交通荷载下层状道路系统动应力特征分析  

STUDIES ON DYNAMIC STRESS CHARACTERS OF LAYERED ROAD SYSTEM UNDER TRAFFIC LOADING

作　　者：汤连生[1] 徐通[1] 林沛元[1] 于海涛[1] 

机构地区：[1]中山大学地球科学系,广东广州510275

出　　处：《岩石力学与工程学报》2009年第A02期3876-3884,共9页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(40872205);全国高等学校博士学科专项科研基金资助项目(20070558032);广东省自然科学基金资助项目(07003738);广东省科技计划资助项目(2008B030303009)

摘　　要：通过原位监测试验的相关数据,总结出层状道路系统在交通荷载下的动应力时空分布规律。在现有弹性层状体系理论基础上,采用传递矩阵方法,结合黏弹性运动方程,推导交通荷载下三维黏弹性层状道路系统的动力响应解答,采用Matlab矩阵分析软件进行数值计算,和原位监测试验的结果进行对比分析。在上述分析的基础上采用快速拉格朗日有限差分程序FLAC3D编制交通荷载下层状道路系统动力响应分析程序,对层状道路系统进行三维数值模拟计算,分析层状道路系统内部动应力和动位移时空分布规律,并将计算结果与现场原位监测试验进行对比分析,证明计算程序的有效性。研究结果表明:(1)浅层动附加应力随深度增加加速衰减,而深层动附加应力的衰减率不大;(2)路面结构能有效扩散动应力;(3)车辆自身振动将使动应力明显增大;(4)动附加应力具有累积效应。The data of field monitoring were used to analyze the affection of various factors.It concludes the dynamic stress distribution discipline in layered road system.Based on the existing elastic multilayer theories,using methods of transfer matrix and viscoelastic equation,the dynamic response of three-dimensional layered road system was obtained.Finally,the result,which was calculated by Matlab matrix numerical analysis software,was compared with the data of field monitoring test.Based on the above analysis,FLAC^3D,the program was compiled for dynamic response of multi-layer road system under traffic loading.This program was used for three-dimensional numerical analysis of multi-layer road system,the distribution discipline of dynamic stress and dynamic displacement has been analyzed.At the end,the result was compared with the data of field monitoring to verify the effect of the program.the results indicate：（1） dynamic additional stress decreases quickly and the rate of attenuation tends to smooth as the depth increased;（2） dynamic additional stress is diffused effectively and significantly by the upper layers;（3） vehicle vibrating causes stronger dynamic additional stress than that without vibration;and（4） dynamic additional stress has accumulative effect.

关 键 词：数值分析 交通荷载 层状道路系统 动力响应 层状体系理论 传递矩阵 非线性动力分析 

分 类 号：O241[理学—计算数学]