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为了从土体微观结构的角度定量地研究动剪切模量的性质和变化,利用共振柱试验,并借助电子显微镜及微观孔隙结构分析手段,对粤东重塑软黏土动剪切模量随动剪应变衰减规律与宏微观条件下土颗粒孔隙特性的关系进行分析。根据基于Davidenkov三参数模型的非线性回归分析和微观孔隙结构的参数计算分析,得到随固结应力增加,最大动剪切模量增大,连续介质中机械波波速增强;土体的宏观孔隙比降低;孔隙的层次增加,孔隙周长–面积分形维度值增加;孔隙的均一化程度增加,孔隙分形维度值减小。研究表明,Davidenkov模型中的初始参数、范围参数及速率参数与微观孔隙结构参数存在对应关系,为软黏土动力特性与微观结构关系的理论研究提供依据。
In order to quantitatively study the properties and changes of dynamic shear modulus from the perspective of soil micro-structure, the dynamic shear modulus of remodeled soft clay in eastern Guangdong with the use of the resonance column test, electron microscopy and microscopic pore structure analysis Dynamic shear strain attenuation law and macro-micro-conditions under the relationship between the pore characteristics of soil particles were analyzed. According to the nonlinear regression analysis based on the Davidenkov three-parameter model and the calculation and analysis of the microscopic pore structure parameters, the maximum dynamic shear modulus increases with the increase of the consolidation stress, and the mechanical wave velocity increases in the continuous medium. The macroscopic void fraction of the soil decreases The pore-level increases and the pore perimeter-area fractal dimension increases. The degree of homogenization of pores increases and the fractal dimension decreases. The study shows that the initial parameters, the range parameters and the rate parameters in the Davidenkov model correspond to the microscopic pore structure parameters, and provide the basis for the theoretical study on the relationship between dynamic properties and microstructure of soft clay.