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Question
Consider the following statements:
1. The water content of a soil remains unchanged during the entire duration of a 'quick' test.
2. Effective stress cum shear parameters of clay can be obtained from drained triaxial shear test.
3. Strain-controlled shear test is good option since this test procedure maintains better control on the rate of loading than other tests.
Which of the above statements is/are correct?
A.
1, 2 and 3
B.
1 only
C.
1 and 3 only
D.
2 and 3 only
Answer ( Option A)

1, 2 and 3

Solution

1. Quick test is similar to unconsolidated undrained (UU) test, as the rate of loading is greater than the rate of dissipation of pore water pressure.
2. Drainage is allowed in both the stages of drained triaxial shear test. The loading rate is slow to allow water to exit out. Therefore pore water pressure does not build up and we get effective stress parameters in this case.
3. The shear in direct shear test is applied eiter by increasing the shear displacement at a given rate of by increasing the shearing force at a given rate. Accordingly, the shear tests are either strain-controlled or stress-controlled.
In a strain-controlled test, the test is conducted in such a way that the shearing strain increases at a given rate. Generally, the rate of increase of the shearing strain is kept constant, and the speciment is sheared at a uniform strain rate.
Most of the shear tests are conducted as strain controlled. The stress-strain characteristics are easily obtained in these tests, as the shape of the stress-strain curve beyond the peak point can be observed only in a strain-controlled test. Moreover a strain-controlled test is easier to performs.

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