暴雨对快速路速度—密度关系影响的实证分析  

Empirical Analysis of Speed-density Relationships for Urban Expressway under Rainstorm Condition

作　　者：孙洪运[1] 杨金顺[2] 吴兵[1] 

机构地区：[1]同济大学道路与交通工程教育部重点实验室,上海201804 [2]青岛理工大学汽车与交通学院,山东青岛266555

出　　处：《交通运输系统工程与信息》2016年第3期221-227,共7页Journal of Transportation Systems Engineering and Information Technology

摘　　要：研究了暴雨对不同车道数的城市快速路交通运行的影响.首先估算了暴雨下自由流车速、通行能力等关键参数下降幅度;然后利用最小二乘法标定了6种连续型速度—密度模型,最后评价了模型估计关键参数能力和预测车速能力.研究表明:暴雨下路段的自由流车速和通行能力下降幅度、模型估计关键参数能力和预测车速能力都随车道数不同而不同.因此有必要区分暴雨对不同车道数快速路路段的影响.This paper investigates the impacts of rainstorm condition on traffic operation of multi-lane urban expressways. Firstly, reductions in free-flow speed and capacity are calculated. Secondly, six one- regime speed-density models are calibrated by least square method. Finally, best models for key parameter estimation and for operating speed prediction are assessed. Results show that reductions in free-flow speed and capacity, and the abilities to estimate key parameter and to predict operating speed vary with different number of lanes under rainstorm condition. Therefore, it necessitates distinguishing rainstorm＇ s impacts on urban expressway segments with different number of lanes.

关 键 词：交通工程 速度-密度模型 最小二乘法 车道数 自由流车速 通行能力 

分 类 号：U491.2[交通运输工程—交通运输规划与管理]