GWT on Tension Crack, Max. Tens. Crack
| GWT on tension crack |
The slip surface is entirely below the groundwater table, the GWT either intersects the tension crack or is aligned with the terrain (water can outflow at the slope heel), the maximal value of uplift pressure is at the intersection of tension crack and slip surface.
Hydrostatic pressure on slip surface and on tension crack
The value of uplift pressure u at the intersection of slip surface and tension crack is given by:
where: | γw | - | unit 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 | - | unit 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 resulting value of pressure u1 at the toe of the slope is equal to zero.
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 |
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 the toe of the slope |