GATE CE 2018 Set 2 — Question 18
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Geotechnical Engineering → Seepage → Flow Nets
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Question
A flownet below a dam consists of 24 equipotential drops and 7 flow channels. The difference between the upstream and downstream water levels is . The length of the flow line adjacent to the toe of the dam at exit is . The specific gravity and void ratio of the soil below the dam are 2.70 and 0.70, respectively. The factor of safety against piping is
Correct answer
(D) 4
Solution
1.Critical Hydraulic Gradient ():
2.Exit Gradient ():
The head drop per equipotential drop is .The exit gradient is calculated for the last field at the exit:
3.Factor of Safety (FOS):
Thus, the factor of safety against piping is 4.Continue learning with Success Tracker
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