基于松弛特性的沥青路面低温缩裂分析  

Analysis on Shrinkage Cracking in Asphalt Pavement under Low Temperature Based on Relaxation

作　　者：孙雅珍[1] 张敏江[2] 

机构地区：[1]沈阳建筑大学理学院,辽宁沈阳110168 [2]沈阳建筑大学土木工程学院,辽宁沈阳110168

出　　处：《沈阳建筑大学学报（自然科学版）》2010年第4期670-674,共5页Journal of Shenyang Jianzhu University：Natural Science

基　　金：辽宁省自然科学项目(20082009);辽宁省教育厅基金项目(2009B152);住房和城乡建设部项目(2009-K4-21)

摘　　要：目的考虑沥青混凝土的松弛特性,研究含裂缝沥青混凝土路面的低温缩裂,揭示其破坏机理.方法应用断裂力学与损伤力学耦合分析的方法确定初始损伤区与断裂区,采取逐级加密的方法划分网格来模拟裂缝,应用数值模拟的方法分析沥青混凝土的低温松弛特性.结果随距裂尖点距离的逐渐增大,其垂直于裂缝方向的正应力将随之逐渐降低;初始裂缝越深,在相同时间内,垂直于裂缝方向的最大应力和最大弯沉也越大;随路表温度降低幅度的逐渐增大,垂直于裂缝方向的正应力也随之逐渐增大.结论给出了温度、时间和裂缝深度对含裂缝沥青混凝土路面松弛特性的影响,对我国北方道路领域的研究具有借鉴作用.：This paper analyzes shrinkage cracking in asphalt pavement with surface crack at low temperature based on relaxation and reveals the failure mechanism. Applying the coupling analysis of fracture mechanics and damage mechanics, initial damage and fracture zones are obtained. The elements are locally refined in order to simulate crack. Relax properties for AC with surface cracks under low temperature load is simulated. Normal stress is decreased with distance from crack tip increased. When time is same, maximum stress and maximum vertical displacement is increased with initial crack length increased. Normal stress is increased with surface pavement temperature decreased. The effects of temperature and time and initial crack length to relaxation characters of asphalt pavement are conducted. From the results of this paper are directive functions for north pavement field.

关 键 词：松弛 裂缝 低温缩裂 沥青混凝土路面 

分 类 号：U416[交通运输工程—道路与铁道工程]