A roadway within ultra-close multiple-seams(RUCMSs) is one of the most difficult supported coal roadways to deal with in......

以官地矿近距离与极近距离的8#与9#煤层为研究背景,为了对其进行安全、经济的高回采率开采,采取理论计算与力学模型建立相结合的方......

针对极近距离的空间立体交叉巷道交错段的围岩控制,根据自稳隐形拱理论对上方巷道掘进对其下伏巷道造成的影响进行了理论分析,分析......

With the depletion of easily minable coal seams,less favorable reserves under adverse conditions have to be mined out to......