Practice Change in pore water pressure - 9.1 | 9. Effective stress under Hydrodynamic Conditions | Geotechnical Engineering - Vol 1
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Knowledge

9.1 - Change in pore water pressure

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Learning

Practice Questions

Test your understanding with targeted questions related to the topic.

Question 1

Easy

What formula represents effective stress?

💡 Hint: Think about how total stress and pore water pressure interact.

Question 2

Easy

What happens to effective stress if pore water pressure increases?

💡 Hint: Consider the relationship of stress forces.

Practice 4 more questions and get performance evaluation

Interactive Quizzes

Engage in quick quizzes to reinforce what you've learned and check your comprehension.

Question 1

What is the primary effect of downward water flow on effective stress?

  • Decreases effective stress
  • Increases effective stress
  • No effect

💡 Hint: Think about how gravity and water act together.

Question 2

True or False: A rise in groundwater pressure always leads to an increase in effective stress.

  • True
  • False

💡 Hint: Refer back to the definition of effective stress.

Solve and get performance evaluation

Challenge Problems

Push your limits with challenges.

Question 1

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?

💡 Hint: Ensure you use the correct effective stress formula.

Question 2

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?

💡 Hint: Use the concept of balancing forces to find the answer.

Challenge and get performance evaluation