Pseudo-inclined variable-angle layout method for fully-mechanized mining/caving face in large-dip coal seam with variable angle

A layout method and technology of working face, which is applied in ground mining, earth square drilling, underground mining, etc., can solve problems such as complicated contact between support and roof, poor system stability, and difficulty in roof management, so as to achieve convenient implementation, ensure stability, well-designed effects

Inactive Publication Date: 2018-07-10
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a pseudo-inclination and variable-inclination arrangement method for large-inclination coal seam variable-angle fully-mechanized mining / caving working faces. The impact of changes (non-linear) causes complex contact between the support and the roof and is in an unreasonable position, which causes practical problems such as poor stability of the "support-surrounding rock" system and difficulty in roof management

Method used

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  • Pseudo-inclined variable-angle layout method for fully-mechanized mining/caving face in large-dip coal seam with variable angle
  • Pseudo-inclined variable-angle layout method for fully-mechanized mining/caving face in large-dip coal seam with variable angle
  • Pseudo-inclined variable-angle layout method for fully-mechanized mining/caving face in large-dip coal seam with variable angle

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Experimental program
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Effect test

Embodiment 1

[0042] When the stratum is an anticline, the pseudo-elevation variable dip angle is arranged, refer to Figure 1 to Figure 3 .

[0043] The first step: determine the layout parameters

[0044] 1. Choose to change the angle to the longwall working face AB 1 C 1 D. 1 As the actual mining working face of the high-inclination coal seam, the inclination angle of the upper area of ​​the working face is α 1 , the inclination angle of the middle area is α 2 , the inclination angle of the lower area is α 3 , α 1 2 3 , where the inclination angle α of the upper region 1 25°-35°, inclination angle α in the central area 2 35°-45°, the inclination angle α of the lower area 345°-65°.

[0045] In this embodiment, the inclination angle α of the upper region 1 is 25°, and the inclination angle α in the middle area 2 is 35°, the inclination angle α of the lower area 3 is 45°.

[0046] 2. The transition section between the upper area and the middle area is M, and the transition sec...

Embodiment 2

[0058] When the stratum is syncline, arrange the pseudo-inclination variable dip angle, refer to Figure 4 to Figure 6 .

[0059] The first step: determine the layout parameters

[0060] 1. Choose to change the angle to the longwall working face AB 1 C 1 D. 1 As the actual mining working face of the high-inclination coal seam, the inclination angle of the upper area of ​​the working face is α 1 , the inclination angle of the middle area is α 2 , the inclination angle of the lower area is α 3 , α 1 >α 2 >α 3 , where the inclination angle α of the upper region 1 45°-65°, inclination angle α in the middle area 2 35°-45°, the inclination angle α of the lower area 3 25°-35°.

[0061] In this embodiment, the inclination angle α of the upper region 1 is 45°, and the inclination angle α in the middle area 2 is 35°, the inclination angle α of the lower area 3 is 25°.

[0062] 2. The transition section between the upper area and the middle area is M, and the transition s...

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Abstract

The invention discloses a false-inclined inclination-angle-variable arrangement method for a large-dip-angle coal seam angle-variable fully-mechanized coal mining / caving working face. The method includes the following steps of using the large-dip-angle coal seam angle-variable working face as the actual mining working face to be arranged along a coal seam bottom plate in a true inclined mode, wherein the upper area, the middle area and the lower area of the working face are arranged into linear cutting holes, the angle transition section is arranged into an arc-shaped cutting hole, the circle center is located on the coal seam bottom plate (inclining backwards) or a coal seam top plate (inclining forwards); sequentially connecting the arc-shaped cutting hole and the linear cutting hole to form angle-variable cutting holes, conducting forward pushing according to regular circulation so that the working face haulage way can go beyond a front air return roadway by 8-12 m so that a false-inclined angle of 3-5 degrees can be formed for the working face. The method has the advantages that design is reasonable, the arrangement process is simple and convenient to implement, an angle-variable working face device is in the reasonable position and state, gradient of the working face is effectively reduced, stability of the working face 'support-surrounding rock' system is ensured, and the foundation is laid for achieving safe and efficient production of coal seams of the type.

Description

technical field [0001] The invention relates to a method for arranging a working face, in particular to a method for arranging a pseudo-inclination and variable-inclination angle of a large-inclination coal seam fully mechanized mining / caving working face. Background technique [0002] High-dip coal seam refers to a coal seam with a burial dip of 35°-55°, which is a type of coal seam with special burial conditions and a difficult-to-mine coal seam recognized by the international mining community. In the single-angle fully-mechanized mining (opening) mining of high-inclination coal seams, with the increase of the inclination angle of the coal seam, the tangential component force on the equipment on the working face increases, and the normal component force decreases. Phenomena such as toppling and frame shifting occur, and it is difficult to adjust the frame. Therefore, when arranging a single-angle working face in a large-inclination coal seam, the inclination angle of the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21C41/18
CPCE21C41/18
Inventor 王红伟伍永平曹沛沛高凯武会杰
Owner XIAN UNIV OF SCI & TECH
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