路基回弹模量对刚性路面疲劳寿命的影响分析  

Effect Analysis of Subgrade Resilient Modulus on Pavement Fatigue Life for Rigid Pavement

作　　者：林小平[1] 凌建明[2] 周亮[2] 

机构地区：[1]交通运输部科学研究院,北京100029 [2]同济大学道路与交通工程教育部重点实验室,上海200092

出　　处：《武汉理工大学学报（交通科学与工程版）》2012年第2期262-265,共4页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：交通部西部交通建设科技项目资助(批准号:200731822301)

摘　　要：基于大型通用有限元软件ABAQUS,建立水泥混凝土路面结构体系三维有限元模型,针对2种路面结构形式和2种轴重的轴载作用,计算不同路基回弹模量下的路面结构响应,结合水泥混凝土疲劳方程,分析路基回弹模量对路面结构疲劳寿命的影响.结果表明,随着路基模量的增加,板底应力水平及变化率近似呈线性水平降低,而路面疲劳寿命与疲劳寿命折减率则呈现出较为明显的非线性变化,应力水平变化不大的条件将使得路面结构疲劳寿命产生显著影响;提高路基回弹模量在较高区间(40～60kPa)将更加显著增大路面疲劳寿命,另外,增大轴载会使路面结构疲劳寿命显著降低.Based on ABAQUS,a 3D finite element model for rigid pavement was established with respect to two types of pavement structures and axle loads,and pavement structural response was calculated with various subgrade resilient modulus.Combined with concrete fatigue function,the effect of subgrade resilient modulus on pavement fatigue life was analyzed.The results indicate that the value of stress in slab bottom and its change rate decrease linearly with the increase of subgrade resilient modulus,while pavement fatigue life and its reduction rate change non-linearly with the increase of subgrade resilient modulus,and pavement fatigue life change more significantly than stress in slab bottom with the variety of subgrade resilient modulus.The pavement fatigue life increase more significantly with the increase of subgrade resilient modulus which in the range of 40~60kPa,and decrease remarkably with the increase of axle load.

关 键 词：路基回弹模量 路面疲劳寿命 影响分析 结构响应 

分 类 号：U416.1[交通运输工程—道路与铁道工程]