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<p>Mountainous slope-aligned natural gas pipelines are highly susceptible to rainfall-induced geological hazards such as landslides, debris flows, and erosion, which pose significant threats to their structural safety and stability. This study investigates a slope-aligned pipeline in a gas reservoir in Dazhou, Sichuan Province. Initial stress testing was conducted using the indentation method, and a safety evaluation framework was established. Based on the ABAQUS finite element model was developed to simulate the effects of varying rainfall intensities and durations on pipeline stress, deformation, and slope safety factors under three conditions: undisturbed soil, backfill soil, and integrated soil and water conservation measures. The results show that increasing rainfall intensity and duration significantly aggravate pipeline displacement and stress concentration, while also reducing slope stability. Although undisturbed and backfill soils offer limited protection under low-intensity rainfall, their effectiveness diminishes under heavy and prolonged rainfall. In contrast, integrated soil and water conservation measures consistently reduce pipeline stress and deformation while improving slope stability under all rainfall conditions. These findings underscore the importance of prioritizing integrated protection strategies in mountainous pipeline projects to mitigate rainfall-induced stability risks. The proposed approach has been successfully applied in engineering practice, demonstrating its effectiveness and providing a scientific basis for optimizing protection strategies in similar terrains.</p>

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Study on Initial Stress and Selection of Soil and Water Conservation Measures for Mountain Pipelines

  • 期刊论文

  • 发表日期：

    2025年11月1日

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  • Xuesong Huang,
  • Yifan Chen,
  • Yanhui Ren,
  • Yulong Zheng,
  • Yucong Zhou,
  • Bolin Jia,
  • Yujia Li,
  • Tao Ren

摘要

Mountainous slope-aligned natural gas pipelines are highly susceptible to rainfall-induced geological hazards such as landslides, debris flows, and erosion, which pose significant threats to their structural safety and stability. This study investigates a slope-aligned pipeline in a gas reservoir in Dazhou, Sichuan Province. Initial stress testing was conducted using the indentation method, and a safety evaluation framework was established. Based on the ABAQUS finite element model was developed to simulate the effects of varying rainfall intensities and durations on pipeline stress, deformation, and slope safety factors under three conditions: undisturbed soil, backfill soil, and integrated soil and water conservation measures. The results show that increasing rainfall intensity and duration significantly aggravate pipeline displacement and stress concentration, while also reducing slope stability. Although undisturbed and backfill soils offer limited protection under low-intensity rainfall, their effectiveness diminishes under heavy and prolonged rainfall. In contrast, integrated soil and water conservation measures consistently reduce pipeline stress and deformation while improving slope stability under all rainfall conditions. These findings underscore the importance of prioritizing integrated protection strategies in mountainous pipeline projects to mitigate rainfall-induced stability risks. The proposed approach has been successfully applied in engineering practice, demonstrating its effectiveness and providing a scientific basis for optimizing protection strategies in similar terrains.