ABSTRACT
Draw a triangle of forces in which the magnitude and the direction for W is known and only the directions of the other two forces C and F are known.
Length ad gives the cohesive force C = 520 kN
Mobilized cohesion,
, C 520 2 c = -=-= 17.51 kN/m
m L 29.7
Therefore the factor of safety with respect to cohesion, F c ' is
c' 30F =-=--=1.713 c c~ 17.51
will be 1.713 if the factor of safety with respect to friction, Ft/J = 1.0
tan 50 If F -'15 then At' =--=0.058 fad·, Of At