开采沉陷观测
mining subsidence observation
开采沉陷模型
the model of mining subsidence
开采沉陷预计
mining subsidence prediction
开采地面沉陷
mining induced surface subsidence
三下开采风险决策
Under three mining risk decision
安全高效开采
safe and high-efficient exploitation
good safety and efficiency
按煤种分层开采
mining in slices according to coal rank