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高速公路隧道出入口过渡段的合理长度

, PP. 17-23

Keywords: 道路工程,隧道洞口,过渡段长度,侧向余宽,参数估计

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Abstract:

分析了隧道内外侧向宽度值的相关规定,在实测的基础上研究了车辆在隧道出入口运行速度和侧向余宽变化,建立了速度和侧向余宽变化与过渡段长度之间的关系,提出了过渡段合理过渡时间及渐变率。结合数理统计中大样本参数区间估计计算理论,通过对断面速度和断面侧向余宽值的统计推断,提出了隧道出入口过渡段长度的计算方法,得出隧道出口的过渡段长度要比入口的过渡段长度要短,隧道入口段的过渡段长度受线形指标影响较大,而出口段则受影响较小。建议过渡段的渐变率区间宜保持为1/75,1/35,为有效检验隧道出入口交通安全设施设置的合理性提供了定量分析手段。

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