3 and the width of the stope face cutting hole 4 are respectively not less than one third, namely Y 1 ≥Y/3-L 1 、Y 2 ≥L 1 +W+Y p 。
(3) Construction high and low branch hole
The construction design of the branch hole can be realized by inputting the parameters into the construction parameter design software of the intelligent drilling machine, and the construction is carried out according to the design requirement.
The construction adopts a retreating type construction method, namely after the main hole 5 is drilled to reach the expected depth, the branch holes are constructed in sequence in the retreating process. The primary drilling is adopted, the rotary drilling is adopted, and the drilling tool for drilling the holes is combined into a phi 98mmPDC drill bit and a phi 73mm common rotary drill rod.
And step 3: and connecting the gas extraction pipeline 13 to extract gas.
Referring to fig. 1 and 3, the directional branch long drill hole of the coal seam roof fissure zone with the constructed working face is connected to an extraction pipeline 13 for extraction, and the gas of the whole roof fissure zone is extracted in the working face stoping process, so that the gas of the coal seam roof fissure zone is extracted in a three-dimensional manner.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (7)
1. A three-dimensional gas extraction method for a coal seam roof fissure zone is characterized by comprising the following steps: the method comprises the following steps: s1, designing and constructing a main hole (5) of a directional branch long drilling hole of a coal seam roof fissure zone; s2, designing and constructing branch holes of the directional branch long drill holes of the coal seam roof fissure zone; s3, connecting an extraction pipeline (13) to extract gas;
in the step S1, in the coal seam inclination direction, the main hole (5) is arranged in the middle of the pressure relief area after the recovery of the working face, and the main hole is bounded by the lower coal wall of the return air roadway (3) of the recovery working face close to the recovery side and is separated by L 1 Distance is the optimum construction position, L 1 The calculation formula of (2) is as follows:
L 1 ＝[Y/3-h/tan(α+β)]÷2；
in the formula: l is 1 The optimal construction position of the main hole in the coal seam inclination direction is defined as m; alpha is the inclination angle of the coal bed and is expressed by degree; beta is a roof overlying rock pressure relief angle with the unit of degree; y is the width of the cutting hole of the stope face and the unit is m; h is the vertical distance between the main hole and the coal seam roof and the unit is m;
in the vertical direction of the coal bed, the main hole (5) is arranged at the topmost end of the top plate fissure zone;
in the step S2, the branch holes of the directional branch long drill hole of the coal seam roof fissure zone comprise high-position branch holes and low-position branch holes which are alternately arranged along the extension direction of the main hole (5);
the high-level branch hole is divided into a high-level branch hole (6) at the extraction side and a high-level branch hole (7) at the coal roadway side; in the working face extraction direction, the extraction side high-level branch holes (6) and the coal roadway side high-level branch holes (7) are distributed on two sides of the main hole (5) at equal intervals and symmetrically; in the vertical direction of the coal bed, the height of the final hole point of the high-level branch hole (6) at the mining side and the high-level branch hole (7) at the coal roadway side is h K +0.5h L (ii) a In the formula: h is K Vertical height of the collapse zone in m; h is L Vertical height of the fracture zone in m; in the direction vertical to the working face, the coal roadway side is highConstruction range Y of branch hole (7) 2 The gas discharge zone of the return airway (3) of the stope face is covered, and the calculation formula is as follows: y is 2 ≥L 1 +W+Y p (ii) a In the formula: w is the width of the return airway of the stope face, and the unit is m; y is p The width of a gas discharge zone of a return airway of a stope face is m;
the low-level branch hole is divided into a low-level branch hole (8) at the extraction side and a branch hole (9) at the coal roadway side; in the working face stoping direction, the stoping side low-position branch holes (8) and the coal roadway side branch holes (9) are distributed on two sides of the main hole (5) at equal intervals and symmetrically; in the vertical direction of the coal bed, the final hole heights of the low-level branch hole (8) at the extraction side and the side-level branch hole (9) at the coal roadway side are h K (ii) a In the extraction direction of the vertical working face, the projection length of the extraction side low-level branch hole (8) in the horizontal direction is Y 1 ，Y 1 The following requirements should be satisfied: y is 1 ≥Y/3-L 1 (ii) a The projection length of the coal roadway side low-level branch hole (9) in the horizontal direction is Y 2 ，Y 2 ≥L 1 +W+Y p 。
2. The method for three-dimensional extraction of gas in the coal seam roof fissure zone according to claim 1, characterized by comprising the following steps: in step S1, the vertical distance h = h between the main hole (5) and the coal seam roof K +h L 。
3. The method for three-dimensional extraction of gas in the coal seam roof fissure zone according to claim 1, characterized by comprising the following steps: in the step S1, a large-diameter primary hole forming technology is adopted in the construction of the main hole (5), and the length of the main hole (5) is not less than the length X of the stope face in the coal seam trend direction.
4. The method for three-dimensional extraction of gas in the coal seam roof fissure zone according to claim 1, characterized by comprising the following steps: in step S2, the hole opening distance and the final hole distance between the high-position branch hole and the adjacent low-position branch hole are X 1 ，X 1 The value range of (A) is 50-100 m.
5. The coal seam roof fissure zone tile of claim 1The three-dimensional extraction method is characterized by comprising the following steps: in the step S2, the high-position branch hole and the low-position branch hole both comprise a curve section and a straight line section connected with the curve section; the projection lengths of the curve sections on the high-position branch hole and the low-position branch hole on the horizontal plane are X 1 The projection lengths of the straight line segments on the high-position branch hole and the low-position branch hole on the horizontal plane are X 1 ，X 1 The value range of (A) is 50-100 m.
6. The method for three-dimensional extraction of gas in the coal seam roof fissure zone according to claim 5, characterized by comprising the following steps: the projection of the final hole point of the previous high-position branch hole on the horizontal plane is coincident with the projection of the opening point of the next high-position branch hole on the horizontal plane.
7. The method for three-dimensional extraction of gas in the coal seam roof fissure zone according to claim 5, characterized by comprising the following steps: the projection of the final hole point of the former low-position branch hole on the horizontal plane is coincident with the projection of the opening point of the latter low-position branch hole on the horizontal plane.
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