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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

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