The surrounding rock of roadway is a compound structure consisted of roof, floor and sides. The sides of extraction opening are the weak coal mass, which affect the stability of floor directly.
巷道围岩是由顶板、底板、两帮组成的复合结构体，回采巷道两帮为软弱煤体，直接影响到底板的稳定性。
Up a dark, winding staircase lies a shabby room, lit only by a small window set into the sloping roof which throws a weak square of daylight onto the bare wooden floor beneath.
在曲折幽暗的楼梯尽头有间破败的顶楼小屋，屋内只有嵌在斜顶上的一扇小窗在空荡荡的木地板上投下淡淡的一方阳光。
Can be seen surrounding rock structure of the typical pattern of damage to the roof and floor of bending damage and a broken pillar along the main damage to the weak side slip.
可见采场围岩结构的典型破坏模式以顶底板的弯曲折断破坏和矿柱沿弱面滑移破坏为主。
Can be seen surrounding rock structure of the typical pattern of damage to the roof and floor of bending damage and a broken pillar along the main damage to the weak side slip.
可见采场围岩结构的典型破坏模式以顶底板的弯曲折断破坏和矿柱沿弱面滑移破坏为主。
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