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公路黄土坝式路堤汛限水位研究

, PP. 11-19

Keywords: 道路工程,黄土坝式路堤,极限概率法,蓄水位,汛限水位,淤地坝

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Abstract:

?为解决公路黄土坝式路堤涵洞泄洪力偏大问题,引入水利中的汛限水位至路堤设计中,针对路堤跨越V形冲沟的上游几何及地质边界条件建立库区模型,按照库水补充损失特点建立补充损失模式,利用极限概率方法得出极限和路堤所属的中间工况,利用渗流力学、蒸发理论得到无放水条件下的蓄水位算式,并根据调研和实测选取的路堤参数进行水位计算,结合有关文献、路堤实际使用和设计情况对计算结果进行分析.分析结果表明:不考虑泥沙影响和路堤高度限制,正常年降雨入库水量条件下,不放水的黄土坝式路堤具有上限的蓄水位,即上限的理想均值水位和上限的高水位;上限水位存在的规律与蓄水年限没有关系,仅与库区的较小年入库来水补充量、蒸发和渗漏引起的较大库水损失量、上大下小库型特点有关;将上限高水位视同于路堤汛限水位的作法能初步改进涵洞泄洪力设计;确定得出坝式路堤的汛限水位是解决涵洞泄洪力偏大问题的关键.

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