不同流量下环翼型防冲板结构优化试验

发布时间：2018-06-02 05:13

本文选题：桥墩 + 局部冲刷　；参考：《水利水运工程学报》2015年02期

【摘要】：为了研究不同流量条件下桥墩局部冲刷问题,在单片挡板基础上,增加防冲板数量形成了多级防冲结构。利用多元统计方法对防冲效果进行了主成分分析,认为最大冲坑深度最能体现试验效果,并以最大冲坑深度为指标进行试验分析。试验结果表明:在流量为75 m3/h时,增加防冲板数量并不能有效提升防冲效果;当流量增加到115 m3/h时,通过增加防冲板数量可在一定程度上提高桥墩的防冲能力,并且防冲效果随着防冲板间距的减小而增强,同时随着防冲板外径的增大而增强。但三级防冲板与二级防冲板防冲效果非常相近,第三级挡板对试验的结果影响甚微。因此,试验分析认为,在考虑不同流量条件下,环翼型防冲板最优防冲结构为两片防冲板,且防冲板外径为180 mm,间距取值为15 mm。
[Abstract]:In order to study the problem of local scour of bridge piers under different flow conditions, a multi-stage anti-scour structure was formed by increasing the number of anti-scour plates on the basis of a single baffle. Based on the principal component analysis of the anti-scour effect by multivariate statistical method, it is considered that the maximum depth of the scour pit can best reflect the test effect, and the maximum depth of the scour pit is taken as the index for the test analysis. The experimental results show that when the flow rate is 75 m3 / h, increasing the number of anti-punching plates can not effectively improve the anti-scour effect, and when the flow rate is increased to 115m3 / h, the anti-scour ability of bridge piers can be improved to a certain extent by increasing the number of anti-punching plates. And the anti-impact effect increases with the decrease of the spacing of the anti-punching plate and the increase of the outer diameter of the anti-punching plate. However, the effect of the third stage plate is very close to that of the second class plate, and the third stage baffle has little effect on the test results. Therefore, the experimental analysis shows that the optimal anti-flushing structure of annular airfoil is two anti-punching plates with an external diameter of 180 mm and a spacing of 15 mm. considering different flow rates.
【作者单位】：内蒙古农业大学水利与土木建筑工程学院;
【基金】：国家自然科学基金资助项目(51369022) 内蒙古自治区自然科学基金资助项目(2013MS0719)
【分类号】：U442.32

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