| 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。 |
| 关键词: 桥墩 局部冲刷 流量 防冲指标 主成分分析 多级防冲结构 |
| DOI： |
| 分类号:Ｕ４４３.２２ |
| 基金项目: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） |
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| Experimental studies on structure optimization of ring-wing scour plates under different discharges |
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WANG Zuo, MOU Xian-you, LI Chun-jiang, TIAN Jian-hao
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College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University
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| Abstract: |
| To carry out studies of the local scour around the bridge piers under different discharges, a multi-level structure is formed by increasing anti-scouring plates in addition to a single anti-scouring plate. A principal component analysis is made of anti-scouring indexes by multivariate statistical methods. It has proved the maximum pit depths have a great reflection of experiment results. In addition, the experiment results are analysed using the maximum pit depths. The analysis results show that the anti-scouring effect can′t be improved by increasing the anti-scouring plates at 75 m3/h, but it can be increased at 115 m3/h. Besides, the anti-scouring effect increases with decrease of the spacings between the anti-scouring plates, and enhances with increase of the outer diameters of the anti-scouring plates. However, the anti-scouring effect of three-level anti-scouring plates is similar to that of the two-level anti-scouring plates. The third-level anti-scouring plate has little effect on the experiment results. Therefore, under the conditions of different discharges, the optimal structure of the ring-wing anti-scouring plates will be two slices of the anti-scouring plates. The outer diameter of the anti-scouring plates is 180 mm, and the spacing between the anti-scouring plates is 15 mm. |
| Key words: bridge piers local scour different discharge anti-scouring indexes principal component analysis multi-level anti-scouring structure |
