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  Figure 9.2a-c : Examples of brittle failure in triaxial test specimens of Ohtawa basalt (Hoshino et al., 1972). a) 0.1 MPa confining pressure. b) 49 MPa confining pressure. c) 98 MPa confining pressure. Note transition from axial splitting to shear fracture to distributed shearing.  
         
 
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