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The Factor of Safety(FOS)for gravel with n(2H:IV)26.6 degree slope in GC classified <br /> material with an assumed internal angle of friction of 34 degrees can be approximated by <br /> ignoring the cohesion component of the stability and simply evaluating the internal angle of <br /> friction as follows: <br /> FOS <br /> Tangent of Internal Angle of Friction <br /> = <br /> Tangent of Actual Angle of Failure Surface <br /> Tan 341 .6745 <br /> FOS= _ = 1.349 <br /> Tan 26.6° .5000 <br /> This factor of safety exceeds the normal long term safety factor of 1.3,therefore,the final slopes <br /> are acceptable. <br /> i <br /> i <br /> i <br /> GraffPit, March 2012 U-3 <br />