薄层沥青混凝土低温开裂行为分析及数值模拟  

Low Temperature Cracking Analysis and Simulation of Thin-layer Overlay Asphalt Concrete

作　　者：杜延昭 朱尚书 张泽 张洋洋 石红星 田荣水 DU Yan-zhao;ZHU Shang-shu;ZHANG Ze;ZHANG Yang-yang;SHI Hong-xing;TIAN Rong-shui(China Construction Infrastructure Construction Co.,Ltd.,Beijing 100044,China;Highway Engineering Key Laboratory of Sichuan Province,Southwest Jiaotong University,Chengdu 610031,China;Beijing Ztone Technology Co.,Ltd.,Beijing 100071,China)

机构地区：[1]中国建设基础设施有限公司,北京100044 [2]西南交通大学道路工程四川省重点实验室,成都610031 [3]北京智华通科技有限公司,北京100071

出　　处：《科学技术与工程》2025年第8期3444-3451,共8页Science Technology and Engineering

基　　金：国家自然科学基金(51878575);四川省自然科学基金(2024NSFSC0169)。

摘　　要：低温开裂是薄层沥青混凝土常见的病害,为了揭示薄层沥青混合料的低温开裂行为,开展结合裂纹观测和数字图像处理的半圆弯曲试验以及基于细观结构黏聚区模型的有限元数值模拟研究,通过模拟得到的加载力-位移曲线验证了模型的适用性,进一步分析试件内部的应力变化。结果表明:采用数字图像处理技术可很好地显式沥青混合料的低温开裂行为;细观结构有限元模拟适用于分析沥青混合料的开裂行为;跨中截面最大拉应力和中性轴位置与材料的断裂属性有很好的相关性。low-temperature fracture is the normal distress of the thin-layer overlay asphalt mixture.To reveal the low-temperature cracking behavior,semicircular bending tests combined with crack observation,digital image correlation and a finite element numerical simulation based on the meso-structure cohesive zone model were carried out.The applicability of the model was verified by the load-displacement curve and crack paths.The results show that the low-temperature cracking behavior of asphalt mixture can be well demonstrated by digital image processing.The simulation of asphalt mixture meso-structure is suitable for analyzing the cracking behavior.Furthermore,the maximum tensile stress and neutral axis positions on the mid-span section are correlated with the properties of the materials.

关 键 词：薄层沥青混合料 开裂行为 半圆弯曲试验 黏聚区模型 细观结构 

分 类 号：U416.217[交通运输工程—道路与铁道工程]