What is consolidated drained test?

Consolidated drained (CD) In a ‘consolidated drained’ test the sample is consolidated and sheared in compression slowly to allow pore pressures built up by the shearing to dissipate. The rate of axial deformation is kept constant, i.e., strain is controlled.

What are different types of triaxial compression tests based on drainage conditions?

Depending on the combination of loading and drainage condition, three main types of triaxial tests can be carried out: Consolidated – Drained (CD) Consolidated – Undrained (CU) Unconsolidated – Undrained (UU)

Which type of soil collection technique would be used to collect a specimen that could be used in a triaxial test?

Triaxial Shear Test Procedure. The specimen can be prepared either remoulded or undisturbed. Undisturbed soil can be tested on soils that have sufficient cohesion. In order to make remoulded soils, cohesive soil is collected and compacted properly.

What is consolidated undrained triaxial test?

The standard consolidated undrained test is compression test, in which the soil specimen is first consolidated under all round pressure in the triaxial cell before failure is brought about by increasing the major principal stress.

What is triaxial compression test?

DEFINITIONS. 2.1 Triaxial Compression Test—the triaxial compression test a test in which a cylindrical specimen of soil or rock encased in an impervious membrane is subjected to a confining pressure and then loaded axially to failure in compression.

How do you conduct a triaxial test?

A typical triaxial test involves confining a cylindrical soil or rock specimen in a pressurised cell to simulate a stress condition and then shearing to failure, in order to determine the shear strength properties of the sample. Most triaxial tests are performed on high quality undisturbed specimens.

How do you perform a triaxial compression test?

What is a UU triaxial test?

The UTEST Triaxial Test System provides automated triaxial compression tests on cylindrical undisturbed and remolded soil samples. Unconsolidated undrained (UU), consolidated drained (CD) and consolidated undrained (CU) compression tests can be automatically run, controlled and reported using this apparatus.

What is drained test?

1. n. [Geology, Geophysics, Formation Evaluation] Test in which the pore fluid in the sample is able to flow and equilibrate to imposed pore pressure conditions; the fluid mass and volume will vary but its pressure will be constant.

Which of the following Cannot be obtained by using UN drained test?

4. Which of the following cannot be obtained by using un-drained test? Explanation: Since only one Mohr circle in terms of effective stresses, is obtained from all un-drained tests, effective stress failure envelope cannot be obtained from this test.

What is consolidated undrained triaxial compressive strength?

(a) (b) (c) (d) Relationship between deviatoric stress and axial strain at different applied confining pressures: (a) 2.5W+C100+P40, (b) 3.0W+C100+P70, (c) 3.0W+C200, and (d) 3.0W+C200+P50.

What are the different types of shear tests used in triaxial compression?

Three types of shear tests are commonly used in the triaxial compression test, depending on the drainage conditions in the field. 1. Unconsolidated undrained (UU) test. 2. Consolidated undrained (CU) test. 3. Consolidated drained (CD) test.

What is the consolidated drained test (CD test)?

The consolidated drained test (CD test) is run in such a manner so as to cause no change in the neutral stress. Any in­ crease in total stress produces a corresponding change in -effec·tive stress. The consolidation of ·the soil takes place in two stages. First, the soil is consolidated under the confining cell pressure -2-

What is the consolidation stage of a triaxial stress test?

CU and CD Triaxial tests normally start with a saturation stage, which then leads onto a consolidation stage. The consolidated stage can be either; a) isotropic; the stress surrounding the sample is equal in all directions or b) anisotropic; the stress surrounding the sample is not equal in all directions.

What is the triaxial test for soil?

The triaxial test typically involves placing a cylindrical specimen of soil, ranging from 38mm to 100mm diameter, into a cell that can be pressurised. Most specimens have an approximate 2:1 height-to-diameter ratio, and are sealed within a rubber membrane.