沥青路面FWD反算模量的温度修正方法  

A Method of Temperature Correction on FWD Back-calculation Modulus of Asphalt Pavement

作　　者：周延翱 宋小金[2,3] 潘勤学 ZHOU Yanao;SONG Xiaojin;PAN Qinxue(China Railway Construction Bridge Engineering Bureau Group Co.,Ltd.,Tianjin 300300,China;College of Civil Engineering,Hunan University,Changsha,Hunan 410082,China;Hunan Huacheng Testing Technology Co.,Ltd.,Changsha,Hunan 410205,China;School of Traffic and Transportation Engineering,Changsha University of Science&Technology,Changsha,Hunan 410114,China)

机构地区：[1]中国铁建大桥工程局集团有限公司,湖南长沙410017 [2]湖南大学土木工程学院,湖南长沙410082 [3]湖南华城检测技术有限公司,湖南长沙410017 [4]长沙理工大学交通运输工程学院,湖南长沙410114

出　　处：《公路工程》2021年第3期202-207,共6页Highway Engineering

基　　金：国家自然科学青年基金项目(51908071)。

摘　　要：为明确温度对沥青路面反算模量的影响,采用FWD对4种沥青路面结构,在不同温度下进行了弯沉盆试验。采用软件进行了模量反算,对路面沥青层反算模量的温度修正系数K与温度的关系进行分析,由此建立了温度修正模型,并针对现行设计规范和检测规程对沥青层温度取值的不同要求,分别进行参数规划求解,拟合效果良好。该模型满足在极高温度和极低温度存在两条渐近线,且当T=20℃时,K为1的要求。经比较证明,该模型弥补了原有方法随着温度的增加而无限增大和温度的降低而趋向于0的缺点,符合实际,可应用于FWD评价沥青层力学性质的方法中。In order to determine the influence of temperature on the back-calculated modulus of asphalt pavement,deflection basins of four kinds of asphalt pavement structures were tested by FWD at different temperatures,and the modulus was obtained by back-calculation with software.Then the relationships were analyzed between the temperature and temperature correction coefficient K of the back-calculation modulus of pavement asphalt layer,and a temperature correction model is established.The parameter is obtained according to the different requirements of current design specification and inspection regulations on the temperature value of asphalt layer,and the fitting result is considerable.This model satisfies the requirement that there were two asymptotic lines at extremely high and low temperatures,and K is 1 when T=20℃.Compared with the original method,it is proved that the model is the shortcomings of original method that modulus increases infinitely with the increase of temperature and tends to be zero with the decrease of temperature is improved.It is consistent with practical significance and can be used in the method of evaluating the mechanical properties of asphalt layers by FWD.

关 键 词：沥青路面 落锤式弯沉仪(FWD) 反算模量 温度 修正系数 模型 

分 类 号：U416.217[交通运输工程—道路与铁道工程]