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: $ 1.46万
• 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: 2010
• 资助国家: 加拿大
• 起止时间: 2010-01-01 至 2011-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=457694
• 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.

埋地管道是将液态烃和天然气产品从油田开发区运输到国内和国际市场的主要方式。管道运输系统的安全、经济和可靠运行是管道运营商和监管机构的首要目标。申请人正在进行的和拟议的管道研究计划的主要目标是开发新的/改进的设计工具，用于承受来自三个不同来源的地面运动的埋地管道。(a)冰凿：很久以前就发现了北极管道海底冰凿的潜在威胁。保护管道免受冰凿影响的一种方法是将管道埋到足够的深度。然而，在模拟冰凿事件和预测安全埋藏深度方面存在重大争议。在拟议的研究中，一个适当的本构模型，可以代表土壤的行为，包括高度剪切区以下和周围的龙骨，将开发和实施有限元算法模拟大位移的土壤。将开发一种估算管道埋深的改进方法。(b)海底斜坡破坏：深水斜坡的潜在破坏可能影响勘探、生产和运输设施。拟议的研究将确定海底斜坡破坏的潜在原因。将采用土工离心机进行物理模拟和数值模拟，以开发一种合理的方法来预测海底斜坡的破坏及其对管道的影响。(c)冷冻气管道下的冻胀：北方管道设计需要一个可靠的设计程序来预测冷冻气管道下的冻胀。在拟议的研究中，将进行离心试验和数值模拟。研究结果将是非常有用的验证的冻结隆起模型，因为全尺寸的测试是昂贵的，并将提供重要的投入，以开发改进的设计方法。该赠款将支持3名硕士和4名博士生的培训。