作　　者： ;

机构地区： 深圳大学土木工程学院

出　　处： 《岩土力学》 2010年第6期1681-1686,共6页

摘　　要： 自然界的土体通常具有各向异性的特点,而传统的破坏准则大多只适用于各向同性的土体。结合应力张量和反映材料各向异性状态的组构张量,定义了修正偏应力及其不变量,提出了适用于各向异性土体材料的破坏准则。给出了共轴条件下正交各向异性和横向各向异性材料在一般应力空间的破坏曲线以及不同应力区中主应力系数b与摩擦角的关系曲线,并分析了它们的特性以及与各向同性材料相应曲线的区别。通过与真三轴试验数据的比较,表明该准则能很好地描述各向异性土体材料的强度特点。 Soil in nature is usually anisotropic,but most of the classical failure criteria can only take isotropic behaviors into account. A modified deviatoric stress tensor is defined,combining the stress tensor and the fabric tensor describing the characteristics of anisotropic materials. Based on the invariants of the modified deviatoric stress tensor,a failure criterion for anisotropic soils is proposed. Failure surfaces in the general stress space for the anisotropic and cross-anisotropic materials under coaxial conditions,as described by the criterion,and the relationships between the coefficient of intermediate principal stress b and friction angle in different sectors are presented. Their characteristics are analyzed and compared with those for isotropic materials. By comparing with the experimental data from true triaxial tests,the capability of the criterion in modeling the failure of anisotropic material is demonstrated.

关 键 词： 各向异性 破坏准则 组构张量 修正偏应力 不变量

领　　域： [建筑科学] [建筑科学]