基于断裂力学的沥青混凝土抗裂性能与研究方法进展  

Advances in Fracture Mechanics Studies on Fracture Resistance andResearch Methods of Asphalt Concrete

作　　者：宋卫民[1] 吴昊[1] SONG Weimin;WU Hao(School of Civil Engineering,Central South University,Changsha 410075,China)

机构地区：[1]中南大学土木工程学院,长沙410075

出　　处：《材料导报》2023年第16期89-99,共11页Materials Reports

基　　金：国家自然科学基金(52008405,51778638)。

摘　　要：针对断裂力学在沥青混凝土的应用背景以及目前研究的不足,分别从沥青混凝土断裂力学基本理论和沥青断裂性能的研究进展以及沥青混凝土断裂测试方法三个方面总结了相关成果和进展。阐述了线弹性断裂力学、弹塑性断裂力学及疲劳断裂力学在沥青混凝土中的应用条件和评价参数;从材料组成、再生和温拌工艺、路面层间黏结以及细观模拟等方面总结了沥青混凝土抗裂性能的研究现状;列举了目前评价沥青混凝土断裂性能的试验方法;指出了目前研究的不足和以后研究的建议。研究结果表明:沥青混凝土的低温和中温断裂一般分别用线弹性断裂力学和弹塑性断裂力学理论来评价和分析,有必要将线弹性断裂力学和弹塑性断裂力学结合,从而提出一个统一的宽温度域的评价指标;目前针对单调荷载作用下沥青混凝土断裂性能的研究较多,针对循环荷载作用下沥青混凝土断裂行为的研究还较少,有必要通过疲劳试验明确沥青混凝土的裂纹扩展规律;沥青混凝土断裂的细观模拟可以从细观角度揭示裂纹发生和扩展的机理,但破坏模型的选取和细观参数的确定是影响模拟结果准确性的重要因素,需要进一步重视。Based on the application background of fracture mechanics in asphalt concrete and the shortcomings of current research,the relevant achievements and research results are summarized from the basic theory of asphalt concrete fracture mechanics,the research progress of fracture performance and the fracture test method of asphalt concrete.The application conditions and evaluation parameters of linear elastic fracture mechanics,elastic-plastic fracture mechanics and fatigue fracture mechanics in asphalt concrete are expounded.The research status of asphalt concrete fracture resistance is summarized from the aspects of composition,recycling and warm mix technology,interlayer bonding and mesoscopic simulation.The current test methods for evaluating the fracture performance of asphalt concrete are highlighted.Insufficiency of current research and suggestions for future research are pointed out.The research results show that the low-temperature and medium-temperature fractures of asphalt concrete are generally evaluated and analyzed by linear elastic fracture mechanics and elastoplastic fracture mechanics,respectively,and the evaluation indexes of fracture performance at medium and low temperature are different.A unified evaluation index for a wide temperature range is recommended to be proposed.Currently,lots of studies are conducted on fracture performance under monotonic load,few studies on fracture behavior of asphalt concrete under cyclic load are performed.It is necessary to clarify the crack propagation law of asphalt concrete through fatigue test.The mesoscopic simulation of asphalt concrete fracture can reveal the mechanism of crack occurrence and propagation from a mesoscopic perspective,but the selection of the failure model and the determination of mesoscopic parameters are important factors that affect the accuracy of the simulation results,which need further attention.

关 键 词：沥青混凝土 断裂力学 线弹性 弹塑性 疲劳 测试方法 细观模拟 

分 类 号：U416[交通运输工程—道路与铁道工程] TB332[一般工业技术—材料科学与工程]