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.

苏南地区场地土主要为漫滩相、湖沼相或冲湖相积软弱土,结构松散,积零乱,成分复杂,饱水可化粉细砂层及粉土层较为发育,在地震或动力作用下有可能发生软土震陷或砂土化。