老路基抬高的公路拓宽工程变形特性数值分析  

Numerical Analysis of Deformation Behavior of Highway Widening Engineering with New Fill on Old Subgrade

作　　者：杨涛[1] 阮一舟[1] 张文彦[1] 李国维[2] 

机构地区：[1]上海理工大学环境与建筑学院,上海200093 [2]河海大学道路与铁道工程研究所,江苏南京210098

出　　处：《公路交通科技》2013年第7期35-39,共5页Journal of Highway and Transportation Research and Development

基　　金：广东省交通科技资助项目(201102021)

摘　　要：基于弹塑性有限元方法,对老路基抬高加宽这一新的拓宽方式下公路拓宽工程的变形特性进行了数值模拟分析。分析结果表明,与老路基不抬高直接加宽路基相比,老路基抬高加宽路基的路表沉降、路表水平位移和地基土侧向位移都要大得多。老路基顶面以上的路表沉降分布更为均匀;新路肩和老路中心处地基土固结速率间的差异较小。随着老路基抬高高度的增加,路表工后沉降从老路中心处最小变为新路肩处最小,工后出现负坡率。The elastic-plastic finite element method is adopted to numerical simulate of highway widening engineering with new fill on old subgrade. It is found that the deformation behavior compared with widened subgrade with traditional widening modes, （ 1 ） the settlement, the horizontal displacement on road surface and the lateral displacement in foundation soil of subgrade widened with new fill are significantly larger; （2） the settlement distribution on the surface of widened subgrade becomes uniform; （3） the difference in consolidation rate of foundation soil at the center and new shoulder of widened subgrade becomes small. With the increasing thickness of new fill, the location in which the smallest post-construction settlement on the surface of the widened subgrade moves to the new shoulder from the center of old subgrade, resulting in negative slope ratio.

关 键 词：道路工程 公路拓宽 老路基抬高 变形特性 固结速率 有限元 

分 类 号：U416.1[交通运输工程—道路与铁道工程]