A Review on the Effects of Gradation on Shear Strength Characteristics of Compacted Laterite Soil Liner

The engineering properties of laterite soil are affected by the distribution of different grain sizes. It is observed that there are discrepancies in shear strength values in laterite soils from various researches around tropical countries of the world. Therefore, this review discusses the recent researches on the effects of gradation on shear strength properties of compacted laterite soil liner. Shear strength varies from 60 kN/m² to greater than 200 kN/m² relative to fine contents ranging from 1.3% to 69% and coarse contents ranging from 31% to 98.7%. Generally, there is no clear trend established for effects of gradation on shear strength properties of compacted laterite soil liners. It is expected that with the adequate understanding of effects of gradation on shear strength of compacted laterite soil it will become very useful for hydraulic barriers in engineered sanitary landfills in tropical countries around the world.