Field Tests - Rock Mechanics Based on an Anisotropic Jointed Rock Model - page 481

Figure 15.17 In-situ triaxial test in transversely isotropic rock mass, layout of test, arrangement of
specimen, loading and measuring devices (Kiehl & Wittke 1983)

Parametric studies by means of three-dimensional fi nite element analyses were carried
out, in which this testing procedure was simulated and the elastic constants were varied
(Kiehl & Wittke 1983). As a result, the fi rst loading stage allows E 1 and

ν 1 from Δ p y and

the corresponding incremental mean strains Δ , Δ and Δ of the specimen to be

determined as follows (Fig. 15.18, upper):

(15.32)

(15.33)