非均布移动荷载作用下黏弹性沥青路面动力响应分析

发布时间：2018-04-05 15:17

  本文选题：道路工程　切入点：非均布移动荷载　出处：《重庆交通大学学报(自然科学版)》2017年03期

【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。
[Abstract]:Based on the dynamic shear modulus of Witczak viscoelastic model, a three-dimensional finite layer model for transient dynamic analysis of asphalt pavement structure under non-uniform moving load is established.The time-history variation and transverse distribution of the dynamic response of asphalt pavement under different road temperature and vehicle speed are analyzed by 3D-MOVE Analysis software, and the results are compared with the results of uniformly distributed moving load.The results show that the dynamic response of pavement structure has alternating characteristics, the strain recovery of base and soil is delayed, the stress and strain concentration appears on the top of surface layer, and the lateral distribution of dynamic response of pavement is asymmetric in the region of double wheel loading.The peak value of each dynamic response appears in different transverse position; compared with uniform moving load, the dynamic response under non-uniform moving load changes slightly along the transverse direction; with the increase of vehicle speed,The dynamic response at the bottom of the surface layer decreases first and then increases, with a peak point with a critical velocity of about 48 km / h. When the pavement temperature is increased from -10 鈩，

本文编号：1715331