横河煤矿 3#煤层厚度 8.8m左右 ,1131东顶分层长壁工作面面长 14 0m ,后退式回采 ,其二、三、四分层采用放顶煤采煤方法一次采出。当 1131东顶分层工作面距停采线还有2 0 0余米时 ,根据接续要求 ,必须准备 1134东放顶煤工作面 ,形成了顶分层后退开采 ,底分层巷道前进掘进的巷面 The thickness of No.3 coal seam of Henghe Coal Mine is about 8.8m, and the longwall face of 1131 East Top long-story layered longwall is 14 0m long. The second, third and fourth strata adopt the method of top coal caving once. When 1131 Dongding stratified working face is still more than 200m away from the stopping line, according to the connecting requirements, the 1134 East Top Caving Face must be prepared to form the top stratified reverse mining and the bottom stratified roadway forward heading Alleyway