单点干道交叉口施工期组织优化及信号控制研究

发布时间：2018-11-05 11:56

【摘要】：随着城市经济的快速发展,机动车有着明显的增长趋势,给城市带来严重的交通拥堵,为满足城市居民的出行需求,城市加快轨道交通的建设。地铁建设规模大、工期长等特点决定了地铁建设会长期占用本已紧张的道路资源,带来一定程度的负面影响。为此,进行施工区的交通疏导以及影响区的交通组织研究有着重要的意义,本文对信号交叉口施工期间的交通组织及信号控制进行研究。本文重点研究城市干道交叉口长期半封闭车道状态下施工期带来的交通问题。首先介绍交叉口几种施工工艺,重点分析交叉口采用明挖法施工对人员、交通流、道路以及周边环境的影响,并分析交叉口施工围挡对其通行能力造成的影响,选用瞬时线源模型界定交叉口施工期间影响区域,确定有效的交通组织范围。其次探讨影响区的几种主要交通组织方式,并利用基于Logit的SUE分配模型,将交叉口因施工转移的交通量合理分配到周边影响区路网上,而又不会造成新的交通拥堵点;为充分发挥支路网的通行潜能,降低主干路的饱和度,建立以饱和度最小化为优化目标的双层规划模型并编写遗传算法求解,进行影响区内支路网的单双行交通组织,以此改善整个影响区域路网的运行状态,缓解施工交叉口的交通压力,并用简单理想化案例进行可行性验证。通过对交叉口施工围挡分析,进、出口车道数减少造成车辆发生转移,现有的信号配时方案难以满足车辆通行,需要对转移后的交叉口各进口道流量进行信号配时优化,建立以交通冲突、进口车道数、通行能力、延误时间、排队长度为指标的多目标评价函数,实现信号配时的整体最优;并对倒计时信号控制造成的赶绿灯和抢红灯行为进行安全性分析,最终,基于安全角度考虑在设置倒计时信号灯时,绿灯、黄灯不显示相应的剩余时间,红灯显示相应的剩余时间。最后,运用相关理论对雁塔北路与友谊东路交叉口施工期间进行交通组织研究,确定影响范围,对影响区进行合理的支路网单双行组织,优化施工交叉口的信号控制,并利用Vissim对信号配时方案评价,最终设置施工交叉口禁左,并结合影响区路网的单双行组织,有效引导疏散左转车流,减少交叉口禁左带来的不便,确定最佳信号配时方案。
[Abstract]:With the rapid development of urban economy, motor vehicles have an obvious growth trend, which brings serious traffic congestion to the city. In order to meet the travel needs of urban residents, the city speeds up the construction of rail transit. The large scale of subway construction and the long construction period determine that subway construction will occupy the scarce road resources for a long time and bring some negative effects. Therefore, it is of great significance to study the traffic diversion and traffic organization of the affected area. This paper studies the traffic organization and signal control during the construction of signalized intersection. This paper focuses on the traffic problems caused by the long-term semi-closed lane of the urban main road intersection. This paper first introduces several construction techniques of intersections, and analyzes the influence of the construction of intersections on people, traffic flow, roads and the surrounding environment, and analyzes the influence of construction barriers on the capacity of intersections. The instantaneous line source model is used to define the influence area of intersection during construction, and the effective traffic organization range is determined. Secondly, several main traffic organization modes in the affected area are discussed, and by using the SUE allocation model based on Logit, the traffic volume transferred from the intersection due to construction can be reasonably allocated to the road network of the surrounding affected area without causing new traffic congestion points. In order to give full play to the potential of the branch network and reduce the saturation of the trunk road, a bilevel programming model with minimum saturation as the optimization objective is established and the genetic algorithm is written to solve the problem, and the single and double traffic organization affecting the branch network in the region is carried out. In order to improve the operation state of the whole regional road network, alleviate the traffic pressure of the construction intersection, and use simple idealized cases to verify the feasibility. Through the analysis of the construction block at the intersection, the reduction of the number of entry and exit lanes leads to the transfer of vehicles, and the existing signal timing scheme is difficult to meet the vehicle traffic, so it is necessary to optimize the signal timing of the flow at the intersections after the transfer. A multi-objective evaluation function based on traffic conflict, number of entry lanes, capacity, delay time and queue length is established to achieve the overall optimal signal timing. Finally, based on the safety analysis of green light and red light snatching caused by countdown signal control, the green light and yellow light do not show the corresponding remaining time when setting the countdown signal light based on the safety point of view. The red light displays the corresponding remaining time. Finally, the traffic organization of the intersection of Yanta North Road and Friendship East Road is studied by using the relevant theory, the influence range is determined, the influence area is reasonably organized in the branch network, and the signal control of the construction intersection is optimized. Using Vissim to evaluate the signal timing scheme, finally set up the construction intersection forbidden left, and combined with the single and double line organization of the road network in the affected area, effectively guide the evacuation of the left turn traffic flow, reduce the inconvenience caused by the intersection left ban, and determine the best signal timing scheme.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U491

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