Non-coal-pillar mining method and system for partial filling of working face in large-dip-angle coal seam

Abstract

The invention discloses a non-coal-pillar mining method and system for partial filling of a working face in a large-dip-angle coal seam. The non-coal-pillar mining method comprises the steps that in the large-dip-angle comprehensive mining working face, hydraulic supports of the working face are arranged modularly in partitions according to a certain length, the upper part is a common support, andthe lower part is an integrated hydraulic support of mining and filling; a combined gangue retaining support is additionally arranged along a haulage way; with the recovery of the working face, artificial filling is conducted at the lower part of a goaf, grouting filling is conducted at surrounding rocks of the haulage way, and the haulage way is reserved; after the completion of mining, the reserved haulage way can be a tailgate of the working face in the lower section, and the mining system layout is achieved; and the above procedures are repeated, thus continuous mining is conducted untilthe completion of mining of the coal seam. According to the non-coal-pillar mining method, the surrounding rock state of the haulage way is improved, the stability of the remained gateway along the goaf is ensured, the non-coal-pillar mining of the large-dip-angle coal seam is achieved, the operation efficiency is improved, the resource recovery rate is increased, the mine pressure appearance intensity is reduced, the stability of the working face supports is improved, and the safe and efficient mining of the working face is ensured.

Description

technical field [0001] The invention designs a coal pillar-free mining method for partial filling of a large-inclination coal seam working face, and specifically relates to a coal-pillar-free gob-side entry retaining method and system for a high-inclination coal seam longwall working face. Background technique [0002] High-dip-angle coal seams refer to coal seams with a burial angle of 35°-55°, with proven reserves of about 180-360 billion tons and production of about 150-300 million tons, accounting for 10-20% of the country's coal reserves and production and 5-8%, is the main mining coal seam of many mines in Sichuan, Chongqing, Yunnan, Guizhou, Xinjiang, Gansu, Ningxia and other places in western my country. The safe and efficient mining of this type of coal seam has become a major engineering problem to be solved urgently. Therefore, it is of great significance to the development of regional economy to study the technology of roadway protection without coal pillars in th...

AI Technical Summary

Problems solved by technology

At present, coal pillarless mining of high-inclination coal seams is mostly based on the coal-pillarless mining methods of near-horizontal and gently-inclined coal seams. Therefore, during the implementation, there are often phenomena such as broken roadway surrounding rock, easy coal wall slabs, shearing and displacement between roadway roofs, and large span of transportation level roadway roofs, etc., and the actual application effect is not good.

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