交通荷载作用下公路路基动力特性的数值模拟研究  

Numerical Simulation of Dynamic Performance of Highway Subgrade under Traffic Loads

作　　者：陈剑[1] 苏跃宏[2] 

机构地区：[1]哈尔滨工业大学交通科学与工程学院,黑龙江哈尔滨150090 [2]内蒙古工业大学土木工程学院,内蒙古呼和浩特010051

出　　处：《公路交通科技》2011年第5期44-48,共5页Journal of Highway and Transportation Research and Development

摘　　要：根据交通荷载的特性,应用ABAQUS有限元软件进行数值模拟,将交通荷载作用下的公路路基简化为三维立体模型,采用拟静力法来分析动态的数值问题,分别以静荷载、移动恒定荷载和正弦荷载的形式模拟交通荷载。从现有的弹塑性土体本构关系入手,建立路基土有限元模型,通过模型参数的确定,对路基土在交通荷载作用下的动力响应进行数值分析和计算,从而得到了路基土在交通荷载作用下的动力特性。结果表明,荷载沿道路平面方形的影响范围为8~10 m,沿路基深度方向为6~8 m。移动荷载作用下,道路结构的动力响应较静荷载的有所增加,塑性应变增幅显著;正弦荷载作用下,道路结构的动力响应与移动荷载的相比变化不大,且车速对结构的响应影响不大。According to the traffic load characteristics,the numerical simulation was carried out using the finite element software ABAQUS to simplify the subgrade under traffic load to a 3D model.The dynamic parameters of traffic load,s including static load,moving constant load and sinusoidal load,were simulated and analyzed by adopting pseudo static method.By using the existing constitutive relation of elasto-plastic soil,the finite element model of subgrade soil was established.By determining the parameters of mode,the numerical analysis and computation of the dynamic response of the subgrade soil under traffic load were carried out,thus the dynamic performance of the subgrade soil under traffic load was obtained.The results show that（1） the effect of loading on the road surface ranges from square of 8 m×8 m to 10 m×10 m,and the effect along the direction of the subgrade ranges from depth of 6 m to 8 m;（2） under moving load,dynamic response of pavement structure is larger than the response under static load,and the plastic strain increases significantly;（3） under sinusoidal load,the dynamic response of pavement structure changes little compared to that under moving load,and the effect of vehicle speed on the response of the structure is small.

关 键 词：道路工程 公路路基 数值模拟 动力特性 交通荷载 

分 类 号：U416.1[交通运输工程—道路与铁道工程]