| 臧志鹏,滕斌,程亮.水流作用下海底管线三维冲刷扩展速度实验研究[J].,2009,(1):110-114 |
| 水流作用下海底管线三维冲刷扩展速度实验研究 |
| Experimental research on propagation velocity of 3-D scour of pipelines on sea floor under action of currents |
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| DOI：10.7511/dllgxb200901021 |
| 中文关键词: 海底管线 三维冲刷 扩展速度 稳态水流 |
| 英文关键词: pipeline on sea floor 3-D scour propagation velocity steady current |
| 基金项目:国家杰出青年科学基金-海外青年学者合作研究基金资助项目(50428908). |
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| 中文摘要: |
| 对水流作用下海底管线三维冲刷问题进行了实验室研究，重点研究了不同的水流速度(以底面剪切力系数 θ 表示， θ =0.046~0.104)、管线埋厚比( e/D =0.1~0.5)、水流作用角( α =45°~90°)下的冲刷沿管线扩展速度．实验结果表明管线下方冲刷以先后两个速度沿管线向两侧扩展．建立起冲刷段扩展速度 v h与 θ、e/D、α 等影响因素间的关系．发现管线冲刷的扩展速度随底面剪切力系数的增大而增大；随着埋厚比的增大而减小，随水流作用角的增大而增大．最后，根据实验结果建立了一套预测海底管线下方冲刷段扩展过程的经验模型，效果较好． |
| 英文摘要: |
| The 3-D scour of pipelines on sea floor in steady current is investigated by experiments. The major emphasis of the investigation is on the scour propagation velocities along the pipeline at different flow speeds (in term of Sheilds parameter θ, θ =0.046-0.104), embedment depth ( e/D =0.1-0.5) and attacking angle of flow ( α =45°-90°). It can be concluded that scour propagates along the pipeline at two constant rates after initiation. The relationship between propagation velocity v h and some flow parameters including θ e/D and α are founded. Scour propagation velocities generally increase with the increase of Shields parameter and attacking angle, but decrease with the increase of the pipeline embedment depth. An experiential equation is proposed to predict the propagation of 3-D scour of pipelines on sea floor in steady current and validated against the experimental results. And both results are in good agreement. |
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