基于反正切函数的西安黄土动本构模型  

DYNAMIC CONSTITUTIVE MODEL OF LOESS BASED ON ARCTANGENT FUNCTION

作　　者：张媛媛[1] 邵珠山[1] 齐晋阳 

机构地区：[1]西安建筑科技大学土木工程学院,西安710055

出　　处：《工程地质学报》2017年第3期630-636,共7页Journal of Engineering Geology

基　　金：陕西省科技统筹创新工程计划项目(2013KTCQ01-16)资助

摘　　要：基于反正切函数曲线,构造了一种新的黄土非线性动力本构模型。选取西安黄土试样进行室内动三轴试验,得到黄土试样的动应力-应变曲线,并以此得到了所提本构模型的理论曲线。理论曲线与试验结果对比表明,较Hardin-Drnevich模型而言,所提西安黄土动本构模型能够更好地描述三轴应力条件下黄土的强度和变形特征。研究结果表明,加载频率与含水率不变时,动剪切模量随围压的增大而增大。加载频率与围压不变时,动剪切模量随含水率的增大而逐渐减小。含水率与围压不变时,动剪切模量随加载频率的增大而增大。A new nonlinear dynamic constitutive model of the loess is presented based on the arc-tangent function.In order to get the loess dynamic stress-strain curve and the theoretical curve of the proposed constitutive model of the loess,dynamic triaxial tests of Xi＇an loess are conducted. Comparison between the theoretical and experimental results indicates that,compared with the H-D model,the new dynamic constitutive mode proposed in this paper is more suitable to describe the strength and deformation characteristics of Xi＇an loess under the triaxial stress condition. The results obtained in this paper show that,with the same loading frequency and moisture content,the dynamic shear modulus of Xi＇an loess increases with decrease of the moisture content. With the same confining pressure and loading frequency,dynamic shear modulus of Xi＇an loess is increasing with increase of the confining pressure. With the same confining pressure and moisture content,dynamic shear modulus of Xi＇an loess increases with the increase of loading frequency.

关 键 词：黄土 动本构模型 反正切函数 动三轴试验 

分 类 号：TU43[建筑科学—岩土工程]