Stress-Strain Behavior of Jointed Rock - Rock Mechanics Based on an Anisotropic Jointed Rock Model - page 63

Figure 3.13 Nonlinear failure criterion for rough and uneven discontinuities
Natural discontinuities in sandstone and slate often exhibit marked anisotropic rough-
ness surfaces, as illustrated in Fig. 3.14. Slickensides, which are planar and smooth in
the direction of movement and uneven and rough perpendicular to the same, are an-
other example for anisotropic roughness (cf. Fig. 2.31). As a consequence, the peak
shear strength of such discontinuities is dependent on the shearing direction (Huang &
Doong 1990, Jing et. al. 1992, Kulatilake et al. 1995).
Figure 3.14 Anisotropic roughness of discontinuity surfaces (Kulatilake et al. 1995)