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XSTABL assumes that the cracked section extends the specified distance below the entire
ground surface specified using the surface boundary segments. This assumption is shown in Fig.
3.11 along with the assumed direction and location of the hydrostatic force if the crack is filled with
water. With this option the shape of the failure surface, as it extends upwards from the toe of the
slope to the crest, will default to a vertical (scarp) once it encounters the specified cracked zone.
Fig. 3.11. Definition of cracked section and hydrostatic force
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