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Parametric study on the trench designing for X80 buried steel pipeline crossing oblique-reverse fault

机译：X80埋藏钢管交叉斜逆故障沟通设计的参数研究

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ABS T R A C T The safety operation of buried long-distance oil and gas pipelines has long been threatened by the active fault movement due to earthquake. In this paper, a three-dimensional numerical model of X80 buried pipeline crossing oblique-reverse fault was established considering the existence of pipeline trench and backfill soil. The values of parameters were derived from the Third West-to-East Natural Gas Transmission Pipeline Project in China. The strain development and deformation features of pipeline for local buckling and tensile fracture were obtained. The influence of various trench design parameters (pipeline burial depth, trench slope inclination, backfill soil type and thickness) on the failure process was discussed. Meanwhile, based on the failure criterion of buried pipelines, the critical fault displacements corresponding to different trench design schemes were studied. It is shown that the failure of pipelines can be avoided by reasonable trench design in the areas of low seismic in-tensity. Finally, the optimal scheme was further given to provide a reference for the seismic design of buried pipelines at oblique-reverse fault crossings.
机译：ABS T R A C T埋入的长距离油和天然气管道的安全操作长期以来受到由于地震引起的积极故障运动受到威胁。本文在考虑管道沟槽和回填土的存在，建立了X80埋地管道交叉倾斜故障的三维数值模型。参数的价值来自于中国的第三西部天然气传输管道项目。获得了局部屈曲和拉伸骨折管道的应变开发和变形特征。讨论了各种沟槽设计参数（管道埋藏深度，沟槽斜坡倾斜，回填土型和厚度）对故障过程的影响。同时，基于埋地管道的故障标准，研究了对应于不同沟槽设计方案的关键故障位移。结果表明，通过在低地震压力的区域的合理沟槽设计中可以避免管道的故障。最后，进一步提供了最佳方案，以提供倾斜反向断层交叉处的埋地管道地震设计的参考。

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