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Who founded the method of determination of pre-consolidation pressure?

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Who founded the method of determination of pre-consolidation pressure?

(a) Casagrande

(b) Appuswamy

(c) Falcon India

(d) Darcy

I had been asked this question in class test.

The query is from Consolidation of Undisturbed Specimen topic in section One Dimensional Consolidation of Geotechnical Engineering I

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Right answer is (a) Casagrande

Easy explanation: Casagrande in 1936 gave the empirical method for finding the per-consolidation pressure. He selected a point in the graph that has the minimum radius and drew tangents to it. The bisecting point gives the pre-consolidation pressure.

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