Bulletin of the Geological Society of Malaysia, Volume 20, August 1986, pp. 819 – 826
School of Civil and Structural Engineering, Nanyang Technological Institute, Upper Jurong Road, Singapore 2263
Abstract: Slope stability problems in residual soils and weathered rocks are described. These are related to periods of high rainfall, though no precise relationship between slope instability and rainfall has been established. Saturation of the near surface zone during prolonged periods of rainfall is offered as the main trigger of slope failure, saturation of the toe area being considered especially significant. This is considered in the light of infiltration rates, throughflow, permeability and rainfall characteristics. Long-term destabilisation of the slopes following regrading, stress relief and shear creep is offered as a possible mechanism causing the slope instability.