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。
Boulder: also bowlder, a large rounded mass of rock lying on the surface of the ground or embedded in the soil.
巨砾，圆石：在地表上或埋在土壤中的大而圆的岩石块些美国现代作曲家。
The deformation of ruptured rock mass is the mostly causation of ground subsidence over goaf.
废弃采空区破裂岩体变形是导致地表沉陷的主要原因。
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