An embankment has a slope of 30° which was constructed with soil having C = 30 kN/m2, ϕ = 20° and γ = 15 kN/m3. The height of the embankment is 20 m. Using Taylor’s stability no 1/40, the factor of safety with respect to cohesion is
1
0.25
2
2
3
4
4
1.5