AASHTO 2002沥青路面永久变形叠加方法验证

沥青路面的永久变形叠加问题是永久变形研究中的难点。首先对现有的用于沥青路面中的叠加方法进行了分析,指出其不适合于永久变形叠加问题;而后对AASHTO 2002柔性路面设计指南中的永久变形叠加方法进行了简要介绍,并采用两种APA试验方法对AASHTO叠加方法进行了验证。验证结果表明,AASHTO方法并不能准确预估永久变形;应力历史对永久变形叠加结果有很大影响,而以应变硬化原理为基础的AASHTO叠加方法不能体现应力历史的影响。因此,AASHTO 2002的叠加方法还存在着一些局限,需要进行修订。

Validation of Superposition Method of Permanent Deformation of Asphalt Pavement in AASHTO 2002 Flexible Pavement Design Guide

Superposition method of permanent deformation is a difficulty in research on permanent deformation of asphalt pavement for a long time.First,superposition methods used in asphalt pavement at present were introduced briefly and analyzed,and those methods unfit for permanent deformation were indicated.Second,superposition method of permanent deformation for asphalt pavement in AASHTO 2002 flexible pavement design guide was introduced briefly.At last,superposition method in AASHTO 2002 design guide was validated using two kinds of APA tests.The first validation indicates that AASHTO method cannot estimate permanent deformation exactly.The second validation implies that stress history has important influence on the superposition result of permanent deformation,and the AASHTO method,which based on the principle of strain hardening,cannot reflect the influence of stress history.As a result,it is very necessary to do some modification for the superposition method in AASHTO 2002 design guide.