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、湖沼湖新近沉积软弱土,结构散,沉积零乱,成分复杂,饱水粉细砂层及粉土层较为发育,在地震动力荷载的作用下有能发生软土震陷砂土。