1.8. Pore Water Pressure Parameter

Try these first

1. 1.

   What are the three types of triaxial tests?

   Hint

   Think about the conditions under which drainage occurs.

2. 2.

   What does the term 'pore water pressure' refer to?

   Hint

   Remember how it relates to stress and soil behavior.

3. 3.

   What does the acronym 'CU' signify in triaxial tests?

   • Consolidated-Ultimate
   • Consolidated-Undrained
   • Consolidated-Under

   Hint

   Focus on the drainage conditions specified.

4. 4.

   True or False: Pore water pressure in soils increases linearly with effective stress.

   • True
   • False

   Hint

   Think about how stress changes relate to pore pressure.

5. 5.

   A saturated clay specimen has a confining pressure (σ3) of 100 kPa. If the axial stress at failure (Δσf) is 150 kPa, calculate the pore water pressure using Skempton's equation.

   Hint

   Remember to apply the correct values for A and the definitions closely.

6. 6.

   Explain the implications of using UU tests in predicting soil stability in construction projects, considering the role of pore pressure in your response.

   Hint

   Consider how rapid drainage might relate to structural stability when evaluating stress conditions.