Question: A fully developed discontinuity extends from the toe to the crest on a 1 5 m high slope with a 6 8 slope angle. The

A fully developed discontinuity extends from the toe to the crest on a 15 m high slope with a 68 slope angle. The discontinuity is planar, with a friction angle of 32 and cohesion of 15 kN/m^2, and has a strike parallel to the slope face, dipping at 45. Calculate the factor of safety for a potential planar slope failure. The rock has a unit weight of 25 kN/m^3.
i have input values into Rocplane software and the factor of safety is 0.8. please figure out workings to reflect correct answer.

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