基于双模量理论的连续配筋混凝土复合式路面沥青层表损伤分析及Top-Down开裂控制  

Top-down fatigue crack control and damage analysis of continuous reinforced cement concrete composite asphalt pavement base on bi-modulus theory

作　　者：李盛[1] 孙煜 余时清 王渺 Li Sheng;Sun Yu;Yu ShiQing;Wang Miao(Key Laboratory of Special Enwironment Road Engineering of Hunan Province,Changsha University of Science&Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学特殊环境道路工程湖南省重点实验室,湖南长沙410114

出　　处：《土木工程学报》2024年第4期111-128,共18页China Civil Engineering Journal

基　　金：国家重点研发计划项目(2021YFB2601000);国家自然科学基金(51878076);湖南省自然科学基金项目(2022JJ30598)。

摘　　要：基于连续介质损伤力学和双模量理论,建立单一模量和双模量2种疲劳损伤本构,采用数值模拟的方法,对2种疲劳损伤本构模型进行了简单分析对比,并采用双模量损伤本构分析沥青层(AC)厚度、模量、拉压模量比以及AC层与连续配筋水泥混凝土层(CRC)摩擦系数4个因素对沥青层表面损伤的影响,在单因素分析的基础上通过响应面法对CRC+AC复合式路面抗Top-Down开裂性能进行优化设计。研究表明:AC层在单模量下的最大压应力比双模量下大0.1MPa,但AC层在单模量下几乎未产生拉应力,而双模量下的最大拉应力为0.08MPa;单因素分析得到AC层厚度、模量、拉压模量比、层间摩擦系数推荐最大取值分别为8cm、1700MPa、0.8、7;3个参数中,对AC层表面疲劳损伤度综合影响从大到小的组合为:AC层厚度和拉压模量比,AC层拉模量和拉压模量比,AC层厚度和拉模量;针对不同拉模量的AC层材料提出了不同AC层厚度下的拉压模量比控制标准。Based on the continuum damage mechanics and the bi-modulus theory,two kinds of fatigue damage constitutive models,single modulus,and bi-modulus,were established and compared using numerical simulations.The bi-modulus damage constitutive model was used to analyze the effects of asphalt layer(AC)thickness,AC modulus,AC tension-to-compression modulus ratio,and friction coefficient between AC and continuous reinforced concrete layer(CRC)on the surface damage of the AC layer.Using damage degree as an index,the top-down crack resistance of CRC+AC composite pavement was optimized via response surface methodology on the basis of single-factor analysis.The research results show that under a single modulus,the maximum compressive stress in the AC layer is 0.1MPa higher than that observed under a bi-modulus.However,the AC layer almost doesn't generate any tensile stress under a single modulus,whereas a bi-modulus leads to a maximum tensile stress of 0.08MPa.The recommended maximum values of AC layer thickness,AC layer modulus,AC layer tension-to-compression modulus ratio,and friction coefficient of AC and CRC are determined as 8cm,1700MPa,0.8,and 7,respectively.Among these parameters,the combined effects on AC layer surface fatigue damage,from largest to smallest,were AC layer thickness and AC layer tension-to-compression modulus ratio,AC modulus and AC layer tension-to-compression modulus ratio,and AC layer thickness and AC modulus.Additionally,control criteria for the tensile modulus ratio were proposed for AC materials with different tensile modulus and AC layer thickness.

关 键 词：复合式路面 数值模拟 疲劳开裂 疲劳损伤 双模量损伤本构 

分 类 号：U416[交通运输工程—道路与铁道工程] U418