ABSTRACT
This study verified a slip safety factor evaluation method, as developed subsequent to equivalent linear analysis, for the existing rock slope subject to earthquake ground motion records of the 2011 Tohoku earthquake off the Pacific coast of Japan. Results demonstrated that, although a large deformation was not confirmed via slope measurements taken after the earthquake, the minimum slip safety factor was determined to be lower than 1.0. Therefore, it was found that a certain margin is included in the slip safety factor evaluation method. Next, for the purpose of developing a more practical seismic stability evaluation method, the slip safety factor was calculated based on seismic response analysis in the time domain while taking into account the stress redistribution. The analysis revealed the results to be consistent with the existing rock slope.
