The present research compares the performance of marginal backfill with clean granular soil using numerical analysis. Poor drainage and low shear strength and development of pore water pressure due to presence of fines are major design constraints in using marginal soil as the GRS wall backfill. Marginal soil can be defined as the percentage fines greater than fifteen percent or having plasticity index more than 6. However, due to lack of availability, transportation issues, granular soil is not abundant in many of highway project site. Over the years, granular soil has been predominantly used as the backfill material owing to its high strength, good drainage characteristics and easily compactable. This paper is to investigate the performance of geosynthetic reinforced soil (earth) wall, popularly known as GRS walls, backfilled with the marginal soil.
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