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.

苏南地区场地为漫滩相、湖沼相或冲湖相新近沉积软弱,结构散,沉积零乱,成分复杂,饱水可液化粉细砂及粉为发育,在地震或动力荷载的作用下有可能发生软震陷或砂液化。