基于结构层寿命递增的耐久性沥青路面设计新思想

发布时间：2018-03-02 18:07

本文选题：道路工程　切入点：沥青路面　出处：《中国公路学报》2014年01期 　论文类型：期刊论文

【摘要】：为了建立科学的耐久性沥青路面设计新思想,通过力学分析探究了沥青路面近表面的应力分布特征,论证了以路表荷载作用区边缘作为沥青路面破坏源的合理性。针对中国现行沥青路面疲劳设计方法的缺陷,开展了沥青混合料疲劳试验,在考虑加载速度影响的基础上,建立了以真实应力比表征的沥青混合料疲劳方程。结合中国沥青路面各结构层设计寿命相等所诱发的问题以及实际沥青路面结构的破坏特征,提出了各结构层自上而下设计寿命递增的沥青路面结构设计新思想和耐久性沥青路面结构设计新理念。结果表明:沥青面层近表面是其真正的破坏源;基于真实应力比的疲劳方程反映了材料的本质特征;耐久性沥青路面的各结构层应采用疲劳寿命递增的方法进行设计。
[Abstract]:In order to establish a new scientific design idea of durable asphalt pavement, the stress distribution characteristics near the surface of asphalt pavement are studied through mechanical analysis. This paper demonstrates the rationality of using the edge of the road surface load zone as the source of asphalt pavement damage. Aiming at the defects of the current asphalt pavement fatigue design method in China, the asphalt mixture fatigue test is carried out, on the basis of considering the effect of loading speed. The fatigue equation of asphalt mixture characterized by true stress ratio is established. The problems caused by the equal design life of each structure layer of asphalt pavement in China and the failure characteristics of actual asphalt pavement structure are established. A new idea of asphalt pavement structure design with increasing design life from top to bottom and a new concept of durability asphalt pavement structure design are put forward. The results show that the near surface of asphalt pavement is the real source of damage. The fatigue equation based on the true stress ratio reflects the essential characteristics of the material, and the structural layers of the asphalt pavement should be designed by the method of increasing fatigue life.
【作者单位】：长沙理工大学公路工程教育部重点实验室;
【基金】：国家自然科学基金项目(50178012,51208066) 交通运输部交通应用基础研究项目(2012-319-825-150) 教育部高等学校博士学科点专项科研基金项目(20114316120001)
【分类号】：U416.217

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