The effects of slope grade on the soil-pipeline interaction loading

坡度对土-管相互作用荷载的影响

• 批准号: 538221-2019
• 负责人: Maghoul, Pooneh
• 金额: $ 1.82万
• 依托单位: University of Manitoba
• 依托单位国家: 加拿大
• 项目类别: Engage Grants Program
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=681220
• 关键词: effects; slope; grade; soil; pipeline

Northern Crescent Inc. is a pipeline integrity assessment company based in Calgary, Alberta, that provides geohazard assessment services for pipelines. These assessments include analysis of pipe-soil interaction in the geohazard prone areas, and provision of Fitness For Service (FFS) assessments to the oil and gas pipeline industry. Northern Crescent encounters ground movement of various types. The performance of pipes with these ground movement is not well understood. Furthermore, the effect of the slope grade on this geohazard assessment against pipelines has not been considered in the guidelines available in existing design codes/manuals. Through the proposed research project, Northern Crescent will utilize the expertise of Dr. Maghoul and her team to advance the technology for FFS assessment of pipelines subjected to geohazards. In the current industry practice, the FFS assessment of pipelines against ground movement is conducted through numerical modeling, where three orthogonal springs are used to represent the surrounding soil. As it is not feasible to physically model a landslide in a lab, researchers usually bury a pipe in a soil box and drag the pipe in the preferred direction to measure the exerted soil loads on the pipe. The force-displacement curves are used to define the spring stiffness required for the numerical analysis of the pipeline behavior. The force-displacement curves for the soil springs were originally developed assuming that the ground surface is flat. However, when the pipe is buried in a slope, the assumption of flat ground surface might lead to non-conservative results. Therefore, an advanced numerical technique that can take the effect of ground slope into account is required. In this proposed collaborative research project, both physical and numerical modeling techniques will be developed to calculate the effect of the ground slope on the geohazard assessment of pipes, which will lead to an accurate design of pipelines in the landslide areas.

Northern Crescent Inc.是一家位于艾伯塔省卡尔加里的管道完整性评估公司，为管道提供了地质扎华评估服务。这些评估包括分析地质灾害易于区域的管道土壤相互作用，以及为石油和天然气管道行业提供适应性服务（FFS）评估。北部新月会遇到各种类型的地面运动。这些地面运动的管道的性能尚不清楚。此外，在现有的设计法规/手册中可用的指南中尚未考虑坡度等级对该地质扎华评估的影响。通过拟议的研究项目，Northern Crescent将利用Maghoul博士及其团队的专业知识来推进FFS的技术评估，以评估受到Geohazards的管道。在当前的行业实践中，FFS对地面运动的管道评估是通过数值建模进行的，其中三个正交弹簧用于代表周围的土壤。由于在实验室中物理对滑坡进行物理建模是不可行的，因此研究人员通常将管道埋在土壤盒中，然后将管道拖到首选方向上，以测量管道上施加的土壤载荷。力置换曲线用于定义管道行为数值分析所需的弹簧刚度。假设地面是平坦的，则最初开发了土壤弹簧的力置换曲线。但是，当将管道埋在斜坡上时，平坦地面的假设可能会导致非保守结果。因此，需要考虑一种可以考虑地面斜率效果的高级数值技术。在该提出的合作研究项目中，将开发物理和数值建模技术，以计算地面坡度对管道的地球扎华评估的影响，这将导致在滑坡区域中准确设计管道。