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?

Question

Quizplus · Accepted Answer

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.

What Is the Change in Total Stress Resulting from a Vacuum