Effect of the interfacial shearing stress of soil–geogrid interaction on the bearing capacity of geogrid-reinforced sand

A transformed approach has been made to predict the impression of inclusion geogrid on the reinforced soil’s bearing capacity underneath the strip foundation. The influence of the friction factor of the tensile strength of the reinforcement element performs a significant purpose in estimating the tolerance of the strengthened soil. Analytical study and experimental tests have been performed to validate the proposed empirical approach. This study analyzed certain parameters that influence the efficiency of the strip footing placed on reinforced soil, such as effects of two geogrid layers, the efficacy of geogrid embedment depths, the distance between geogrid layers, the tensile strength of geogrid, the contact surface friction angle, and shear stress distribution along the interactions at the soil–geogrid interface. Consequently, a simple new equation was proposed to modify the reinforced soil’s increased bearing capacity, then a comparative study was executed by the analytical method of literature. Finally, the calculations confirmed a good agreement between laboratory and analytical results such that the error rate was less than 2%. It was found that the value of strain-induced at the midpoint of geogrid decreases with depth, and their magnitude is constant at a 0.5B embedment depth. The impact of geogrid with length ratio (L/B = 5–7) on the strain values has similar behavior, but it is a significant effect of shorter geogrid length layers.