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14 Cards in this Set
- Front
- Back
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Compression... |
is positive in geotechnical engineering |
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Geostatic |
Stresses at a location due to overlying soil and water |
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Contributers to geostatic stress |
- Weight of the soil column - Water pressure - Applied surface loads |
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Total normal stress (sigma) |
Stress on a plane due to soil contact and water pressure |
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Effective normal stress (sigma ') |
Stress on a plane due to particle contact only (controls strength) |
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Shear stress in soils... |
is the same regardless of the presence of water |
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K0 |
coefficient of lateral earth pressure at rest (undisturbed soil) |
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Ka |
coefficient of active earth pressure (requires movement of the soil) |
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Kp |
coefficient of passive earth pressure (requires movement of the soil) |
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Downward seepage |
- increases effective stress - water drags soil particles downward (generally good) |
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Upward seepage |
- reduces effective stress - water drags soil particles upward (generally bad) |
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if the effective stress = 0 |
- critical zone - i = 0.9 - 1.0 - soil grains float, no longer in contact - quick condition |
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Capillary rise causes... |
negative pore pressure in soils above the G.W.T. |
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Negative pore pressures... |
increases effective stress |
