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DYNAMIC RESPONSES AND SAFETY EVALUATION OF SUSPENDED PIPELINES IMPACTED BY SUBMARINE LANDSLIDES
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摘要: 作为一种常见的海洋地质灾害，海底滑坡会对油气管道的安全造成巨大威胁。由于海洋底流的冲刷作用，海底管道往往会悬跨于海床之上，稳定性较差。当悬跨管道遭受到海底滑坡的冲击作用后，其动态响应预测及安全性评估尤为重要。本文建立了海底滑坡-管道相互作用的有限元模型，将油气管道分为悬跨段和埋地段，考虑了悬跨长度和高度变化条件下，油气管道遭受海底滑坡冲击作用时的动态响应。数值计算结果表明，管道悬跨长度和高度对其塑性变形影响显著，海底滑坡引起的管道应变会随着悬跨长度和高度的增加而增大。最后，提出了综合考虑悬跨长度和高度影响下海底管道安全性评估方法，该成果可直接用于海底滑坡作用下油气管道安全性的动态评估。Abstract: Submarine landslides are a common type of marine geo-disasters and can cause huge threat to the safety of oil and gas pipelines. Due to scour effect of seabed currents, submarine pipelines are usually suspended above the seabed surface, leading to poor pipeline stability. When the suspended pipeline is impacted by the submarine landslide, prediction of pipeline dynamic responses and safety evaluation become especially important. In this study, a finite element model of submarine landslide-pipeline interaction is developed through dividing the pipeline into the suspended and burial sections. The model is capable of capturing dynamic responses of oil and gas pipelines subjected to submarine landslides considering different pipeline spanning lengths and heights. Numerical analyses show that the influence of spanning length and height on the plastic strain of the pipeline is conspicuous. The pipeline strain induced by submarine landslides increases with the increase of spanning length and height. Finally, combing the effect of spanning length and height, a safety evaluation method of suspended pipelines under the impact of submarine landslides is proposed. The results can be directly used for dynamic evaluation of oil and gas pipeline safety under the impact of submarine landslides.
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Key words:
- Submarine landslide /
- Oil and gas pipeline /
- Spanning length /
- Spanning height /
- Pipeline response /
- Safety evaluation
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图 1 海底管道与滑坡相互作用物理模型
a. 三维模型；b. 简化平面应变物理模型
Figure 1. Physical model of submarine pipeline-landslide interaction
图 5 管道最大应变随管道悬跨高度比的变化
Figure 5. Variation of maximum pipe strain with landslide span height ratio
图 7 海底管道安全性评估图
a. Hs/D=0；b. Hs/D=0.5
Figure 7. Illustration of submarine pipeline safety evaluation
表 1 有限元分析所需参数取值
Table 1. Values of required parameters in finite element analysis
参数 取值 管道参数 直径D/m 1 壁厚t/m 0.04 钢材型号 X60 埋深Hc/m 0.5 总长度L/m 3000 悬跨长度Ls/m 600 悬跨高度Hs/m 0 滑坡体参数 宽度B/m 200 速度v/m·s-1 6 密度ρ/kg·m-3 1500 参考剪切强度su，ref/kPa 0.3 参考剪切速率${\dot \gamma } $ref/s-1 1×10-5 指数β 0.13 海床土体参数 不排水剪强度su/kPa 5 
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