工程地质学报Issue(6)：1102-1108,7.DOI:10.13544/j.cnki.jeg.2014.06.013
考虑含砂量影响的砂-黏混合土应力-应变关系特性研究
STRESS-STRAIN RELATIONSHIPS OF SAND-CLAY MIXTURES WITH DIFFERENT SAND CONTENTS
摘要
Abstract
The sand-clay mixtures are made by mixing sand and marine clay with different dry weight proportions homogeneously.Undrained triaxial tests are conducted to study the effects of sand content variation and confining pressure on the initial shear modulus and stress-strain relationships of the mixtures.Mechanisms are analyzed.Tests results show that there is no obvious relationship between the initial shear modulus and the sand content variation when sand content is less than 50%.For sand-clay mixtures with sand content ranging from 50%to 80%,the initial shear modulus increases linearly with the growing sand content.The sand content parameter should be introduced into the initial shear modulus so that the modified Duncan-Chang model can be used to imitate the stress-strain relationships of the sand-clay mixtures with sand content less than 80%effectively.When the sand percentage is over than 80%,the characteristic of strain softening occurs.The initial shear modulus is kept steady gradually.The peak strain becomes smaller.The softening model is useful to describe the stress-strain relationships of sand-clay mixtures in this case.The confining pressure has a visible effect on the stress-strain relationship of sand-clay mixtures.As the confining pressure increases, the initial shear modulus shows a linear growing trend in double logarithmic coordinate.关键词
砂-黏混合土/初始切线模量/应力-应变关系/邓肯-张模型/软化模型Key words
Sand-clay mixture/Initial shear modulus/Stress-strain relationship/Duncan-Chang model/Softening model分类
天文与地球科学引用本文复制引用
贾卫兵,郭飞,杨爱武..考虑含砂量影响的砂-黏混合土应力-应变关系特性研究[J].工程地质学报,2014,(6):1102-1108,7.基金项目
国家自然科学基金项目（5117918641372291）资助． （）
