考虑轮迹横向分布的沥青路面疲劳寿命修正系数  

Correcting factor of asphalt pavement fatigue life considering wheel-path lateral distribution

作　　者：董忠红[1] 吕彭民[1] 

机构地区：[1]长安大学道路施工技术与装备教育部重点实验室,陕西西安710064

出　　处：《长安大学学报（自然科学版）》2011年第6期21-25,共5页Journal of Chang’an University(Natural Science Edition)

基　　金：国家自然科学基金项目(51008030);中央高校基本科研业务费专项资金项目(CHD2010JC063;CHD2011ZD001)

摘　　要：为了研究轮迹横向分布对沥青路面结构使用寿命的影响,道路施工过程中,在沥青面层底部布置动应变传感器,研究移动荷载下半刚性基层沥青路面动力响应横向分布规律。综合考虑轮迹横向分布和路面结构动力响应横向分布,计算得到沥青路面疲劳寿命修正系数。研究结果表明:移动车轮荷载下,沥青面层底部最大纵向拉应变的横向分布呈"M"形,进行沥青路面疲劳寿命评估时,只需要考虑距双排轮胎中心40cm之内位置产生的破坏作用;沥青面层底部横向弯拉应变的横向分布比较复杂,进行疲劳寿命评估时,只需要考虑轮胎下部产生的破坏作用。试验路的疲劳寿命修正系数为0.16,可为类似半刚性基层沥青路面结构设计和疲劳寿命评估提供参考。To study the influence of the wheel-path lateral distribution on the fatigue life of the asphalt pavement,some dynamic strain sensors were buried at the bottom of the AC layer during construction,and the lateral distribution of the dynamic response of the semi-rigid base asphalt pavement was studied.Comprehensively considering the influences of the wheel-path lateral distribution and the dynamic response lateral distribution,the correcting factor of fatigue life of the asphalt pavement was got.The results show that the lateral distribution of the maximum longitudinal tensile strain at the bottom of the asphalt layer shows M shape under moving wheel load,and only the destruction of the position which located within 40 cm away from the center of the double tire is need to be considered when the fatigue life of the asphalt pavement is evaluated.The lateral distribution of the lateral strain at the bottom of the asphalt layer is quite complex,and only the destruction of the position which located under the double tires is need to be considered when the fatigue life of the asphalt pavement is evaluated.The fatigue life correcting factor of the test road is 0.16,which can be referred to the semi-rigid asphalt pavement design and fatigue life evaluation.

关 键 词：道路工程 沥青路面 疲劳寿命修正系数 轮迹横向分布 加速加载试验 动力响应横向分布 

分 类 号：U416.403[交通运输工程—道路与铁道工程]