| 雷继超, 苏子昂, 李芬, 李志鹏.内外双筒结构对软基上井口吸力锚复合承载力影响分析[J].海洋工程,2025,(6):67~80 |
| 内外双筒结构对软基上井口吸力锚复合承载力影响分析 |
| Analysis of influence of inner and outer double-barrel structure on composite bearing capacity of wellhead suction anchor on soft foundation |
| 投稿时间：2024-09-23 |
| DOI：10.16483/j.issn.1005-9865.2025.06.007 |
| 中文关键词: 井口吸力锚 软土地基 破坏包络线 桶形基础 复合承载特性 |
| 英文关键词:wellhead suction anchor soft soil foundation failure envelope bucket foundation composite bearing characteristic |
| 基金项目:海南省科技计划三亚崖州湾科技城联合项目（2021JJLH0088）；水利工程仿真与安全国家重点实验室开放基金项目（HESS-2105） |
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| 中文摘要: |
不同于传统吸力锚结构，井口吸力锚是一种应用于水合物开采的新型双筒结构基础形式。已有吸力锚承载特性的研究常针对单桶或多桶基础的单筒结构形式，其荷载形式与结构形式与双筒结构存在差异，不适用双筒结构基础的承载力分析。少数关于双筒结构的研究，也只关注单向加载情况对其承载特性的影响。因此针对井口吸力锚在竖向V、水平向H和弯矩方向M加载条件下的复合承载特性开展研究。考虑了复合加载下井口吸力锚破坏包络线关于埋深、内外径比、土体抗剪强度不均匀指数、竖向荷载对极限荷载的比例的变化规律，并通过拟合得到破坏包络面的简化计算模型。结果表明：井口吸力锚的承载性能随埋深和土体抗剪强度不均匀指数的增大有不同程度的增大；内外径比2r/D![]() ![]() 在0.062 5到0.500 0的变化过程中对其承载能力影响较小；而改变竖向荷载对极限荷载的比例V/Vult![]() ![]() 分别为0，0.50，0.75时，其H-M复合承载性能逐渐减弱，且减弱幅度逐渐增大。同时对相同尺寸的井口吸力锚基础、实心圆形基础、桶形基础于复合加载下的承载性能进行对比：井口吸力锚基础弱于实心圆形基础，优于桶形基础，随着深海软土抗剪强度不均匀指数增大，这种差距会随之减小。 |
| 英文摘要: |
| Unlike conventional suction anchor structures, the wellhead suction anchor is a new type of double-barrel foundation designed for hydrate exploitation. Existing studies on suction anchor bearing characteristics mostly focus on single-barrel or multi-barrel monocular structures, whose loading and structural forms differ from double-barrel designs, rendering them unsuitable for analyzing the bearing capacity of such foundations. The limited research on double-barrel structures mainly addresses unidirectional loading effects. Therefore, the combined bearing characteristics of the wellhead suction anchor under vertical V, horizontal H and bending moment M loading conditions are studied. The evolution of the failure envelope with respect to burial depth, inner-to-outer diameter ratio, soil shear strength non-uniformity index, and the vertical-to-ultimate load ratio is examined. A simplified computational model of the failure surface is also proposed through fitting. Results indicate that the bearing performance of the wellhead suction anchor improves with increasing burial depth and soil shear strength non-uniformity index. Variations in the inner-to-outer diameter ratio from 0.062 5 to 0.500 0 have limited effect on bearing capacity. When the ratio of vertical load to ultimate load is changed from 0 to 0.75, the H-M combined bearing capacity decreases progressively, with an accelerating rate of degradation. Additionally, a comparative analysis of wellhead suction anchor, solid circular, and bucket foundations of identical dimensions under combined loading shows that the wellhead suction anchor performs better than the bucket foundation but is inferior to the solid circular foundation. This performance gap narrows as the soft soil shear strength non-uniformity index increases. |
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