Mechanical Behavior of 3D Crack Growth in Transparent Rock-Like Material Containing Preexisting Flaws under Compression

Figure 4

Modes of crack coalescence with different rock bridge angles: the inclination angle is about 30°; the frictional coefficient is about 0.577. (a) Showing the early stage of crack coalescence process under uniaxial compression when rock bridge angle is 85°, (a′) showing the failure of the specimen under uniaxial compression when rock bridge angle is 85°; (b) showing the early stage of crack coalescence process under uniaxial compression when rock bridge angle is 110°, (b′) showing the failure of the specimen under uniaxial compression when rock bridge angle is 110°; (c) showing the early stage of crack coalescence process under uniaxial compression when rock bridge angle is 60°, (c′) showing the failure of the specimen under uniaxial compression when rock bridge angle is 60°.