论文部分内容阅读
在曹村矿10#与11#极近距离煤层开采地质条件基础上,对上位10#煤开采后底板破坏深度及遗留煤柱下方应力分布情况进行了力学计算分析.计算结果表明,10#煤开采后引起的超前支承压力,对其底板最大破坏深度为26.1m,是两层煤间距的2.8倍;煤柱底板的应力分布具有显著的非均匀性.为了衡量煤柱下方底板内应力场的非均布情况,定义了应力场变化率系数ξ.考虑1.5倍的安全系数,并结合采用均布载荷计算得出的错距和底板破坏情况,确定11#煤209工作面回采巷道合理内错距为7.5m.现场应用表明,确定的内错7.5m布置较为合适,巷道支护效果较好,未出现强烈的矿压显现.
Based on the geological conditions of coal seam mining near 10 # and 11 # in Caocun Mine, the calculation of the failure depth of the upper floor and the stress distribution under the coal pillars after the upper 10 # coal mining are carried out. The calculation results show that 10 # The lead support pressure caused by mining has a maximum failure depth of 26.1m on the bottom floor, which is 2.8 times the spacing between two layers of coal. The stress distribution on the bottom of pillars is obviously inhomogeneous. In order to measure the stress field in the bottom floor of pillars Non-uniform distribution, the rate of change of stress field coefficient ξ is defined. Taking into account the safety factor of 1.5 times, combined with the calculation of the uniform load using load and the bottom plate failure, The distance is 7.5m. The field application shows that it is more appropriate to determine the 7.5m layout of the internal fault, and the roadway support effect is better, and no strong mine pressure appears.