9. Effective stress under Hydrodynamic Conditions
The chapter discusses effective stress under hydrodynamic conditions, focusing on the effects of pore water pressure changes within soil due to seepage. It highlights how hydraulic gradients influence effective stress differently during upward and downward flows, emphasizing conditions like quicksand. The implications of changes in total stress and pore water pressure on soil stability, particularly under different water table conditions, are examined.
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What we have learnt
- The hydraulic gradient is crucial for understanding seepage effects on effective stress.
- Effective stress can be reduced to zero in quicksand conditions, leading to soil behaving like a viscous liquid.
- Changes in pore water pressure significantly impact effective stress and soil stability.
Key Concepts
- -- Effective Stress
- The concept that represents the stress carried by the soil skeleton, defined as total stress minus pore water pressure.
- -- Hydraulic Gradient
- The change in pressure head per unit length along the flow path, which drives the movement of groundwater.
- -- Quicksand Condition
- A state where upward flow reduces effective stress to zero, causing soil to behave like a liquid.
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