The surface of a granular soil mass is inclined at 25° to the horizontal. The soil is saturated throughout with a water content of 15.8%, particle specific gravity of 2.65 and an effective angle of...

The surface of a granular soil mass is inclined at 25° to the horizontal. The soil is saturated throughout with a water content of 15.8%, particle specific gravity of 2.65 and an effective angle of shearing resistance of 38°.At a depth of 1.83 m water is seeping through the soil parallel to the surface. Determine the factor of safety against slipping on a plane parallel to the surface of the soil at a vertical depth of 3.05 m below the surface.