非均布移动荷载作用下黏弹性沥青路面动力响应分析  

Dynamic Response of Viscoelastic Asphalt Pavement under Non-uniform Moving Load

作　　者：黄志义[1] 陈雅雯[1] 颜可珍[2] 

机构地区：[1]浙江大学交通工程研究所,浙江杭州310058 [2]湖南大学土木工程学院,湖南长沙410082

出　　处：《重庆交通大学学报（自然科学版）》2017年第3期30-35,53,共7页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：交通运输部交通建设科技项目(2011318806780)

摘　　要：基于实测非均布车辆荷载移动特性,采用Witczak黏弹性模型动态剪切模量,建立了非均布移动荷载作用下沥青路面结构瞬态动力分析的三维有限层模型,通过3D-MOVE Analysis软件分析不同路面温度、不同车辆行驶速度下沥青路面动力响应的时程变化和横向分布规律,并与均布移动荷载的计算结果进行比较。结果表明:路面结构层动力响应具有交变特性;基层与土基应变恢复具有滞后现象;面层顶面出现应力应变集中现象;在双轮加载区域内路面动力响应横向分布具有非对称性,各动力响应峰值出现在不同横向位置上;与均布移动荷载比较,非均布移动荷载作用下的动力响应沿横向变化较小;随着车辆行驶速度的增加,面层底部动力响应先减小后增大,有一个峰值点,临界速度约为48 km/h;当路面温度由-10℃升高至50℃时,面层底部纵向、横向应变突变幅度分布分别增加了2.75,1.53倍,面层底部剪应力显著增加,且高温下面层底部剪应力容易出现应力集中现象。Based on moving characteristics of the measured non-uniform vehicle load,the dynamic shear modulus of Witczak viscoelastic model was used to establish a three-dimensional finite layer model of asphalt pavement with transient dynamic analysis under non-uniform moving load.The change of time course and the lateral distribution discipline of asphalt pavement dynamic response were analyzed by using 3D-MOVE Analysis software in the cases of different pavement temperature and different vehicle velocity.The above results were compared with the computation results of uniform moving loads.The results show that：the dynamic response of pavement structure has alternating characteristics;base and subgrade strain recovery occur hysteresis phenomenon;the top of surface layer shows stress strain concentration;the transverse distributions of pavement dynamic response exhibit asymmetry in wheel loading area,and the transverse distributions of the maximum dynamic response are different;compared with dynamic response under uniform moving load,the dynamic response under non-uniform moving load has smaller change along the transverse direction;with the increase of the vehicle speed,the dynamic response of surface bottom decreases firstly and then increases,there is a peak point,the critical speed is about 48 km/h;as the pavement temperature increases from-10 ℃ to 50 ℃,the longitudinal strain and transverse strain of surface bottom increases by 2.75 times and 1.53 times respectively;the shear stress of surface bottom increases significantly,and the shear stress of surface bottom is prone to stress concentration below high temperature.

关 键 词：道路工程 非均布移动荷载 有限层模拟 沥青路面 动力响应 

分 类 号：U416.217[交通运输工程—道路与铁道工程]