基于四川气候和轴载要求的半刚性基层沥青路面设计研究

发布时间：2018-03-28 14:37

本文选题：半刚性沥青路面　切入点：耐久性　出处：《长安大学》2015年博士论文

【摘要】：半刚性基层沥青路面是我国应用最为广泛的路面类型。四川地域辽阔,路面以半刚性基层沥青路面为主,各地路面修筑条件差距甚远,客观上又加剧了设计与施工的困难。目前沥青路面规范在气候、轴载条件与材料设计相联系的设计方法上存在不足,导致沥青路面耐久性差。因此,开展基于四川气候和轴载要求的半刚性基层沥青路面的设计研究,构建控制基层开裂与面层车辙的结构与材料一体化设计方法,提出适用于四川不同分区的沥青混合料动稳定度标准和水泥稳定碎石强度设计标准,对防止四川地区沥青路面的车辙与开裂、提高其耐久性,具有重要的实际指导意义。本文首先对四川地区的气候条件、路面结构及使用状况展开了调查,提出了四川省沥青路面使用性能气候分区,通过调查发现面层车辙和基层开裂是四川省半刚性基层沥青路面的主要病害。采用振动法设计水泥稳定碎石,研究了水泥稳定碎石的力学特性、疲劳特性,建立了强度增长模型、力学指标间的关系及疲劳方程;提出了水泥稳定碎石的路面结构设计参数,提高了路面结构设计的可靠性;研究了基于疲劳破坏的水泥稳定碎石强度设计标准、提出了控制收缩开裂的水泥稳定碎石骨架密实级配,在此基础上开发了抗裂水泥稳定碎石的设计方法。通过室内试验、力学响应分析等,建立了沥青混合料的车辙预估模型,并基于MEPDG车辙非线性叠加方法提出了路面车辙预估的方法;在此基础上,提出了沥青混合料动稳定度标准的确定方法,采用该方法确定的动稳定度标准与温度、交通量、层位、力学响应及行车速度相关联。分析了我国沥青路面设计方法存在的缺陷,提出了控制基层开裂和面层车辙的一体化设计方法,并给出了设计示例;推荐了不同土基回弹模量下的水稳基层的强度设计标准、不同分区不同沥青面层层位的动稳定度容许值,为四川不同分区的半刚性基层沥青路面设计提供参考。
[Abstract]:Semi-rigid base asphalt pavement is the most widely used pavement type in China. Sichuan has a vast territory, the pavement is mainly semi-rigid base asphalt pavement, and the conditions of pavement construction are far from each other. Objectively speaking, the difficulties in design and construction have been aggravated. At present, there are some deficiencies in the design method of asphalt pavement specifications which are related to the climate, axle load condition and material design, which lead to the poor durability of asphalt pavement. Based on the requirements of climate and axle load in Sichuan, the design of semi-rigid base asphalt pavement is carried out, and an integrated design method of structure and material is constructed to control the cracking of base course and rutting of surface layer. The dynamic stability standard of asphalt mixture and the design standard of cement stabilized macadam strength are put forward, which can prevent the rutting and crack of asphalt pavement in Sichuan area and improve its durability. It is of great practical significance. Firstly, this paper investigates the climatic conditions, pavement structure and service conditions of Sichuan Province, and puts forward the climatic partition of asphalt pavement performance in Sichuan Province. Through investigation, it is found that rutting and cracking of pavement are the main diseases of asphalt pavement with semi-rigid base in Sichuan province. The mechanical and fatigue characteristics of cement stabilized crushed stone are studied by using vibration method to design cement stabilized crushed stone. The strength growth model, the relationship between mechanical indexes and fatigue equation are established, and the design parameters of pavement structure of cement stabilized crushed stone are put forward to improve the reliability of pavement structure design. The strength design standard of cement stabilized macadam based on fatigue failure is studied, and the dense gradation of cement stabilized macadam framework controlled by shrinkage cracking is put forward. On this basis, the design method of crack resistant cement stabilized macadam is developed. On the basis of mechanical response analysis, the rut prediction model of asphalt mixture is established, and the method of pavement rutting prediction based on MEPDG rutting nonlinear superposition method is put forward, and on this basis, the determination method of asphalt mixture dynamic stability standard is put forward. The dynamic stability standard determined by this method is related to temperature, traffic volume, horizon, mechanical response and driving speed. The defects of asphalt pavement design method in China are analyzed. An integrated design method for controlling cracking and rutting of surface layer is put forward, and an example is given, and the strength design standard of water stabilized base under different modulus of resilience of soil foundation is recommended. The allowable values of dynamic stability of different asphalt layers in different subzones provide a reference for the design of semi-rigid base asphalt pavement in different districts of Sichuan.
【学位授予单位】：长安大学
【学位级别】：博士
【学位授予年份】：2015
【分类号】：U416.217

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