Study on the landslide mechanism, monitoring, and scenario simulation of slate slopes caused by adjacent anticline structure

During extreme rainfall, large-scale landslide is a frequent mishap in mainstream and tributaries of Taiwan. Reviewing the histories of Taiwan landslide events, as a large-scale rock/soil mass of simultaneous movements in mountains roads, villages, valley sides, it might cause serious disasters. Reviewing the present literatures, there are morphological indications that the potential rockslide can be track and find. Especially, the slate slope is influenced by weathering and gravitation for a long time, it become weak and it may cause the sliding slope creep and folding rock that will become the sliding surface of deep-seated rockslide. But analysis of earthquake and rainfall induced rock slope deformation, development of cracks on cliff top, failure for disaster preparedness, and response planning are sometimes inadequate due to the complexity of such slopes. Whereas, this study formulates three years that mainly focus on the failure trend of large-scale landslides for slate (or argillite) slope caused by the adjacent anticline structure. The study area was selected D077 large-scale landslide (The landslide volume is approximately 5.9 million cubic meters) case which to discuss the landslide mechanism, monitoring, and scenario simulation model. Base on the past events of the rockslide, the geological investigation, morphological analysis and remote sensing technology will helpful to induce the geological characteristics and the morphological evolution. Then, calibrated numerical methods adopted in the small-scale model were used to simulate the full-scale model. The scenario simulation results should be as close to reality as much as possible. Finally, D077 large-scale landslide case will be simulated, establishing a landslide scenario simulation model, and the results can provide reference for disaster prevention, mapping and interpretation of monitoring signals with hazard areas, and associated renovation project planning.

Key words: large-scale landslide, slate slope, anticline, monitoring, scenario simulation model.