Fig. 5

Relationship between effective mean stress and the maximum shear stress for each sample. The results of single compression tests and pressure stepping tests are indicated by red dots and black dots, respectively. Experimental run numbers of the study of Stipp et al. (2013; C0001E11H-1, C0006E8H-1, and C0008A9H-3) and this study (C0001E6H-1 and C0008C11H-3) are indicated. Blue lines indicate slope in mean, and the maximum shear stresses at critical state