浅埋近距离一侧采空煤柱下切眼位置对推出煤柱压架灾害的影响规律

doi:10.13722/j.cnki.jrme.2014.10.008

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Abstract The crushing of supporting structures frequently occurs in the mining out coal pillar at the side of the upper goaf and in close distance to the working front of the shallow seams. The influence of the positions of hole-cut beneath the coal pillar was studied based on the mining practices at 4 working faces in Shigetai coal mine，Shendong mine area，China. A method of determining the cut-hole position was proposed to avoid the support crushing. As the positions of cut-hole are getting farther away from the edge of the coal pillar，the mode of the key stratum(KS) above the coal pillar varies in pushing out the coal pillar. The key stratum is stable initially，then starts to break like the cantilever. The periodic breaking occurred after the initial breaking leads to finally the occurrence of support crushing. Besides，if there is a KS in seams in close distance，this KS will affect the mode of breaking of the KS above the coal pillar. Total of 7 types in two categories of cut-hole positions were derived. The positions of cut-hole were proposed to ensure that the KS above the coal pillar would not break or its breakage would not cause the failure of supports.

Key words： mining engineering shallow seam close distance seams goaf-side coal pillar support crushing cut-hole position key stratum(KS)

Received: 07 October 2013

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2014.10.008 OR http://www.rockmech.org/EN/Y2014/V33/I10/2018

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