桂林理工大学学报2016，Vol.36Issue(4)：726-730,5.DOI:10.3969/j.issn.1674-9057.2016.04.013
红黏土损伤特性及损伤演化规律试验
Experiment of damage characteristics and damage evolution of red clay
摘要
Abstract
The triaxial undrained test of original red clay is conducted to investigate the stress-strain relationship of the red clay in Guilin.According to the characteristics of structural damage in red clay,damage variable D is determined.And the damage constitutive relations are verified by the damage evolution law of red clay.The results show that the characteristics of the ideal plastic are obviously exposed of the stress-strain relationship curves of the red clay in Guilin.Under the condition of different confining pressure,axial strain 1.36％ can be regarded as the threshold of the red clay strain threshold,and the corresponding stress as stress threshold.The initial elastic modulus and secant modulus related variables can be used as damage variable D.Damage variable with the increases of principal stress difference and in the basic linear relationship.The relation of damage variable exponential function and the axial strain shows that the red clay damage process is irreversible.The damage constitutive equation presented in this paper can better fit stress-strain curve of red clay,and reflects red clay structural damage under different confining pressure conditions.关键词
红黏土/三轴试验/损伤变量/损伤演化规律Key words
red clay/three axial test/damage variable/damage evolution law分类
建筑与水利引用本文复制引用
宋宇,黄翔,陈学军,白汉营,陈龙..红黏土损伤特性及损伤演化规律试验[J].桂林理工大学学报,2016,36(4):726-730,5.基金项目
国家自然科学基金项目(41262011 （）
41262011 （）
51369010) （）
广西重点实验室基金项目(11-kf-02 （）
11-CX-01 （）
12-A-01-02) （）
广西高校科学技术研究项目(KY2015YB119) （KY2015YB119）
