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W
2
is obtained by integrating the water pressure distribution along the crack. In consi-
deration of (11.2), (11.3), (11.18) and (11.19) the stability of this wedge according to the
partial safety factor method can be assessed by the following utilization factor:
(11.20)
Figure 11.10
Two-dimensional rock wedge bounded by a discontinuity and a vertical crack
loaded by self-weight and water pressure (Hoek & Bray 1977)
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