Field Investigation and Finite Element Analysis of Landslide-Triggering Factors of a Cut Slope Composed of Granite Residual Soil: A Case Study of Chongtou Town, Lishui City, China

Landslides caused by excavations and precipitation events are widespread types of slope failures in southwest Zhejiang, China, areas with granite residual soil. Investigations the effect high on hydrological response, stability, evolutionary mechanism cut slopes soil lacking. The characteristics historical landslides Chongtou Town southwestern Zhejiang were summarized, a typical was selected for analysis. hydraulic mechanical properties fully weathered tested, surface displacements monitored. Geo-studio utilized to establish coupled seepage-deformation model validate numerical method investigate landslide-triggering factors slope. results showed nearly all triggered events, slide bodies consisted similar geotechnical properties. simulated measured horizontal good agreement, indicating reliability established parameters. stability coefficient decreased an increase gradient or height critical values 5.3 m, 5.5 5.7 6.0 6.3 m at 60°, 65°, 70°, 75°, 80°, respectively. Long-term torrential rain short-term high-intensity likely trigger when event lasts longer than 26 h 78 h, landslide formation includes four stages: evolution, unloading zone foot, migration loss particles, instability findings can be used prevent manage