基于黏聚区模型的沥青路面反射裂缝数值模拟  

Numerical Simulation of Reflection Cracks in Asphalt Pavements Using Cohesive Zone Modeling

作　　者：唐虎城 朱尚书 欧信旺 TANG Hucheng;ZHU Shangshu;OU Xinwang(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;Highway Engineering Key Laboratory of Sichuan Province,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学土木工程学院,成都610031 [2]西南交通大学道路工程四川省重点实验室,成都610031

出　　处：《交通科技》2024年第3期5-10,共6页Transportation Science & Technology

基　　金：四川省自然科学基金(24NSFSC1369)资助。

摘　　要：为研究半刚性基层沥青路面反射裂缝的扩展规律,结合ABAQUS有限元软件,采用双线性黏聚区模型模拟了半圆弯曲试验断裂过程,将模拟得到的荷载-线位移曲线与试验结果进行对比以验证黏聚区模型在开裂分析中的适用性,其次使用弹簧单元模拟Winker地基,同时将黏聚区模型应用在沥青路面有限元模型中,研究沥青面层反射裂缝扩展规律。结果表明,双线性黏聚区模型在沥青混凝土开裂过程具有良好适用性;在加载过程中半圆弯曲试件经历了弹性、损伤和断裂3个阶段,荷载峰值为试件达到初始损伤点的7.39倍;损伤单元主要集中在轮印正下方,随着加载位移的不断增加,损伤单元向四周扩展,单元逐步失效形成宏观裂缝;路面结构参数中,基层模量、地基反应模量的增加对面层阻止反射裂缝扩展有利,而面层模量的增加则不利于面层阻止反射裂缝扩展。To study the expansion law of reflection cracks in asphalt pavement with semi-rigid base layer,combined with ABAQUS finite element software,the bilinear cohesive zone model was used to simulate the fracture process of semicircular bend test.The load-line displacement curve obtained from the simulation was compared with the test results to verify the applicability of the cohesive zone model in the cracking analysis.Then Winker foundation was simulated by using the spring element,and the cohesive zone model was applied in the finite element model to study the expansion law of reflection cracks in asphalt pavement.The result shows that:the bilinear cohesive zone model has good applicability in the cracking process of asphalt concrete.The semicircular bend specimen experiences elasticity,damage,and fracture three stages during the loading process.The peak load is 7.39 times of the initial damage point of the specimen.The damage elements are mainly concentrated in the lower part of the wheel print,and with the increasing loading displacement,the damage elements expand in all directions,and the elements gradually fail to form macroscopic cracks.Among the structural parameters of the pavement,the increase in the elastic modulus of the base layer and reaction modulus of the foundation is favorable for the surface layer to resist the expansion of reflective cracks,whereas the increase in the elastic modulus of the surface layer is not conducive to the resistance to the expansion of reflective cracks in the surface layer.

关 键 词：道路工程 反射裂缝 半圆弯曲试验 黏聚区模型 数值模拟 

分 类 号：U416.217[交通运输工程—道路与铁道工程]