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考虑水流路径长度的S型曲线超高段纵坡研究

DOI: 10.3969/j.issn.1674-0696.2013.04.11, PP. 594-596

Keywords: S型曲线,超高,缓和曲线,纵坡,水流路径长度,Scurve,super-elevation,transitioncurve,longitudinalslope,flowpathlength

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Abstract:

:?雨天公路S型曲线超高缓和路段易形成积水,影响行车安全。以力学为基础,运用有限差分,建立了超高渐变段的水流路径长度与纵坡的关系模型;考虑车辆发生滑水的危险状态,得到水流路径控制长度。以公路单路拱S型曲线为研究对象,对3组不同车道数和7种不同纵坡工况下的±2%超高渐变段的水流路径长度进行分析。结果表明:纵坡由0.5%增加到6%,水流路径长度平均增大2.83倍,纵坡越大,水流路径越长;当纵坡大于4%时,不同车道的水流路径都超过了限定值。以水流路径长度为控制指标,给出了不同车道数S型曲线平缓超高路段最大纵坡建议值。

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