GATE CE 2016 Set 1 — Question 53
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Geotechnical Engineering → Effective Stress & Compaction → Effective Stress Under Seepage
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Question
A seepage flow condition is shown in the figure. The saturated unit weight of the soil kN/m. Using unit weight of water, kN/m, the effective vertical stress (expressed in kN/m) on plane is ________ 
Correct answer
65.3 to 65.6
Solution
1.Identify Seepage Direction and Head Loss:
- Head at top of soil () = 3 m (relative to top of soil).
- Head at bottom of soil () = 1 m (relative to top of soil).
- Since , seepage is downward.
- Total head loss m.
- Length of soil column () = 5 m.
- .
- Plane is 1 m from the bottom, so it is at depth m from the top.
- For downward seepage, effective stress .
- kN/m.
- kN/m.
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