(a) Using the Barnes slope stability tables for excavated slopes, determine if a face inclination of 1 horizontal to 1 vertical is safe for a 16-m-high slope in soils where γ is 18.75 kN/m3, c′ is 15 kPa,
is 25°, and the groundwater table is 8 m below the top of the slope (or 8 m above the toe of the slope). (b) Determine the slope factor of safety if the excavation for the conditions described in part (a) is made with an inclination of 2 horizontal to 1 vertical. (c) Can this excavated slope be made with an inclination of 1.5 horizontal to 1 vertical and still be safe against a slide failure?
