交叉巷道无煤柱开采矿压显现规律及控制对策研究

Law and control of mine pressure behavior in cross-roadway of non-pillar coal mining

以棋盘井煤矿(东区)11101运输巷为工程背景,对中厚煤层交叉巷道留巷矿压显现规律进行研究。通过数值模拟方法得到了交叉巷道留巷过程中的应力分布特征,并针对性地提出了围岩支护方案和矿压监测方案。结果表明:随着工作面回采,巷道交叉口处11101排水巷两侧应力集中的峰值差异越来越大,最后表现为巷道左侧的应力集中峰值大于右侧的应力集中峰值。巷道交叉口处顶板相较于其两侧,处于一种“弱稳定”状态,易受到工作面采动压力的影响。经过现场验证,巷道交叉口处的补强支护措施合理,达到了预期的要求。

Based on the engineering background of 11101 transport entry in Qipanjing Coal Mine(east district),the mine pressure behavior law of cross-roadway in entry retaining of medium thick coal seam is studied.The stress distribution characteristics in the entry retaining are obtained by numerical simulation,and the surrounding rock support scheme and mine pressure monitoring scheme are put forward.The results show that:with the working face mining,the peak value difference of stress concentration on both sides of 11101 extraction lane at the intersection of roadway is increasing,and finally the peak value of stress concentration on the left side of roadway is greater than that on the right side.The roof at the roadway intersection is in a weak-stable state compared to the both sides of the roadway intersection,which is likely to be affected by the mining pressure of the working face.Through the field verification,the reinforcement support measures at the roadway intersection are reasonable and meet the expected requirements.