Reactivation of a Huge, Deep-Seated, Ancient Landslide: Formation Mechanism, Deformation Characteristics, and Stability

摘要: In this study, an investigation on the formation mechanisms, deformation characteristics, and stability of Outang landslide, composed by three independent blocks (O1, O2, O3), is performed integrating site surveys, multi-technique monitoring data, numerical simulation. The results show that mechanism for O1 O3 slide-bulking, planar slide block O2. These along incompetent layers (ILs): IL1 slip surface IL3 O3. Furthermore, west local fast movement zone might evolve into deep failure. slope step-like, characterized alternation rapid displacement followed imperceptible over each hydrological year. velocities increased upslope. Based simulation, both precipitation reservoir water are believed as major factors driving behaviors, would be decreased gradually under effect periodic variation level seasonal infiltration. As a result some countermeasures landslide long-term recommended.