Q1 The cross section of a slope is shown in Figure Q.1. The unit weight of...
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Q1 The cross section of a slope is shown in Figure Q.1. The unit weight of the soil both above and below the water table is 18 kN/m3, and the relevant shear strength parameters of the soil are, c' = 21 kN/m² and = 22° respectively. Assuming no tension crack is developed, and using the Simplified Bishop method of slices for the given failure surface using 5 slices with dimensions given in Table Q.1, (i) show by calculation that the factor of safety in terms of effective stress is 1.1 when there is NO surcharge. (10 marks) Slice No. b (m) 1 3 2 3 3 3 4 3 5 3 b C Figure Q1 h (m) 3 5 7 8 6 Table Q1 hw(m) 2 3 4 3.5 2 Piezometric level a (deg) -10 -5 15 40 60 Q1 The cross section of a slope is shown in Figure Q.1. The unit weight of the soil both above and below the water table is 18 kN/m3, and the relevant shear strength parameters of the soil are, c' = 21 kN/m² and = 22° respectively. Assuming no tension crack is developed, and using the Simplified Bishop method of slices for the given failure surface using 5 slices with dimensions given in Table Q.1, (i) show by calculation that the factor of safety in terms of effective stress is 1.1 when there is NO surcharge. (10 marks) Slice No. b (m) 1 3 2 3 3 3 4 3 5 3 b C Figure Q1 h (m) 3 5 7 8 6 Table Q1 hw(m) 2 3 4 3.5 2 Piezometric level a (deg) -10 -5 15 40 60
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