郑州饱和粉土动剪切模量的试验研究

Experimental Investigation on Dynamic Shear Modulus of Saturated Silt in Zhengzhou

土的动剪切模量是土动力特性非常重要的参数,动剪切模量与剪应变的关系是研究土动力特性规律的必不可少的内容之一。动剪切模量和动剪应变的关系模型可以用来描述土的动应力-动应变关系。试验选取郑州市粉土作为试验土样,并制备重塑土样,在不排水条件下使用GDS共振柱仪对饱和粉土进行动力试验,测得土样在10-6~10-3小应变范围内的动剪切模量与动剪应变。进而选用H-D模型和Davidenkov模型,对试验数据进行拟合回归分析,结果表明,Davidenkov模型能更好地描述郑州饱和粉土的动剪切模量比（G/Gmax）与动剪应变（γ）的关系。该研究可为粉土动力模型的选取和地震分析提供一定的参考依据。

The dynamic shear modulus of soil is an important parameter of dynamic characteristics of soil,the relationship between the dynamic shear modulus and the dynamic shear strain is one of the essential contents to research dynamic characteristics of soil. The relation model between the dynamic shear modulus and the dynamic shear strain can describe the dynamic relation between stress and strain. The soil sample in the experiment was selected from silt in Zhengzhou,and was prepared to remolding soil samples,the saturated silt was made a dynamic test under the undrained condition with GDS Resonant Column Apparatus,the dynamic shear modulus and the dynamic shear strain of soil sample in a small strain range of 10- 6~ 10- 3were measured. The relationship curve between the ratio of dynamic shear modulus G / Gmaxand the dynamic shear strain γ was conducted regression analysis with H-D fitting model and Davidenkov fitting model,and the result showed the better fitting model of saturated silt was Davidenkov model. The research results could provide a reference for the selection of the dynamic model of silt and seismic analysis.