| 淤泥质海床管沟自然回填规律研究 |
| Research on the Natural Backfilling Law of Trench on Muddy Seabed |
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| DOI：doi：10.3969/j.issn.1003-2029.2025.05.011 |
| 中文关键词: 海底管道 水槽试验 黏性土体 回淤 管顶覆土厚度 |
| 英文关键词:submarine pipeline flume test viscous soil back silting thickness of soil covering on top of pipe |
| 基金项目:国家自然科学基金资助项目（52171285） |
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| 中文摘要: |
| 海底管道埋填可有效保护管道免受落锚拖锚造成的伤害，管沟开挖后在海流作用下自埋是一种经济有效的埋填方式，但管沟区域黏土沉积规律仍不明晰。为探究淤泥质海床条件下海底管道管沟的自然回填机制，本文结合水槽试验与数值模拟方法，系统分析了流速、土体强度、波浪特征及管沟边坡比等关键因素对回填过程的影响。在Fluent 平台中模拟回填过程，探讨各影响因素对管顶覆土厚度的作用规律。结果表明：波流中含沙量增加有助于提升沟槽回填效率，回填的管顶覆土量与流速、波高周期、管沟边坡比呈正相关关系，且与土体不排水抗剪强度呈负相关关系，研究为提升回填效率及控制管道埋设深度提供了理论依据。 |
| 英文摘要: |
| Submarine pipeline landfilling can effectively protect pipelines from damage caused by anchor drop and dragging. Self-burial under ocean current conditions after trench excavation is an economical and efficient method of landfilling, but the deposition behavior of clay in trench areas remains unclear. To investigate the natural backfilling mechanism of submarine pipeline trenches on muddy seabed, this study combines flume tests and numerical simulations to systematically analyze the influence of key factors such as current velocity, soil strength, wave characteristics, and trench slope ratio on the backfilling process. The backfilling process was simulated using Fluent to explore the effect of these factors on the thickness of soil covering the pipe top. The results show that an increase in sediment concentration under wave-current interaction improves trench backfilling efficiency. The thickness of soil covering the pipe top is positively correlated with current velocity, wave height and period, and trench slope ratio, while negatively correlated with the undrained shear strength of the soil. This study provides a theoretical basis for improving backfilling efficiency and controlling pipeline burial depth. |
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