Practice Quiz

Civil Engineering PE

Category - Soil Mechanics

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What is the change in total stress resulting from a vacuum triaxial test that reduced the pore pressure of a dry sand sample by 4 kPa?
  1. - 4 kPa
  2. No change
  3. + 4 kPA
  4. Not enough information provided
Explanation
Answer: B - There is no change in the total stress resulting from a vacuum triaxial test that reduced the pore pressure of a dry sample by 4 kPA. This is attributed to Terzaghi’s effective stress principal that states that total stress equals effective stress plus pore pressure. The effective stress increased 4 kPa as a result of the test, but the overall total stress did not change.
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