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Vincent Chu answers......
In conducting triaxial test to determine shear strengths for soil samples, what consolidation pressures should be specified?
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Vincent T. H. Chu is renowned internationally Photograph of vincent chuas walking encyclopedia of civil engineering. Author of a number of widely acclaimed civil engineering books, Mr Chu is recipient of various reputed awards including Young Engineer of the Year Award 2008 (Merit) by the Hong Kong Institution of Engineers &  Ombudsman’s Award 2007 (under complaint-related category). He is also listed in 11th Edition of Marquis Who's Who in Science and Engineering. ConcreteBasics.org thanks him for his exemplary contribution to the cause of civil engineers around the world.
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Theoretically, it appears that the selection of consolidation pressure is independent of in-situ soil stress.

However, this may not be correct because the actual shear strength envelopes for soils are non-linear over a  wide range of stresses. Therefore, consolidation pressure corresponding to the range of stresses relevant to site condition should be adopted.


Reference: 200 Questions and Answers on Practical Civil Engineering Works by Vincent Chu
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