Differences between triaxial tests

Differences between triaxial tests - D ifferences between t...

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Unformatted text preview: D ifferences between t r iaxial tests “CD, CU and U U”. CD Consolidated drained t r iaxial test a llows drainage to occur both consolidation and shearing Pore water pressure “u=o” because d rainage is allowed during both p hases Effective strength parameters can be determined of the soil being t ested As drainage is allowed, the pore p ressure will be slowly dissipates. T herefore, i t takes long t ime to be done i- • • • • i i- CU Consolidated undrained t r iaxial t est allows drainage to occur only d uring the fi rst loading phase w hich is the consolidation phase only During the consolidated undrained t r iaxial test, simultaneous measurements of pore pressure and deviator stress are recorded Write formula p.38 Both total and effective stress parameters can be determined if t he pore pressure and deviator s tress measurement are recorded a t failure As drainage is prevented, the deviator stress can be applied quickly • • • • • i ii- UU The drainage is prevented during both phases which is consolidation and shearing • I t is the quickest and easiest t r iaxial test • As drainage is prevented, the deviator s tress can be applied quickly • As the pore pressure cannot d issipate, the effective stress w ithin the testing sample will be constant • Only the total strength parameters can be determined as the testing condition is for total stress • ...
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Differences between triaxial tests - D ifferences between t...

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