1.3.2. Second Part of Effective Stress Principle

Try these first

1. 1.

   What is the formula for total stress at a certain depth?

   Hint

   Remember that γ is the unit weight of the soil.

2. 2.

   Define pore water pressure in simple terms.

   Hint

   Think about how water behaves in soil.

3. 3.

   What is the formula for effective stress?

   Hint

   Remember the relationship defined by Terzaghi.

4. 4.

   True or False: Pore water pressure is zero at the water table.

   Hint

   Think about the definitions of water table and pressure.

5. 5.

   A construction site has a loading of 50 kN/m² applied on the surface. If the unit weight of the soil is 18 kN/m³ and the depth of interest is 4 m below the surface, calculate the effective stress at that depth when the pore water pressure is 10 kN/m².

   Hint

   Use the formulas for total and effective stress!

6. 6.

   Discuss how negative pore pressure could affect the effective stress in a partially saturated soil above the water table, especially in terms of capillary rise.

   Hint

   Consider suction effects and water dynamics in soils!