Method for slowing longwall mining pressure appearance of shallow coal seam below gully

Abstract

The invention belongs to the field of mineral engineering, and in particular relates to a method for slowing the longwall mining pressure appearance of a shallow coal seam below a gully. In order to solve the problem of longwall mining pressure appearance abnormality of the shallow coal seam below the gully, the invention proposes that the development situation of a ground surface gully needs to be taken into consideration as an important influence factor when shallow coal seam longwall mining is performed in a gully development area. According to a propagation angle and an overburden rock breaking angle, the mining influence area of the gully is divided into an influence-free area, an influence area and a strong influence area; the determination of the position of a stop line of gully-avoiding mining and the arrangement of a working surface of gully-along mining are based on the following principles: during the gully-avoiding mining, the position of the stop line is positioned out of the strong influence area; during the gully-along mining, the boundary position, close to one side of the gully, of the working surface is in the area where the overburden rock height is more than the fissure area height. The method involves few calculation parameters, facilitates field implementation, has high safety, and can be widely applied to large-scale safe mining of the shallow coal seam below the gully.

Description

technical field [0001] The invention belongs to the field of mining engineering, and in particular relates to a method for alleviating the appearance of mine pressure in longwall mining of a shallow buried coal seam under a buffer ditch. Background technique [0002] With the continuous implementation of the national policy of developing the western regions of our country, the development focus of my country's coal resources has begun to shift to the western regions. Compared with the Southwest Coalfield, the Northwest Coalfield has sparse surface vegetation, weak water and soil conservation capacity, serious surface water erosion, vertical and horizontal gullies, large changes in slope shape, fragmented terrain, and a relative height difference of more than 100 meters. Most of them are gully development areas. . The unfavorable impact of surface relief on coal seam mining has been confirmed by more and more theoretical research and engineering practice. For example, durin...

AI Technical Summary

Problems solved by technology

During the longwall mining of shallow coal seams under gullies, the existing technical measures have problems of poor safety and high cost due to a series of abnormal mine pressure phenomena such as support crushing and severe coal wall spalling, which seriously affect the safety of the mine. Safe Production

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