长沙理工大学学报（自然科学版）2025，Vol.22Issue(2)：36-50,15.DOI:10.19951/j.cnki.1672-9331.20231229003
连续配筋砼复合式路面TD开裂模拟与机理研究
Simulation and mechanism research of TD cracking in continuously reinforced concrete composite asphalt pavements
摘要
Abstract
[Purposes]This study aims to investigate the cracking mechanism of top-down(TD)cracks in the asphalt concrete(AC)layer of continuously reinforced concrete composite asphalt pavements(CRC+AC).[Methods]TD cracking failure tests on composite specimens were conducted using a three-dimensional uniformly distributed load test apparatus.The study involved analyzing the TD cracking characteristics of the AC layer in the specimens.Data on AC layer cracking and deformation were collected using ImageJ software.Additionally,a finite element model of the composite specimen under three-dimensional uniformly distributed load,based on the dual modulus theory,was established and validated through indoor experiments.The mechanical characteristics of the AC layer and the TD cracking mechanism were analyzed.The reliability of the experiment and finite element analysis results was confirmed by combining the results of RIOHTRACK road and field investigation on TD cracking.[Findings]The results of the TD cracking tests revealed transverse TD cracking occurring at both ends of the wheel path under longitudinal horizontal load.This corresponds to sections with steep longitudinal slopes,where large longitudinal horizontal forces cause interlayer and tensile failure of the AC layer,resulting in transverse"U"-shaped shifting TD cracking.The substantial transverse deformation of the specimen led to transverse cracking on the outer side of the wheel path,although such deformation and cracking are not commonly observed on actual road surfaces due to constraints.The longitudinal TD cracking on both sides of the specimen corresponds to transverse tensile and shear stresses at the outer side of the wheel path and the wheel gap.Simulation results indicate that TD cracking may initiate at the ends and sides of the wheel path,and when it reaches approximately 2.4 cm from the surface,it may accelerate expansion.Mesh cracking may also occur at the center of the wheel gap.The analysis of the causes of longitudinal and transverse TD cracking in the investigation confirms the reliability of the experimental and simulation results.[Conclusions]The three-dimensional uniformly distributed load apparatus effectively reflects the interaction between real wheel loads and the pavement.In CRC+AC composite pavement,tensile and shear stresses play a dominant role in TD cracking.TD cracking may initiate from the ends and sides of the wheel path,and TD cracking between wheel gaps may develop into mesh cracking.When longitudinal horizontal load is significant,transverse"U"-shaped shifting TD cracking may occur at both ends of the wheel path.关键词
连续配筋混凝土复合式沥青路面/top-down开裂/三向均布荷载/开裂破坏试验/有限元模拟/图像处理分析Key words
continuously reinforced concrete composite asphalt pavement/top-down cracking/three-directional uniformly distributed load/cracking failure test/finite element simulation/image processing analysis分类
交通运输引用本文复制引用
王渺,孙兴,孙煜,李盛,张豪..连续配筋砼复合式路面TD开裂模拟与机理研究[J].长沙理工大学学报（自然科学版）,2025,22(2):36-50,15.基金项目
国家重点研发计划项目(2021YFB2601000) （2021YFB2601000）
国家自然科学基金资助项目(52378436) （52378436）
湖南省交通运输厅科技进步与创新计划项目(202235) （202235）
湖南省自然科学基金资助项目(2022JJ30598) （2022JJ30598）
长沙理工大学研究生科研创新项目(CXCLY2022020) Project(2021YFB2601000)supported by the National Key R&D Program of China （CXCLY2022020）
Project(52378436)supported by the National Natural Science Foundation of China （52378436）
Project(202235)supported by the Science and Technology Progress and Innovation Plan of Department of Transportation of Hunan Province （202235）
Project(2022JJ30598)supported by the Natural Science Foundation of Hunan Province （2022JJ30598）
Project(CXCLY2022020)supported by the Postgraduate Scientific Research Innovation Project of Changsha University of Science&Technology （CXCLY2022020）
