Design method of optimal coal pillar alternate distance of shallow buried multi-seam working face

Abstract

The invention provides a design method of the optimal coal pillar alternate distance of a shallow buried multi-seam working face. The reasonable coal pillar alternate distance of an upper coal seam and a lower coal seam is determined through a terrestrial surface displacement law and a coal pillar concentrated stress propagation law, the stress concentration area of the upper coal seam is avoided, the disturbance of ground depression happening after shallow buried multi-seam mining is reduced, terrestrial surface concentration cracks are avoided, terrestrial surface uniformly sediments, and an environment-friendly development method integrating safe mining and terrestrial surface damage reduction is provided for shallow buried multi-seam mining.

Description

technical field [0001] The invention belongs to the technical field of coal mine mining, and in particular relates to a design method for the optimum coal pillar stagger distance in the working face of a group of shallow coal seams. Background technique [0002] The mining of shallow coal seam groups mainly involves two technical problems that interact with each other: one is that the coal pillars of the upper coal seam form concentrated stress, which causes serious deformation and damage to the mining roadway in the lower coal seam, and roadway support is difficult; The coal seam is buried shallowly, and the mining cracks and surface subsidence caused by the mining of the upper coal seam will continue to aggravate 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 influence of the concentrated stress of coal pillars, and less attenti...

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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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