Effect of Geogrid Reinforcement on Hyperbolic Stress Strain Behavior of Sand: An Experimental Investigation

This paper studies the effect of geogrid reinforcement on the hyperbolic stress-strain behavior of sand. A comprehensive set of laboratory triaxial compression tests was carried out on dry sand with and without geogrid. The layer configurations used are two, four and six horizontal reinforcing layers in a triaxial test sample. The influences of the number of geogrid layers and confining pressure on sample were studied and described. The results show that the hyperbolic equation (Kondner, 1963) can be used to represent the stressstrain relationship of both unreinforced and reinforced sand. It was also observed that the inclusion of geogrid increases the peak strength, axial strain at failure and hyperbolic parameters. Bulging between layers of reinforcement was observed.