Investigation on Crack Coalescence Behaviors for Granite Containing Two Flaws Induced by Cyclic Freeze-Thaw and Uniaxial Deformation in Beizhan Iron Mining, Xinjing, China

Table 4

Crack propagation and coalescence for the samples with an inclination flaw of 70°.

Failure morphology
Crack coalescence patterns	(i) Tensile crack was initiated from the right tip of the inclined flaw; (ii) No cracks between the left tip of the inclined flaw and the left tip of the horizontal flaw; (iii) Shielding of the horizontal flaw against vertical stress; (iv) Plenty of tensile cracks at the rock bridge segment	(i) Tensile cracks were initiated from the right tip of the inclined flaw, one anticrack propagation from the left of the horizontal crack; (ii) Two tensile cracks were initiated from the left tip of the horizontal flaw; (iii) Cracks at the rock bridge segment decreases as F-T cycle increases	(i) Tensile cracks were initiated from the left tip of the inclined flaw and propagated to the left of the horizontal flaw, two anti-cracks propagation from the right of the horizontal crack; (ii) Number of cracks at the rock bridge segment decreases	(i) Tensile cracks were initiated from the left tip of inclined flaw and propagated to the right of the horizontal flaw; (ii) Tensile cracks were imitated from the two tips of the horizontal flaw; (iii) Number of cracks at the rock bridge gets to the minimum