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在临界状态理论和边界面模型的框架内,引入结构性扰动对弹性变形、结构性屈服面大小、胶结吸力和屈服面各向异性的影响,建立一个基于扰动状态概念硬化参量的结构性黏土边界面模型。首先,通过定义3个结构扰动度R_c,R_b和R_a来定量反映塑性变形对结构性黏土的结构性屈服面、胶结吸力和屈服面各向异性的扰动程度,并对弹性特性进行各向异性和结构性影响的修正。然后,通过对天然沉积上海黏土和Vallericca硬黏土的三轴不排水剪切试验和一维固结压缩试验的模拟验证模型的预测能力。最后,通过模型与有限差分法相结合,以简单的平面应变试验模拟为例,展示模型能够描述结构扰动度的变化及其在土体中分布的模拟能力。
In the framework of critical state theory and boundary surface model, the influence of structural disturbance on elastic deformation, structural yield surface, cementing suction and yield surface anisotropy is introduced and a structural clay edge based on the concept hardening parameter is established Interface model. Firstly, three structural perturbations, R_c, R_b and R_a, are defined to quantitatively reflect the degree of perturbation of plastic deformation on the structural yield surface, the bond suction and the yield surface anisotropy of structural clay. The anisotropy of elastic properties and Correction of structural effects. Then, the predictability of the model was verified by simulating the three-axis undrained shear tests and the one-dimensional consolidation compression tests of natural sediments of Shanghai clay and Vallericca hard clay. Finally, by combining the model with the finite difference method, taking a simple plane strain test simulation as an example, the display model can describe the variation of structural disturbance and its simulation ability in soil distribution.