Site Investigation - Rock Mechanics Based on an Anisotropic Jointed Rock Model - page 399

Figure 13.33 Schmidt contour diagram of measured discontinuities (Wittke 1990)

Fig. 13.34 shows the results of a probabilistic evaluation of the two mappings with
respect to spacing and trace lengths of the discontinuities of set D2. From this, the
frequency distribution of 167 spacing measurements can be described by a negative
exponential distribution with mean value and standard deviation of 1 m (Fig. 13.34,
above). The frequency distribution of the 86 trace length measurements approximately
follows a beta distribution with mean value of

= 4 m and standard deviation of

= 2 m (Fig. 13.34, below).
The results of these and further mappings, as well as the results of various other site
investigations such as core drillings, led to the structural model depicted in Fig. 13.35
already described in Section 2.7.3 (Fig. 2.36).