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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 Intemal Angle of Friction <br /> = <br /> Tangent of Actual Angle of Failure Surface <br /> Tan 340 .6745 <br /> FOS= _ = 1.344 <br /> Tan 26.60 .5000 <br /> This factor of safety exceeds the normal long terns safety factor of 1.3,therefore,the final slopes <br /> are acceptable. <br /> i <br /> i <br /> i <br /> I <br /> 1 <br /> Graff Pit,March 2012 U 3 <br />