城市道路交叉口沥青路面荷载特征分析与车辙防治研究

发布时间：2018-07-03 03:12

  本文选题：道路交叉口 + 制动　； 参考：《东南大学》2015年硕士论文

【摘要】：目前关于沥青路面的车辙研究工作有很多,但单独针对城市道路交叉口的车辙病害研究较少。城市道路交叉口车辆频繁的制动和启动,并且伴随着大量长时间的停车现象,车辆荷载的作用方式与其他路段大为不同,路面病害较之其他路段要严重很多。本课题根据城市道路交叉口实际的交通状况和荷载作用方式,探索交叉口路面病害的主要原因,并对城市道路交叉口沥青路面的设计提出一些建议。首先,选取南京市主干道部分交叉口,对交通量、信号配时、主要车型、各车型比例等交通信息进行调研,并针对南京市道路交叉口的历史和现状路面病害进行了调查。其次,以小轿车和公交车作为研究车型,确定其技术质量参数,根据车辆制动性能、路面平整状况和路面摩擦系数,分析车辆的轴载和水平力变化。再次,根据交叉口荷载特征的特殊性,研究了不同制动条件下的路面结构力学响应,比较交叉口荷载与标准设计荷载力学响应的差异,提出交叉口路面设计应力和应变控制建议。接着,确定路面典型结构和面层级配,并针对中面层提出五种不同的设计方案。介绍了局部三轴试验的原理,并根据道路交叉口路面的受力特征,确定沥青混合料的蠕变方案,比较荷载不同作用方式、不同大小和不同的路面材料在不同温度下(20℃,40℃,60℃),沥青混合料的蠕变变形规律。最后,通过调查研究,分别确定城市道路与高速公路的表面边界条件,选择相同的路面结构和材料,比较二者路面温度场的差异。运用有限元模拟方法,分析气候温度、荷载作用方式、荷载大小和路面材料对车辙变形的影响,并确定车辙增长较快的温度范围和各层车辙贡献比例,并提出控制车辙病害的一些方法,探讨了交叉口区域以车辙变形为依据的轴载换算方法。
[Abstract]:At present, there are a lot of researches on rutting of asphalt pavement, but there are few researches on rutting diseases of urban road intersections alone. With the frequent braking and starting of vehicles in urban road intersections, and accompanied by a large number of parking phenomena for a long time, the action of vehicle loads is very different from that of other sections, and the road surface diseases are much more serious than other sections. According to the actual traffic situation and load mode of urban road intersection, the main causes of pavement disease are explored, and some suggestions are put forward for the design of asphalt pavement in urban road intersection. Firstly, the traffic information such as traffic volume, signal timing, main vehicle type and proportion of each type are investigated by selecting some intersections of the main road in Nanjing, and the road diseases in history and present situation of the intersection in Nanjing are investigated. Secondly, taking the car and bus as the research vehicle, the technical quality parameters are determined. According to the braking performance of the vehicle, the pavement leveling condition and the friction coefficient of the road surface, the change of the axle load and the horizontal force of the vehicle is analyzed. Thirdly, according to the particularity of intersection load characteristics, the mechanical response of pavement structure under different braking conditions is studied, and the difference between intersection load and standard design load mechanical response is compared. The control suggestion of stress and strain in intersection pavement design is put forward. Then, the typical pavement structure and surface layer grading are determined, and five different design schemes are proposed for the middle surface layer. This paper introduces the principle of local triaxial test, determines the creep scheme of asphalt mixture according to the stress characteristics of road surface at road intersection, and compares the different action modes of load. The creep deformation law of asphalt mixture is obtained with different sizes and different pavement materials at different temperatures (20 鈩，

本文编号：2092140