Site soils in southern area of Jiangsu province belong to washland sediment or limnetic facies sediment.The components of sediment are very complex and process of sedimentation is in disorder.

苏南区主要漫滩相、湖沼相或冲湖相新近沉积软弱,结构散,沉积零乱,成分复杂,饱水可液化粉细砂层及粉层育,在震或动力荷载的作用下有可能生软震陷或砂液化。