Civil Engineering Reference
In-Depth Information
(3.83)
Figure 3.19
Failure criteria for discontinuities of different appearance
This relationship is illustrated in Fig. 3.20, for a given set of shear parameters and three
different values of
σ
3
, in the form of a polar diagram. The plot clearly indicates that
shear failure on intact rock only takes place when
β
1
= 90° -
β
2
is either approximately
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