Abstract
A series of fracture experiments were carried out to study the coupling effects of confining pressure and crack surface friction on the propagation of compression-shear fracture in a self-developed triaxial compartment. Meanwhile, a fracture propagation code (FPC) that can effectively simulate the initiation and propagation of closed cracks was developed for the corresponding numerical research. The results show that the crack of the centrally cracked Brazilian disc (CCBD) specimen is still mainly of tension-shear fracture in a certain range of crack inclination angle under a high confining pressure coefficient. Compared with confining pressure, the influence of crack surface friction on fracture propagation is more prominent after crack closure. In addition, the fracture mode for closed crack is determined by confining pressure, crack surface friction, relative crack length and crack inclination angle.
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