GATE CE 2025 Set 2 — Question 31
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Geotechnical Engineering → Seepage → Exit Gradient
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Question
From a flow-net diagram drawn under a concrete dam, following information are obtained: (i) The head difference between upstream and downstream side of the dam is . (ii) The total number of equipotential drops between upstream and downstream side of the dam is . (iii) The length of the field nearest to the toe of the dam in the downstream side is .If the soil below the dam is having a saturated unit weight of and unit weight of water is , then the factor of safety against the quick condition will be ______ (round off to two decimal places).
Correct answer
1.24 to 1.3
Solution
1.Calculate the head loss per drop ():
Total head difference, Total number of equipotential drops,
2.Calculate the exit gradient ():
Length of the field nearest to the toe, 3.Calculate the critical hydraulic gradient ():
Saturated unit weight of soil, Unit weight of water,
Submerged unit weight,
4.Calculate the factor of safety ():
Rounding off to two decimal places, we get .Continue learning with Success Tracker
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