城市快速路下匝道出口与邻接交叉口衔接部长度及改善措施研究

发布时间：2018-03-26 13:40

本文选题：城市快速路　切入点：衔接部长度　出处：《长安大学》2014年硕士论文

【摘要】：目前，我国各大中城市交通拥堵已成城市交通的主要问题，为了缓解城市路网交通压力，许多城市开始修建快速路系统，高架桥与互通式立交是快速路系统中重要组成部分。我国城市人口密集造成城市道路网的密度也相应较大，较大的路网密度使城市快速路系统在设计时往往将下匝道出口落地点布置在与快速路立交相邻接的平面交叉口附近，故衔接部的长度往往受到路网规划的限制，也未考虑衔接部的设计长度能否满足后期通行能力和行车安全的需要，造成快速路建成后衔接部成为整个道路通行能力的瓶颈和事故多发点。论文提出快速路下匝道出口与邻接交叉口衔接部的长度的研究，对改善衔接部的通行能力，减少交通堵塞和交通事故具有一定作用。论文通过对西安市南二环与高新四路交叉口附近衔接部的现场调查，在对获得的大量的实测数据整理、分析的基础上，首先对实测得到的数据进行处理，选择使用正交实验法对Vissim仿真模型的一些重要可控参数进行参数标定，这就确保了模型在本论文所研究区域的适用性和可行性，确保了模型的仿真结果能够符合西安市南二环的实际交通情况，并提出了符合西安市南二环交通情况与习惯的Vissim参数，然后建立了衔接部的Vissim仿真模型，运行模型并输出数据，使用实测数据与仿真输出数据进行对比，使用数理统计的方法对两者进行对比后证明了模型仿真输出数据与实际研究地点测量到的数据是相仿的，，这就证明我们在研究中使用仿真模型代替实际数据是可行的，也是正确的。利用该衔接部仿真模型进行仿真实验，在实验中通过改变输入到模型中的衔接部不同长度和进入衔接部的不同交通量以及其他各种可控交通条件，然后输出运行结果，进而得到了一系列的关于不同衔接部长度的衔接部内交通总流量和衔接部各部分车辆行车速度的有关数据。对输出的数据进行处理与归类后，代入到衔接部速度-流量-密度公式进行计算，最终得到不同长度衔接部内一定交通总流量对应的车流密度，利用SPSS回归分析软件得到不同长度衔接部内车流密度与交通总流量的关系公式，利用归纳总接的衔接部服务水平划分标准，得出不同服务水平衔接部的长度与衔接部交通总流量的折线关系图。在不同服务水平衔接部的长度与衔接部交通总流量的折线关系图上做平行线便能得到需要的衔接部长度。论文研究成果为城市快速路设计规范的修编提供了一定的参考依据，具有较好的实用价值。
[Abstract]:At present, China's large and medium-sized city traffic congestion has become the main problem of city traffic, in order to ease the traffic pressure of the city road network, many city began construction of expressway system, the viaduct and interchange is an important part of the expressway system in our country. The crowded city to city road network density can be increased, the density of the network the larger the city expressway system in the design often will be arranged in the landing ramp exit near the intersection with the expressway overpass adjacent, so the length of the link is often affected by network planning restrictions, also did not consider the length design of the connective part can meet the late traffic capacity and traffic safety needs, resulting in expressway is completed the capacity of the entire road junction has become the bottleneck and the accidents. The expressway ramp exit and adjacent intersection junction length The study has a certain role in improving the capacity of the junction and reducing traffic jams and traffic accidents.
The site of the Xi'an city and the South Second Ring Road intersection near the four high cohesion Department survey, in order to obtain a large number of measured data, based on the analysis, processing of the measured data obtained from the first, choose to use the orthogonal experiment to the Vissim simulation models of some important parameters of the calibration parameters. It ensures the feasibility and applicability of the model in the study area of this paper, to ensure that the simulation results of the model can meet the actual traffic conditions near the south of Xi'an City, and puts forward the traffic situation of Xi'an city with the South Second Ring and Xi Vissim parameters used, and then set up a simulation model of Vissim junction, operation model and output the data were compared with the measured data and simulation output data, using mathematical statistic method for the comparison of the two shows that the model simulation data and actual research point The amount of the data is similar, this proves that we use the simulation model in the study instead of the actual data is feasible, also is correct. The simulation experiment is conducted using the connections of the simulation model, by changing the input to the connections of the model in different length and different traffic into the connecting part and other controllable traffic conditions in the experiment, and then the output result, and then get the relevant data about the different connections of the length of the connecting part of a series of traffic flow and connection of each part of vehicle speed. The output data were processed and classified, into the connections of the speed flow density was calculated, finally the total flow of certain traffic with different length cohesion within the Department of traffic density, regression analysis software with different length of cohesion within the Department of traffic density and traffic flow closed by SPSS Department of formula, using the inductive link part service level division standard total with the convergence of different service level the length of the link and the traffic flow of the total line diagram. Parallel lines in different service levels and the length of the link connections of the total traffic volume of the line diagram can be obtained to link length.
The research results of this paper provide some reference for the revision of urban expressway design specification, and have good practical value.

【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U412.352.1

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