Experimental Study on the Small-strain Stiffness and the Damping Properties of Strong Structural Clay

4th International Conference on Energy Equipment Science and Engineering

Wang, Mingyuan^1 ; Shan, Zhigang^1 ; Sun, Miaojun^1 ; Wang, Kuanjun^1

Power China Huadong Engineering Corporation Limited, Hangzhou, Zhejiang

310012, China^1

关键词: Confining pressures;    Consolidation pressure;    Consolidation stress;    Dynamic shear modulus;    Inflection points;    Maximum dynamic shear modulus;    Small-strain stiffness;    Structural damages;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/242/6/062082/pdf
DOI  :  10.1088/1755-1315/242/6/062082

来源: IOP

【 摘 要 】

The small strain parameters of soil are important indexes for correct evaluation of the soil deformation. Based on the Stokoe resonant column system, the small strain dynamic characteristics of Zhanjiang strong structured clay under different consolidation stresses are investigated, including the dynamic shear modulus and damping ratio. Results show that under the same stress level, the maximum dynamic shear modulus of undisturbed soil is slightly larger than that of the remolded, and both of them decrease with the increase of shear strain. And the higher stress level is, the higher the maximum dynamic shear modulus would be, and the more significant the attenuation would be. As the shear strain increases to a certain extent, the damping ratio of the undisturbed soil increases sharply, but that of the remolded increases slowly. The maximum dynamic shear modulus of undisturbed soil shows a singular feature that it increases at the beginning and then decreases with the increase of effective confining pressure; and the inflection point corresponding to the effective confining pressure is larger than the structural yield stress of soil. The maximum dynamic shear modulus of the undisturbed soil is not only affected by the positive effect of the consolidation pressure and void ratio, but also affected by the negative effect of the structural damage induced by the stress level.