基于加速加载试验的沥青混合料刚度衰变规律研究  

Study on Stiffness Decay Regularity of Asphalt Mixture Based on Accelerated Loading Test

作　　者：吕松涛[1] 陈杰 

机构地区：[1]长沙理工大学交通运输工程学院,湖南长沙410114 [2]广西道路结构与材料重点实验室,广西南宁530007 [3]广西交通科学研究院,广西南宁530007

出　　处：《公路交通科技》2016年第5期1-6,13,共7页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(51578081;51208066);河南省交通运输科技计划项目(2013K28);湖南省优秀博士论文基金项目(YB2012B031);湖南省研究生科研创新项目(CX2014B376);广西道路结构与材料重点实验室开放基金项目(2014gxjgclkf-002)

摘　　要：为了较真实地揭示沥青混合料的刚度衰变规律,首先通过加速加载试验系统MMLS1/3对成型的沥青混合料标准试件进行了加速加载试验,然后利用材料试验系统MTS测试了不同加速加载次数下沥青混合料的回弹模量。进而提出了基于模量衰变的疲劳损伤变量,据此建立了基于加速加载试验的沥青混合料的刚度衰减模型与非线性疲劳损伤演化模型,并获得了相应的模型参数。由于试件周边的约束作用,加速加载试验条件下的刚度衰变规律与其他常见疲劳加载方式下的衰变规律在第三阶段略有不同,衰变速率呈现先增大后减小的现象。In order to truthfully reveal the stiffness decay regularity of asphalt mixture,first,the accelerated loading test is conducted on the formed standard asphalt mixture specimens by accelerated loading test system MMLS1 /3,and the moduli of resilience of the asphalt mixture under different loading times are tested by materials testing system. Then,the fatigue damage variable based on modulus decay is proposed,the stiffness decay model and the nonlinear fatigue damage evolution model of asphalt mixture based on accelerated loading test are established accordingly,and the relative model parameters are obtained. Because of the effect of surrounding constraints on the specimens,the stiffness decay regularity under the condition of accelerated loading test is different from that of the common fatigue loading methods in the third stage during fatigue failure process,the decay rate increases at first,and then decreases.

关 键 词：道路工程 沥青混合料 加速加载试验 刚度衰变规律 损伤力学 

分 类 号：U416.217[交通运输工程—道路与铁道工程]