不均匀沉降条件下车-路相互作用及道路纵面设计分析

发布时间：2018-05-02 21:25

本文选题：道路工程 + 纵面线形设计　；参考：《中国公路学报》2017年04期

【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。
[Abstract]:In order to provide a reference for the longitudinal line design of highway maintenance and reconstruction and extension project, a five-degree-of-freedom vehicle-road interaction analysis model is adopted, and the MATLAB program is compiled according to Newmark- 尾 method. The vehicle vibration acceleration is obtained. According to ISO 2631-1 standard, taking the root mean square value of weighted acceleration as the comfort evaluation index, this paper analyzes the law of vehicle-road interaction, slope length and slope difference under the condition of uneven settlement of staggered platform type, broken line type and exponential type. The influence of vertical plane design index on driving comfort is discussed. Finally, an example of Hangzhou-Ningbo Expressway reconstruction and extension project is analyzed. The results show that under the same conditions, the greater the vehicle speed, the greater the vibration acceleration caused by the uneven settlement of the road, and the lower the driving comfort is with the increase of the height of the staggered platform settlement step, the slope of the broken line and the exponential type of settlement. In order to keep comfortable, the step height of staggered type of high grade highway should not exceed 1 cm, the slope of broken line should not exceed 0.3, the control standard of exponential type should be more strict, and the slope length and slope size do not directly affect the ride comfort. The driving comfort is improved with the decrease of slope difference and the increase of vertical curve radius. When the conditions are limited and the visual distance is satisfied, it is proved that the limit of the minimum slope length of highway route design code can be broken through properly. The longitudinal line design is carried out according to the requirement of driving comfort.
【作者单位】：浙江大学软弱土与环境土工教育部重点实验室;湖南大学土木工程学院;浙江省交通规划设计研究院;
【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)
【分类号】：U412.33

【相似文献】