(a) Using the Barnes slope stability tables, determine the steepest slope angle that provides a factor of safety of 1.20 for an earth embankment where the slope geometry and soil properties are as...

(a) Using the Barnes slope stability tables, determine the steepest slope angle that provides a factor of safety of 1.20 for an earth embankment where the slope geometry and soil properties are as follows:

• Slope height .

• Soil unit weight .

• Angle of internal friction .

• Cohesion c = 15 kpa.

• r_u
= 0 .

(b) Use the same conditions as for r_u
part (a) except the weighted value for .ֹ