Stability of Slopes - Elements of Soil Mechanics - page 424

Fig. 13.34 Exercise 13.6.

With the values, and using the conventional method, determine the safety factor
of the slope at the end of construction assuming the pore pressure ratio to be 0.4
and the cohesion of soil and the angle of shearing resistance (with regard to effec-
tive stresses) to be 10 kPa and 30°, respectively. The radius of the slip circle was
18.8 m and the angle subtended at the centre of the circle was 100°.

Answer 1.12

Exercise 13.7

Using the slip circle shown in Fig. 13.35, determine the F values for r u = 0.4, 0.6
and 0.8. Plot r u against F. γ = 21 kN/m 3 , c ′ = 5 kPa, φ ′ = 37.5°.

Answer By rigorous method F 1.3 0.8 0.4

r u 0.4 0.6 0.8

Fig. 13.35 Exercise 13.7.

Exercise 13.8

Using Bishop and Morgenstern's charts, determine the factors of safety for the fol-
lowing slopes: