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5. Factor of Safety Cases and Results <br />Case # <br />Density <br />Cohesion <br />Internal <br />Minimum <br />Comments <br />(Ibs /cu.ft.) <br />(Ibs /sq.ft.) <br />Angle of <br />Factor of <br />Friction <br />Safety <br />1 - embankment <br />118 <br />280 <br />30 <br />1.82 <br />This case uses <br />slightly higher <br />foundation density. <br />1 -foundation <br />110 <br />0 <br />33 <br />2 - embankment <br />118 <br />280 <br />30 <br />1.54 <br />This is the case <br />which uses the low <br />values from Table <br />2 - foundation <br />82 <br />0 <br />33 <br />1. <br />3 - embankment <br />110 <br />240 <br />29 <br />1.37 <br />Absolute worst <br />case strength <br />parameters. <br />3 - foundation <br />78 <br />0 <br />31 <br />4 - embankment <br />118.6 <br />420 <br />33 <br />1.75 <br />Most likely case <br />using average <br />parameters from <br />Table 1 and <br />4 - foundation <br />84.8 <br />0 <br />34 <br />density measured <br />on site. <br />5 - embankment <br />118 <br />280 <br />30 <br />2.22 <br />Case where <br />cohesion is <br />present in <br />foundation soil and <br />5 - foundation <br />82 <br />160 <br />33 <br />embankment <br />parameters are <br />conservative <br />6 - embankment <br />118 <br />420 <br />30 <br />2.32 <br />Case where <br />cohesion is <br />present in <br />foundation soil and <br />6 - foundation <br />82 <br />160 <br />33 <br />embankment <br />parameters are <br />average <br />Attachment 2.05.3(3) -15 -9 <br />