高模量沥青混凝土在半刚性基层长寿命沥青路面中应用的合理性研究  

Study on Rationality of Application of High Modulus Asphalt Concrete in Long-life Semi-rigid Base Asphalt Pavement

作　　者：杨光[1,2] 王旭东[1,2] YANG Guang;WANG Xu-dong(School of Transportation Science and Engineering,Harbin Institute of Technology,Harbin Heilongjiang 150090,China;Research Institute of Highway,Ministry of Transport,Beijing 100088 ,China)

机构地区：[1]哈尔滨工业大学交通科学与工程学院,黑龙江哈尔滨150090 [2]交通运输部公路科学研究院,北京100088

出　　处：《公路交通科技》2019年第5期20-26,56,共8页Journal of Highway and Transportation Research and Development

基　　金：交通运输部应用基础研究项目(2013319223010)

摘　　要：为了修筑更具耐久性的半刚性基层长寿命沥青路面,探究高模量沥青混凝土在半刚性基层长寿命沥青路面应用的合理性及可行性,采用弹性层状体系模型分析了不同层间结合状态和不同下面层模量对路面典型结构力学状态的影响。进而通过不同温度、不同控制模式的四点弯曲疲劳试验,评价了高模量沥青混凝土的抗疲劳特性,采用累积耗散能指标将其与表面层材料进行了比较。结果表明:对于薄面层的半刚性基层沥青路面,当沥青面层与半刚性基层的层间结合状态不能处于完全连续状态时,沥青面层底部将会产生明显的拉应力和拉应变,沥青面层存在弯拉疲劳损伤的风险;随着下面层模量的增加,沥青面层底部的剪应力略有增加,而最大剪应力均值有所减小,有利于改善沥青下面层的抗剪能力;不同控制模式下高模量沥青混凝土的抗疲劳性能有所差别,而采用累积耗散能指标可以有效地将应力、应变两种不同控制模式的疲劳方程进行统一,20℃时高模量沥青混凝土具有更好的抗疲劳性能;在半刚性基层长寿命沥青路面中,下面层使用高模量沥青混凝土可以改善路面的抗车辙和抗疲劳性能,为实体工程建设提供一定的参考依据。In order to build a more durable long-life semi-rigid base asphalt pavement, and to explore the rationality and feasibility for the application of high modulus asphalt concrete in long-life semi-rigid base asphalt pavement, the elastic layered system model is used to analyze the effects of different interlayer bonding conditions and different moduli of bottom layer on Mechanical state of typical pavement structure. Then, four-point fatigue tests at different temperatures and controlling modes are conducted to evaluate the anti-fatigue property of high modulus asphalt concrete, and the indicator of accumulated dissipated energy is adopted to compare with that of surface layer material. The result indicates that(1) for semi-rigid base asphalt pavement with thinner surface layer, tensile stress and strain are generated at bottom of asphalt surface layer with discontinuous interlayer condition between the asphalt surface layer and semi-rigid base layer, and asphalt surface layer has a risk of flexural fatigue damage;(2) with the increase of lower surface layer’s modulus, the shear stress at bottom of surface layer has a slight increase, but the average of the maximum shear stress decreases, which is conductive to improve the shear capacity of the lower surface layer;(3) there are differences for the anti-fatigue properties of high modulus asphalt concrete in different controlling modes, and accumulated dissipated energy can be used to unify the fatigue equations of stress control mode and strain control mode effectively, and high modulus concrete has a better anti-fatigue performance at 20 ℃;(4) the anti-rutting and anti-fatigue performance can be improved by using the high modulus asphalt concrete in lower surface layer for semi-rigid base asphalt pavement, and it can be a reference for the actual construction.

关 键 词：道路工程 高模量沥青混凝土 路面力学分析 长寿命沥青路面 层间结合状态 四点弯曲疲劳试验 累积耗散能 

分 类 号：U416.217[交通运输工程—道路与铁道工程]