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Rock Stability
GWT on tension crack
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GTW on tension crack |
The slip surface is entirely below the ground water table; the GWT either intersects the tension crack or is aligned with terrain, the maximal value of uplift pressure is at the toe of face.
Hydrostatic pressure on slip surface and on tension crack, max. value at the toe of slope
The value of uplift pressure u at the intersection of slip surface and tension crack is given by:
| where: | γw | - | bulk weight of water |
| ht | - | height of GWT above the line of intersection of slip surface and tension crack |
The resulting compressive water force V acting in the direction normal to the tension crack is given by:
| where: | γw | - | bulk weight of water |
| ht | - | height of GWT above the line of intersection of slip surface and tension crack | |
| φ | - | deflection of tension crack from vertical |
The value of pressure u1 at the toe of slope is given by:
| where: | γw | - | bulk weight of water |
| Hw | - | height of GWT above toe of slope |
The resulting compressive water force U acting in the direction normal to the tension crack is given:
| where: | u | - | water pressure acting on the line of intersection of slip surface and tension crack |
| u1 | - | water pressure at toe of slope | |
| ht | - | height of GWT above the line of intersection of slip surface and tension crack | |
| α | - | deflection of slip surface from horizontal | |
| Hw | - | height of GWT above toe of slope |
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