What is Uu and CD tests?
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 the difference between CD UU CU test conditions?
In a CU (undrained) test, pore pressure changes (U) are allowed to take place and are measured. In a CD (Drained) test drainage is allowed to prevent pore pressure changes happening. In this type of test the volume change of the sample is measured during the shear stage.
What is CU triaxial test?
Consolidated Undrained (CU) Triaxial Test To find the shear strength parameters (c’, Φ’) of soil for effective stress analysis. CU triaxial test is recommended for all types of soil including cohesive and cohesionless soils.
Is code for CU triaxial test?
IS 2720(Part 12):1981 Determination of Shear Strength parameters of Soil from consolidated undrained triaxial compression test with measurement of pore water pressure (first revision). Reaffirmed- Dec 2016. 4.1 Triaxial Test on Cohesive Soil: 4.1.
What is UU test in soil?
UU (unconsolidated undrained) test: In this, cell pressure is applied without allowing drainage. Then keeping cell pressure constant, deviator stress is increased to failure without drainage. CU (consolidated undrained) test: In this, drainage is allowed during cell pressure application.
What is triaxial strength?
Triaxial shear strength test on soil measures the mechanical properties of the soil. In this test, soil sample is subjected to stress, such that the stress resulted in one direction will be different in perpendicular direction. The test is most widely used and is suitable for all types of soils.
What do you understand by UU test?
Why do we do triaxial test?
Triaxial test to determine the shear strength of a discontinuity. The triaxial test can be used to determine the shear strength of a discontinuity. A homogeneous and isotropic sample fails due to shear stresses in the sample.
What is the purpose of triaxial shear test?
objective The tri-axial shear test is most versatile of all the shear test testing methods for getting shear strength of soil i.e. Cohesion (C) and Angle of Internal Friction (Ø), though it is bit complicated. This test can measure the total as well as effective stress parameters both.
What is CD test?
Consolidated Drained (CD) Triaxial Test Determination of strength and stress-strain relationships of a cylindrical specimen of “undisturbed” or “reconstituted” specimens. The soil specimens are isotropically consolidated and sheared in compression with drainage at a constant rate of axial deformation.
What is deviator stress in triaxial test?
2.2 Deviator Stress (Principal Stress Difference)–Deviator stress is the difference between the major and minor principal stresses in a triaxial test, which is equal to the axial load applied to the specimen divided by the cross-sectional area of the specimen, as prescribed in the section on calculations.
What is the purpose of triaxial compression test?
What’s the difference between UU total and CD Triaxial tests?
UU triaxial tests are termed total stress tests and CU/CD triaxial tests are termed effective stress tests. Figure 1 shows the stresses involved with a total stress test and Figure 2 summaries the stresses in an effective stress test.
Can a triaxial Cd-Cu UU be used on a computer?
Triaxial CD-CU-UU equipment is computer controlled, test values can be transferred to computer and data processing can be made with Triaxial software on Windows operating system. All data can be used on Excel programs.
What are the three types of triaxial testing?
There are three primary triaxial tests conducted in the laboratory, each allowing the soil response for differing engineering applications to be observed. These are: • Unconsolidated Undrained test (UU) • Consolidated Undrained test (CU) • Consolidated Drained test (CD) GDS Introduction to Triaxial Testing: Part 1 1.
How does the uTest triaxial test system work?
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.