Down-dip mining method of shaped hydraulic bracket on long-wall working surface in direction of large dip angle coal bed

Abstract

The invention discloses a down-dip mining method of a shaped hydraulic bracket on a long-wall working surface in the direction of a large dip angle coal bed, comprising the following steps of: firstly, determining a false down-dip working surface: selecting a false down-dip working surface as the actual mining working surface of a large dip angle coal bed; and secondly, mining the coal bed: usingthe determined false down-dip working surface as the actual mining working surface and the large dip angle coal bed direction as the propelling direction to mine the large dip angle coal bed by usinga regular coal bed mining method, and synchronously supporting the actual mining working surface by using the shaped hydraulic bracket in the actual mining process, wherein the shaped hydraulic bracket comprises a top beam, a bottom plate and a plurality of support pillars, the top beam is in the shape of a parallelogram. The invention has reasonable design and simple mining method, adopts the shaped hydraulic bracket which has reasonable structure, convenience of operation and good using effect, and solves the problems of instability, low safety coefficient and large mining difficulty of a bracket-wall rock system existing in the mining process of the long-wall working surface in the direction of large dip angle coal bed.

Description

Technical field [0001] The invention relates to a method for mining a long-wall working face with a long-walled coal seam with a large inclination angle, in particular to an undercut mining method of a special-shaped hydraulic support for a long-wall working face with a large inclined coal seam. Background technique [0002] Highly inclined coal seams are part of inclined and steep coal seams. Specifically, coal seams with an inclination angle of 35° to 55° are difficult to mine coal seams. In the actual mining process, under the action of the inclined component force of the working face roof, the support and the equipment's own gravity, the working face support and the working face used in the traditional "strike longwall" mining method are arranged along the inclined direction of the coal seam and advance along the direction of the coal seam. The related equipment arranged will inevitably appear to slide and tip during the advancing process of the working face. At the same time...

AI Technical Summary

Problems solved by technology

In the actual mining process, under the action of the inclined component force of the working face roof, support and equipment's own gravity, the working face support and the working face support adopted in the traditional "toward longwall" mining method arranged along the inclined direction of the coal seam and advancing along the coal seam direction The relevant equipment arranged will inevitably slide and dump during the advancing process of the working face. At the same time, the unbalanced movement and filling of gangue after the roof of the working face collapses and the slippage after the bottom plate is damaged will intensify the pressure on the hydraulic supports and related equipment on the working face. The degree of slipping and toppling (or the possibility of slipping and toppling), so that the "support-surrounding rock" system in the process of mining the longwall working face from the high-inclination coal seam becomes an "unstable system", resulting in a large number of safety production accidents , and correspondingly caused a large number of casualties and economic losses

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