Environmental Engineering Reference
In-Depth Information
Figure 4.2.
Modes of rupture in rocky slope according to [HOE SI]: a) circular slide;
b) sliding on a plane; c) wedge slide; and d) toppling
4.2.1.
Sliding
For a wedge slide, the definition of the safety factor is expressed in the following
way (see Figure 4.3):
tg
φ
β
*
sin
θφ θφ
tg
+
sin
tg
2
1
1
2
F
=
=
[4.1]
(
)
tg
sin
θ
+
sin
θ
tg
β
1
2
where:
φφ: angles of friction on planes 1 and 2;
12
θθ: angles of apparent inclination of planes 1 and 2 in the plane
perpendicular to the line of intersection of the two planes;
12
β: inclination of the line of intersection.
