西藏沥青路面裂缝温度疲劳扩展寿命分析  

Analysis for fatigue life of asphalt pavement temperature crack in Tibet

作　　者：巴桑顿珠[1] 黄晓明[1] 

机构地区：[1]东南大学交通学院,南京210096

出　　处：《东南大学学报（自然科学版）》2006年第6期1013-1017,共5页Journal of Southeast University：Natural Science Edition

基　　金：江苏省交通科学研究计划资助项目(OY042)

摘　　要：为了研究温度收缩对沥青路面开裂的影响规律,在考虑沥青混凝土弹性模量及温缩系数随温度改变的变化规律的基础上,采用断裂力学有限元模型对温度型表面裂缝及反射裂缝的扩展进行动态分析,并预估2种温度裂缝疲劳断裂寿命.结果表明:不同变温条件下,裂缝扩展的应力强度因子K呈现出不同的增长趋势,温降越大,裂缝扩展越快;基准温度越低,裂缝扩展越快.其中表面裂缝温度疲劳扩展寿命要远远小于反射裂缝的温度疲劳扩展寿命,路面结构参数对反射裂缝温度疲劳扩展的影响则要明显高于对表面裂缝温度疲劳扩展的影响.To study the effect of temperature shrinkage on asphalt pavement＇s crack, the temperature propagation of surface crack and reflective crack is analyzed by fracture mechanics and finite element model based on the change of modulus and temperature shrinkage coefficient of asphalt concrete due to temperature variation. The fatigue life of two kinds of temperature crack are estimated. The conclusion indicates, under different temperature variation, the stress intensity factor （SIF） of crack increases with different trend. The more the temperature drops, the faster the crack propagates and the lower the benchmark temperature is, the faster the crack propagates. The temperature fatigue life of surface crack is much less than that of reflective crack and the road structure parameters have more remarkable impact on temperature propagation of reflective crack than on that of surface crack.

关 键 词：表面裂缝 反射裂缝 温度疲劳 有限元模型 

分 类 号：U416.2[交通运输工程—道路与铁道工程]