高速公路互通立交小半径匝道雨雪天事故风险与限速研究  

Research on Accident Risk and Speed Limit of Small Radius Ramp of Expressway Interchange in Rainy and Snowy Days

作　　者：陈正委 张杰 徐进[1] CHEN Zheng-wei;ZHANG Jie;XU Jin(School of Traffic&Transportation,Chongqing Jiaotong University,Chongqing 40o074,China;Datang Gaohong Zhilian Technology(Chongqing)Co.Ltd.,Chongqing 401331,China)

机构地区：[1]重庆交通大学交通运输学院,重庆市400074 [2]大唐高鸿智联科技(重庆)有限公司,重庆市401331

出　　处：《公路》2023年第4期217-225,共9页Highway

基　　金：国家自然科学基金面上项目,项目编号52172340;大唐高鸿智联科技项目,项目编号DTGH-ITS-2021176;重庆市高校创新研究群体项目,CXQT21022。

摘　　要：为了探究车辆通过小半径匝道横向失稳形成机制及横向失稳车辆的临界特征,以重庆境内石渝高速(龙桥互通—丰都东互通段)的8处互通立交小半径匝道作为研究对象,运用Carsim/Trucksim软件探究车辆在不同匝道道路条件下的临界速度,并分别建立小客车和货车的临界速度计算模型,最后结合模型提出车路协同的动态限速方案。研究结果表明:车辆横向偏移量波动较大时极易发生侧滑;建立的临界速度计算模型对于小半径匝道的临界速度计算具有较高的可靠性;货车临界速度具有饱和现象,即当道路摩擦系数大于0.55时货车的临界速度将不再明显变化;道路摩擦系数小于0.45时货车的临界条件为侧滑,当道路摩擦系数在0.45~0.55之间时货车的临界条件会由侧滑转变为倾斜;车路协同动态限速方案能够在不同天气条件下进行限速,并能控制限速差值在30 km/h以内。In order to explore the formation mechanism of lateral instability of vehicles passing through small radius ramps and the critical characteristics of laterally unstable vehicles,in this paper 8 interchange small radius ramps of Shi(Shizhu)-Yu(Chongqing)Expressway(the Longqiao Interchange to Fengdu East Interchange Section)in Chongqing are taken as the research object,the CarSim/Trucksim software is used to explore the critical speed of vehicles under different ramp road conditions,and the critical speed calculation models of passenger cars and trucks are established respectively.Finally,combined with the models,a dynamic speed limit scheme of vehicle-road coordination is proposed.The results show that when the vehicle lateral offset fluctuates greatly,side slip is very easy to occur;the critical speed calculation model established has high reliability for the critical speed calculation of small radius ramps;the critical speed of truck has saturation phenomenon,that is,when the road friction coefficient is greater than O.55,the critical speed of truck will not change significantly;and when the road friction coefficient is less than O.45,the critical condition of the truck is side slip.When the road friction coefficient is between O.45-0.55,the critical condition of the truck will change from side slip to inclination.The vehicle road cooperative dynamic speed limit scheme can limit the speed under different weather conditions and control the speed limit difference within 30 km/h.

关 键 词：交通工程 小半径匝道 Carsim/Trucksim仿真 临界速度计算模型 临界条件 车路协同限速 

分 类 号：U491.254[交通运输工程—交通运输规划与管理]