Abstract: “This paper studies the effects of using sandgeofoam beads mixture as the backfill of cantilever rigid retaining walls on the factor of safeties against possible modes of failure. With this regard, concrete walls with specified geometrical properties are assumed and backfill material properties are extracted from a previously achieved research work. Factor of safeties against failure modes including transitional, overturning and deep-seated for different heights of wall and geofoam-sand mass ratio were obtained. Results show that unlike gravity rigid retaining walls backfilled with the sandgeofoam beads, cantilever walls don’t follow a steadily increasing trend in two of the failure mode’s factor of safeties.”

Keywords: rigid contilever retaining wall, sand-geofoam beed mixture, stability, factor of safety