行车速度对沥青路面疲劳损伤性能影响的数字试验  

Influence of running speed on fatigue-damage performance of asphalt pavement based on numerical test

作　　者：黄宝涛[1] 袁鑫[1,2] 于蕾[1] 仲秀丽[1] 李俊[3] 

机构地区：[1]江苏科技大学土木工程与建筑学院,江苏镇江212003 [2]东南大学土木工程学院,江苏南京210096 [3]长安大学特殊地区公路工程教育部重点实验室,陕西西安710064

出　　处：《长安大学学报（自然科学版）》2013年第3期14-20,共7页Journal of Chang’an University(Natural Science Edition)

基　　金：国家自然科学基金项目(51109099);江苏省高校自然科学基金项目(12K1B580003);江苏省产学研创新基金项目(SBY201220398);江苏科技大学自然科学基金项目(2012TM126J)

摘　　要：为了准确分析行车速度对沥青路面疲劳性能的影响,为细观动力学疲劳机理研究奠定基础,将沥青混合料内部级配碎石简化为三维不规则颗粒,将沥青的粘结性能转化为不规则颗粒间的平行粘结强度,从三维材料组成的角度进行沥青混合料细观建模,对道路上车辆的真实运行情况进行数字试验,分析行车速度对沥青路面疲劳性能的影响。结果表明:行车速度低时,沥青混合料较行车速度高时的疲劳寿命有大幅度的降低,疲劳寿命随着行车速度的增大而逐渐增大,但增大的趋势逐渐变缓且有重合的趋势;车辆荷载从轻至重的加载对沥青层的损伤应力明显大于车辆荷载从重至轻的加载;行车速度越低,沥青层的损伤应力越大,该级荷载引起的损伤应力波动幅度也越大。In order to investigate the influence law of running speed on asphalt pavement damage performance,so as to provide basis for microscopic kinetic damage mechanism,a numerical test method was used to investigate the damage performance of asphalt pavement submitted to the actual running speed load with a 3D generation algorithm about asphalt mixture.Graded crushed stone in the asphalt mixture was modeled as the irregular particles,and asphalt＇s bond strength was translated into irregular particle parallel bond.The results show that the fatigue life and the actual running speed have the same developing trend;the higher the vehicle running speed,the longer the fatigue life of the asphalt pavement.With actual running speed increasing,the fatigue life increase rate decreases to zero at last.The damage stress on the asphalt layer caused by the sequence from heavy to light load is slighter than that caused by the sequence from light to heavy load.The lower the actual running speed,the higher the asphalt layer damage stress,and the bigger the swing level of damage stress.5 tabs,9 figs,10 refs.

关 键 词：道路工程 损伤性能 数值试验 真实行车速度 

分 类 号：U416.217[交通运输工程—道路与铁道工程]