冻融循环与动载耦合作用下低路堤路基沉降数值研究  

Numerical Research on Low Embankment Settlement Subjected to Freeze-Thaw Cycle and Dynamic Vehicle Loading Actions

作　　者：安笑 岳强[1] 徐金涛[1] 

机构地区：[1]山东农业大学水利土木工程学院,泰安市271018 [2]山东泰安市交通运输局,泰安市271000

出　　处：《公路》2015年第11期25-30,共6页Highway

基　　金：国家科技支撑计划项目;项目编号2015BAB07B05;山东省自然科学基金项目;项目编号ZR2013EEM002;山东省交通科技项目;项目编号2013A09-04

摘　　要：为探讨动载与冻融循环耦合作用下低路堤路基的沉降规律,以季冻地区典型低路堤断面为研究对象,利用ADINA有限元数值分析软件,建立了冻融循环和行车动载耦合作用下的路基三维分析模型。根据冻融循环期,将模型划分为6个过程模拟分析了低路堤沉降的竖向、水平位移及最大剪应力随时间和交通量变化的一般规律。研究结果表明:低路堤路面竣工后前6年弯沉增加较快,随着时间的推移,累积沉降逐渐趋于稳定;随着车流量的增加,由行车荷载和冻融引起的累积沉降和剪应力增大速度增快,限制超载是减小累积沉降的关键;隔离层能有效控制路面弯沉、地表水平位移和剪应力;分析模型实现了路基冻土体力学特征值的动态控制,为季冻区的低路堤沉降变形计算提供依据。The typical cross-section of low embankment in seasonally frozen soil region is taken as research object in order to study the settlement of low embankment subjected to freeze-thaw cycle combined with moving vehicle load. A 3D finite element model is established with ADINA finite element numerical analysis software, considering the coupling action of the freeze-thaw cycle and the moving vehicle load. The model is divided into six processes to simulate and analyze the general law of change of vertical and horizontal displacement of low embankment settlement and maximum shear stress with time and traffic volume. The results indicate that pavement deflection of low embankment increases significantly in the first 6 years after completion, afterward cumulative settlement gradually becomes stable over time; cumulative settlement and shear stress increase quickly induced by traffic load and freeze-thaw cycle with the increase of vehicle quantities, so overload limiting is critical to control the cumulative settlement; the isolation layer can effectively control deflection, horizontal displacement and shear stress;dynamic controlling over the mechanical characteristic values of embankment is achieved, which can provide basis for the settlement deformation calculation of low embankment in seasonal frozen region.

关 键 词：道路工程 低路堤 冻融循环 动载 ADINA软件 

分 类 号：U416.1[交通运输工程—道路与铁道工程]