GATE CE 2025 Set 2 — Question 24
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Geotechnical Engineering → Earth Pressure → Capillarity
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Question
Which of the following statements is/are INCORRECT?
Correct answer
(A) As the depth of the ground water table from the ground surface increases, the effective stress in the soil decreases.; (D) The earth pressure at any point in the soil, under all conditions, is always smaller than the vertical effective stress at that point.
Solution
Statement (A) is incorrect because lowering the water table (increasing its depth) removes buoyancy, which increases the effective stress . Statement (B) is correct as capillary tension in moisture films around sand grains creates apparent cohesion that increases volume. Statement (C) is correct as liquefaction occurs when pore water pressure equals total stress , making . Statement (D) is incorrect because horizontal earth pressure can exceed vertical effective stress in passive states () or in overconsolidated soils ().
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