摘要
根据黄土的沉积历史及强度性质建立了黄土的破坏条件,该条件在p--q平面上仍采用莫尔库仑条件,在p平面上满足形状函数一切条件,只需做常规三轴压缩和常规三轴挤长试验就可确定该条件的所有参数;依据非饱和土有效应力新表达式,提出了三维应力状态下有效应力参数的确定方法;用所做的非饱和原状黄土真三轴试验资料验证了该条件的适应性;将该条件与改进的条件、双园弧条件、Willam和Warnke条件比较,发现该条件在应用于黄土方面优于其它条件。
In this paper, a failure criterion for unsaturated loess is set up according to the deposit history and strength characteristics of loess. It satisfies the Mohr-Coulomb failure criterion on p-q plane and the whole condition of shape functions on p plane. All parameters can be determined for this failure criterion with conventional triaxial compression tests and triaxial extension tests. The method for determining the effective stress parameters is presented according to the new effective stress expression of unsaturated soil under three-dimensional stress state. Moreover, the adaptability of the failure criterion for loess is verified with experimental data from true triaxial tests on intact unsaturated loess. It is found that the failure criterion is better than other failure criteria, such as the improvement criterion, double circular slip criterion, and Willam & Warnke criterion.
出处
《工程力学》
EI
CSCD
北大核心
2004年第2期167-172,共6页
Engineering Mechanics
基金
国家863计划项目(2001AA242071)
关键词
岩土工程
黄土
非饱和土
有效应力
破坏条件
geotechnical engineering
loess
unsaturated soil
effective stress
failure criterion
