Direction: The flow net around a sheet pile wall is shown in the sketch. The properties of the soil are: permeability coefficient = 0.09 m/day (isotropic), specific gravity = 2.70 and void ratio = 0.85. The sheet pile wall and the bottom of the soil are impermeable.
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The factor of safety against the occurrence of piping failure is
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- 3.55
- 2.93
- 2.60
- 0.39
Correct Option: C
| F = | ie |
| ic = | = | = 0.919 | ||
| (1 + e) | 1 + 8.5 |
| ie = | l |
| ∆h = | Nd |
(head loss between consecutive equipotential lines)
| = | = 1.063 | 8 |
L = 3 m (given in figure)
| ie = | = 0.354 | 3 |
| ∴ F = | = 2.59 | 0.354 |
