a) Probabilistic slip surface
b) Probabilistic wedge
bsf
= dip angle of the slope face [°]
bss = dip angle of the slip
surface [°]
do = distance between the slope crest and the slip surface
[m] or [ft]
a = width of the rock compartement [m] or [ft]
Smoy = mean surface of the slip surface [m²] or
[ft²]
L = mean spacing of the disontinuity set [m] or [ft]
P(do) = probability that the slip surface crosses the
rock mass completely at a distance of do [%]
Limitation for the angles: bsf ³ bss
do and P(do) are computed following JABOYEDOFF ET AL. (1996) :
bsf = 90°
bss = 45°
a = 30 m
Smoy = 1000 m²
L = 10 m
do = 16.67 m
P(16.67) = 81.11 %
d1,2
= distances between the slope crest and the slip surfaces º mean spacings of
the discontinuties [m] or [ft]
a1,2,sf = dip direction of
the slip surfaces 1 and 2, and of the slope face [°]
b1,2,sf = dip angle of the
slip surfaces 1 and 2, and of the slope face [°]
h = height of emergence of the intersection line [m] or [ft]
d1,2 may be computed using a probabiliy threshold
h is computed following JABOYEDOFF ET AL. (1996)
d1 = 2 m
d2 = 1 m
a1 = 018°
b1 = 70°
a2 = 052°
b2 = 47°
asf = 045°
bsf = 65°
h = 1.746 m
d1 = 10 m
d2 = 8 m
a1 = 237°
b1 = 25°
a2 = 352°
b2 = 18°
asf = 025°
bsf = 65°
h = 20.623 m