Abstract
Landslide is one of the major hazards in hilly regions especially when we talk about Indian Himalayan mountain ranges. Colluvial soil obtained at base of hill slope is generally week and unconsolidated which need improvement to reuse. Here work is done to improve shear strength of weak Colluvial soil of Kotropi landslide, Himachal Pradesh. This colluvial soil can be used again in various engineering work after adding certain material in it. Although various additives are available but rice husk ash and micro silica powder is selected for partial replacement of soil due to its economic, social and environmental benefits. Soil tests are conducted to get different Geotechnical properties of soil. Various samples of soil are made by adding different percentage of additives. Shear strength of different sample is compared to find optimum proportion of additives. It is observed that 15% of rice husk ash and 4% of micro silica powder provide maximum strength.
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