基于饱和度的湿陷性黄土邓肯-张模型参数变化规律研究

VARIATION REGULARITY OF DUNCAN-CHANG MODEL PARAMETERS USING SATURATION OF COLLAPSING LOESS

目前,对于黄土邓肯-张本构模型参数与饱和度的相关研究还不够深入,在工程中还没有被广泛应用。针对晋南湿陷性黄土进行固结排水三轴剪切试验,主要研究土体饱和度对邓肯-张模型参数的影响规律。试验结果表明:随着围压的增大,应力-应变曲线由弱硬化型转化为强硬化型,土体体变增大;模型参数C、φ、K、G、F、D、Rf均随饱和度的增大而减小,参数n随饱和度的增大而增大,且曲线拟合情况均较好。

At present,there is limited study on the relationship between Duncan-Chang constitutive model parameters and the saturation of collapsing loess. This paper uses the consolidated drained triaxial shear test on Jinnan collapsing loess. It studies the law of saturation for the Duncan-Chang model parameters. The results show that when the confining pressure increases,the stress-strain curves change from the weak hardening into strength hardening,and the volume changes also increase. The model parameters of C、φ、K、G、F、D、Rfcan decrease as the saturation increases. But the model parameter n can increase as the saturation increases. The curve fitting is good.