马兰黄土软化型本构模型研究

Study on Softening Constitutive Model of Malan Loess

通过对不同含水量的马兰黄土的单轴压缩试验、固结不排水剪切试验、固结排水试验,在深入了解马兰黄土本身独特的物理力学性质的基础下,分析了马兰黄土的应力—应变曲线特性及物理意义,提出了马兰黄土的软化本构模型。该模型准确的描述了轴向应变不高于5%~6%的马兰黄土应力-应变关系,揭示了马兰黄土在低应变的条件下的受力机理,也为进一步研究马兰黄土的其他各种力学机理提供了理论基础。同时对所得到本构模型的各参数的变化规律进行了分析,分析结果表明参数a和b都是含水量和围压的函数,并且两者都呈一定的变化规律。

In this paper,based on the uniaxial compression tests,consolidated undrained shear tests,consolidation drainage shear tests of Malan loess with different water contents,and based on understanding deeply of peculiar physico-mechanical property of Malan loess,the properties and physical meanings of stress-strain curves of Malan loess were analyzed,and softening constitutive model of Malan loess was proposed.The model can be used to describe accurately stress-strain of Malan loess which axial strain was lower ...