Practice Examples (9.5) - Effective stress under Hydrodynamic Conditions

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6 sample questions

Question 1.
Define effective stress.
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Think about the forces acting on soil.
Question 2.
What does the hydraulic gradient represent?
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Remember it indicates water flow direction.
3Question 3.
What happens to effective stress during upward water flow?
- Increases
- Decreases
- Remains constant
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Think about what upward flow does to soil particles.
4Question 4.
True or False: The effective stress increases when the pore water pressure rises while total stress remains unchanged.
- True
- False
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Recall how effective stress is calculated.
Question 5.
A soil layer has a total stress of 30 T at a depth of 10 m and a pore water pressure of 15 T. What is the effective stress?
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Apply the effective stress formula.
Question 6.
A construction site experiences a rise in pore water pressure of 5 T while total stress remains constant. What happens to effective stress?
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Think about changes in pore water pressure affecting stability.

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