Under the natural drainage conditions of the mine shafts, the water level of the 4th aquifer lowers considerably. Thence, large area of ground subsidence occurs.
在矿井自然疏水条件下第四含水层(底含水层)水位大幅度下降，随之发生地表大面积沉降。
Under the natural drainage conditions of the mine shafts, the water level of the 4th aquifer lowers considerably. Thence, large area of ground subsidence occurs.
在矿井自然疏水条件下第四含水层(底含水层)水位大幅度下降，随之发生地表大面积沉降。
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