GATE CE 2020 Set 1 — Question 57
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Geotechnical Engineering → Effective Stress & Compaction → Effective Stress Under Seepage
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Question
Water flows in the upward direction in a tank through thick sand layer as shown in the figure. The void ratio and specific gravity of sand are and , respectively. The sand is fully saturated. Unit weight of water is .
The effective stress (in kPa, round off to two decimal places) at point A, located above the base of tank, is ________.
Correct answer
8.7 to 9.3
Solution
1.Calculate the saturated unit weight of sand ():
2.Determine the depth of point A from the top of the sand layer ():
3.Calculate the hydraulic gradient ():
4.Calculate the effective stress () at point A with upward seepage:
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