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单向流作用下土工管袋防护技术研究
Geopipe bag protection under unidirectional flow
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- DOI:
- 10.3969/j.issn.1001-2206.2025.S.014
- 作者:
- 杨光
YANG Guang
- 作者单位:
- 中国石化胜利油田海洋采油厂, 山东东营 257200
Sinopec Shengli Oilfield Offshore Oil Production Plant, Dongying 257200, China
- 关键词:
- 管道冲刷; 数值模拟; 土工管袋; 管袋宽度
pipeline scouring;numerical simulation;geopipe bag;pipe bag width
- 摘要:
- 海底管道周围的局部冲刷是导致管道损坏和失效的主要原因。以埕岛海域某管道为例，重点研究单向流作用下海底管道的冲刷及土工管袋的防护效果。通过简化波流共同作用，利用Flow-3D数值模拟软件，对不同流速和不同管径下海底管道在无防护下的冲刷坑和冲刷深度进行模拟。结果表明，管道前方的冲刷程度明显大于后方，且管道后方存在明显泥沙淤积；冲刷深度随流速增大而增加，相同流速条件下，管径越大，冲刷深度越大。针对上述冲刷特征，提出一种新型土工管袋防护方案，并进一步分析了不同管袋宽度下的防护效果，数值模拟结果表明，土工管袋两侧均会形成淤积，且左侧淤积深度明显大于右侧；管袋宽度越小，其两侧淤积现象越明显；为保证土工管袋在初始状态下的稳定性，建议实际工程中选用宽度为5 m的土工管袋。
Local scouring around submarine pipelines is the main cause of pipeline damage and failure. In this paper, the submarine pipeline scouring under unidirectional flow and the protective effect of geopipe bags were investigated with a pipeline in the Chengdao sea area as an example. By simplifying the combined actions of waves and currents, the scouring pits and scouring depths of the submarine pipeline under different flow rates and pipe diameters without protection were simulated using Flow-3D numerical simulation software. According to the result, the scouring in front of the pipeline is obviously larger than that behind the pipeline, and obvious sediment deposition occurs behind the pipeline. The scouring depth increases with a higher flow rate. With the same flow rate, the scouring depth gets higher with a larger pipe diameter. Based on the scouring characteristics, a new geopipe bag protection scheme was proposed and the protection effect was analyzed under different pipe bag widths. The numerical simulation results show that deposition occurs on both sides of the geopipe bag, and the one on the left side is significantly higher in depth. The smaller width of the pipe bag leads to more obvious sediment deposition. To ensure the stability of the geopipe bag in the initial state, it is recommended to use a pipe bag with a width of 5 m.