基于内聚力模型的沥青路面低温缩裂研究  

Study of Low Temperature Cracking of Asphalt Pavement Based on Cohesive Zone Model

作　　者：赵永利[1] 张东[1] 

机构地区：[1]东南大学交通学院,江苏南京210096

出　　处：《公路交通科技》2010年第1期11-16,共6页Journal of Highway and Transportation Research and Development

基　　金：交通部西部交通建设科技项目(2007-318-950-66)

摘　　要：为了深入分析沥青路面低温收缩裂缝的形成和扩展问题,引入了双线性内聚力模型。使用双线性内聚力模型模拟了沥青路面的低温缩裂过程,并且讨论了双线性内聚力模型参数和面层结构参数对低温缩裂的影响。研究表明:随着温度的降低,沥青面层经历了从材料损伤到断裂的过程。在降温幅度较小时,沥青路面虽然没有形成宏观裂缝,但是路表附近的路面材料已经经历了一定程度的损伤;当降温幅度达到一定值时,沥青路面就会发生脆性断裂,形成宏观裂缝。增加断裂能可以减小路面的损伤程度和受损深度,降低路面的断裂温度,从而延缓了路面的断裂。与断裂能相比,提高开裂强度可以更有效地减小路面的损伤程度和受损深度;减小面层的弹性模量和温度收缩系数可以有效地减小面层的损伤程度。A bilinear cohesive zone model was introduced to analyze the initiation and propagation of the low temperature crack of asphalt pavement. The process of the low temperature cracking of asphalt pavement was analyzed using the bilinear cohesive zone model and influence of the cohesion parameters and the surface structural parameters on the low temperature cracking was discussed. The result indicates that （1） the pavement surface experiences a process from material damage to fracture with the drop of temperature ; （2） when the temperature drop is comparatively small, there will be no macro-cracks in pavement, but the material near to surface will be damaged to a certain extent; （3） when the temperature drop increases to a certain value, the asphalt pavement will experience brittle fracture and appear macro-cracks; （4） increasing the fracture energy will reduce the damage degree, the damage depth and the fracture temperature of the asphalt pavement so as to delay the fracture of the pavement; compared coefficient （5） increasing the cohesive strength can effectively with increasing the fracture energy; （6） i^tucing the of the surface can reduce the extent of damage of the reduce the damage degree and the damage depth Young＇ s modulus and the temperature contraction road surface effectively.

关 键 词：道路工程 低温缩裂 双线性内聚力模型 沥青路面 数值模拟 

分 类 号：U416.217[交通运输工程—道路与铁道工程]