黄土的小形变本构特征及参数研究  

CONSTITUTIVE CHARACTERISTICS AND PARAMETERS OF SMALL DEFORMATION OF LOESS

作　　者：林斌[1] 赵法锁[2] 

机构地区：[1]安徽理工大学土木工程系,淮南232001 [2]长安大学地质工程研究所,西安710054

出　　处：《工程地质学报》2006年第3期356-359,共4页Journal of Engineering Geology

基　　金：安徽理工大学博士基金资助

摘　　要：常规三轴的CU剪切试验表明,非饱和马兰黄土的应力应变关系呈现出弱软化的特征。从工程应用角度出发,本文给出了一个含有两参数的指数型模型,对比分析表明该模型不仅能很好地描述轴向应变小于15%时的应力应变关系,而且具有模型参数少、容易确定和物理意义明确的优点。进一步研究表明该模型参数均随着非饱和黄土的含水量和围压而呈指数形式变化。Routine tri - axial CU shear test results indicate the stress - strain relationships of the unsaturated Ma-Lan loess are softening with increasing strain. For practice, an exponential constitutive model with two parameters is derived in this paper. This model can not only describe the stress strain relationship well when the axial strain is less than 15%, but also clearly represent physical behavior by using few parameters that can be easily determined. The results also show that parameters change exponentially with the moisture content and confining pressure.

关 键 词：非饱和黄土 应力应变关系 模型 参数 

分 类 号：P642.131[天文地球—工程地质学]