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EXAM PREPARATION

Objective Question & Answer

QUESTION

Objective Question

Q.1

Choose correct option regarding statements given below in connection with

'triaxial compression test'

1. A soil specimen, cylindrical in shape is subjected to direct stresses acting in

three mutually perpendicular directions.

2. Length of specimen in the test is kept about 3 to 3.5 times its diameter. 

3. The effective minor principal stress is equal to the cell pressure minus the pore

pressure. 

A
1, 2 and 3 all are true and correct 
B
 2 and 3 are correct, 1 is incorrect 
C
1 and 2 are correct, 3 is incorrect 
D
1 and 3 are true, 2 is incorrect
Answer ( Option D)

1 and 3 are true, 2 is incorrect

Solution

Statement 1: Correct

In a triaxial compression test, a cylindrical soil specimen is subjected to three

mutually perpendicular principal stresses.

In a conventional triaxial compression test:

Statement 2: Incorrect

In a standard triaxial compression test, the height-to-diameter ratio of the

cylindrical soil specimen is generally maintained between 2 and 2.5.

Statement 3: Correct

According to Terzaghi's effective stress principle:

The effective minor principal stress is:

 

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