有限元-无网格伽辽金耦合方法模拟沥青路面裂纹扩展  

Modelling of Crack Propagation in Asphalt Pavements by the Coupled EFG and FE Method

作　　者：罗辉[1] 朱宏平[1] 陈传尧[1] 

机构地区：[1]华中科技大学土木工程与力学学院

出　　处：《公路交通科技》2008年第9期1-6,共6页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金资助项目(10672063);武汉市建设科研计划资助项目(2006-39)

摘　　要：基于断裂力学理论,利用无单元伽辽金-有限元耦合方法分析了沥青路面的开裂问题,研究了水平荷载、结构参数等因素的影响。结果显示,水平荷载对沥青路面Top-Down裂纹(TDC)的扩展不利,它使得裂纹尖端的应力强度因子增大,裂纹扩展路径缩短,疲劳寿命减小;交通荷载作用下,沥青面层越薄,越容易产生开裂;Ⅰ、Ⅱ型应力强度因子随着沥青面层模量、基层模量的增加而近似线性增加,裂纹的起裂角随着面层模量的增加而减小,随着基层模量的增加而增大;随着土基弹性模量的增加,Ⅰ型应力强度因子线性减小,裂纹扩展角增大。The mechanics of crack propagation in asphalt pavements is significant to the design and maintenance. The fracture of asphalt pavement was analyzed based on fracture mechanics by using the coupled element free Galerkin （EFG） and finite element （FE） method, and the influences of the horizontal load and the pavement structure parameters were studied. The results show that （1） horizontal load is disadvantageous to the top-down crack （TDC） in asphalt pavements, it increases the stress intensity factor （SIF） of the crack tip and shorten the crack path, thus the fatigue life of the asphalt pavement is minished; （2） the thirmer asphalt overlay is, the more easily top-down crack occurs under wheel loads; （3） with the increase of overlay or base modulus, the SIFs of mode Ⅰ and mode Ⅱ ascend; （4） the crack angle descends with the increase of the overlay modulus, while it ascends with the increase of base modulus; （5） with the increase of the subgrade elastic modulus, the SIF of mode Ⅰ linearly descends, while crack angle ascends.

关 键 词：道路工程 沥青路面 无单元伽辽金-有限元耦合方法 裂纹扩展 应力强度因子 

分 类 号：U416.217[交通运输工程—道路与铁道工程]