循环荷载作用下饱和黏土刚度衰减特性研究

摘要

海上风电基础设计中必须考虑海底土体在循环荷载作用下的软化效应，利用GDS动三轴仪进行不同围压、不同循环应力比和不同循环次数下土体的动三轴实验。将各因素进行归一化处理，采用回归方法分析土体剪切模量的衰减与这三者之间的关系，得出相应的计算模型并用相关数据验证，发现两者吻合较好。%Softening effect of saturated clay under cyclic loads must be considered when designing foundations of marine wind power structures .The dynamic triaxial experiments were conducted with different confining pressures ,cyclic stress ra-tios and times of cycles by using GDS dynamic triaxial system .And then the three factors were normalized to study the rela-tionship between the three factors and the shear modulus degradation by adopting regression analysis .Accordingly ,the cal-culation model was obtained and verified with relevant data .It was found that the model was in well accord with the data .