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<p>In the hydrogeological context of karst mountainous regions, seismic activity exerts a profound influence on the water conduction capacity of compressive faults, which is crucial for comprehensively understanding the stability, deformation characteristics, and failure mechanisms of gentle slopes under the interactions of fault water conduction and pore water pressure. This study surmounts the limitations inherent in traditional methodologies under complex geological conditions by employing an integrated approach comprising various techniques, such as geological surveys, drone photogrammetry, spring water chemical analysis, and InSAR monitoring, to meticulously elucidate the dynamic processes and characteristics associated with slope deformation and failure. Utilizing GeoStudio numerical simulation software, this study modeled the effects of variations in pore water pressure on slope stability, conducting an in-depth analysis of the underlying mechanisms associated with slope deformation and failure. The findings reveal that, in their natural state, the water-conducting capacity of compressive faults is relatively insignificant. Nevertheless, seismic activity and reservoir construction markedly enhance the water-conducting capacity of faults, emerging as pivotal triggers for landslides. Furthermore, extended leakage from water conduits serves as a secondary factor contributing to the deformation and failure of slopes. Time-series InSAR monitoring data further corroborate that slope deformation predominantly occurs in areas exhibiting significant fault water conduction influence, with the rate of deformation closely correlating with seismic activity. The results of numerical simulations demonstrate that the influence of fault water conduction substantially elevates the pore water pressure within the slope, resulting in a 41.1% reduction in slope stability, with the primary failure mechanisms manifesting in two distinct patterns: “right-rotation—creep-sliding—tensile failure” and “pressure-induced uplift and rupture.”</p>

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Coupled Effects of Fault-Related Groundwater Flow and Pore Water Pressure: Unraveling the Mechanisms of Deformation and Failure in Gentle Slopes

  • 期刊论文

  • 发表日期：

    2025年1月16日

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  • Xudong He,
  • Wenbing Shi,
  • Yongdong Zhu,
  • Long Yan,
  • Yunlong Zhao,
  • Song Wang

摘要

In the hydrogeological context of karst mountainous regions, seismic activity exerts a profound influence on the water conduction capacity of compressive faults, which is crucial for comprehensively understanding the stability, deformation characteristics, and failure mechanisms of gentle slopes under the interactions of fault water conduction and pore water pressure. This study surmounts the limitations inherent in traditional methodologies under complex geological conditions by employing an integrated approach comprising various techniques, such as geological surveys, drone photogrammetry, spring water chemical analysis, and InSAR monitoring, to meticulously elucidate the dynamic processes and characteristics associated with slope deformation and failure. Utilizing GeoStudio numerical simulation software, this study modeled the effects of variations in pore water pressure on slope stability, conducting an in-depth analysis of the underlying mechanisms associated with slope deformation and failure. The findings reveal that, in their natural state, the water-conducting capacity of compressive faults is relatively insignificant. Nevertheless, seismic activity and reservoir construction markedly enhance the water-conducting capacity of faults, emerging as pivotal triggers for landslides. Furthermore, extended leakage from water conduits serves as a secondary factor contributing to the deformation and failure of slopes. Time-series InSAR monitoring data further corroborate that slope deformation predominantly occurs in areas exhibiting significant fault water conduction influence, with the rate of deformation closely correlating with seismic activity. The results of numerical simulations demonstrate that the influence of fault water conduction substantially elevates the pore water pressure within the slope, resulting in a 41.1% reduction in slope stability, with the primary failure mechanisms manifesting in two distinct patterns: “right-rotation—creep-sliding—tensile failure” and “pressure-induced uplift and rupture.”