基于VISSIM的长安立交合流区通行能力仿真研究-计算机技术专业论文.docxVIP

Research on Merging Area’s Capacity of Chang’anInterchange Based on VISSIMSimulation A Dissertation Submitted for the Degree of Master Candidate：Zhang Teng Supervisor：Prof. Ma Ronggui Chang’an University, Xi’an, China 摘要 城市环线互通立交是城市快速路网的节点，要提高整个路网通行能力，提高互通立 交的通行能力是关键。目前，我国很多城市修建了城市快速路系统，特别是近些年城市 快速路系统更是取得了长足的发展，但是与之相应的理论研究却相对落后，尤其是对快 速路互通立交系统的各个组成部分及整体通行能力方面的研究更是缺乏，这对快速路互 通立交系统的规划与设计以及选型评价都是非常不利的，而互通立交合流区作为其重要 组成部分，由于其内部的加速车道车辆的合流行为，引起主线交通紊乱，速度降低，延 误增大，往往成为快速路系统的“瓶颈”地段，因此，非常有必要对其进行相关研究。 本文针对西安市南二环长安立交合流区，进行了立交合流区通行能力的研究。通过 不同数据统计间隔的对比分析，确定适合长安立交合流区交通特性的统计时间间隔，在 此基础上对合流区交通流统计特征进行分析，得到了不同车道在同一位置的车道流量及 速度关系，以长安立交的实际观测数据为依据，通过合流区“速度-流量”关系趋势外 推得出合流区通行能力约为 5500pcu/h，临界速度约为 34.79km/h。 以西安市南二环长安立交东西方向合流区通行能力为研究对象，运用 VISSIM 仿真 软件对合流区交通流特征进行仿真研究，以实测交通流特征为依据，对仿真模型效果进 行验证，通过不断增加主线和进口匝道的输入交通量，当主线流量达到 4300pcu/h，进 口匝道流量达到 1350pcu/h 时，合流区流量达到最大，即长安立交合流区实际通行能力 计算值为 5650pcu/h。 关键词：互通立交，通行能力，合流区，交通仿真 i Abstract As the node of the urban expressway networks,the traffic capacity of urban ring roads alternative interchange is the key to improve the traffic capacity of the whole road network.Nowadays, urban express road system were built in many city of china, especially urban freeway system is achieved considerable development in these years.However,the corresponding theoretical research is relatively backward, especially in terms of research on the part of the various components and the overall the traffic capacity freeway interchange system even less,This is adverse to the planning and design and type selection evaluation of express road alternative interchange system.And the merge area of alternative interchange is a very important part of it, because of merge of cars in acceleration lane leads the disorder of mainline traffic, further more low the speed of cars. In the end this area become a bottleneck of express road system. Therefore, it is very necessary to make a future study. This article in connection with the merge area of the second ring of south Xi’an and carry out the study