水平应力对极近距离煤层回采巷道的影响分析  

Analyses on the Effect of Horizontal Stress on Mining Gateway in Ultra - Close Coal Seams

作　　者：李义宝[1] 康天合[1] 柴肇云[1] 张占春[1] 

机构地区：[1]太原理工大学采矿工艺研究所,山西太原030024

出　　处：《矿业研究与开发》2010年第4期3-4,29,共3页Mining Research and Development

基　　金：国家自然科学基金资助项目(50474057);太原理工大学校科技发展基金项目(12901203)

摘　　要：以五虎山矿9#、10#煤层赋存及开采地质条件为背景,运用数值模拟的方法对上层开采引起的底板应力分布规律进行研究,分析了水平应力对采空区F极近距离煤层回采巷道的影响。研究结果表明:采空区边缘所谓的"应力降低区"只是对于垂直应力而言,而在此区域的水平应力并非降低区,垂直应力最小处水平应力最大,垂直应力最大处水平应力最小;二者均在距采空区煤壁20m处趋于平稳。回采巷道在应力平稳区围岩变形最小,有利于巷道掘进及维护。According to the occurrence and mining conditions of 9 # and 10 # coal seams in Wuhushan mine,the distribution of floor stress caused by mining upper coal seam was researched with numerical simulation,the effect of the horizontal floor stress of upper coal seam on the mining gateway of the lower ultra - close coal seam under mined - out area was analyzed. The result of study showed that the so - called ＂ stress - relaxed area＂ in the edge of mined - out area is only to the vertical stress,but it is not horizontal stress - relaxed area. The place where the vertical stress is minimal but the horizontal stress is maximal,the place where the vertical stress is maximal minimal but the horizontal stress is minimal. The vertical stress and the horizontal stress tend towards stability at the place where is 20 meters away from the coal wall of mined - out area. If mining gateway is laid out in area of stable stress,the deformation of wall rock of gateway comes to last,it is favourable to the gateway drive and its mainte- nance.

关 键 词：水平应力 极近距离煤层 回采巷道 

分 类 号：TD714[矿业工程—矿井通风与安全]