基于AASHTO 2002的沥青路面永久变形叠加方法研究

Superposition Method of Permanent Deformation of Asphalt Pavement Based on AASHTO 2002 Design Guide

介绍了AASHTO 2002力学经验法设计指南中的永久变形叠加方法,在考虑应力历史、路面温度和荷载作用次数等因素的基础上,通过APA试验进行各种工况下的永久变形叠加模拟.提出以实测永久变形值与AASHTO叠加变形值之比作为AASHTO修正系数,明确了影响R主要因素包括前一个子季节的路面温度T1和永久变形D1、当前子季节的路面温度T2载作用次数N2;最终采用指数方程的形式建立了基于AASHTO 2002的永久变形叠加方程.

Firstly,superposition method of permanent deformation of asphalt pavement in AASHTO 2002 design guide was introduced briefly.Secondly,experiments simulations were performed using APA（asphalt pavement analyzer） with stress history,pavement temperature and number of loading cycles considered;Thirdly,the ratio（R） of permanent deformation measured by APA and superposed by AASHTO 2002 design guide was proposed to correct superposition method of permanent deformation in AASHTO 2002 design guide.Influencing factors of were determined and included pavement temperature of last subseason（T1）,permanent deformation at the end of last subseason（D1）,pavement temperature of current subseason（T2） and number of load cycles of current subseason（N2）.Modified AASHTO equation was founded using exponent equation and coefficients were regressed using least square method.