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Question 8 "For the same soil slope in previous question, an external surcharge is applied along the distance AB as appears in the Figure below. Due to the surcharge, stability of the slope becomes critical and the soil wedge is about to slip (Factor of safety becomes equal to 1). Determine the magnitude of the surcharge q. Assume no tension crack" 68° q kN/m² B 3.0 m Answers: 67.65 kPa 43.13 kPa 89 kPa 55.78 kPa 4.5 m 3.2 m R = 8.6 m W A ▬▬Z 4 4 m
Question 7 The Figure below shows a soil slope made of a cohesive soil with an undrained shear strength (cu) equal to 35 kPa and a bulk unit weight of 19 kN/m3. Determine the factor of safety for the soil slope at the given trial slip surface. Assume the area of X the potential slipping wedge is 18.6 m2 and the horizontal distance between the centroid of the wedge and the centre of rotation is 3.75 m. Assume no tension crack. Factor of safety against rotational slip : F = C₁ xlxr W xd O 3.0 m Answers: 3.6 2.0 2.9 1.76 68⁰⁰ 4.5 m 3.2 m R= 8.6 m W