GATE CE 2018 Set 2 — Question 20
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Geotechnical Engineering → Soil Phase & Index Properties → Atterberg Limits
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Question
Which one of the following statements is NOT correct?
Correct answer
(B) Boussinesq’s theory is used for the analysis of stratified soil.
Solution
Statement (B) is incorrect because Boussinesq's theory assumes a homogeneous, isotropic, and semi-infinite elastic medium. For the analysis of stratified soil, Westergaard's theory is generally preferred as it accounts for the non-isotropic nature of layered deposits. Other statements are correct:
(A) The plastic state of a soil is defined as the range of water content between the plastic limit and the liquid limit.
(C) In cohesive soils, the presence of cohesion () allows a stable slope to be steeper than the angle of internal friction ().
(D) Dilatancy correction is applied to the observed -value in fine sands and silts below the water table if the corrected -value (after overburden correction) is greater than 15.
(A) The plastic state of a soil is defined as the range of water content between the plastic limit and the liquid limit.
(C) In cohesive soils, the presence of cohesion () allows a stable slope to be steeper than the angle of internal friction ().
(D) Dilatancy correction is applied to the observed -value in fine sands and silts below the water table if the corrected -value (after overburden correction) is greater than 15.
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