The occurrence of landslide may be resulted from inherent unstable geological structure, rainfall, groundwater fluctuation, earthquake, Montrnorillonites,and erosion.In order to investigate landslide failure mechanism of Lichi Formation, the DA-PO hillslope area was selected as an experimental sites. For instrumentations, boring exploration, inclinometer, extensometer,strain gauge and ground water indicator were installed to collect the required data. The instrumentation project was performed for one-year duration and the observations were employed for the analysis.
