中文摘要：

苏南地区的场地土主要为漫滩相、湖沼相或冲湖相新近沉积软弱土，结构松散，沉积零乱，成分复杂，饱水可液化粉细砂层及粉土层较为发育，在地震或动力荷载的作用下有可能发生软土震陷或砂土液化。通过对苏南地区淤泥质粉质粘土、粘土、粉质粘土、粉质粘土与粉细砂互层土、粉土、粉砂、细砂和中粗砂等8类新近沉积土155个原状土样历时4年的试验研究，给出了该地区上述8类新近沉积土的动剪切模量比G／Gmax和阻尼比D随剪应变幅值γ变化的平均拟合曲线及其参数的推荐值。为便于一般工程应用，给出了这8类新近沉积土的G/Gmax-γ，和D—γ关系曲线的推荐值及其标准差。

英文摘要：

Site soils in southern area of Jiangsu Province belong to washland sediment or limnetic facies sediment. The composition of those sediment are very complex and process of sedimentation is in disorder. In addition, saturated fine sand and silt distribute widely and phenomena of earthquake-induced soft settlement or sand liquefaction may happen. This paper analyzes the test results of 155 undisturbed samples of recently deposited soils from southern area of Jiangsu Province during four years including mucky silty clay, clay/silty clay, interbedded silty clay/ silty sand, silt, silty sand, fine sand and medium sand. The average fitting curves between dynamic shear modulus ratioG/Gmax as well as damping ratio D and shear strain amplitude γ , and their parameters in the empirical formula of G/Gmax -γ and D -γ curves for 8 types of soils mentioned above are presented. Moreover, this paper provides typical values and mean square deviation of the G/Gmax - γ and D - γ curves of the 8 types of soils for application of general engineering sites.