高速公路部分苜蓿叶型立交环形匝道事故形成机理与防治  

Accident Formation Mechanism and Prevention at Ring Ramp of Part Cloverleaf Interchange in Expressway

作　　者：王思棋 窦同乐 徐进[1,2] WANG Si-qi;DOU Tong-le;XU Jin(School of Traffic&Transportation,Chongqing Jiaotong University,Chongqing 400074,China;Chongqing Key Laboratory of“Human-Vehicle-Road”Cooperation and Safety for Mountain Complex Environment,Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]重庆交通大学交通运输学院,重庆400041 [2]山区复杂道路环境“人-车-路”协同与安全重庆市重点实验室,重庆400074

出　　处：《科学技术与工程》2022年第11期4572-4580,共9页Science Technology and Engineering

基　　金：国家自然科学基金(51678099)。

摘　　要：事故调查数据发现红花湾枢纽互通在小半径匝道上发生的事故率显著高于其他位置的事故率,车辆经常撞击曲线外侧波形梁护栏并偶有货车发生侧翻。为研究此处事故的形成原因,使用车辆动力学软件CarSim和TruckSim进行不同仿真工况的试验分析,得到了小半径匝道上车辆侧滑、侧翻的影响因素以及事故的形成机理。研究结果表明:①小客车行驶速度对小半径匝道的行驶稳定性、侧向偏移量及驾驶员舒适性有显著影响,当匝道半径值为60~65 m时,为保证弯道上的驾驶安全性与舒适性,车速应不超过50 km/h;②为了保证行驶安全性,应在小半径匝道圆曲线之前的长直线段设置减速标线,并保障缓和曲长度;③车速越大,路面附着系数越小,车辆的侧滑情况越严重,为减少侧滑风险,应在该立交匝道上增设彩色防滑路面以提高路面附着系数;④货车以限速值40 km/h入弯时,轮胎载荷转移率最小,轮胎载荷转移率随道路超高和路面附着系数的增大而减小,随载重量和质心高度的增大而增大。According to the accident investigation data,the accident rate of honghuawan hub interchange on the small radius ramp is significantly higher than that of other locations.Vehicles often collide with the waveform beam guard rails outside the curve and occasionally the truck rolls over.In order to study the cause of the accident here,the vehicle dynamics software CarSim and TruckSim were used to conduct experimental analysis under different simulation conditions,and the influencing factors of vehicle side slip and rollover on the small radius ramp and the formation mechanism of the accident were obtained.The research results show these as follows.The driving speed of the small passenger car has a significant effect on the driving stability of the small radius ramp,and the lateral offset and driver comfort are significant.When the ramp radius value is 60~65 m,in order to ensure the safety and comfort of the curve sex,the speed should not exceed 50 km/h.In order to ensure driving safety,the long line segment should be set to the long line segment before the radius ramp curve,and the length of the sliding track is guaranteed.The larger the speed,the road surface The smaller the adhesion coefficient,the more serious the side slip of the vehicle,and the color anti-skid pavement should be added to the vertical turnover to improve the pavement attachment coefficient in this vertical turn.When the speed limit value is 40 km/h,the tire load transfer rate is the smallest.The tire load transfer rate decreases with the increase of road superelevation and road adhesion coefficient,and increases with the increase of load and center of mass height.

关 键 词：交通安全 立交匝道 动力学仿真 路面附着系数 侧滑 侧翻 

分 类 号：U412[交通运输工程—道路与铁道工程]