Triaxial Unconsolidated Undrained Compression Test

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Definition - What does Triaxial Unconsolidated Undrained Compression Test mean?

A triaxial unconsolidated undrained compression test is used to determine the mechanical properties of soil by subjecting the soil sample to varying levels of stress and drainage conditions. The saturated specimen is subjected to confining fluid pressure in a triaxial cell. The test is generally carried out on three specimens os the same soil sample but subjected to different confining stresses.

Trenchlesspedia explains Triaxial Unconsolidated Undrained Compression Test

The triaxial unconsolidated undrained compression test is conducted as per the American Society of Testing and Materials (ASTM) D2850-15. In the triaxial unconsolidated undrained compression test, the compressive strength of the soil is determined in terms of total stress.

This means that the resulting strength depends on the pressure developed in the pore fluid during loading. During the test, as the load is being applied, fluid flow is not permitted from or into the soil specimen.

The unconsolidated-undrained shear strength is applicable in situations where load movement is so rapid that the time required for the induced pore water pressure to dissipate or for consolidation to take place during the loading period is insufficient.

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