基于Hardin骨架曲线的粗粒土非线性动本构模型  

Study of nonlinear dynamic constitutive model of coarse grained soils based on Hardin-Drnevich skeleton curve

作　　者：李扬波[1] 张家生[1,2] 朱志辉[1,2] 王晅[1,2] 陈文胜[3] LI Yangbo;ZHANG Jiasheng;ZHU Zhihui;WANG Xuan;CHEN Wensheng(School of Civil Engineering and Architecture,Changsha 410075,P.R.China;National Engineering Laboratory for High Speed Railway Construction,Central South University,Changsha 410075,P.R.China;Changsha University of Scienceand Technology,Changsha 410114,P.R.China)

机构地区：[1]中南大学土木工程学院,长沙410075 [2]中南大学高速铁路建造技术国家工程实验室,长沙410075 [3]长沙理工大学土木工程学院,长沙410114

出　　处：《重庆大学学报（自然科学版）》2018年第11期19-30,共12页Journal of Chongqing University

基　　金：国家自然科学基金资助项目(51678576;51378514;51778067)~~

摘　　要：为研究高速铁路路基粗粒土填料在列车荷载作用下的动力特性,使用大型动三轴实验仪对粗粒土填料开展了动力变形特性试验研究。以Hardin-Drnevich骨架曲线为基础,采用Masing准则构造了粗粒土加载、卸载的动应力动应变关系滞回曲线;推导了粗粒土的Hardin-Drnevich骨架曲线和加载、卸载滞回曲线上增量剪切模量表达式。利用ABAQUS软件的UMAT子程序编制了基于Hardin-Drnevich骨架曲线和广义Masing准则的粗粒土非线性动本构模型子程序。通过与三轴试验结果比较,验证所建立粗粒土非线性动本构模型的正确性。将该本构模型应用到高速铁路路基动力响应分析中,模拟结果与模型试验数据吻合较好。相对于摩尔库伦本构模型,该本构模型能够更好地反映铁路路基动力响应特性。In order to study the dynamic deformation characteristics of subgrade filler of coarse grained soils for high speed railway,the consolidated undrained triaxial tests were carried out by large-scale triaxial test system.Firstly,based on Hardin-Drnevich skeleton curve,the dynamic shear stress-strain curves for loading and unloading were constituted by Masing rules,and the equations of incremental tangent shear modulus of the skeleton curve and hysteresis curves were derived.Using the secondary development platform of ABAQUS,the nonlinear dynamic model subprogram based on Hardin-Drnevich skeleton curve and Masing rules of coarse grained soil was compiled.Study results show the nonlinear dynamic model fit triaxial test results well as the program code was applied to dynamic response analysis of high speed railway.Compared to Mohr-Coulumb constitutive model,the nonlinear dynamic constitutive model can reflect dynamic response characteristics of railway subgrades better.

关 键 词：高速铁路 粗粒土 非线性动本构模型 动剪切模量 应力应变滞回曲线 

分 类 号：TU44[建筑科学—岩土工程]