基于扰动状态概念硬化参量的结构性黏土边界面模型

发布时间：2018-02-24 00:04

本文关键词： 黏土结构性边界面模型扰动状态弹塑性　出处：《岩土工程学报》2017年03期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:In the framework of critical state theory and boundary surface model, the effects of structural disturbances on elastic deformation, structural yield surface size, cementation suction and yield surface anisotropy are introduced. A structural clay boundary surface model based on perturbed state concept hardening parameters is established. Firstly, the structural yield surface of plastic deformation on structural clay is quantitatively reflected by defining three structural disturbance degrees, R _ S _ c _ I _ b and R _ _ _. The degree of disturbance of the bond suction and yield surface anisotropy, and the modification of the anisotropic and structural effects of the elastic properties. The prediction ability of the model is verified by the triaxial undrained shear test and the one-dimensional consolidation compression test of natural deposited Shanghai clay and Vallericca hard clay. Finally, the model is combined with the finite difference method. Taking the simple plane strain test simulation as an example, it is shown that the model can describe the variation of the disturbance degree of the structure and the simulation ability of its distribution in the soil.
【作者单位】：同济大学岩土及地下工程教育部重点实验室;同济大学地下建筑与工程系;南特中央理工大学;
【基金】：国家自然科学基金项目(41372285,51579179) 国家重点基础研究发展计划(“973”计划)项目(2011CB013800)
【分类号】：TU43

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