Unconsolidated Undrained Triaxial Test Procedure

Uu triaxial tests commonly do not have a saturation or consolidation stage performed.

Unconsolidated undrained triaxial test procedure. The soil specimen is enclosed in the rubber membrane to prevent entry of cell fluid into the voids of the soil specimen. 1 the confining pressure is not zero. 4 the test can be performed in any type of soil. The tests are commonly abbreviated to ciu consolidated isotropic undrained or cau consolidated anisotropic undrained.

Consolidated undrained test unlike the. In the last stage the sample is sheared to failure. Uu unconsolidated undrained test is type of triaxial test. Triaxial shear test procedure 1.

Specimens are subjected to a confining fluid pressure in a triaxial chamber. Consolidated undrained test cu here during the application of cell pressure on the sample drainage is permitted. 2 we need to test at least three samples at different confining pressure to obtain the mohr coulobm failure circles. Unconsolidated undrained uu consolidated drained cd and consolidated undrained cu compression tests can be automatically run controlled and reported using this apparatus.

The sample is compressed at a constant rate strain controlled. Solids discs are used to conduct undrained test. In saturated soils the void. During or directly following a construction project.

The unconsolidated undrained uu test is the simplest and fastest procedure with soil specimens loaded whilst only total stresses are controlled and recorded. The test procedure of the triaxial shear strength of soil can be divided into three main types which are explained as follows. Unconsolidated undrained uu test. Unconsolidated undrained test uu as the name tells the soil sample is subjected to cell pressure with no provision.

Unconsolidated undrained test in the unconsolidated undrained shear test the sample of soil is subjected to pressure. In an unconsolidated undrained test the loads are applied quickly and the sample is not allowed to consolidate during the test. The confining pressure is applied followed immediately by the axial stress. 3 this is also a quick test as it is undrained.

The test normally only consists of a shear stage. The triaxial cell is fixed to its bottom. 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 third type of triaxial test is the unconsolidated undrained test uu test.

The specimen is axially loaded at a constant rate of axial deformation strain controlled. This allows the undrained shear strength c uto be determined which is suitable for assessing soil stability in the short term e g.