循环荷载下软黏土的各向异性边界面模型

Anisotropic bounding surface model for saturated soft clay under cyclic loading

在各向同性边界面理论框架中,通过引入各向异性张量,提出了适用于描述循环荷载作用下软黏土各向异性的边界面本构模型。本模型通过初始固结应力状态确定各向异性张量的初始值,并通过各向异性张量的旋转硬化准则反映循环荷载作用下各向异性的演化。同时,在映射准则中,将映射中心由固定改为可移动,以反映循环荷载作用下土体的滞回特性。从而将一般边界面模型扩展,使其可描述复杂应力状态下饱和软黏土的动力特性。通过与上海软黏土的室内循环三轴试验结果以及文献中相关试验结果的比较,验证了所提出的本构模型的合理性。

Within the framework of isotropic bounding surface theory,an anisotropic model which introduces anisotropic tensor of soft clay under cyclic loading was formulated.The initial anisotropy of natural clays was described by properly assigning the initial value of the anisotropie tensor,which depends mainly on the initial stress state.The evolution of anisotropy reflecting the cyclic loading process was described by a rotational hardening law of the anisotropic tensor.Besides,mobile mapping origin was introduce...