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<p>Fragmented rock masses, with their complex structures and reduced strength, pose significant challenges for slope stability, particularly in the context of anthropogenic disturbances. This study investigates the evolution of an excavation-induced landslide within a fragmented rock slope situated in the upper Lancang River valley, China. Through comprehensive field investigations and analysis of monitoring data, we characterized the slope’s deformation patterns during excavation. To elucidate the dynamic failure mechanisms leading to the formation of a high-velocity debris flow, we employed a novel coupled finite-discrete element method framework. This framework incorporates the extrinsic cohesive zone mode to accurately capture the progressive fragmentation of the rock mass under excavation-induced stress changes. Our simulations reveal a four-stage failure process: (1) sliding initiation, (2) downslope disintegration, (3) debris flow propagation, and (4) deposition. The FDEM approach effectively captures the transition from initial instability to rapid debris flow formation, highlighting its potential as a valuable tool for assessing and mitigating landslide hazards in complex geological settings.</p>

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A Case Study of Anthropogenic Landslide Evolution in a Fragmented Rock Slope

  • 期刊论文

  • 发表日期：

    2025年12月18日

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  • Ming Li,
  • Hui Deng,
  • Chenglong Yang

摘要

Fragmented rock masses, with their complex structures and reduced strength, pose significant challenges for slope stability, particularly in the context of anthropogenic disturbances. This study investigates the evolution of an excavation-induced landslide within a fragmented rock slope situated in the upper Lancang River valley, China. Through comprehensive field investigations and analysis of monitoring data, we characterized the slope’s deformation patterns during excavation. To elucidate the dynamic failure mechanisms leading to the formation of a high-velocity debris flow, we employed a novel coupled finite-discrete element method framework. This framework incorporates the extrinsic cohesive zone mode to accurately capture the progressive fragmentation of the rock mass under excavation-induced stress changes. Our simulations reveal a four-stage failure process: (1) sliding initiation, (2) downslope disintegration, (3) debris flow propagation, and (4) deposition. The FDEM approach effectively captures the transition from initial instability to rapid debris flow formation, highlighting its potential as a valuable tool for assessing and mitigating landslide hazards in complex geological settings.