高速公路扩建工程软基隔离墙加固机理的数值分析  

Numerical Analysis of Reinforcement Mechanism of Separating Wall for Expressway Widening on Soft Ground

作　　者：杨涛[1] 李磊[1] 石磊 李国维[3] 

机构地区：[1]上海理工大学环境与建筑学院,上海200093 [2]上海市金山区市政工程管理署,上海200540 [3]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》2011年第8期52-56,共5页Journal of Highway and Transportation Research and Development

基　　金：广东省交通重点科技项目(200502)

摘　　要：为把握新路基荷载作用下隔离墙加固直接方式拼接的拓宽路堤工作性状,建立了二维弹塑性有限元模型。通过有限元数值模拟分析,从加固前后拓宽路堤的沉降、地基土水平位移和竖向附加应力的变化等方面揭示了隔离墙的加固机理,并分析了隔离墙的最佳设置位置。计算结果表明,隔离墙的设置可有效地减小地基土水平位移和竖向附加应力,从而减小新老路基的沉降和差异沉降。拓宽路堤最大沉降和横向坡率的变化大小与隔离墙位置有关,隔离墙的最佳位置在新路肩下。For inuestigating the performance of widened embankment with the direct connection method on soft ground improved by separating wall,a 2D elastic-plastic finite element model was established.Numerical analysis was conducted to investigate the reinforcing mechanism of the widened embankment over soft ground with separating wall,including settlement at top of the widened embankment,lateral displacement and additional vertical stress of the soft soil pre and post reinforcement.The optimal position of separating wall was proposed.The results indicate that（1） the lateral displacement and additional vertical stress can be effectively reduced by installation of separating wall,leading to decrease of the settlement and differential settlement between the old and widened embankment;（2） the variation of maximum settlement and transverse gradient of widened embankment depend on the position of separating wall,and the optimal location of separating wall is under the shoulder of new embankment.

关 键 词：道路工程 加固机理 数值分析 隔离墙 拓宽路堤 

分 类 号：U416.1[交通运输工程—道路与铁道工程]