黄土粘弹性性质的室内外试验分析  

Analysis on Loess Viscoelasticity by Laboratory and Field Tests

作　　者：蒋甫[1] 应荣华[2] 

机构地区：[1]同济大学道路与交通工程教育部重点实验室,上海200092 [2]长沙理工大学公路工程学院,长沙410076

出　　处：《地下空间与工程学报》2008年第2期269-273,319,共6页Chinese Journal of Underground Space and Engineering

基　　金：交通部西部交通建设科技资助项目“新老路基结合部处治技术”(200131882260)

摘　　要：基于粘弹性力学理论,室内外试验分析不同静力荷载作用下黄土的粘弹性特征,结合三参量单元的蠕变模型和黄土试验装置推导出适合于黄土变形的蠕变方程式。通过自制室内试验设备,测试黄土试件在10kg-100kg十个不同等级静力荷载作用下的应变,采用数据分析软件并结合蠕变方程式对沉降曲线进行模拟,得到不同荷载作用下黄土蠕变方程式的两个关键系数,通过这些系数可以分析黄土的非线性粘弹性性质并可预测不同填筑高度下黄土路基工后不同时间的沉降量。黄土在静力荷载作用下的蠕变表明:其应力应变特征具有粘弹性性质,采用表征非线性粘弹性特征的三参量固体模型能够较好地模拟黄土的沉降规律。Based on viscoelasticity theory, the viscoelastic characteristics of loess under different static pressure levels have been studied by tests. The creep model of three - parameter unit and loess testing equipment are applied to deduce creep deformation formula adaptable to loess. During the laboratory experiments 10kg - 100kg static pressure is imposed on loess and testing data are collected ; then the sedimentation curves are simulated with data analysis software and creep formula. Two key factors of loess creep equation under different loading levels are obtanied. With the creep formula the nonlinear viscoelastic characteristics of loess are analyzed to predict its sedimentation with any filling loess subgrade height and at any time. The loess creep under static pressure shows that its stress - strain has the nature of viscoelastic characteristics and the three-parameter unit model figuring nonlinear viscoelastic characteristics can be used to simulate the loess sedimentation laws better.

关 键 词：道路工程 黄土 粘弹性 蠕变 沉降观测 

分 类 号：U416[交通运输工程—道路与铁道工程]