What are the advantages of the direct shear test?
Advantages of Direct Shear Test: Easy to prepare the sample. Convenient and simple test. The drainage is quick and the pore pressure dissipates very rapidly because the thickness of the sample is relatively small. Consolidated- undrained and drained tests take a small period of time.
What are the advantage and disadvantage of direct shear test?
3. Advantages and Disadvantages of Direct Shear Tests. The continual decrease in the contact surface of the two halves during the test produces a small error on the shear and normal stress and affects the Mohr-Coulomb failure envelope. This error is generally ignored.
What are the advantages and disadvantages of triaxial compression test in comparison with the direct shear test?
http://5.In evaluation of stresses triaxial test has the advantage of getting effective stress, uniform stress distribution over failure plane. But in direct test we get only total stress and non uniform distribution on failure plane.
What is the major point that the direct shear test differs from the other two shear test?
These two devices have apparent differences in the stress condition that is developed in the specimen during the test. The main differences are failure plane and principal stress. In direct shear device the failure plane has pre-assigned location, whereas in triaxial device the failure plane is uncertain.
What are the advantages of triaxial test?
Advantages of Triaxial Test The stress distribution on the failure plane is uniform. There is complete control over the drainage. Pore pressure changes and the volumetric changes can be measured directly.
What is the purpose of 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 disadvantage of shear box test?
The disadvantages of the test include: The failure plane is always horizontal in the test, and this may not be the weakest plane in the sample. There is no provision for measuring pore water pressure in the shear box and so it is not possible to determine effective stresses from undrained tests.
What is the difference between direct shear test and simple shear test for soil testing?
In these two tests, different shearing conditions are applied to soil samples. For the direct shear test, shearing occurs at a predetermined center of the specimen which may not be the weakest plane of the soil while indirect simple shear, the entire specimen distorts without the formation of single shearing surface.
Which of the following is a disadvantage of the shear box test *?
Which of the following is a disadvantage of the shear box test? Explanation: The stress condition across the soil sample is very complex. The distribution of normal stresses and shearing stresses over the potential surface of sliding is not uniform. The entire strength of the soil is not mobilized simultaneously.