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上位煤层回采后留下的残余煤柱会在下位煤层造成应力集中带。在布置巷道时候,传统的做法的避开并保持一定水平距离。然而有些巷道不可避免的布置在煤柱下方,这就给巷道围岩控制带来了难题。为此,以山西龙门塔煤矿为工程背景,采用Flac3D分析了煤柱引起的区域应力场和位移场分布特征,具体研究了煤柱正下方9205运输巷的围岩控制思路和技术。为类似条件下巷道围岩控制提供了借鉴依据。
The residual coal pillar left after the mining of the upper coal seam will cause the stress concentration zone in the lower coal seam. In the layout of the roadway, the traditional approach to avoid and maintain a certain level of distance. However, some tunnels are inevitably arranged below the pillars, which brings difficulties to the surrounding rock control of the roadway. Therefore, based on the engineering background of Longmenta Coal Mine in Shanxi Province, Flac3D is used to analyze the distribution characteristics of regional stress field and displacement field caused by coal pillars. The control strategy and technology of surrounding rock of 9205 transportation lane directly under the coal pillar are studied. It provides a reference for surrounding rock control in similar conditions.