不均匀沉降条件下车-路相互作用及道路纵面设计分析  

Analyses of Vehicle-road Interaction Under the Condition of Uneven Settlement and Road Profile Alignment Design

作　　者：陈仁朋[1,2] 贾瑞雨 姜正晖 张海忠 

机构地区：[1]浙江大学软弱土与环境土工教育部重点实验室,浙江杭州310058 [2]湖南大学土木工程学院,湖南长沙410082 [3]浙江省交通规划设计研究院,浙江杭州310006

出　　处：《中国公路学报》2017年第4期1-8,23,共9页China Journal of Highway and Transport

基　　金：国家自然科学基金项目(51225804;U1234204;41472244);浙江省交通运输厅科技计划项目(2014H07)

摘　　要：为了给高速公路大中修养护和改扩建工程纵面线形设计提供参考,采用五自由度车辆-道路相互作用分析模型,以微型车和客车为代表车型,根据Newmark-β法编制MATLAB程序进行求解,获得了车辆振动加速度。根据ISO 2631-1标准,以加权加速度均方根值为舒适性评价指标,分析了错台型、折线型和指数型不均匀沉降条件下车辆-道路的相互作用规律和坡长、坡差、竖曲线半径等道路纵面设计指标对行车舒适性的影响规律,最后结合杭甬高速公路改扩建工程实例进行了分析。研究结果表明:在相同条件下,车辆行驶速度越大,由道路不均匀沉降引起的振动加速度越大;行车舒适性随错台型沉降台阶高度、折线型和指数型沉降坡度的增大而降低,为保持舒适,高等级公路错台型的台阶高度不宜超过1cm,折线型的坡度变化不宜超过0.3%,指数型的控制标准应更严格;坡长和坡度大小并不直接影响行车舒适性,行车舒适性随坡差的减小、竖曲线半径的增大而提高;在改扩建公路工程中,当条件受限时,在满足视距的前提下,经论证,可适当突破公路路线设计规范对最小坡长的限制,按行车舒适性的要求进行纵面线形设计。In order to provide references to vertical alignment design for major and intermediate maintenance and reconstruction and extension of expressways, the vehicle-road interaction analysis model with five degrees of freedom was adopted. With vehicles represented by mini car and bus, the vertical vibration accelerations were obtained by a MATLAB program compiled according to Newmark-β method. In terms of criterion ISO 2631-1, the weighted root-mean- square （RMS） acceleration was adopted as the evaluation index. The laws of vehicle-road interaction under the condition of uneven settlement of step mode, polyline mode and exponential mode were investigated. The influences of road profile design indexes such as slope length, slope difference and radius of vertical curve on driving comfort were analyzed. Finally, a practical case of Hangzhou-Ningbo Expressway extension project was also performed. The results show that the larger the driving speed of vehicle is, the greater the vibration acceleration gains caused by the uneven settlement of road under the same condition. The driving comfort is reduced with the increase of height of step mode and slope of polyline and exponential mode. In order to keep comfort, for high-grade expressways, the height of step mode should not be more than lcm, the slope difference of polyline mode should not be more than 0. 3%, and the control standard of exponential mode should be stricter. Driving comfort is not directly affected by the value of slope and slope length. With the decrease of slope difference and the increase of radius of vertical curve, the driving comfort is improved. When site conditions are limited in road reconstruction and extension project, on the premise of sight distance, after demonstration, the limitation of the most small slope length specified in design specification for expressway alignment can be pushed properly, and vertical alignment can be designed according to requirements of driving comfort.

关 键 词：道路工程 纵面线形设计 车辆-道路相互作用分析模型 不均匀沉降 加权加速度均方根值 

分 类 号：U411[交通运输工程—道路与铁道工程]