Figure 9

Rupture modes of sandstone specimens with the two sets of cross-persistent joints for different angles: (a) φA = 0°, φB = 0°; (b) φA = 30°, φB = 0°; (c) φA = 60°, φB = 0°; (d) φA = 90°, φB = 0°.

Rupture modes of sandstone specimens with the two sets of cross-persistent joints for different angles: (a) φA = 0°, φB = 0°; (b) φA = 30°, φB = 0°; (c) φA = 60°, φB = 0°; (d) φA = 90°, φB = 0°.