杭州地区软土层动力特性研究

Study on Soft Soil Characteristics of the Hangzhou Region

通过对杭州地区典型软土层(第一、第二软土层)土质力学特性、动剪切模量比和阻尼比的分析,详细探讨了杭州地区第一、第二软土层压缩指标、抗剪强度指标与物理指标之间的分布规律和相关性,拟合了相应的经验回归公式。通过试验发现了第一、第二软土层动剪切模量比G/Gmax、阻尼比λ与剪切应变γ之间的关系,并利用Martin-davidenkov模型和陈国兴等建议的阻尼比经验公式进行了验证和拟合,给出了拟合曲线和拟合参数推荐值,从而得到小应变条件下,杭州地区软土层动剪切模量比G/Gmax和阻尼比λ随剪切应变γ变化的参考值,有利于杭州地区第一、第二软土层动力特性的认识,可供实际工程借鉴使用。

According to the analysis of soil mechanical characteristics,the ratio of dynamical shearing modulus and damping ratio of typical soft soil in Hangzhou area and the particular discussion of the distribution rule and correlation of compression indices,shearing strength indices and physical status indices of the first and second layers of soft soil in Hangzhou area,the relative empirical regression formula is attained.Testing results show that the relationship of dynamic shear modulus ratio（G/Gma）xand damping ratio（λ）and dynamic shear strain（γ）of the first and second layers of soft soil.Further fitting curve and recommending values of fitting parameters are obtained based on the model of Martin-davidenkov and the empirical damping ratio formula suggested by Chen Guoxing,which followed by the coming into possession of the recommended values of dynamic shear modulus ratio（G/Gma）xand damping ratio（λ）versus dynamic strain（γ） for those two typical soft soils in Hangzhou area with the minimum strain condition that benefits the further understanding of the dynamic characteristics of those two typical soft soils and being used in the practical projects,but the proposed values can only be used as reference because of the complexity of damping ratio（λ）and dynamic shear modulus（G）.