Study of Stability of Slope Failure-The Case of Singati Landslide, Dolakha

Abstract

This thesis presents a study of the stability of the slope failure. This study shows the real time interpretation of the slope using the field measured deformation in various season. The possible causes of instabilities are discussed by field visit judgments, field measurement data and results obtained. In this thesis, a method is presented to study the nature, amount and causes of deformation for the understanding of the slope failure and suggesting the mitigating measures. For this the pillars are installed in the study area and the measurements are taken relative to the pillar installation time in dry and wet seasons. The pore water pressure contribution in the deformation are analyzed. The results showed the increase in the deformation rate with increase in the water table of the slope. The models are prepared using the cross section of the study slope and borehole log of core drilling in the study area. FEM software are used to back calculate the model material strength parameters using the field measurement deformation data. The results from the FEM analysis are used to model in LEM and calculate the Factor of Safety value. Mitigation measures are suggested based on the results obtained from LEM. By decreasing the water table the Factor of Safety values increases and other protection measures along with drainage are suggested. The Singati landslide slope is analysed for stability, vertical deformation, porewater pressure and mitigation measures.