Influence of pore pressure parameter on seismic stability analysis of geosynthetic reinforced soil slope

Abstract

An accurate seismic external stability analysis of geosynthetic reinforced soil slopes under pseudo-static conditions using limit equilibrium method is presented. The effect of variation of different parameters, such as slope angle, soil friction angle, seismic acceleration coefficients (kh & kv), surcharge, cohesion and water forces on required length of reinforcement (L) is presented. The combined effect of parameters like surcharge loading (q), pore pressure ratio (ru), cohesion (c), hydrostatic & hydrodynamic pressure (pst and pdy) and formation of tension cracks Zc are also considered in the analysis and their effect on L are discussed. All the computations have been carried out by writing a computer coded program in MATLAB. The present study shows that with the increase in c values, the magnitude of L decreases, while it increases with an increase in q and kh to resist failure. Further as the pore pressure ratio increases, the length of reinforcement also increases to resist failure.