The design of basal reinforced embankment is usually carried out by considering “short-term” strength for the soft soil, i.e., without considering increase in strength due to consolidation, associated with “long-term” strength for the reinforcement, which includes creep and other reduction factors. The force mobilized in reinforcement is based on the effective length of reinforcement (length in the stable zone) and the bond between the fill and the reinforcement. The tensile force in the geosynthetic layer at the base of the embankment is considered as horizontal and it contributes to the resisting moment. But, for rotational failure, the sliding mass of soil intersects the reinforcement obliquely causing the reinforcement to deform obliquely. The transverse force due to downward pull of reinforcement increases the normal stresses and contributes to additional tensile force in the reinforcement. In this paper, the stability of basal reinforced embankment is analyzed considering the resisting moment developed by the reinforcement due to oblique pull. Parametric study carried presents results for by homogeneous and non-homogeneous ground (cu increasing with depth), thickness of soft ground, H, modulus of subgrade reaction, Ks, and tensile capacity of reinforcement, T.
Menu