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.