Analytical solutions for safety performance of bell-spigot jointed ductile iron pipelines under various normal fault-pipe crossing positions

IF 6.7 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Tunnelling and Underground Space Technology Pub Date : 2025-03-02 DOI:10.1016/j.tust.2025.106507

Qingshu Chen , Xiaogang Qin , Pengpeng Ni , Mingge Ye , Jianfeng Li

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Abstract

Safety assessment of ductile iron (DI) pipelines under fault rupture is a crucial aspect for underground pipeline design. Previous studies delved into the response of DI pipelines to strike-slip faults, but all existing theoretical methods for DI pipelines under strike-slip faults are not suitable for normal fault conditions due to the difference in soil resistance distribution. In this study, analytical solutions considering asymmetric soil resistance and pipe deflection are developed to analyze the behavior of DI pipelines under normal faulting. Results indicate that DI pipelines with a longer segment length are more vulnerable to pipe bending damage, while exhibiting a lower sensitivity to joint rotation failure. For the conditions of pipe segment length L = 1.5 m at all burial depths and L = 3 m at a shallow burial depth, when the fault-pipe crossing position shifts from a joint to a quarter of the segment length (rp = 0 ∼ 0.25), DI pipelines are more prone to joint rotation failure. However, in the cases of L = 3 m at a moderate to deep burial depth and L = 6 m at all burial depths, the most unfavorable position is rp = 0.75, dominated by the mode of pipe bending failure.

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球墨铸铁（DI）管道在断层破裂下的安全评估是地下管道设计的一个重要方面。以往的研究深入探讨了球墨铸铁管道对走向滑动断层的响应，但由于土壤阻力分布的差异，所有现有的理论方法都不适用于正常断层条件下的球墨铸铁管道。本研究开发了考虑非对称土壤阻力和管道挠度的分析方案，以分析正常断层下 DI 管道的行为。结果表明，管段长度较长的 DI 管道更容易受到管道弯曲破坏的影响，而对接头旋转破坏的敏感性较低。在所有埋深的管段长度 L = 1.5 米和浅埋深的管段长度 L = 3 米的条件下，当断层-管道交叉位置从一个接头移动到管段长度的四分之一（rp = 0 ∼ 0.25）时，DI 管道更容易发生接头旋转破坏。然而，在中深埋深度的 L = 3 m 和所有埋深的 L = 6 m 的情况下，最不利的位置是 rp = 0.75，以管道弯曲破坏模式为主。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Tunnelling and Underground Space Technology 工程技术-工程：土木

CiteScore

11.90

自引率

18.80%

发文量

454

审稿时长

10.8 months

期刊介绍： Tunnelling and Underground Space Technology is an international journal which publishes authoritative articles encompassing the development of innovative uses of underground space and the results of high quality research into improved, more cost-effective techniques for the planning, geo-investigation, design, construction, operation and maintenance of underground and earth-sheltered structures. The journal provides an effective vehicle for the improved worldwide exchange of information on developments in underground technology - and the experience gained from its use - and is strongly committed to publishing papers on the interdisciplinary aspects of creating, planning, and regulating underground space.