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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

I had been asked this question in class test.

Asked question is from Drainage and Dewatering in section Drainage and Dewatering of Geotechnical Engineering I

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Correct option 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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