斜交桥壅水试验研究与理论探讨

通过水工模型试验,对于采用圆形桥墩、河槽没有路堤压缩的情况进行了模拟,分析了斜交桥的最大壅水值随斜交角度、跨度、墩径、宽深比的变化趋势,揭示了斜交桥壅水值变化的内在规律,通过回归分析给出了斜交桥壅水高度修正系数的计算公式。基于斜交桥的水流特点及尾流扩散理论,考虑上游桥墩尾流对下游水流的干扰,下游桥墩的壅水对上游水流的影响,给出桥前壅水的计算公式。

Experimental and theoretical study of skew bridge backwater

For lack of the theoretical calculation method at present,the skew bridge backwater is simulated in adopting circle pier and embank uncompressing river through hydraulic models.With the change of skew angle,the change of backwater is analysis.The model experiment indicates the immanence law of the change of the height of backwater around the skew bridge.The calculation formula for the correct coefficient of the skew bridge backwater height is given through the regress analysis.Considering interaction of piers,the calculation formula for skew bridge backwater height is deduced based on the flow character of the skew bridge and theory of trail flow.