Key geological issues - Geotechnical Engineering of Dams - page 67

> φ r

α U

α L < φ r

α U

α L

Bedding or major
anisotropy

fault
Bi-Planar Compound Slide

Folded bedding

< φ r

α L

> φ r α U

Curved Compound Slide

α U > φ r

High strength rock mass
buttress

α U

< φ r

α L

Toe Buttress Compound Slide

α U

Complex rupture surface with
multiple steps or undulations

α L

Irregular Compound slide

Figure 2.44. (Continued) Summary of features of large rapid rock landslides - Sheet 2 of 2 (Glastonbury

2002, Glastonbury & Fell 2002c).