Evaluation of Bearing Capacity on Geosynthetic-Reinforced Soil Structures Considering Multiple Failure Mechanisms

Abstract

This study proposes a limit equilibrium approach to estimating the bearing capacity of strip footings placed on geosynthetic-reinforced soil structures (GRSSs). To assess the multiple mechanisms that may govern the ultimate resistance sustained by GRSSs, logarithmic-spiral, two-part wedge, two-sided general shear, one-sided general shear, and failure above the uppermost geosynthetic layer are proposed. Each of these mechanisms is assessed considering geometry, geotechnical properties, and geosynthetic rupture, whereupon an algorithm selects the minimum, critical bearing capacity and associated failure mechanism for design. Additionally, the effects of foundations placed near the transition between reinforced and unreinforced soil are evaluated. Considering these factors, both the failure mechanism and bearing capacity attained from this analysis are compared with rigorous numerical models, demonstrating agreement. The multimechanism approach is then extended to assess bearing capacity considering various geometric configurations and material properties. Finally, a set of dimensionless charts are presented for convenient assessment of the ultimate bearing capacity of strip footings placed on GRSSs.