Practice Change In Pore Water Pressure (9.1) - Effective stress under Hydrodynamic Conditions

Practice: Change in pore water pressure

Lesson 9.1Effective stress under Hydrodynamic Conditions

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8 questions

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6 sample questions

Question 1.
What formula represents effective stress?
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Think about how total stress and pore water pressure interact.
Question 2.
What happens to effective stress if pore water pressure increases?
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Consider the relationship of stress forces.
3Question 3.
What is the primary effect of downward water flow on effective stress?
- Decreases effective stress
- Increases effective stress
- No effect
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Think about how gravity and water act together.
4Question 4.
True or False: A rise in groundwater pressure always leads to an increase in effective stress.
- True
- False
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Refer back to the definition of effective stress.
Question 5.
A soil layer with a thickness of 5m has a total stress of 40 kPa and a pore water pressure of 20 kPa. What is the effective stress and what implications does this have for stability?
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Ensure you use the correct effective stress formula.
Question 6.
If the critical hydraulic gradient is 1 and the unit weight of water is 9.81 kN/m³, at what depth will the upward water flow cause quick sand conditions in a deposit with a unit weight of 20 kN/m³?
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Use the concept of balancing forces to find the answer.

4 more questions in this section. Enroll free to practise them all.