阜阳市地面沉降是典型的因抽汲松散岩层地下水引起水位（压）下降而造成的地面沉降。
The subsidence in Fuyang city is a typical examplpe for surface subsidence caused by groundwater pumping in loose soil.
由于软岩为强度低、孔隙度大、胶结程度差、含有大量膨胀性粘土矿物的松散、软弱岩层。
Because soft rocks have low strength and high porosity and contain large amount of expansive clay minerals, the freezing-thawing process of soft rock is complicated.
试验研究结果证实了自然分级现象是松散覆盖岩层客观存在的性质之一。
Test results confirmed that the classification phenomenon of natural grade was one of properties to determine where loose-covered rocks exist.
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