Probabilistic and Deterministic Analysis of Earth Dams

In this book, the program of SLIDE (version6.0) depending on two approaches; Deterministic and probabilistic analysis have been used to analyze slope stability and seepage of Mandali earth dams under different load conditions. The limit equilibrium method according to Bishop and Morgenstern-Price is applied to define the potential slip surface and to calculate the factor of safety of the dam slopes. The results obtained from deterministic analysis showed that the factor of safety decreases when increase the value of unit weight of the soil. The decrease also with varying proportions ratio for the increase of seismic load coefficients values and drawdown ratio for rapid drawdown condition. The factor of safety for drains increases when water level decreased with varying Proportions for the increase the value of cohesion of soil and angle of internal friction. For probabilistic analysis, the results showed that the probability of failure is equal to (55.2 %). Also sensitivity analysis is made to investigate the effect of each design parameter and shows that the parameters have sharp effects on the factor of safety of side slopes.