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<p>Landslides triggered by high gas pressure represent a distinct geotechnical hazard, especially in scenarios without significant rainfall. Recent studies have revealed that high-pressure gas accumulation within slopes can be a dominant trigger for large-scale failures although the processes behind this remain not well understood. This study examines how unsaturated soil slopes fail under high gas pressure using a combination of laboratory experiments and numerical simulations. A key discovery is that gas pressure changes slope stability by redistributing pore fluids and altering effective stress, with distinct depth-dependent effects. Moreover, a novel concept of critical stable gas pressure (<i>P</i><sub><i>ac</i></sub>) is proposed as a practical threshold for stability assessment, which is depth-dependent, with extreme values at shallow and intermediate depths, reflecting the interplay between gas diffusion and overburden resistance. This study advances the mechanistic understanding of gas-induced slope instability and offers actionable benchmarks for managing related risks in engineering projects including waste landfill management and shale gas operations.</p>

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Dynamic stability analysis of unsaturated slopes triggered by high gas pressure: Critical pressure threshold and progressive failure evolution

  • 期刊论文

  • 发表日期：

    2025年8月6日

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  • Maohong Yao,
  • Tielin Chen,
  • Yin Song,
  • Weifeng Zhang,
  • Xiangfeng Wang,
  • Xinfu Xing

摘要

Landslides triggered by high gas pressure represent a distinct geotechnical hazard, especially in scenarios without significant rainfall. Recent studies have revealed that high-pressure gas accumulation within slopes can be a dominant trigger for large-scale failures although the processes behind this remain not well understood. This study examines how unsaturated soil slopes fail under high gas pressure using a combination of laboratory experiments and numerical simulations. A key discovery is that gas pressure changes slope stability by redistributing pore fluids and altering effective stress, with distinct depth-dependent effects. Moreover, a novel concept of critical stable gas pressure (Pac) is proposed as a practical threshold for stability assessment, which is depth-dependent, with extreme values at shallow and intermediate depths, reflecting the interplay between gas diffusion and overburden resistance. This study advances the mechanistic understanding of gas-induced slope instability and offers actionable benchmarks for managing related risks in engineering projects including waste landfill management and shale gas operations.