Engineering Rock Mechanics

Foundation instabilij. 307

IP

Figure 17.22 Radial stress contours produced using Bray's solution for an equiva-

lent anisotropic medium, with the plane of anisotropy at angles as shown (from

Goodman, 1989).

but also significantly sideways. Thus an understanding, even only in
terms of qualitative trends, of the extent of the stress distribution within
the rock will lead to the design of more appropriate site investigation
procedures-because the effect of any proximate ground weaknesses must
be evaluated.