基于ALF加速加载试验的沥青层疲劳损伤  

Fatigue Damage in Asphalt Layer Based on ALF Accelerated Loading Test

作　　者：陈少幸[1,2] 张肖宁[3] 孟书涛[4] 任伟新[1] 

机构地区：[1]中南大学土木建筑学院,湖南长沙410083 [2]广东交通集团检测中心,广东广州510420 [3]华南理工大学道路工程研究所,广东广州510641 [4]交通运输部公路科学研究院,北京100088

出　　处：《公路交通科技》2012年第1期18-22,共5页Journal of Highway and Transportation Research and Development

基　　金：交通部西部交通建设科技项目(200431800004)

摘　　要：为了得到沥青层疲劳损伤规律,根据北京ALF试验路疲劳性能加速加载试验,利用短周期单元的渐进疲劳损伤模拟模型,按照Miner法则进行先行累积,分析了加速加载过程中沥青层模量和沥青层底应变的变化规律。结果表明,重复荷载作用下,沥青层模量逐渐减小,而沥青层层底拉应变逐渐增大;在双对数坐标下,模量的衰减及应变与加载次数具有很好的线形相关性;沥青层越薄,温度对沥青层层底拉应变的影响越大,应变变化率与温度呈正比关系;在相同的荷载作用次数下,沥青层越薄,疲劳损伤率越大。In order to find the regularity of fatigue damage of asphalt layer, according to the accelerated loading test of fatigue performance on Beijing ALF test road, the simulation model of short cycle unit gradual fatigue damage was adopted. The fatigue damage was cumulated by Miner theory, and the variation regularities of asphalt layer module and layer bottom tensile strain in the accelerated loading process were analyzed. The results show that （ 1 ） asphalt layer module gradually diminishes and tensile strain of asphalt layer bottom gradually increases ; （2） strain and attenuation of module have good linear relativity with loading in double logarithm coordinate system; （3） the thinner the asphalt layer, the greater the influence of temperature on tensile strain at bottom of asphalt layer, and strain variety ratio is in direct proportion to temperature; （4） under the same loading cycles, the thinner the asphalt layer, the greater the fatigue damage ratio.

关 键 词：道路工程 沥青层 加速加载 疲劳损伤 模量 应变 

分 类 号：U416.217.03[交通运输工程—道路与铁道工程]