The present research focuses on improvement of various soil properties and strength parameters of clayey subgrade using geogrid (biaxial) and geotextile (nonwoven) placed through various reinforcement systems viz. Single layer reinforcement system (SIL), composite layer reinforcement system (COL), multi layer reinforcement system(ML) at various position/levels of subgrade thickness. A high strength geotextile and a biaxial geogrid are used as geosynthetic reinforcement materials in this study. Soaked and Unsoaked CBR tests were performed on expansive soil (CI and CH soil) using above mentioned reinforcement systems. The main objective of this study is to know the most efficient geosynthetic reinforcement system and position of reinforcement for medium expansive soil (CI) and highly expansive soil (CH) of Gujarat region.. Given results depicts that infusion of geosynthetic reinforcement at various levels of subgrade note only improves CBR value but overall its increases the structural stability of the subgrade. Out of various subgrade systems composite reinforced system at position of h/5 gave the maximum CBR value and its calibration with modulus of subgrade reaction (K) was quite compatible.

subgrade, geosynthetics, reinforcements, expansive soils, CBR value