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An analytical procedure for modelling pipeline-landslide interaction in gas pipelines
Gas Science and Engineering ( IF 5.285 ) Pub Date : 2020-09-01 , DOI: 10.1016/j.jngse.2020.103474
Umer Zahid , Alberto Godio , Stefano Mauro

Abstract Landslide occurrence is a major consequence of seismic activity in uphill ground conditions. There effects range from minor damage to severe malfunctioning of local infrastructure. Particularly for transport systems such as underground gas transmission pipelines, the nature of landslide phenomenon is usually catastrophic, thereby necessitating a detailed design analysis for ensuring structural integrity. Numerous research studies have addressed these specific considerations, facilitated substantially by the advent of numerical software simulation. However, relevance of theoretical analysis and their application is still considered significant. This research study aims to determine the limiting axial strains of an underground gas pipeline subjected to longitudinal landslide movement. A novel mathematical formulation is first developed, giving due consideration to the pipeline-soil interaction, internal pressure, weight and temperature loads. Numerical simulation study through COMSOL Multiphysics software is then conducted for the same given conditions. Percentage error of around 6% was observed between the results obtained from both approaches. The proposed analytical methodology was further validated through sensitivity analysis involving slope angle variation. For different slope angles, percentage error between software and analytically computed results varied between 4% and 6%. Effects of changes in pipeline material, soil cohesive strengths and temperature gradient on underlying strains and loads contribution profile were also investigated through the sensitivity analysis study. For the achieved results, compliance with American Lifeline Alliance code was ensured and achieved for both tensile and compressive strain domains.

中文翻译:

一种模拟天然气管道中管道滑坡相互作用的分析程序

摘要 滑坡的发生是上坡地面条件下地震活动的主要后果。其影响范围从轻微损坏到当地基础设施严重故障。特别是对于地下输气管道等运输系统,滑坡现象的性质通常是灾难性的,因此需要进行详细的设计分析以确保结构的完整性。许多研究已经解决了这些具体的考虑,数值软件模拟的出现大大促进了这一点。然而,理论分析及其应用的相关性仍然被认为是重要的。本研究旨在确定受纵向滑坡运动影响的地下天然气管道的极限轴向应变。首次开发了一种新的数学公式,适当考虑管道-土壤相互作用、内部压力、重量和温度载荷。然后通过 COMSOL Multiphysics 软件对相同的给定条件进行数值模拟研究。从两种方法获得的结果之间观察到大约 6% 的百分比误差。通过涉及倾斜角变化的敏感性分析进一步验证了所提出的分析方法。对于不同的倾斜角度,软件和分析计算结果之间的百分比误差在 4% 到 6% 之间变化。还通过敏感性分析研究了管道材料、土壤内聚强度和温度梯度的变化对底层应变和载荷贡献剖面的影响。对于取得的成绩,
更新日期:2020-09-01
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