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Rock Stability
Water acting on tension crack only
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Water acting on tension crack only |
The slip surface is fully dry; the GWT either intersects the tension crack or is aligned with terrain, the maximal value of uplift pressure is at the intersection of slip surface and tension crack.
Water acting on tension crack only
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 water pressure acting on slip surface is equal to zero.
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