铁道科学与工程学报2024，Vol.21Issue(6)：2272-2283,12.DOI:10.19713/j.cnki.43-1423/u.T20231339
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
摘要
Abstract
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 of 1.52.The research findings provide valuable insights for the reasonable evaluation of the collaborative performance between built-in strain sensors and asphalt pavements,and contribute to the deep empowerment of sensor technology in traditional asphalt pavement structures.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Key words
asphalt pavement/digital image correlation technology/acoustic emission characteristics/strain sensor/synergistic deformation分类
交通工程引用本文复制引用
李文博,刘朝晖,柳力,赵华,张允宝,王观次..内置传感器的沥青混合料变形协调及损伤行为研究[J].铁道科学与工程学报,2024,21(6):2272-2283,12.基金项目
国家重点研发计划(2021YFB2601000) （2021YFB2601000）
湖南省交通运输厅科技进步与创新计划项目(202105) （202105）
湖南省自然科学基金资助项目(2020JJ5578) （2020JJ5578）
