Consolidated undrained vs unconsolidated undrained test

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In consolidated undrained tests, only an increase in pore water pressure occurs due to deviator stress application because drainage is allowed during the initial phase, preventing pressure buildup. Conversely, in unconsolidated undrained tests, both pore water pressure increases from deviator stress and initial conditions are observed since the chamber is sealed, allowing pressure to rise. The distinction lies in the drainage conditions during the application of external pressure. Understanding these differences is crucial for accurate analysis in geotechnical engineering. The discussion highlights the importance of drainage conditions in interpreting pore pressure responses.
fonseh
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Homework Statement


In the consolidated undrained , why there's only increase in pore water pressure due to deviator stress application ? Why in unconsolidated undrained test , why there is both increase in pore water pressure due to deviator stress application (ud) and also uc ?

Homework Equations

The Attempt at a Solution


IMO , in the consolidated undrained , the total pore pressure should be sum of ud and uc ...
 

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Not my field but...

Initially I shared your confusion. The only thing I can see is that in 12:10 there are two phases described. Drainage is allowed in the first phase which is when external chamber pressure is applied. If the chamber is open to allow drainage then pressure inside doesn't/can't build up.

In 2:11 the chamber is sealed when external pressure is applied so the pressure inside can increase.

I might be wrong but that's the only way I could make sense of it.
 

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