基于数字图像技术的沥青混合料反射裂纹扩展行为  

Reflection Crack Propagation Behavior of Asphalt Mixture Based on Digital Image Correlation Technology

作　　者：田小革[1] 黄雪梅 李光耀 窦文利 昶慧芹 李慧珍 郭常辉 罗楚钰 TIAN Xiao-ge;HUANG Xue-mei;LI Guang-yao;DOU Wen-li;CHANG Hui-qin;LI Hui-zhen;GUO Chang-hui;LUO Chu-yu(School of Traffic and Transportation Engineering,Changsha University of Science&Technology,Changsha 410114,China;Hebei Province Highway Jingxiong Preparatory Office,Baoding 071700,China;Transportation planning and Design Institute of Chengde Transportation Bureau,Chengde 067000,China;Hebei Expressway Group Co.,Ltd.,Shijiazhuang 050031,China;International College of Engineering,Changsha University of Science&Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学交通运输工程学院,长沙410114 [2]河北省高速公路京雄筹建处,保定071700 [3]承德市交通局交通规划设计院,承德067000 [4]河北高速公路集团有限公司,石家庄050031 [5]长沙理工大学国际工学院,长沙410114

出　　处：《科学技术与工程》2023年第33期14388-14398,共11页Science Technology and Engineering

基　　金：国家自然科学基金(51978086);湖南省研究生科研创新项目(CX20210750);河北省交通运输厅科技项目(JX-202012)。

摘　　要：为了研究不同加载模式下的沥青混合料反射裂纹扩展行为,对复合小梁试件进行复合型和弯拉型破坏荷载试验以及不同应力比状态的疲劳试验,并基于数字图像相关技术(digital image correlation,DIC)观测反射裂纹萌生至扩展全过程,从裂纹宽度、裂纹扩展路径、裂纹扩展高度及疲劳反射裂纹扩展速率深入分析其扩展行为。结果表明:沥青混合料反射裂纹扩展行为经历微裂纹萌生、微裂纹发展阶段、微裂纹向宏观裂缝转变、宏观裂缝快速发展4个阶段。反射裂纹扩展由主裂纹扩展以及次裂纹扩展构成,且次裂纹扩展速率高于主裂纹。采用logistic函数对混合料疲劳反射裂纹扩展量进行拟合是可靠的。研究成果对于完善沥青路面设计及其耐久性评价具有重要意义。To study the reflection crack propagation behavior of asphalt mixture under different loading modes,composite and flexural failure load tests and fatigue tests under different stress ratios were carried out on composite trabecular specimens.The whole process of reflection crack initiation and propagation was observed based on digital image correlation technology(DIC).The crack propagation behavior was analyzed from crack width,crack propagation path,crack propagation height and fatigue reflection crack propagation rate.The results show that the reflected crack propagation behavior of asphalt mixture goes through four stages:microcrack initiation,microcrack development,microcrack transformation to macro crack,and macro crack rapid development.The reflected crack growth consists of primary crack growth and secondary crack growth,and the secondary crack growth rate is higher than that of the primary crack.It is reliable to use logistic function to fit the fatigue reflection crack propagation of the mixture.The research results are of great significance for improving asphalt pavement design and durability evaluation.

关 键 词：数字图像相关技术 沥青混合料 反射裂纹 扩展行为 加载模式 

分 类 号：U416[交通运输工程—道路与铁道工程]