山区公路弯坡组合路段设计指标研究  

Research on the design index for slope-curve section of mountain highway

作　　者：岳雷[1] 姚红云[2] 王慧 YUE Lei;YAO Hongyun;WANG Hui(Key Laboratory of Road and Traffic Engineering,Ministry of Education,Tongji University,Shanghai 201804,China;College of Traffic and Transportation,Chongqing Jiaotong University,Chongqing 400074,China;College of Civil Engineering,Chongqing University,Chongqing 400045,China)

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]重庆交通大学交通运输学院,重庆400074 [3]重庆大学土木工程学院,重庆400045

出　　处：《中国矿业大学学报》2019年第3期520-528,共9页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(51008321);中央高校基本科研业务费专项项目(106112017CDJXY200006)

摘　　要：针对现有规范中对山区公路弯坡组合路段设计指标协调性考虑不足的问题,本文以车辆行驶稳定性分析为基础,建立了长下坡路段、急弯路段以及长下坡接急弯路段的车辆行驶安全模型.采用运行车速预测模型作为弯坡组合路段前后线形单元设计指标协调性判别依据,分析比较了设计车速、大小车型、超高及坡长对设计指标阈值的影响及变化规律.结果表明:后线形单元急弯的最小半径与设计速度成正比,与弯道超高及前线形单元的坡度成反比,但在设计车速较小时,前线形单元坡度变化对后线形单元最小半径影响不明显.在考虑实际运行车速的情况下,后线形单元计算最小半径均大于现有规范最小半径.最后,利用Carsim仿真试验验证了理论分析结果.The coordinated design of slope-curve section is neglected in the existing design specifications for mountain highway. Driving safety models for long slope section, sharp curve section and combination of slope and curve section were established based on driving stability analysis. The operating speed prediction model was used as the coordination design indicator of the front and rear unit of slope-curve section. The effects of design speed, vehicle type, super-elevation and slope length on the threshold of design index were analyzed and compared. The result show that: the minimum radius of the sharp curve of the rear alignment unit is proportional to the design speed, and inverse to the super-elevation of the curve and the slope of the front alignment unit. However, when the design speed is low, the influence of slope on the minimum radius of the rear alignment unit is little. The minimum radius of the rear alignment unit calculated with the actual operating speed is larger than the minimum value according to the existing specification. Finally, the theoretical analysis results were verified by Carsim simulation experiments.

关 键 词：交通工程 山区公路 协调设计 长下坡接急弯 

分 类 号：U412.3[交通运输工程—道路与铁道工程]