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To provide safety against piping failure, with a factor of safety of 5, what should be he maximum permissible exit gradient for soil with specific gravity of 2.5 and porosity of 0.35?
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- 0.155
- 0.176
- 0.195
- 0.213
Correct Option: C
| iC = | = (G- 1)(1 - η) | (1 + e) |
= (2.5 – 1) (1– 0.35) = 0.975
max. possible exit gradient, = 0.975/5 = 0.195 (F. S = 5)
