车辆多轮随机荷载作用下柔性沥青路面动态响应研究

发布时间：2018-07-07 13:32

本文选题：重型车辆 + 路面不平度　；参考：《青岛大学》2017年硕士论文

【摘要】：随着公路建设的不断推进,对公路设计及公路损伤机理的研究也提出了更高的要求。车辆荷载的反复作用是导致沥青路面破坏的主要原因之一。本文针对柔性沥青路面的结构和材料特点,考虑了土基的弹塑性和粘性,建立了沥青混凝土路面和考虑沥青材料粘弹性的SMA路面两种柔性沥青路面的三维有限元模型,并对车辆多轮三向随机荷载的施加方式进行了研究,对重型车辆随机荷载作用下的两种柔性沥青路面的动态响应进行了研究。仿真计算得到了两种柔性沥青路面的应力和应变大小及变化规律,及不同车速下沥青混凝土路面的应力、应变变化。结果表明,相比于法向、纵向、侧向随机荷载单独作用,在车辆多轮三向随机荷载作用下的沥青混凝土路面产生了更大的各向应力、应变,可见以往只考虑车辆法向荷载的方法不够准确;沥青混凝土路面面层各向最大应力、应变随着速度增加不断变大。在车辆随机荷载作用下沥青混凝土路面和SMA路面的破坏方式不同,沥青混凝土路面从水泥稳定碎石下面层最先开始产生疲劳破坏,而SMA路面则是从沥青Sup25下面层开始产生破坏。论文的研究成果可为柔性沥青路面的结构设计及路面性能研究提供指导作用,同时为路面响应计算和路面寿命预测提供参考依据。
[Abstract]:With the continuous development of highway construction, the research on highway design and damage mechanism has put forward higher requirements. The repeated action of vehicle load is one of the main causes of asphalt pavement damage. In this paper, according to the structure and material characteristics of flexible asphalt pavement, considering the elastoplasticity and viscosity of soil foundation, the three-dimensional finite element models of asphalt concrete pavement and SMA pavement with viscoelasticity of asphalt material are established. The dynamic response of two kinds of flexible asphalt pavement under random load is studied. The magnitude and variation of stress and strain of two kinds of flexible asphalt pavement and the variation of stress and strain of asphalt concrete pavement under different speed are obtained by simulation. The results show that, compared with the normal, longitudinal and lateral random loads alone, the asphalt concrete pavement under the action of multi-wheel and three-direction random loads produces more stress and strain in each direction. It can be seen that the method of only considering the normal load of vehicles is not accurate enough, and the maximum stress and strain in each direction of the surface layer of asphalt concrete pavement are increasing with the increase of speed. The failure modes of asphalt concrete pavement and SMA pavement are different under the random load of vehicle. The asphalt concrete pavement begins to produce fatigue damage from the cement stabilized macadam layer, while the SMA pavement starts from the asphalt Sup25 layer. The research results of this paper can provide guidance for structural design and pavement performance research of flexible asphalt pavement, and also provide reference for pavement response calculation and pavement life prediction.
【学位授予单位】：青岛大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U416.217

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