In a tri-axial test when the drainage is allowed initially only and not during latter stage, the test is known as

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BPSC AE Paper 5 (Civil) 11 Nov 2022 Official Paper
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  1. consolidated undrained test
  2. unconsolidated drained test
  3. unconsolidated undrained test
  4. consolidated drained test

Answer (Detailed Solution Below)

Option 1 : consolidated undrained test
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Explanation:

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.

F1 Akhil Pathak 22.6.21 Pallavi D1

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.

F1 Akhil Pathak 22.6.21 Pallavi D2

(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.

F1 Akhil Pathak 22.6.21 Pallavi D3

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