Clear-Water Scour at Pile Groups
Clear-Water Scour at Pile Groups
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DOI：
10.1061/(asce)hy.1943-7900.0000770
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发表时间：
2013-10
影响因子：
2.4
通讯作者：
Rui Lança;C. Fael;R. Maia;J. P. Pêgo;A. Cardoso
中科院分区：
文献类型：
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作者：
Rui Lança;C. Fael;R. Maia;J. P. Pêgo;A. Cardoso
群桩基础是桥梁基础中常用的基础形式。不同的群桩结构，其桩间距、桩斜角、桩数和桩柱布置方式对流场的影响不同，导致不同的冲刷形态和平衡冲刷深度。过去有许多关于群桩冲刷特性的研究，但大多数都是短时间冲刷试验。先验地，这种短的持续时间可能被假定为固有地携带重要的不确定性到现有的冲刷预测。在这项研究中，在接近沉积物运动启动阈值的稳定清水水流下进行了75个长期实验室试验，以解决时间、桩间距、倾斜角和群桩数量对平衡的影响。冲刷深度。桩群由四排一列、两列或三列的矩阵排列组成，间距为1、2、3、4.5和6桩径;测试的倾斜角为1.5 °。
AbstractGroups of piles are frequently used as bridge foundations. Different group configurations, characterized by different pile spacing, skew-angle, number, and arrangement of pile group columns interact differently with the flow field and lead to different scour patterns and equilibrium scour depth. There have been a number of past studies on the characterization of scouring at pile groups, but most of them report short duration scour experiments. A priori, such short durations may be postulated to inherently carry important uncertainties into existing scour predictors. In this study, 75 long-duration laboratory tests were run under steady, clear-water flow close to the threshold for initiation of sediment motion, to address the effect of time, pile spacing, skew-angle and number of pile group columns on the equilibrium scour depth. Pile groups consisted of matrical arrangements of one, two, or three columns of four rows, with spacings of 1, 2, 3, 4.5, and 6 pile diameters; the tested skew-angles were...