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株岭坳铁矿井下巷道断面 8～ 10m~2,巷道穿过的岩层多为绿泥石粉砂岩,夹有厚度约为1～2cm的薄层砂岩,岩石硬度系数f=4～6。岩层被大小断层多次破坏,大部分巷道有间断滴水,绿泥石粉砂岩遇水后软化成为一种淡绿色细致的白泥,易发生冒顶片邦。为了加固围岩,在巷道施工时曾大量采用喷锚支护,从1974～1977年,先后用喷锚方法支护巷道1986m,喷射混凝土857m~3,采用锚杆400根,钢筋网5400m~2。
The cross-section of underground tunnel of Zhuling Coelite Mine is 8～10m~2. The rock layers passing through the roadway are mostly chlorite siltstone with thin sandstone with a thickness of about 1～2cm, and the rock hardness coefficient f=4～6. The rock strata were destroyed several times by small and large faults, and most of the roadways had intermittent drips. After the chlorite siltstones met water, they softened into pale green and fine white mud, and they were prone to collapse. In order to reinforce the surrounding rocks, a large number of injection-anchored supports were used during roadway construction. From 1974 to 1977, 1986m of roadways was supported by spray-anchoring methods, and 857m~3 shotcrete was used. 400 anchor rods and 5400m~2 steel mesh were used. .