Nonlinear Model of Soils Under Complex Stress Paths
Nonlinear Model of Soils Under Complex Stress Paths
复制标题
复杂应力路径下土壤的非线性模型
DOI：
10.1007/s10706-018-0522-y
复制
发表时间：
2018
影响因子：
1.7
通讯作者：
郑颖人
中科院分区：
文献类型：
--
作者：
董彤;孔亮;柘美;郑颖人
应力方向对土的静、动力学性质有明显的影响。这主要是因为岩土材料一般具有各向异性。力学分析表明，应力增量可分为共轴分量和旋转分量，其中剪应力和正应力在物理空间的耦合变化可用来衡量主应力的方向。根据剪应力与正应力的比值，提出了一种能够模拟复杂应力路径下土体变形特性的简单非线性模型。考虑土的初始剪切模量和峰值强度与土的各向异性和应力方向密切相关，建立了分量形式的本构模型的应力应变关系。复杂应力路径下的试验结果与预测结果的对比表明，新模型能较好地反映粘性土和散体材料的变形特性。
The direction of stress has an obvious influence on the mechanical properties of soils under the static and dynamic conditions. This is mainly because that geomaterials are anisotropic in general. Mechanical analysis shows that the increment of stress can be divided into the coaxial component and the rotational component of which the coupling change of shear stress and normal stress in the physical space can be used to measure the direction of the principal stress. In light of the shear-normal stress ratio, a simple nonlinear model which can simulate the deformation behavior of soils under complex stress path is proposed. The stress–strain relationship of the model in the form of component is established considering the initial shear modulus and the peak strength of soil which are closely related to the anisotropy of soil and the direction of stress. Comparisons of predicted and measured results of tests under complex stress paths show that the newly build model can capture deformation characteristics of cohesive soil and granular materials reasonable wells.