采煤塌陷
Coal mining subsidence
Mining subsidence
coal mining collapses
coal mining induced collapse
coal-mining subsidence land
Sinking Owing to Mining
采煤塌陷地
Subsidence land of coal extraction
Sunk area of coal mining
Coal mining subsidence land
subsided area of mining
the subsided land by coal mining
coal mining subsidence area
Coal mining subsidence
coal mine subsidence
subsidence area in coalfield
Mining subsidence
采煤塌陷坑
Collapse Pit Caused by Mining
采煤塌陷区
Subsidence area
Mining subsidence
Collapsed mine
coal mining subsidence area
excavating coal subsidence region
活鸡兔采煤塌陷区
Huojitu excavated coal pit
采煤采气一体化
Integrated Coal Mining and Gas Extraction
长壁综采放顶煤采煤方法
longwall fully mechanized overhead caving coal mining
次要开采阶段
Subordinate Phase of Production
放顶煤采煤法
Longwall Mining with Sublevel Caving
阶段采油速度
interval rate of production