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.

苏南土主要漫滩相、湖沼相或冲湖相新近沉积软弱土,结构散,沉积零乱,成分复杂,饱水可液化粉细砂层及粉土层较,在震或动力荷载的作用下有可能生软土震陷或砂土液化。