Finite Element Analysis for Bearing Capacity of Circular Footing on Geogrid Reinforced Sand

Abstract

Finite element method is used to determine the ultimate bearing capacity of Circular  Footing resting on geogrid reinforced sand. The effect of each of the depth ratio of the topmost layer of geogrid (u/D), the vertical distance ratio between consecutive layers (h/D), number of geogrid layers (N), and the effective depth ratio of reinforcement (d/ D) on the bearing capacity were studied, where (D) is the footing diameter. In addition, for all these parameters, depth of embedment ratio of  footing (D /Df) and the angle of internal friction (φ)on the ultimate bearing capacity were studied as well. In general, the results showed that by increasing the number of reinforcement layers (N), the bearing capacity increased. The optimum value of  reinforcement layers was (N=3-5). The optimum depth ratio of the topmost layer geogrid was between (0.25D-0.3D-0.35D) depending on the angle of internal friction (30°,35°,40°) respectively. The optimum vertical distance ratio between consecutive layers was between (0.325D-0.35D),(0.225D-0.25D) and (0.3D-0.375D). As a result, the optimum effective depth ratio of reinforcement was between (0.95D-1.55D), (0.8D-1.2D) and (0.95D-1.1D) depending on the angle of internal friction (30°,35°,40°) respectively. Also, the depth of embedment ratio of footing was (0D,0.25D,0.5D) respectively.
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