Roof strike relay drill hole arrangement structure for extracting goaf gas

Abstract

The utility model discloses a roof strike relay drill hole arrangement structure for extracting goaf gas, and belongs to the technical field of extraction drill holes. A plurality of groups of drill holes are obliquely formed between a top plate and a bending sinking zone; each group of drill holes comprises a plurality of upper-row drill holes and a plurality of lower-row drill holes; the hole forming positions of the plurality of upper-row drill holes and the plurality of lower-row drill holes in each group are the same point, and the final hole positions of the plurality of upper-row drill holes and the plurality of lower-row drill holes in each group are located in the boundary area of the fissure zone and the bending sinking zone; the length of the lower row of drill holes in each group is greater than that of the upper row of drill holes; the lower row of drill holes in the front group and the upper row of drill holes in the rear group are partially overlapped; according to the utility model, the problems of high cost, long construction period and complex management caused by lifting the drill site into the coal seam roof are solved, and the extraction effect is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of extraction drilling, in particular to a roof-direction relay drilling arrangement structure for extracting gas from goaf areas. Background Art

[0002] As we all know, among coal mine gas disasters, gas outburst in goaf is a serious disaster in underground coal mine production. It seriously threatens the safe production of coal mines, easily leads to excessive gas in the upper corner, causes the working face equipment to stop operating, and has a serious adverse impact on coal mine production.

[0003] At present, my country's coal mines mainly use methods such as pipe extraction, inclined drilling, roof strike drilling, high-extraction laneway, and tunnel-in-place (large-diameter directional roof strike drilling) to extract gas from goaf areas to prevent and control gas outburst disasters. Each of the above methods has its own advantages and disadvantages and applicable conditions. The following is a brief introduction to each method and explains its advantages, disadvantages and applicable conditions:

[0004] 1. Intubation to extract gas from goaf

[0005] This method is to lay a gas extraction pipeline on one side of the return air channel of the mining working face. One end of the pipeline is connected to the low-negative pressure extraction system, and the other end is placed in the open goaf to extract gas from the goaf. The advantage of this method is that the process and operation management are simple, and the disadvantage is that the extraction concentration is low. It is suitable for situations where the gas outburst in the goaf is not serious.

[0006] 2. Dip drilling to extract gas from goaf

[0007] In the return air chute of the mining face, close to the side of the mining face, a hole is drilled towards the lower boundary height of the fracture zone in the goaf. The end hole point is located at the lower boundary of the fracture zone. The inclination is calculated according to the lower boundary height of the fracture zone. The angle between the azimuth and the cutting direction is 10~20 degrees. The angle cannot be too large, otherwise it will be difficult to construct. The advantage of this method is that the construction and operation management are simple, and there is no need to dig a drilling site. The disadvantage is that the effective action time and distance of each borehole are short, the extraction effect is generally poor, and there is no good effect of drilling holes in the direction of the roof. Compared with drilling holes in the direction of the roof, the project volume is large, and the applicable conditions are similar to those of the intubation extraction method.

[0008] 3. Top plate direction drilling

[0009] This method digs a drill site in the return air chute of the mining face near the mining face, lifts the drill site into the coal seam roof, and the lifting height is guaranteed to not affect the support during mining in the cutting eye of the mining face. After the drilling site is constructed, a borehole parallel to the coal seam roof is constructed on the side of the drilling site near the cutting eye. The end hole point is generally located within the lower boundary of the fracture zone. Whether the boreholes between drilling sites overlap depends on whether the drilling sites are lifted to a suitable height to ensure that the drilling sites between drilling sites extract gas from the goaf uninterruptedly. The advantages of this method are higher extraction concentration, smaller drilling volume than inclined drilling, and continuous extraction. The disadvantages are large drilling volume, complex drilling site ventilation management, and limited extraction volume. When the outflow volume of the working face goaf reaches a certain amount, this method cannot solve the problem of upper corner overrun.

[0010] When using roof-direction drilling, in order to extend the effective drilling section, the drill site is generally raised to the coal seam roof. This can ensure that most of the boreholes are in the effective utilization section. However, the price paid for this is that the excavation work of the drilling site is huge, and the subsequent ventilation management is complicated, which brings more management costs to the mine and complicates the ventilation system of the mining face, which is not conducive to the safe production of the coal mine. Although directional drilling can solve the above problems, the cost of directional drilling is nearly 10 times that of ordinary drilling, and the technical requirements for construction personnel are also very high. Compared with the cost of raising the drilling site, it is not low, so it is not advisable.

[0011] 4. High extraction lane

[0012] The principle of extracting gas from goaf by high-extraction lane is similar to that of drilling in the direction of roof, except that lanes are used instead of drill holes. Its advantage is that it can significantly increase the extraction volume. This method can be used when the goaf gas outburst is large and cannot be solved by drilling in the direction of roof. The disadvantage is that the investment is large. It is suitable for situations where the gas outburst from goaf is large and cannot be solved by drilling in the direction of roof.

[0013] 5. Use Kong to replace Xiang

[0014] The method uses the same principle as high-extraction tunnel and roof direction drilling, but uses larger-diameter directional drilling to replace high-extraction tunnel. Currently, the largest directional large-diameter drilling hole is 300mm, and the hole depth can reach 500m. The advantage of this method is that the number of drilling sites is greatly reduced. Only 2 to 4 drilling sites are needed for one face, which is much less than the number of drilling sites for roof direction drilling. The extraction volume is also larger than that of roof direction drilling. The disadvantage is that the drilling construction efficiency is lower than that of ordinary drilling, and the investment is between roof direction drilling and high-extraction tunnel, which is relatively large. It is suitable for the gas outburst in the goaf that cannot be solved by roof direction drilling, and the use of high-extraction tunnel is a bit like a big horse pulling a small cart. Utility Model Content

[0015] The utility model overcomes the shortcomings of the existing technology and proposes a roof-oriented relay drilling arrangement structure for extracting gas from goaf areas. The utility model is achieved through the following technical solutions:

[0016] A roof-oriented relay drilling arrangement structure for extracting gas from a goaf, wherein above the goaf roof of a mining face are a caving zone, a fracture zone, and a curved subsidence zone in sequence; a plurality of groups of drill holes are obliquely arranged between the roof and the curved subsidence zone; each group of drill holes includes a plurality of upper-row drill holes and a plurality of lower-row drill holes located below the upper-row drill holes; the starting positions of the plurality of upper-row drill holes and the plurality of lower-row drill holes in each group are the same point, and the ending positions of the plurality of upper-row drill holes and the plurality of lower-row drill holes in each group are located at the boundary area between the fracture zone and the curved subsidence zone; the length of the lower-row drill holes in each group is greater than that of the upper-row drill holes; and the lower-row drill holes of the previous group overlap with the upper-row drill holes of the next group.

[0017] Furthermore, several upper rows of drill holes and several lower rows of drill holes in each group are arranged in a scattered manner, and several upper rows of drill holes in each group are on the same slope between the top plate and the curved sinking zone; several lower rows of drill holes in each group are on the same slope between the top plate and the curved sinking zone.

[0018] Furthermore, several groups of drill holes are evenly arranged along the direction of the fully mechanized mining working face.

[0019] Furthermore, one side of the mining face is the return air tunnel, and the other side is the transport tunnel; the drilling site of each group of boreholes is arranged in the coal wall on the side of the return air tunnel close to the mining face, and the drilling site floor and the return air tunnel floor are at the same level.

[0020] Furthermore, the length of the upper row of boreholes is 80 m, and the length of the lower row of boreholes is 120 m; the lower row of boreholes of the previous group overlaps with the upper row of boreholes of the latter group by 40 m.

[0021] The beneficial effects of the present invention compared to the prior art are as follows:

[0022] The utility model adopts a stepped drilling arrangement structure, arranges the drilling site in the coal wall on the side of the return air lane close to the mining working face, the drilling site floor and the return air lane floor are at the same level, and arranges the end point of the drilling hole in the boundary area between the fracture zone and the curved sinking zone, thereby ensuring the effective effect length of the drilling hole to the greatest extent.

[0023] The utility model does not raise the drilling site, which reduces the cost, and arranges two rows of drill holes in each drilling site. The upper row of drill holes is used to fill the blank area, and the final hole position is located above the fracture zone. The connection between the drilling sites is continuous, which solves the problem of discontinuity in the existing drilling hole arrangement structure and ensures the continuity of gas extraction in the goaf.

[0024] The utility model solves the problems of high cost, long construction period and complicated management caused by raising the drilling site to the coal seam roof and ensures the extraction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a top view of the roof-direction relay drilling arrangement structure for extracting gas from the goaf according to the utility model;

[0026] Figure 2 yes Figure 1 Center AA view.

[0027] Among them: 1. Mining working face; 2. Roof; 3. Caving zone; 4. Fracture zone; 5. Bending sinking zone; 6. Upper row of drill holes; 7. Lower row of drill holes; 8. Return air tunnel; 9. Transport tunnel. DETAILED DESCRIPTION

[0028] In order to make the technical problems, technical solutions, and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail with reference to the embodiments and accompanying drawings. It should be understood that the specific embodiments described herein are merely for the purpose of explaining the present invention and are not intended to limit the present invention. The technical solutions of the present invention will be described in detail below with reference to the embodiments and accompanying drawings, but the scope of protection is not limited thereto.

[0029] See also Figure 1 and Figure 2 This embodiment proposes a roof-direction relay drilling arrangement structure for extracting gas from the goaf. Above the goaf roof 2 of the mining face 1 are the caving zone 3, the fracture zone 4, and the curved sinking zone 5 in sequence; one side of the mining face 1 is the return air tunnel 8, and the other side is the transport tunnel 9.

[0030] Several groups of drill holes are arranged obliquely between the roof 2 and the curved subsidence zone 5; these groups of drill holes are evenly spaced along the direction of the mining face 1. The drilling site for each group of drill holes is located in the coal wall of the return air lane 8 on the side of the mining face 1, with the drilling site floor at the same level as the return air lane floor. Each group of drill holes includes several upper rows of drill holes 6 and several lower rows of drill holes 7 located below the upper rows of drill holes 6. The starting points of the upper rows of drill holes 6 and the lower rows of drill holes 7 in each group are at the same point, and the final positions of the upper rows of drill holes 6 and the lower rows of drill holes 7 in each group are located at the boundary between the fracture zone 4 and the curved subsidence zone 5. The upper rows of drill holes 6 and the lower rows of drill holes 7 in each group are arranged in a scattered pattern, with the upper rows of drill holes 6 in each group located on the same slope between the roof 2 and the curved subsidence zone 5; and the lower rows of drill holes 7 in each group located on the same slope between the roof 2 and the curved subsidence zone 5. This maximizes the effective length of each group of drill holes.

[0031] In this embodiment, the drilling site is not elevated, thereby reducing costs. However, a problem arises in that the connection between drilling sites is discontinuous. Therefore, it is necessary to change the arrangement of drilling holes to solve the problem of discontinuous connection. The arrangement adopted in this embodiment is to arrange two rows of boreholes in each drilling site. The upper row of boreholes 6 is used to fill the blank area. The end hole position is located at the upper part of the fracture zone 4 and at the boundary between the fracture zone 4 and the curved subsidence zone 5. The drilling length of the upper row of boreholes 6 is 80m; the length of the lower row of boreholes 7 is 120m, and the end hole point is located at the upper part of the fracture zone and also at the boundary between the fracture zone 4 and the curved subsidence zone 5.

[0032] The distance between the drilling sites is 80m, so that the lower row of drill holes 7 of the previous group overlaps with the upper row of drill holes 6 of the next group by 40m.

[0033] The construction method of the roof-oriented relay drilling arrangement structure for extracting gas from a goaf described in this embodiment is as follows:

[0034] 1. First, determine the heights of the three zones in the goaf of the mining face 1, namely the caving zone 3, the fracture zone 4, and the curved subsidence zone 5.

[0035] 2. Arrange the drilling site in the coal wall on the side of the return air roadway 8 close to the mining working face 1. The drilling site floor is at the same level as the return air roadway 8 floor. Arrange the end points of the upper row of drill holes 6 and the lower row of drill holes 7 at the boundary area between the fracture zone 4 and the curved sinking zone 5 to ensure the effective length of the drill holes to the greatest extent.

[0036] 3. Not raising the drilling site reduces costs, but the connection between drilling sites is discontinuous. Therefore, it is necessary to change the drilling arrangement to solve the problem of discontinuous connection. The method adopted is to arrange two rows of drill holes in each drilling site. The upper row of drill holes 6 are used to fill the blank area, and the drill hole length is 80m; the lower row of drill holes 7 is 120m long.

[0037] 4. The distance between drilling sites is 80m, ensuring that each group of drill holes overlaps by 40m, and advancing in a cycle to ensure the continuity of gas extraction in the goaf.

[0038] The drilling arrangement structure in this embodiment is aimed at the mining face with a flow rate of 10~30m 3 / min, the problem of excessive gas in the upper corner can be solved by drilling holes in the direction of the roof.

[0039] The above content is a further detailed description of the present invention in combination with a specific preferred embodiment. It cannot be determined that the specific embodiments of the present invention are limited to this. For ordinary technicians in the technical field to which the present invention belongs, they can make several simple deductions or substitutions without departing from the present invention, which should be regarded as belonging to the present invention and the scope of patent protection determined by the submitted claims.

Claims

1. A roof-direction relay drilling arrangement structure for extracting gas from a goaf, wherein the top of the goaf roof (2) of a mining working face (1) is followed by a caving zone (3), a fracture zone (4), and a curved sinking zone (5); characterized in that: Several groups of boreholes are arranged obliquely between the top plate (2) and the curved sinking zone (5); each group of boreholes includes several upper row boreholes (6) and several lower row boreholes (7) located below the upper row boreholes (6); the starting positions of the several upper row boreholes (6) and the several lower row boreholes (7) in each group are the same point, and the ending positions of the several upper row boreholes (6) and the several lower row boreholes (7) in each group are located in the boundary area between the fracture zone (4) and the curved sinking zone (5); the length of the lower row boreholes (7) in each group is greater than the length of the upper row boreholes (6); and the lower row boreholes (7) of the previous group overlap with the upper row boreholes (6) of the next group.

2. The roof-direction relay drilling arrangement structure for extracting gas from goaf according to claim 1 is characterized in that: The plurality of upper row drill holes (6) and the plurality of lower row drill holes (7) in each group are arranged in a scattered manner, and the plurality of upper row drill holes (6) in each group are on the same inclined surface between the top plate (2) and the curved sinking zone (5); and the plurality of lower row drill holes (7) in each group are on the same inclined surface between the top plate (2) and the curved sinking zone (5).

3. The roof-direction relay drilling arrangement structure for extracting gas from goaf according to claim 2 is characterized in that: Several groups of drill holes are evenly arranged along the strike of the mining face (1).

4. The roof-oriented relay drilling arrangement structure for extracting gas from goaf according to claim 1 is characterized in that: One side of the mining working face (1) is a return air tunnel (8), and the other side is a transport tunnel (9); the characteristic is that the drilling site of each group of boreholes is arranged in the coal wall on the side of the return air tunnel (8) close to the mining working face (1), and the drilling site floor and the return air tunnel floor are at the same level.

5. The roof-direction relay drilling arrangement structure for extracting gas from goaf according to claim 1 is characterized in that: The length of the upper row of boreholes (6) is 80m, and the length of the lower row of boreholes (7) is 120m; the lower row of boreholes (7) of the first group overlaps with the upper row of boreholes (6) of the second group by 40m.

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