Study And Analysis of Unstable Slope In Burliar, The Nilgiris-India

Abstract

Landslide is the sudden and rapid downward movement of a mass of rocks or earth on a steep slope. Landslide is one of the major natural hazards that affect most of the area all over the world. In India landslide mostly occurs in hilly terrains of Northern Himalayas and Southern Western and Eastern Ghats. The Nilgiris hills is located at the convergence zone of the Eastern Ghats and the Western Ghats and characterized by a lateritic cap, which is sensitive to over-saturation and highly landslide prone. Rainfall data’s collected from Indian Meteorological Department (IMD). The data’s about the landslide is taken from Geological Survey of India (GSI). Burliar location, which is nearer to foothill of Nilgiris mountain range, is considered for the study and the Slope stability analysis is done. Soil sample were collected and laboratory investigations are carried out to find the Engineering and strength properties of soil. Results show that the soil is classified under SM category. Very fine composed of high silt content over a very deep depth. The soil-rock interface is easily softened by the rainfall which smoothens the surface leads to slope failure. Also the silty soil is easily carried away by even small rainfall which leads to hue downpour of soil around roads and valleys.