Unconsolidated Undrained Triaxial Test Procedure

Unconsolidated undrained uu test.

Unconsolidated undrained triaxial test procedure. Unconsolidated undrained test uu as the name tells the soil sample is subjected to cell pressure with no provision. Triaxial shear test procedure 1. The specimen is axially loaded at a constant rate of axial deformation strain controlled. The soil specimen is enclosed in the rubber membrane to prevent entry of cell fluid into the voids of the soil specimen.

Uu triaxial tests commonly do not have a saturation or consolidation stage performed. Solids discs are used to conduct undrained test. In saturated soils the void. This procedure differs from the others in that drainage is not allowed at any time and therefore no consoli dation till es place.

The soil specimen in rubber membrane is mounted on the pedestal of the triaxial cell and fixed in position with the help of o rings. The tests are commonly abbreviated to ciu consolidated isotropic undrained or cau consolidated anisotropic undrained. During or directly following a construction project. The utest triaxial test system provides automated triaxial compression tests on cylindrical undisturbed and remolded soil samples.

3 this is also a quick test as it is undrained. Unconsolidated undrained uu consolidated drained cd and consolidated undrained cu compression tests can be automatically run controlled and reported using this apparatus. This allows the undrained shear strength c uto be determined which is suitable for assessing soil stability in the short term e g. 1 the confining pressure is not zero.

No drainage of the specimen is permitted during the application of the confining fluid pressure or during the compression phase of the test. The sample is compressed at a constant rate strain controlled. In an unconsolidated undrained test the loads are applied quickly and the sample is not allowed to consolidate during the test. Consolidated undrained test unlike the.

The triaxial cell is fixed to its bottom. The test normally only consists of a shear stage. Unconsolidated undrained test in the unconsolidated undrained shear test the sample of soil is subjected to pressure. In the last stage the sample is sheared to failure.

4 the test can be performed in any type of soil. Specimens are subjected to a confining fluid pressure in a triaxial chamber. Uu unconsolidated undrained test is type of triaxial test. Consolidated undrained test cu here during the application of cell pressure on the sample drainage is permitted.

The unconsolidated undrained uu test is the simplest and fastest procedure with soil specimens loaded whilst only total stresses are controlled and recorded. The third type of triaxial test is the unconsolidated undrained test uu test.