复杂多因素共同作用下的海底管道稳定性研究

项目名称： 复杂多因素共同作用下的海底管道稳定性研究

项目编号： No.51479025

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 其他

项目作者： 程亮

作者单位： 大连理工大学

项目金额： 82万元

中文摘要： 海底管道的在位稳定性是进行海洋油气安全输运的重要保障，其稳定性受到海洋环境条件、泥沙输运过程、管道自身以及海床的动力响应等众多因素的影响，并且这些因素之间还存在复杂的耦合作用，共同决定了管道的稳定性。但是，现有的海底管道稳定性设计和评价方法往往过分强调某单一因素的作用，对管道失稳的产生机理和潜在的失稳-再稳定动态发展过程缺乏深刻认识。本项目将通过试验和三维流固耦合数值分析，综合研究海底管道稳定性控制因素的耦合作用过程及其内在机制，并充分认识各因素对管道稳定性的双重影响作用。包括水流、波浪以及波流联合作用下，管道局部冲刷与自沉回填、泥沙运动与底床液化之间既相互促进又相互制约的耦合作用机理，及其对管道稳定性的动态影响作用；在此基础上，提出新型管道稳定性保护措施，并对其潜在的积极和消极作用进行综合研究和分析，形成客观认识，为海底管道的稳定性设计和安全防护提供科学依据和可靠方法。

中文关键词： 海底管道；在位稳定性；泥沙运动；物理试验；数值模拟

英文摘要： The on-bottom stability of subsea pipelines is of critical importance for the transportation of oil and gas product in offshore engineering. The stability of subsea pipelines is affected by the Metocean condition, sediment transport, seabed mobility and pipeline parameters (diameter, specific gravity and roughness). The complex interaction between seabed, pipeline and flow determines the on-bottom stability. However the current design guideline is over conservative in the on-bottom stability design aspect. A clear understanding about the mechanism of pipeline losing stability on mobile seabed is still missing. Present project aims at conducting physical model tests to investigate the on-bottom stability of subsea pipeline and to understand the fundamental mechanism of pipeline stability. The proposed work will provide a comprehensive understanding about both positive and negative effect of seabed mobility on pipeline stability. The investigation will focus on the following aspect, 1), local scour, self-lowering and back-filling process around a pipeline under various flow conditions (current, wave and combined current and wave condition); 2), the interaction between sediment transport and soil liquefaction and its effect to pipeline stability. Based on the research, new measures for improving pipeline stability will be proposed. Comprehensive investigation and analysis about the effect of the new measures will be carried out. It will provide scientific method and reliable guideline to the on-bottom stability design of subsea pipelines.

英文关键词： Submarine pipeline;On-bottom stability;Sediment transportation;Physical test;Numerical simulation