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为研究广义塑性模型在海洋砂土中的适应性,采用静、动三轴仪对海洋砂土进行了固结排水剪切及固结不排水循环剪切试验,根据试验结果拟合出砂土的广义塑性模型参数,并利用此参数对动模量和阻尼比试验进行了数值模拟,比较了试验结果与模型拟合结果的差异。结果表明,计算结果与试验测定的动模量、阻尼比与动应变的变化规律一致,该模型能很好地反映砂土单调加载的应力-应变特性及小应变阶段的循环加载条件下的变形特性。
In order to study the adaptability of generalized plastic model in marine sandy soil, static and dynamic triaxial apparatus were used to carry out consolidated drainage and shear consolidation and undrained cyclic shear test of marine sandy soil. According to the experimental results, The parameters of the generalized plastic model are used to simulate the dynamic modulus and damping ratio tests. The differences between the experimental results and the model fitting results are compared. The results show that the calculated results are consistent with the dynamic modulus, damping ratio and dynamic strain. The model can well reflect the stress-strain characteristics of monotonic sand loading and the deformation under cyclic loading in the small strain stage characteristic.