9.1 - Change in pore water pressure
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Practice Questions
Test your understanding with targeted questions
What formula represents effective stress?
💡 Hint: Think about how total stress and pore water pressure interact.
What happens to effective stress if pore water pressure increases?
💡 Hint: Consider the relationship of stress forces.
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Interactive Quizzes
Quick quizzes to reinforce your learning
What is the primary effect of downward water flow on effective stress?
💡 Hint: Think about how gravity and water act together.
True or False: A rise in groundwater pressure always leads to an increase in effective stress.
💡 Hint: Refer back to the definition of effective stress.
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Challenge Problems
Push your limits with advanced challenges
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.
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.
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