图11不同煤柱宽度塑性破坏特征
Fig.11Theplasticfracturecharacteristicsof
differentcoalpillarwidths
因此,大煤柱宽28~30m时煤柱沿倾向方向上垂直应力先增大后减小,煤柱两侧均有一定宽度的塑性区,煤柱中间存在弹性核区;当煤柱宽度较小时为6~8m时,虽煤柱内应力不高,但巷道周边的最大位移区域主要集中在煤柱帮部,巷道的水平位移远远大于大煤柱宽28~30mm的位移,煤柱已经被压垮,几乎无承载能力,不能保证巷道的稳定性,同时,煤柱破坏严重,容易导致采空区漏风、残煤自燃。综合考虑资源回收、巷道稳定性、次生灾害控制等因素,确定大采高综放工作面区段煤柱合理宽度为28m。
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