考虑土体空间变异性的加筋路堤变形特征分析  

Analysis of deformation characteristics of reinforced embankment considering spatial variability of soil mass

作　　者：郑俊杰[1] 卢嘉泰 刘洋 ZHENG Junjie;LU Jiatai;LIU Yang(Institute of Geotechnical and Underground Engineering,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学岩土与地下工程研究所,湖北武汉430074

出　　处：《华中科技大学学报（自然科学版）》2023年第7期7-12,17,共7页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(52078236,51878313).

摘　　要：基于随机场理论,结合有限元分析方法和蒙特卡罗策略,针对地基土参数的空间变异性对移动荷载作用下土工加筋路堤变形特征的影响进行了深入分析.利用Karhunen-Loeve(KL)展开法实现随机场的离散.采用ABAQUS软件建立土工加筋路堤模型,编制Fortran子程序施加移动荷载,结合Python语言二次开发实现随机场的嵌入.以土体弹性模量的空间变异性为重点,系统研究了地基土弹性模量的变异系数和自相关距离对加筋路堤变形特性的影响,并进行概率统计分析.结果表明:随着变异系数增大,路堤挠度曲线趋于离散,挠度曲线形态变化趋于明显;随着自相关距离的增大,路堤挠度曲线趋于离散,根据自相关距离的不同,路堤有三种变形形态模式;随着地基土弹性模量的变异系数和自相关距离的增大,最大挠度的累计概率分布曲线趋于分散,空间变异性的平均影响作用趋于明显.在加筋路堤的设计中适当地考虑土体的变异性会更加符合实际情况.Based on the random field theory,combined with the finite element analysis method and the Monte Carlo strategy,the influence of the spatial variability of foundation soil parameters on the deformation characteristics of reinforced embankment under moving loads was analyzed in depth.The Karhunen-Loeve(K-L)expansion method was used to discrete the random field.Meanwhile,the reinforced embankment numerical model was established using ABAQUS software,and the moving load was applied by the Fortran subroutine,which is combined with the secondary development of Python language to realize the embedding function.The effects of the coefficient of variation(COV)and the scales of fluctuation(SOF)of the foundation soil elastic modulus on the deformation characteristics of the reinforced embankment were systematically studied,and probabilistic statistical analysis had also been performed.The results indicated that as the COV increases,the deflection curve of the embankment tends to be discrete,and the shape of the deflection curve changes more significantly.As the autocorrelation distance increases,the deflection curve of the embankment tends to become discrete.According to the different autocorrelation distances,the embankment has three deformation modes.With the increase of the COV and SOF of the foundation soil elastic modulus,the cumulative probability distribution curve of the maximum deflection tends to be dispersed and the average effect of spatial variability tends to be more significant.Proper consideration of soil variability in the design of reinforced embankments would be more realistic.

关 键 词：加筋路堤 动力响应 随机场 空间变异性 概率分析 

分 类 号：TU47[建筑科学—结构工程]