张双楼矿属大屯矿区,设计年产量120万吨,1979年动工,预计1986年投产。在井底车场副井以北的巷道硐室,于1984年初开始施工,其支护形式为料石砌(石旋)和架棚喷浆两种,巷道长300多米。这部分巷道处于松软破碎的泥岩中,由于地压较大,再加上泥 Zhang Shuanglou mine belongs to Datun mining area, designed annual output of 1.2 million tons, started in 1979, is expected to put into operation in 1986. The roadway north of the auxiliary well at the bottom of the well bottom started construction in early 1984 with two types of material support (stone rotating) and frame shedding. The roadway was more than 300 meters long. This part of the roadway is in soft shattered mudstone, due to the larger ground pressure plus mud