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A 10 m high slope of dry clay soil (unit weight = 20 kN/m3), with a slope angle of 450 and the circular slip surface, is shown in the figure (not drawn to the scale). The weight of the slip wedge is denoted by. W. The undrained unit cohesion (Cu) is 60 kPa. The factor of safety of the slope against slip failure, is

A 10 m high slope of dry clay soil (unit weight = 20 kN/m3), with a slope angle of 450 and the circular slip surface, is shown in the figure (not drawn to the scale). The weight of the slip wedge is denoted by. W. The undrained unit cohesion (Cu) is 60 kPa. The factor of safety of the slope against slip failure, is Correct Answer 3.68

Concept:

The failure of finite slopes are broadly classified in 3 types:

(a) Face failure (b) Toe failure (c) Base failure

Important Points

Various methods for the analysis of finite slope:

(a) Based on Total stress analysis -

(i) Swedish circle method

(ii) Friction circle method

(iii) ϕU = 0 Analysis

(b) Based on Effective stress Analysis:

(i) Taylor’s Method

(ii) Bishop’s Method

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