内置传感器的沥青混合料变形协调及损伤行为研究  

Study on synergistic deformation and damage behavior of asphalt mixture with built-in sensors

作　　者：李文博 刘朝晖[1] 柳力[1] 赵华 张允宝 王观次 LI Wenbo;LIU Zhaohui;LIU Li;ZHAO Hua;ZHANG Yunbao;WANG Guanci(School of Traffic&Transportation Engineering,Changsha University of Science&Technology,Changsha 410114,China;Transportation Construction Cost Management Station,Department of Transportation of Hunan Province,Changsha 410029,China;Yueyang Road and Bridge Group Co.,Ltd.,Yueyang 414100,China)

机构地区：[1]长沙理工大学交通运输工程学院,湖南长沙410114 [2]湖南省交通运输厅交通建设造价管理站,湖南长沙410029 [3]岳阳路桥集团有限公司,湖南岳阳414100

出　　处：《铁道科学与工程学报》2024年第6期2272-2283,共12页Journal of Railway Science and Engineering

基　　金：国家重点研发计划(2021YFB2601000);湖南省交通运输厅科技进步与创新计划项目(202105);湖南省自然科学基金资助项目(2020JJ5578)

摘　　要：为揭示应变传感器与沥青混合料协同工作性能的演化规律,提高传感器实测数据的应用价值和环境适应性,基于数字图像关联技术和小梁直接拉伸试验,对内置传感器的沥青混合料试件开展多重受力模式下的应变响应研究,分析不同温度条件下传感器与沥青混合料的变形协调性能;并利用四点弯曲试验下的声发射信号和数字图像特征,揭示内置传感器的沥青混合料结构损伤演化规律。研究结果表明:内置应变传感器的沥青混合料变形协调特性与荷载类型、大小及响应时间紧密相关,传感器应变响应具有强烈的温度敏感性,在30~50℃的环境中,传感器应变响应的精准度会急剧衰减,其测量平均绝对误差Eˉa和相对误差Eˉr可分别增大3.49~11.79倍和2.01~2.91倍。利用声发射能量信号准确地刻画了传感器与沥青混合料协同受力下的4阶段损伤演化特征,反映出温度作用会改变结构损伤形式向非稳定开裂的态势发展;不同温度下声发射RA和AF的分布特征表明,内置应变传感器的沥青混合料结构破裂模式受温度影响显著,呈现为拉-剪混合、剪切破裂为主的破裂机制,且随温度不断增大,剪切破裂持续增强,剪切事件由55.7%增长至84.4%,增幅达1.52倍。研究成果对实现内置应变传感器与沥青路面协同工作性能的合理评判,推进传感器技术深度赋能传统沥青路面结构提供参考。This paper aimed to reveal the evolutionary patterns of the collaborative performance between strain sensor and asphalt mixture,and to enhance the practical value and environmental adaptability of the measured data from the sensors.Based on the digital image correlation(DIC)technology and direct tensile beam tests,the strain response of the asphalt mixture specimens with built-in sensors was investigated under multiple stress modes.The deformation coordination performance between the sensors and the asphalt mixtures was analyzed under different temperature conditions.By utilizing the acoustic emission signals and digital image features obtained from four-point bending tests,the structural damage evolution of asphalt mixtures with built-in sensors was revealed.The results indicate that the deformation coordination characteristics of asphalt mixtures with built-in strain sensors are closely related to the type,magnitude,and response time of the load,and the strain response of the sensors exhibits strong temperature sensitivity.In an environment between 30℃and 50℃,the accuracy of the strain response of the sensors deteriorates significantly,with the average absolute error(Eˉa)and relative error(Eˉr)increasing by 3.49~11.79 times and 2.01~2.91 times,respectively.The acoustic emission energy signals accurately characterize the four-stage damage evolution characteristics of the collaborative force between the sensors and the asphalt mixtures,reflecting that temperature affects the structural damage pattern and tends to develop towards non-stable cracking.The distribution characteristics of the acoustic emission rise angle and average frequency at different temperatures indicate that fracture mode of asphalt mixtures with built-in strain sensors is significantly influenced by temperature,showing a predominant mode of tension-shear mixture and shear rupture.Moreover,as the temperature increases,the shear rupture becomes stronger,and the occurrence of shear events increases from 55.7%to 84.4%,with an increase factor

关 键 词：沥青路面 数字图像关联技术 声发射特征 应变传感器 变形协调 

分 类 号：U416.223[交通运输工程—道路与铁道工程]