A Design Method for Optimum Coal Pillar Stagger in Shallow Coal Seam Group Working Face

Abstract

The present invention provides a design method for optimal coal pillar stagger distance in shallow coal seam group working face, through the law of surface movement and the propagation law of coal pillar concentrated stress, reasonable upper and lower coal seam coal pillar stagger distance is determined, and in terms of avoidance At the same time, the stress concentration area of ​​the coal seam reduces the disturbance of the surface subsidence after mining the shallow coal seam group, avoids the generation of concentrated cracks on the surface, and makes the surface subside evenly. Environmentally friendly mining methods.

Description

Technical field [0001] The invention belongs to the technical field of coal mining, and in particular relates to a design method for the optimal coal pillar stagger distance of a shallow coal seam group working face. Background technique [0002] The mining of shallow coal seams mainly involves two technical problems that affect each other: one is the formation of concentrated stress on the coal pillars of the upper coal seam, which causes serious deformation and damage to the lower coal seam, and it is difficult to support the roadway; the second is the mining of shallow coal seams. The coal seam is shallowly buried, and the mining cracks and surface subsidence caused by the mining of the upper coal seam continue to intensify during the repeated mining of the lower coal seam, causing serious damage to the surface. [0003] For a long time, the research on the mining of deep coal seam groups has mainly focused on the impact of the concentrated stress of the coal pillars, and has se...

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Problems solved by technology

[0005] The purpose of this invention is to solve the problem that the existing shallow coal seam group mining technology cannot take into account both safety production and surface environmental protection, starting from the different coal pillar stagger distances in the upper and lower coal seam working faces, and revealing the concentrated stress of the upper coal seam coal pillar through physical similar simulation experiments Propagation law and surface subsidence law, to determine the optimal coal pillar stagger range in the upper and lower coal seam coal mining face, which can reduce the difficulty of roadway support in the lower coal seam and the uniform settlement of the ground surface, and propose a method that can take into account safety production and surface The Design Method of Optimum Coal Pillar Staggering for Environment-Friendly Mining of Shallow Coal Seam Groups

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