Numerical analysis of the effects of subgrade settlement on top-down cracking in epoxy asphalt pavement  

作　　者：JIANG XiuJie HUANG Wei LUO Sang WEI Ya KONG WeiYi DU KaiJun 

机构地区：[1]School of Transportation,Southeast University,Nanjing 211189,China [2]Intelligent Transportation System Research Center,Southeast University,Nanjing 211189,China [3]Department of Civil Engineering,Tsinghua University,Beijing 100084,China [4]Nanjing Modern Multimodal Transportation Laboratory,Nanjing 211135,China

出　　处：《Science China(Technological Sciences)》2024年第10期3308-3320,共13页中国科学（技术科学英文版）

基　　金：supported by the Major Science and Technology Project of Nanjing(Grant No.202209012);the Carbon Peak and Carbon Neutrality Science and Technology Innovation Special Funds of Jiangsu Province(Grant No.BE2022615);2024 Jiangsu Provincial Graduate Student Research and Innovation Program(Grant No.KYCX24_0449).

摘　　要：Epoxy asphalt pavement cracking caused by subgrade settlement is detrimental to the long-term safe service of roads.A threedimensional finite element model of epoxy asphalt pavement is established to investigate the effects of subgrade settlement on the propagation of top-down cracking(TDC).The contour integral method is utilized to calculate the stress intensity factor(SIF)at the crack tip,and then the extended finite element method(XFEM)is used to analyze the propagation behavior of TDC under combined subgrade settlement and traffic loading.The results of these analyses indicate that increased subgrade settlement,stiffer surface layers,and softer bases will increase the SIF,resulting in a faster crack propagation rate.It is suggested that the use of epoxy asphalt materials in pavement structures can allow more subgrade settlement than conventional asphalt mixtures.However,when the base layer modulus is higher than 12500 MPa,the increase in surface modulus can decrease crack propagation length.Sensitivity analysis results demonstrate that subgrade settlement has the most significant impact on TDC propagation.The conclusions of this study are expected to provide a theoretical basis for crack prevention in the design and maintenance of pavement structures.

关 键 词：epoxy asphalt pavement subgrade settlement XFEM stress intensity factor crack propagation 

分 类 号：U418[交通运输工程—道路与铁道工程]