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 Taylor’s Stability Number, Sn is 0.08 and if the canal flows full, the factor of safety with respect to cohesion against failure of the canal bank slopes will be

  1. 3.7

  2. 1.85

  3. 1.0

  4. None of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Factor of safety for a slope is given by Fs = C / (Sn * gamma * H). Using the given cohesion, stability number, unit weight, and height, the calculation results in 1.85.

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