交叉口区域沥青路面结构设计研究

发布时间：2018-03-25 14:40

本文选题：平面交叉口　切入点：沥青路面　出处：《长沙理工大学》2014年硕士论文

【摘要】：随着我国城市规模的迅速扩大和经济的稳速发展,城市道路承载了越来越多的交通量。伴随着交通量的增长,城市道路中的交叉口路段出现了各种的道路及交通问题。城市道路中平面交叉口的渠化、慢速和水平力较大的特性导致区域内的路面容易产生早起的损坏。交叉口位于若干条道路的相交路段,是城市交通的咽喉之地,这使得交叉口区域的路面需要较高的行驶质量和较长的养护周期,我国高速发展的交通和道路行业也需更为综合、精细化的路面结构设计。因此,针对平面交叉口的交通特性,进行针对性的、独特性的路面结构设计具有重要的意义。首先,对交叉口范围的各种定义进行辨析,得出用于交叉口区域路面设计的交叉口路面设计区的定义。依托于典型的平面十字信号控制交叉口进行建模,对不同水平的主车道和相交车道进口道交通量和各进口道不同的交通流转向组成情况下的交叉口运行状况进行软件的分析和计算,得出各种情况下的进口道车辆排队长度和车辆延误。对不同的路段设计速度下的交叉口路面设计区的上下游长度进行计算,得出不同道路设计车速下的交叉口路面设计区的范围建议值。然后,对交叉口路面设计区内区别于普通路段的交通特性进行计算和分析,特别是对不同交通流转向组成下的道路横断面的轮载作用次数、交叉口物理功能区的轮载叠加次数、不同交通量下的交叉口内车辆运行速度和不同行驶状况下的路面水平力进行计算和分析,找出交叉口区域内不同于普通路段的交通特性,并对涉及路面设计和使用的交通特性进行分析和研究。其次,针对沥青混合料的蠕变特性和交叉口区域内的交通特性,对不同水平力作用下的路面剪应力的分布进行计算分析；并对不同水平的轮载重量、交通量、车速和不同的轮载横向分布状况下的路面竖向变形进行有限元的计算分析,同时对不同的交通流方向组成情况下的路面竖向变形对轮载重量、交通量、车速的敏感性进行分析探讨。得出慢速、水平力、混合料抗剪强度不足特别是层间结合材料在高温下的抗剪强度不足是造成交叉口区域路面早期损坏的根本原因,而不均匀的轮迹横向分布加剧了损坏速度。最后,根据交叉口区域内的交通特性和计算分析结论,提出竖、纵、横全方位的路面结构设计,通过科学有效的路面结构设计,保证交叉口区域道路的使用质量和交通运行的顺畅、安全,并为相同类型区域的道路设计提供新的理念与方法。
[Abstract]:With the rapid expansion of urban scale and the steady development of economy in China, urban roads are carrying more and more traffic volume. There are various road and traffic problems in the intersections of urban roads. The characteristics of slow speed and high horizontal force lead to early morning damage on the road surface in the area. The intersection is located at the intersection of several roads and is the throat of urban traffic. This makes the pavement in intersection area need higher driving quality and longer maintenance period, and the high-speed development of traffic and road industry in our country also need more comprehensive and refined pavement structure design. Therefore, in view of the traffic characteristics of intersections, It is of great significance to design specific and unique pavement structure. First of all, the definition of intersection scope is analyzed. The definition of intersection pavement design area used in intersection area design is obtained, which is based on the modeling of typical cross signal control intersection. The analysis and calculation of the traffic volume of the main lane and the intersecting lane at different levels and the traffic flow of the intersection under the condition of different traffic flow direction of each entrance road are carried out by software. The queue length and vehicle delay are obtained under various conditions. The upstream and downstream lengths of intersection pavement design area at different design speeds are calculated. The range of the design area of intersection pavement under different road design speed is obtained. Then, the traffic characteristics in the design area of intersection road are calculated and analyzed which are different from those in common section. In particular, for the different traffic flow direction of the composition of the road cross-section of the wheel load action times, intersection physical function area of the number of times of the wheel load superposition, In order to find out the traffic characteristics in the intersection area different from the common section, the vehicle running speed and the road surface horizontal force under different traffic volume are calculated and analyzed. Secondly, according to the creep characteristics of asphalt mixture and traffic characteristics in intersection area, the distribution of pavement shear stress under different horizontal forces is calculated and analyzed. At the same time, the vertical deformation of pavement under different load load, traffic volume, speed and lateral distribution of wheel load is calculated and analyzed by finite element method. At the same time, the sensitivity of pavement vertical deformation to wheel load, traffic volume and speed under different traffic flow direction composition is analyzed and discussed. The insufficient shear strength of the mixture, especially the shear strength of the interlayer bonding material at high temperature, is the root cause of the early pavement damage in the intersection area, and the uneven lateral distribution of the wheel track exacerbates the damage speed. According to the traffic characteristic and the calculation analysis conclusion in the intersection area, this paper puts forward the road surface structure design of vertical, longitudinal and transverse directions, which can ensure the smooth use quality and traffic operation of the road in the intersection area through the scientific and effective pavement structure design. Safety, and provide new ideas and methods for road design in the same type of area.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.217

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