一种改进的饱和黏土运动硬化边界面模型

发布时间：2018-08-31 15:40

【摘要】：为了模拟海洋风、浪等循环荷载下饱和黏土的循环稳定性,基于运动硬化准则建立改进的边界面模型.改进的模型中,基于硬化中心和边界面可移动的硬化准则,描述循环荷载引起土体的各向异性;以椭圆形边界面左端点对应的应力作为运动硬化变量,建立新型的边界面方程,以解决传统的边界面方程与该硬化准则不相适应的问题;在边界面方程中引入形状参数,以增加模型的灵活性;结合边界面的演化规律,提出一种详细的塑性模量插值方法,使模型能够真实地描述饱和黏土在低应力水平下的循环稳定特性.通过对不同固结应力和循环应力水平下累积偏应变随循环周次变化关系的预测,初步验证了改进模型的合理性;通过模拟结果与试验结果的对比,进一步验证了该模型的有效性.
[Abstract]:In order to simulate the cyclic stability of saturated clay under the cyclic loads of ocean wind and waves, an improved boundary surface model is established based on the motion hardening criterion. In the improved model, the anisotropy of soil caused by cyclic load is described on the basis of the hardening criterion that the hardening center and boundary surface can be moved, and the stress corresponding to the left end of the elliptical boundary surface is taken as the motion hardening variable, and a new boundary surface equation is established. In order to solve the problem that the traditional boundary surface equation is not suitable to the hardening criterion, the shape parameter is introduced into the boundary surface equation to increase the flexibility of the model, and a detailed interpolation method of plastic modulus is proposed according to the evolution law of the boundary surface. The model can describe the cyclic stability of saturated clay at low stress level. The rationality of the improved model is preliminarily verified by the prediction of the relationship between the cumulative deflection strain and the cycle under different consolidation and cyclic stress levels, and the comparison between the simulation results and the experimental results, The validity of the model is further verified.
【作者单位】：天津大学水利工程仿真与安全国家重点实验室;天津大学岩土工程研究所;
【基金】：高等学校博士点基金资助项目(20130032110045) 国家自然科学基金资助项目(51579174)~~
【分类号】：TU442

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