Examples of Testing and Monitoring Programs - Rock Mechanics Based on an Anisotropic Jointed Rock Model - page 615

According to the structural model, the leached rock can be subdivided into four classes,
I to IV, with respect to the degree of leaching (Fig. 19.9). On a large scale, however,
these classes can be combined and described by equivalent parameters according to the
homogeneous model as is done in Fig. 19.9. Only in areas with particularly high frac-
tions of class IV consisting of residual silt was the deformation modulus in the stability
analyses reduced from 150 MPa to 80 MPa.