密砂单剪试验的非共轴本构数值分析  

Numerical Analysis of Simple Shear Test on Dense Sand with Non-coaxial Constitutive Model

作　　者：罗强[1,2] 郑伟花[1] 

机构地区：[1]南阳师范学院土木建筑工程学院,河南南阳473061 [2]大连理工大学土木工程学院岩土工程研究所,辽宁大连116024

出　　处：《长江科学院院报》2015年第5期89-94,共6页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金项目(51079018;11202109);河南省科技攻关重点项目(112102310499);河南省教育厅科学技术研究重点项目(14B560023)

摘　　要：在土体主应力方向的旋转过程中,主应力方向与塑性主应变增量方向之间存在非共轴现象,传统的共轴本构理论无法合理描述非共轴现象及其对应力-应变关系的影响。通过有限元二次开发,在应变软化共轴模型的基础上引入了角点结构非共轴理论,对密砂的单剪试验进行数值模拟及分析,系统地研究了非共轴现象及其影响。数值分析结果与试验结果的对比表明:非共轴模型能够合理地反映非共轴现象及其影响,且非共轴现象受到静止侧压力系数、竖向应力和流动法则等因素的显著影响。In the process of rotation of the orientation of principal stress,the non-coaxial phenomenon exists between the orientations of the principal stress and plastic strain rate.However,the traditional constitutive theory could not reflect the non-coaxial phenomenon and its influence on the relationship between stress and strain.The yield vertex non-coaxial theory is adopted into a strain softening coaxial model to research the non-coaxial phenomenon and its influence in the numerical simulations of simple shear test on dense sand.Comparison between numerical result and test result suggests that the non-coaxial model could reflect the non-coaxial phenomenon and its influence reasona-bly,and also,the roles of non-coaxial model are considerably influenced by static lateral pressure coefficients,ver-tical stress and flow rules.

关 键 词：非共轴 本构理论 应变软化 单剪试验 数值分析 

分 类 号：TU411[建筑科学—岩土工程]