Multiple choice

A canal having side slopes 1:1 is proposed to be constructed in a cohesive soil to a depth of 10 m below the ground surface. The soil properties are: $\phi_u$=150, Cn=12 kPa, e = 1.0, Gs = 2.65.

If there is a sudden drawdown of water in the canal and if Taylor’s Stability Number for the reduced value of $\phi_u$is 0.126, the factor of safety with respect to cohesion against the failure of bank slopes will be

  1. 1.85

  2. 1.18

  3. 0.84

  4. 0.53
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Using the same formula as the previous slope stability question but with the new stability number Sn = 0.126, the factor of safety is calculated as Fs = C / (Sn * gamma * H). This yields 0.53.

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