| The Cleveland Corral landslide is a slow moving, complex debris slide-debris flow located 2.0 km east of Riverton, California in the Highway 50 landslide corridor. This study was undertaken to identify and characterize geologic factors such as lithologic contacts, foliation, and ground water seepage, which contributed to the accumulation of ground water and ultimately reduced slope stability. The Cleveland Corral landslide consists of three separate sections with unique geologic properties. After significant precipitation ceased, ground water seepage to the lower sections of the slide maintained high pore pressures and a reduced Factor of Safety (FOS). With elevated pore pressures and a reduced FOS, subsequent minor precipitation events initiated slope failures. Once the slide was in motion, ground water seepage sustained or accelerated movement. Results derived from calculations and simple computer models produced FOS values that were in general agreement with field observations and monitoring data. |
