路基压实土流变变形的力学表征及参数辨识  

MECHANICAL CHARACTERIZATION AND PARAMETER IDENTIFICATION OF RHEOLOGICAL DEFORMATION OF SUBGRADE COMPACTED SOIL

作　　者：王智超[1,2] 罗迎社[3] 罗文波[1,2] 邓旭华[2] 

机构地区：[1]湘潭大学流变力学研究所,湖南湘潭411105 [2]湘潭大学土木工程与力学学院,湖南湘潭411105 [3]中南林业科技大学流变力学与材料工程研究所,湖南长沙410004

出　　处：《岩石力学与工程学报》2011年第1期208-216,共9页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(10772156);教育部新世纪优秀人才支持计划资助项目(NCET–08–0685)

摘　　要：为了研究路基压实土的流变性质,利用改造的实验装置对3种路基压实土分别进行传统直剪、固结实验以及固结蠕变和剪切固结耦合蠕变实验,得到其基本力学性质和蠕变实验数据。借助这些实验数据,基于分数阶微积分理论和Mittag-Leffler函数建立压实土的三参数类Maxwell流变本构模型,通过引入Deborah数、采用含权值的面积判定函数以及逐点搜索的方式,实现该本构模型参数的自动辨识。结果表明建立的流变本构模型具有参数少、且能较好地吻合流变实验数据的优点,具有很好的应用价值。To study the rheological properties of subgrade compacted soil,three kinds of subgrade compacted soil？s traditional direct-shear and consolidation experiments as well as consolidation creep and shear-consolidation coupled creep experiments were carried out respectively by using improving experimental devices.Their basic mechanical properties and creep experimental data were obtained.Using these experimental data,similar Maxwell rheological constitutive model of subgrade compacted soil was set up with three parameters,which was based on fractional calculus theory and Mittag-Leffler function;and its parameter was realized to automatic identification by introducing Deborah number,adopting area determinant function with weight and the manner of point-by-point searching.The results show that the established rheological constitutive model with a few of parameters fits the experimental data with accuracy;so it has a good application value.

关 键 词：土力学 路基压实土 流变本构模型 分数阶微积分 Mittag-Leffler函数 Deborah数 参数辨识 

分 类 号：TU43[建筑科学—岩土工程]