【作者】 李岩；

【导师】 刘海旭；

【作者基本信息】 西南交通大学 ， 交通运输工程， 2014， 硕士

【摘要】 环形交叉口作为道路平面交叉口的一种特殊形式,通过在中央设置中心岛,使车辆可以连续有序地进入交叉口,并逆时针绕岛行驶。具有冲突点少、安全性高且美化城市的优点。但随着城市交通流量的不断增加,环形交叉口逐渐成为了城市网络拥堵的瓶颈。对于这一问题,目前主要采用设置停车让行、设置信号灯和拆掉环岛改成信号交叉口或者改成立体交叉的方式等,然而设置停车标志的效果有限,采用后两种方法往往要花费大量的投资和维修费用,如果采用的方法不合理往往不能彻底的解决交通问题或者资金的浪费,在拆除环岛的过程中还会造成对市容市貌的不良影响,因此对环形交叉口进行微观仿真研究,就显得尤为重要。本文从建立符合实际运行状态的微观仿真模型为出发点,利用VISSIM仿真软件对环形交叉口的微观仿真进行了研究。本文主要内容包含以下几个部分：1.介绍了环形交叉口特征,分析了环形交叉口内不同区域的车辆运行行为,并对我国环形交叉口的车辆运行特点进行了总结。2.介绍了利用VISSIM建立环形交叉口仿真模型的方法,分析了从数据调查、路网建立和路网测试的具体建模过程,并结合环形交叉口的车辆运行特性指出了提高建模准确性需要注意的问题。3.利用相关性分析,对显著影响环形交叉口运行状态的驾驶员行为参数进行了选取。采用遗传算法,利用Visual C++编程语言编写遗传算法程序,通过VISSIM的COM接口实现Visual C++对VISSIM的调用,再以MFC构建系统的框架,建立了环形交叉口的参数校正系统。4.选取位于成都市新都区的蜀龙转盘环形交叉口,利用本文介绍的建模方法和本文设计的参数校正系统对其进行了实际的建模仿真和参数校正,并应用校正后的模型测算了该交叉口的实际通行能力,最后验证了计算结果的合理性。更多还原

【Abstract】 Roundabouts is a special form of the intersection. By setting the central island in the center of roundabouts, the vehicle can be ordered into a continuous intersection and traveling counter-clockwise around the island. The Roundabouts not only has less conflict points which makes them much safer but also can beautify the city.With the increasing urban traffic, roundabouts have become the congestion bottleneck of urban network. In order to solve this problem, setting stop-line and traffic lights, changing the roundabouts into Intersection with signal or Grade separation are the two main methods that currently used. The former one has limited effect while the latter has massive costs of construction and maintenance and a potential impact of cities’ appearance. Therefore, the Micro-simulation of Roundabouts is particularly important. In order to establish the micro-simulation model in line with the actual running state, this thesis use VISSIM to simulate the roundabouts. The main contents are as follows:(1) This thesis introduces the characteristics of roundabouts, analyzes the behavior of the vehicle running in different regions of the roundabout, and summarizes our roundabouts vehicle running characteristics.(2) This thesis introduces a method to establish simulation models roundabout by VISSIM, analyzes the specific network modeling process, including survey data, road network establishment and road network testing. In addition, it points out the issues that should pay attention to in order to improve the accuracy of the modeling.(3)Using correlation analysis, this thesis selects the parameters about significantly affecting roundabout’s running state. Furthermore, it writes genetic algorithm programs by Visual C++programming language, and achieves Visual C++’s call to VISSIM by VISSIM’s COM interface. Finally, this thesis establishes a roundabout parameter correction system by a framework based on MFC.(4)This thesis selects a roundabout located on Shulong turntable in Xindu. By the method of modeling and parameter calibration system designed in this thesis, actual intersection of simulation and modeling parameters were corrected. This thesis calculates the capacity of the roundabout by using the corrected model, and finally, it verifes the reasonableness of calculated results.更多还原