Question

The initial pore water pressure at a point A in a clay layer was 10 kPa. A surcharge of 15 kN/m${}^2$ was placed on Ground surface. The excess pore water pressure at beginning and end of the consolidation of clay layer are (in kN/m${}^2)$

• A. 15 and 0
• B. 25 and 15
• C. 25 and 0
• D. 25 and 10

Answer 1

The correct option is A 15 and 0

Increase in vertical stress $=\Delta \overline{\sigma }=15kPa$

Initial excess pore water pressure $=\Delta u=15kpa$

This dissipates and becomes zero at end