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。
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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