A coal pillar-free mining method and system for partial filling of a large-dipping coal seam working face

Abstract

The invention discloses a coal pillar-free mining method and system for partial filling of a coal seam working face with a large dip angle. Support, the lower part is mining-filling integrated hydraulic support; along the transport level road, a combined gangue support is added; along with the working face mining, artificial filling is carried out in the lower part of the goaf and grouting is carried out in the surrounding rock of the transport level road, and the transportation Headway: After the mining is completed, the reserved transportation headway can be the return air headway of the working face in the lower section to realize the layout of the mining system; repeat the above process to continuously mine until the coal seam is mined. The invention improves the surrounding rock state of the transport level entry, ensures the stability of the gob-side retaining entry, realizes coal pillar-free mining of large-inclination coal seams, improves operation efficiency, improves resource recovery rate, reduces the intensity of mine pressure, and improves the stability of the support of the working face. Ensure safe and efficient mining at the working face.

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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