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Time development of scour around pile groups in tidal currents

机译：潮流中群桩周围冲刷的时间发展

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摘要

Local scour around pile foundations is a major factor affecting the foundation stability in ocean engineering. A series of experiments has been conducted to study the time development of scour around pile groups under the unidirectional and tidal currents. 49 cylindrical model piles were arranged in a typical dumbbell-shaped configuration, and 20 micro-cameras as well as a 3D laser scanner were used to capture the local scour topography. In the unidirectional current test, the scour pit was spoon-shaped, and the maximum scour depth was located in the central part of upstream pile group. In the tidal tests, two similar shallow scour pits existed in the upstream and downstream pile group. During the initial stage of tide-induced local scour, the increase of scour depth was similar to that under unidirectional current. But, the repetitive scour and backfill process led to obvious fluctuations of scour depth, especially for the piles at the rear of upstream pile group and in the front of downstream pile group. It was found that the tidal cycle number had obvious effect on the scour depth development. The final scour depth after sufficient tidal cycles could reach up to 77.1% of the maximum scour depth under unidirectional current.
机译：桩基周围的局部冲刷是影响海洋工程中地基稳定性的主要因素。已经进行了一系列实验来研究单向和潮流作用下桩群周围冲刷的时间发展。以典型的哑铃形状配置了49个圆柱模型桩，并使用20台微型摄像机以及3D激光扫描仪来捕获局部冲刷地形。在单向电流试验中，冲刷坑呈勺状，最大冲刷深度位于上游桩组的中央。在潮汐试验中，在上游和下游桩组中存在两个类似的浅冲刷坑。在潮汐引起的局部冲刷的初始阶段，冲刷深度的增加与单向电流作用下的相似。但是，重复的冲刷和回填过程导致冲刷深度明显波动，尤其是对于上游桩组后部和下游桩组前部的桩。研究发现，潮汐周期数对冲刷深度发展有明显影响。经过足够的潮汐循环后，最终冲刷深度可能达到单向电流下最大冲刷深度的77.1％。

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  • 来源
    《Ocean Engineering》 |2018年第1期|400-418|共19页
  • 作者

    Ma Lili; Wang Lizhong; Guo Zhen; Jiang Hongyi; Gao Yangyang;

  • 作者单位

    Zhejiang Univ, Key Lab Offshore Geotech & Mat Zhejiang Prov, Coll Civil Engn & Architecture, Hangzhou 310058, Zhejiang, Peoples R China;

    Zhejiang Univ, Key Lab Offshore Geotech & Mat Zhejiang Prov, Coll Civil Engn & Architecture, Hangzhou 310058, Zhejiang, Peoples R China;

    Zhejiang Univ, Key Lab Offshore Geotech & Mat Zhejiang Prov, Coll Civil Engn & Architecture, Hangzhou 310058, Zhejiang, Peoples R China;

    Univ Western Australia, Sch Civil Environm & Min Engn, 35 Stirling Highway, Crawley, WA 6009, Australia;

    Zhejiang Univ, Ocean Coll, Zhoushan 316021, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Unidirectional current; Tidal current; Local scour; Pile group; Camera monitoring; Laser scanner;

    机译：单向电流潮流局部冲刷桩组摄像机监控激光扫描仪;

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