中文摘要：

依据先露采后井工联合开采的特点,确定煤层顶板中某一坚硬的岩层为关键层,并将关键层看作弹性地基上的梁,利用组合梁原理计算关键层梁的上部荷载,通过对关键层梁应力和变形的计算,得到其关键岩梁断裂在下部煤层中的应力分布规律,提出以边坡下巷道稳定为判断准则,确定井工开采工作面合理的停采线位置。利用该方法成功地解决了平朔矿区边坡下大巷稳定的问题。

英文摘要：

According to the characteristics of open pit mining firstly and the opencast-underground mining secondly,the most hard rock strata in coal seam is determined to be the key strata of mine,and the key stratum is considered as the beam of elastic foundation.The theories of combination girder are used to calculate the upper loads of key stratum.Based on the calculation of stress and deformation of key strata,the stress distribution rule in underlying coal seam in fracture of key strata is obtained,and the slope roadway stability is used as the criterion to set the reasonable position of terminal mining line at underground.By this method,the issues of large roadway stability under slope in Pingshuo mining area can be successfully resolved.