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A refined nonlinear analytical method for buried pipelines crossing strike-slip faults

机译：一种埋设管道交叉防滑断层的精致非线性分析方法

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摘要

This paper presents a novel nonlinear governing equation and solution procedure for analyzing a buried pipeline at an active strike-slip fault crossing. The proposed method includes exact nonlinear axial and nonlinear transverse soil-pipe interaction terms, in addition to geometrical nonlinearity terms in the governing equation. The assumption of partitioning the pipeline into four segments with four governing equations based on the soil yield threshold is removed, and a unified governing equation is introduced. Compared with existing methods, the proposed method has a significantly extended application range with improved accuracy and provides the advantage of including the sliding of buried pipelines within soil, transverse soil spring plasticity, and improved large-deformation effects including the sliding effect. The solution procedure is improved by removing the optimization steps and external calculations. The proposed method is verified by comparison to a verified finite element-based model with various fault displacements and angles, and the results are in excellent quantitative and qualitative agreement with the numerical results, even for cases of large fault movement. Finally, criteria for assessing the ovalization damage of buried pipelines are proposed. The proposed method fulfills the missed part of literature, and it is valuable for (1) verification of the nonlinear FEM analysis; (2) fast, economic, and reliable stability analysis and design of buried pipelines; and (3) a strong tool for future developments of buried pipelines seismic design guidelines.
机译：本文介绍了一种新型非线性控制方程和解决方案程序，用于分析主动击球故障交叉处的埋地管道。该方法包括精确的非线性轴向和非线性横向土管道相互作用，除了控制方程中的几何非线性术语之外。去除将管道分成四个区段的假设除去了基于土壤屈服阈值的四个控制方程，并引入了统一的控制方程。与现有方法相比，该方法具有显着扩展的应用范围，具有改善的精度，并提供了包括土壤，横向污水弹簧可塑性的埋地管道的滑动和改善包括滑动效果的大变形效应的优点。通过去除优化步骤和外部计算来提高解决方案过程。通过与具有各种故障位移和角度的验证的有限元的模型进行验证所提出的方法，并且结果与数值结果良好的定量和定性协议，即使对于大故障运动的情况。最后，提出了评估埋地管道卵形化损伤的标准。该方法符合文献的错过部分，它对（1）验证非线性有限元分析有价值; （2）埋设管道快速，经济，可靠的稳定性分析和设计; （3）埋藏管道地震设计指南的未来发展的强大工具。

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