When the drainage is permitted only during the isotropic compression stage in finding shear strength of soil, the test is called_______.a)Quick testb)Unconsolidated-Undrained (UU) testc)Consolidated-Drained (CD) testd)Consolidated-Undrained (CU) testCorrect answer is option 'D'. Can you explain this answer?

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When the drainage is permitted only during the isotropic compression stage in finding shear strength of soil, the test is called_______.

a)
Quick test
b)
Unconsolidated-Undrained (UU) test
c)
Consolidated-Drained (CD) test
d)
Consolidated-Undrained (CU) test

Correct answer is option 'D'. Can you explain this answer?

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When the drainage is permitted only during the isotropic compression s...

Types of Triaxial Test on the basis of Drainage:
(i) Unconsolidated Un-drained (UU) Test:

In this test expulsion of pore water is not permitted in both stages. It is used for clays in short-term analysis for clays under un-drained conditions at a fast loading rate
Due to undrained conditions in both the stages, the ϕ does not get mobilized and gives 0 value, which can be verified by drawing Mohr failure envelope for UU test.

From the above graph, we can conclude the ϕ is 0, for UU. As ϕ is defined as the slope of failure envelope and here the slope of failure envelope is 0
(ii) Consolidated Drained (CD) Test:

In this test expulsion of pore water is permitted in both stages.
It is used for short-term and long-term stability analysis in saturated sands and long-term stability analysis in clays.

(iii) Consolidated Un-drained (CU) Test:

In this test, the expulsion of pore water is permitted in 1st stage but not in the second stage.
It is used for the investigation of the safety of the earthen dam which may occur due to the sudden drawdown of the water table.

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When the drainage is permitted only during the isotropic compression stage in finding shear strength of soil, the test is called_______.a)Quick testb)Unconsolidated-Undrained (UU) testc)Consolidated-Drained (CD) testd)Consolidated-Undrained (CU) testCorrect answer is option 'D'. Can you explain this answer?

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