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In determination of pre-consolidation pressure ___________ point of virgin curve is selected.

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In determination of pre-consolidation pressure ___________ point of virgin curve is selected.

(a) maximum curvature

(b) maximum radius

(c) minimum curvature

(d) initial point

The question was asked during a job interview.

My question comes from Consolidation of Undisturbed Specimen in division One Dimensional Consolidation of Geotechnical Engineering I

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The correct answer is (a) maximum curvature

The explanation: The point A of maximum curvature or minimum radius is selected and horizontal line AB is drawn. Tangent AC is drawn and also the bisector AD. The straight portion of the virgin curve is extended back to meet the bisector at point P. The point P corresponds to pre-consolidating pressure.

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