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青藏公路运行速度特性研究

, PP. 13-18

Keywords: 道路工程,青藏公路,统计分析,运行速度,公路几何线形,海拔

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Abstract:

?在分析青藏公路不同海拔典型路段实测速度数据的基础上,利用分车型的自由流速度累积曲线,分析得出青藏公路平直线路段、小半径平曲线路段和纵坡路段的运行速度及其变化规律,并分析了海拔对运行速度的影响。结果表明:平直线路段车辆在无路侧干扰条件下能达到期望速度;小半径平曲线路段运行速度变化剧烈;海拔4km为海拔对运行速度的影响临界点,且纵坡对车辆上坡方向运行速度的影响明显大于低海拔地区;青藏公路特殊环境下的运行速度特性研究结论,可为运行速度设计方法和公路项目安全性评价奠定良好的应用基础。

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