P

Fig. 5.21 Effective stress analysis: forces acting on a vertical side.

Let the other forces acting on the slice be: W = weight of slice

P = total normal force acting on base of slice T = shear force acting on base of slice and the other notation is:

z = height of slice b = breadth of slice

1 = length of BC (taken as straight line) a = angle of between P and the vertical x — horizontal distance from centre of slice to centre of rotation, O. In terms of effective stress, the shear strength mobilised is c' + (f„ - u) tan <//

Total normal stress on base of slice:

0 0

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