波浪和水流联合作用下双桩局部冲刷的物理模拟

2019/12/18   下载量： 1 次

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应用领域 交通
检测样本 其他
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参考标准 暂无

采用LaVison公司的粒子成像测速系统(PIV)，对波浪和水流联合作用下双桩局部冲刷的流场进行了实验测量。

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Under the actions of ocean waves and current, severe local scour can be induced around pile groups, significantly compromising the safety of marine structures. A series of flume tests were conducted for physical modelling the local scouring process around twin piles in the cohesionless soils under combined waves and currents, and compared with the pure current case. The effects of non-dimensional pile spacing (G/D) and flow skew angle (α) on the scour depth and time scale of scour around twin piles are intensively examined. The experimental observations indicate that the influence of pile spacing on the scour depth development is much more significant for the side-by-side (α=90ο) arrangement than that for the tandem arrangement (α=0°). With the increase of flow skew angle α, the maximum scour depth is remarkably enhanced within the examined range 0 G/D 3.0. When G/D=3.0, the pile group effect on the time scale is generally negligible for pure current cases, whereas a prominent pile-group effect can still be observed for combined wave-current cases, especially for the side-by-side arrangement. A parameter of "equivalent pile diameter" is then introduced for evaluating the maximum scour depth at the twin piles with the previous formulas for the single pile. Based on the existing and present experimental data, the empirical formula of dimensionless equivalent pile diameter as the function of G/D and α is established to predict the maximum scour depth at the twin piles.

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北京欧兰科技发展有限公司
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