The Oedometer test is primarily used to determine which of the following property/properties of soil? i. Consolidation characteristics ii. Permeability iii. Shear strength
- AOnly (i)
- BOnly (i) and (ii)Correct
- COnly (ii) and (iii)
- D(i), (ii) and (iii)
Solution
Concept
Soil consolidation determination using oedometer test
Formula
NONE
Step-by-step solution
1. An oedometer (one-dimensional consolidometer) is specifically designed to measure soil compressibility and consolidation parameters under vertical load. 2. Although permeability can be indirectly estimated from consolidation data, the direct and primary property determined is consolidation. 3. Therefore, statement i alone represents the primary property measured. Answer: B
Explanation
The oedometer test is primarily used to determine the one-dimensional consolidation parameters of a soil sample under applied loads. Additionally, the coefficient of permeability can be calculated indirectly from consolidation test data using Terzaghi consolidation theory. Because shear strength is measured using shear tests rather than an oedometer, option B is correct.
Why the other options are wrong
C) Shear strength is measured using direct shear, triaxial, or unconfined compression tests rather than an Oedometer. D) Statements (ii) and (iii) are not the primary properties determined by the Oedometer test.
Shortcut
Oedometer test measures consolidation and indirect permeability, but not shear strength.
Common mistake
Selecting option A by overlooking that permeability can be calculated from consolidation data, or option D by including shear strength.
Correct answer: B) Only (i) and (ii)