The ground collapse and cracks caused by underground mining severely threaten the safe in production and destroy the surface environment.
地下采矿引起的地表塌陷和裂缝，严重威胁矿山生产安全，破坏地表生态环境。
Ground collapse will seriously threaten the mine production security and destroy the surface ecological environment.
地表塌陷严重威胁着矿山安全生产，破坏地表生三态环境。
Discussed rock mass gravity collapse mechanism caused by under ground and overburden failure and surface settlement disaster, offered some underground mining and surface protective measures.
论述了地下矿层开采引起的岩体重力变形机理和造成的覆岩破坏、地表沉陷等灾害，提出了井下开采和井上防护的技术措施。
Liujiang basin is an important water source area of Qinhuangdao city. The surface collapse will happen at hidden karst areas, due to much exploiting of ground-water.
柳江盆地是秦皇岛市的重要水源地，由于大量开采地下水，在隐伏岩溶发育区将引起地表塌陷。
In excavation of shallow buried tunnel, it should be carry out to decrease the footage to prevent collapse, which shall benefit to diminish the settlement of ground surface.
浅埋隧道开挖时应严格控制地表沉陷，减小循环开挖进尺和防止塌方。
Pipe plies are installed from the ground surface to control the collapse of the plastic-flow ground;
采用地表管桩控制软流塑状围岩的溜塌；
Pipe plies are installed from the ground surface to control the collapse of the plastic-flow ground;
采用地表管桩控制软流塑状围岩的溜塌；
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