Modeling of buried pipelines subjected to ground movement

受地面运动影响的埋地管道建模

• 批准号: 326955-2010
• 负责人: Hawlader, Bipul
• 金额: $ 1.82万
• 依托单位: Memorial University of Newfoundland
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2013
• 资助国家: 加拿大
• 起止时间: 2013-01-01 至 2014-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=526754
• 关键词: Modeling; buried; pipelines; subjected; ground

Buried pipelines are the prime mode of transportation of liquid hydrocarbon and natural gas products from field development areas to domestic and international markets. Safe, economic and reliable operation of pipeline transportation systems is the primary goal of the pipeline operators and regulatory agencies. The main objectives of applicant's ongoing and proposed research programs on pipelines are the development of new/improved design tools for buried pipelines subjected to ground movement from three different sources. (a) ICE GOUGING: The potential threat of seabed ice gouging on Arctic pipelines was identified a long time ago. One method to protect pipelines from ice gouging effects is to bury the pipelines to a sufficient depth. However, there is a significant controversy in modeling ice gouging events and in predicting safe burial depth. In the proposed research, an appropriate constitutive model that can represent the soil behavior properly, including the highly sheared zones below and around the keel, will be developed and implemented in Finite Element algorithm for modeling large displacement of soil. An improved method of estimating burial depth of pipelines will be developed. (b) SUBMARINE SLOPE FAILURE: The potential failure of deepwater slopes could affect exploration, production and transportation facilities. The proposed research will identify the potential causes of submarine slope failure. Physical modeling using geotechnical centrifuge and numerical modeling will be performed to develop a rational method for predicting the failure of submarine slopes and its effects on pipelines. (c) FROST HEAVE UNDER CHILLED GAS PIPELINES: A reliable design procedure for predicting frost-heave under chilled gas pipelines is required for northern pipeline design. In the proposed research, centrifuge tests and numerical modeling will be performed. The findings will be very useful for the verification of frost heave models, as full-scale tests are expensive, and will provide significant inputs to develop improved design methods. The grant will support training of 3 Master's and 4 Doctoral students.

埋藏的管道是从现场开发区到国内和国际市场的液态烃和天然气产品运输的主要方式。管道运输系统的安全，经济和可靠的运行是管道运营商和监管机构的主要目标。申请人正在进行和拟议的管道研究计划的主要目标是开发新/改进的设计工具，用于从三种不同来源的地面移动的埋入管道。 （a）冰淇淋：很久以前发现了北极管道上海底冰的潜在威胁。一种保护管道免受冰淇淋效果的方法是将管道埋入足够的深度。但是，在建模冰淇淋事件和预测安全的埋葬深度方面存在重大争议。在拟议的研究中，将在有限元算法中开发和实施一个适当代表土壤行为的适当组成型模型，包括高于龙骨下方和龙骨周围的高度剪切区域，用于建模土壤的大量位移。将开发一种改进的估计管道埋葬深度的方法。 （b）海底斜坡故障：深水坡度的潜在失败可能会影响勘探，生产和运输设施。拟议的研究将确定潜在的海底斜率故障原因。将使用岩土离心机和数值建模进行物理建模，以开发一种有理方法，以预测海底斜率的失败及其对管道的影响。 （c）冰冷的气管管道下的霜冻大量：一种可靠的设计程序，用于预测北部管道设计的冰冻气管冰管下的霜冻。在拟议的研究中，将进行离心测试和数值建模。这些发现对于验证霜冻模型将非常有用，因为全尺度测试很昂贵，并且将提供重要的投入来开发改进的设计方法。该赠款将支持对3名硕士和4位博士生的培训。