- Design of Geosynthetic-Reinforced Soil Structures (GRSS) require sufficient rear pullout anchoring capacity in order to maintain internal stability. Length requirements are amplified when reinforcement coverage ratios or seismicity is considered, potentially resulting in uneconomical GRSS design lengths. This study describes the influence of reinforcement length, coverage ratio, and pseudostatic seismic thrust on internal stability – i.e. mobilization of maximum reinforcement tension (Tmax) and connection loading (Tconn) – as affected by rear pullout capacity. The top-down limit equilibrium (LE) method is used to assess reinforcement loading, internal stability, and the locus of Tmax. The influence of rear anchoring on internal stability conditions is discussed, demonstrating if requisite rear reinforcement pullout capacity can be achieved under low coverage ratios or under seismic thrust, albeit at the expense of significant reinforcement tensions. The results demonstrate that with sufficient rear anchoring, it is possible to achieve adequate internal stability with shorter reinforcement lengths and lower coverage ratios under a range of static and seismic conditions.
Key Words: Geosynthetic Reinforced Soil Structures, Internal Stability, GRSS, Slope Stability