FINITE ELEMENT METHOD OF SEEPAGE AND STABILITY ANALYSIS OF SAURA-KEFFI EARTH DAM

Finite element method (FEM) based analysis using the SEEP/W and SLOPE/W sub-programme options of a GEOSTUDIO software was used to analyze Saura-Keffi earth dam in Nasarawa State, Nigeria with view seepage its stability. The created geometry assigned material properties boundary conditions at reservoir water levels of: minimum (3 m), normal (6 m) maximum (7 m). conducted under cases that without measures (SCM). results analyzed semi-permeable homogenous revealed percentage reduction inseepage flux 28.3% when considered central core complete cut-off trench along crest axis. see figure 7. pore-water (PWP) decrease value from (12 11.2) kPa head SCM. PWP further increased by 18.9% as rises 6 m 7m exit gradient showed an insignificant increase 1.2% construction SCM which indicates less flow end leading horizontal filter drain downstream lower kept phreatic line within body allow for adequate embankment foundation drainage shown (5&6). F.S level 1.27 1.52 considered. Morgenstern-priced slope stability estimate acceptable 0.5 lambda introduction filter.