Large-deformation finite element analysis of pipe penetration and large-amplitude lateral displacement
Large-deformation finite element analysis of pipe penetration and large-amplitude lateral displacement
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DOI：
10.1139/t09-147
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发表时间：
2010-07
影响因子：
3.6
通讯作者：
Dong Wang;D. White;M. Randolph
中科院分区：
文献类型：
--
作者：
Dong Wang;D. White;M. Randolph
海底管道的设计必须适应热膨胀--通常通过控制横向屈曲来实现--并抵抗海底滑坡造成的损坏。在这两种情况下，管道横向移动了一段很长的距离，管道的整体响应受到横向管土阻力的强烈影响。本文采用大变形有限元法，结合软化率相关的土体模型，研究了管道的贯入和侧向位移过程。计算的土壤流动机制，管道阻力，和轨迹同意与塑性解决方案和离心试验数据。结果表明，沉管过程中土体的隆起和沉管过程中管道前方形成的护道对管道的侧向阻力有很大的影响。对于“轻型”管道，管道上升到土壤表面，土壤破坏机制包括在护堤底部滑动。相比之下，“重”管向下俯冲，形成一个深剪切带。
Seabed pipelines must be designed to accommodate thermal expansion — which is commonly achieved through controlled lateral buckling — and to resist damage from submarine slides. In both cases, the pipe moves laterally by a significant distance and the overall pipeline response is strongly influenced by the lateral pipe–soil resistance. Here, the process of pipe penetration and lateral displacement is investigated using a large-deformation finite element method, with a softening rate–dependent soil model being incorporated. The calculated soil flow mechanisms, pipe resistances, and trajectories agree well with plasticity solutions and centrifuge test data. It was found that the lateral resistance is strongly influenced by soil heave during penetration and the berm formed ahead of the pipe during lateral displacement. For “light” pipes, the pipe rises to the soil surface and the soil failure mechanism involves sliding at the base of the berm. In contrast, “heavy” pipes dive downwards and a deep shearing zon...