含液各向异性多孔介质应变局部化分析  

Strain localization analysis of anisotropic saturated and partially saturated porous media

作　　者：张洪武[1] 周雷[1] 黄辉[1] 

机构地区：[1]大连理工大学工程力学系工业装备结构分析国家重点实验室,辽宁大连116024

出　　处：《岩土力学》2004年第5期675-680,共6页Rock and Soil Mechanics

基　　金：国家自然科学基金;杰出青年科学基金资助项目(NO.50178016;NO.10225212)。

摘　　要：工程中的含液多孔介质如饱和或非饱和岩土材料往往具有各向异性特性。采用Rudnicki建立的针对岩土材料的各向异性本构模型,对轴对称压缩试验中的含液多孔介质骨架的各向异性力学行为进行了分析;基于不连续分叉理论,导出了静态非渗流条件下处于轴对称应力状态的含液多孔介质应变局部化发生的临界模量、剪切带方向以及不连续速度矢量的显式表达式,在此基础上计算并讨论了材料参数变化和孔隙液体存在对各向异性多孔介质应变局部化的影响。The anisotropic mechanical behaviours are widely observed in the saturated and partially saturated geomaterials. This paper makes use of a anisotropic constitutive model developed by Rudnicki for geomaterials to model the anisotropic mechanical behaviors of saturated and partially saturated porous materials in axisymmetric compression test. Conditions for localization of strain into a shear band in fully and partially saturated porous media are derived based on the discontinuous bifurcation approach. Thecritical modulus, shear band angle and discontinuous velocity vector for localization of undrained condition in axisymmetric stress state are given in explicit forms. The effects of material parameters and pore fluid on localization are investigated in detail bynumerical computations.

关 键 词：各向异性 多孔介质 应变局部化 材料稳定性 分叉 

分 类 号：TU452[建筑科学—岩土工程] TB115[建筑科学—土工工程]