Stability of Rock Wedges and Excavation Surfaces - Rock Mechanics Based on an Anisotropic Jointed Rock Model - page 306

As an example, the stability against sliding of a 10 m high two-dimensional rock wedge
supported by two discontinuities D1 and D2 with dip angles of β D1 = 75°

loaded by self-weight is investigated using both Janbu's method and the general wedge
method (Fig. 11.16). For the analyses, the computer program GGU-STABILITY
was used. The shear parameters of the discontinuities are assumed as c D1 = c D2 = 0,
φ D1 = 30° and

β D1 = 30° and

φ D2 = 35°. Setting the partial safety factor for the friction angle at

γ φ = 1.25, design values of φ D1,d = 24.8° and φ D2,d = 29.3° are obtained.

Figure 11.16 Two-dimensional rock wedge supported by two discontinuities loaded by
self-weight, stability against sliding