一种考虑应力洛德角剪切变形的三维双屈服面模型的初步研究  

A Preliminary Study for Three-dimensional Two Shear Deformation Yield Surface Mode Considering Stress Lode Angle

作　　者：王硕[1] 段新胜[1] 

机构地区：[1]中国地质大学(武汉)工程学院,湖北武汉430074

出　　处：《土木工程与管理学报》2013年第3期59-64,共6页Journal of Civil Engineering and Management

摘　　要：提出一种基于广义塑性力学的土体双屈服面本构模型,其双屈服面分别采用传统双屈模型中的体积屈服面和应力洛德角方向上的剪切屈服面。该模型通过硬化参数的积分变换方法来反映土体的剪胀特性,采用基于SMP准则的变换应力法或g(θ)方法将模型三维化以考虑应力洛德角对屈服面的影响。同时,本模型能够反映塑性应变增量方向与应力增量的相关性。该模型在一定程度上与基于广义塑性力学原理的三重屈服面模型是等价的,两者都基本能够反映土体压硬性、剪胀性和摩擦性等基本特性。最后,文中推导出了双屈本构方程的应力—应变刚度矩阵,以便数值计算。A soil constitutive model with two yield surfaces was proposed based on general plastic mechanics, one of which was traditional volumetric yield surface and the other one of which was the shear yield surface on Lord angle direction. By the integral transformation method of hardening parameters, shearing dilatancy of soil can be reflected with the model. The influence of Lode angle on yield surface can be considered by three dimensional presentation of the model based on SMP criterion transform stress method or g （0） method. Simultaneously, the model could reflect the correlation between the direction of plastic strain increment and stress increment. The model, to some extent, was equivalent to the triple-yield surface model based on the general plastic mechanics, both of them basically have the equivalent functions of the soil characteristics. They can reflect the soil basic characteristics of compressive harding , dilatancy and friction . Finally, the derivation of two-yield surface constitutive equation of the stress-strain stiffness matrix was given for the numerical calculation in this paper.

关 键 词：双屈服面 广义塑性力学 本构模型 变换应力 

分 类 号：TU432[建筑科学—岩土工程]