A review of the effects of weak interfaces on crack propagation in rock: From phenomenon to mechanism

This article reviews the effect of weak interfaces on crack propagation in rock and some other analogous brittle materials from phenomenon to mechanism. In this review, a variety of fracture patterns (in terms of a propagating crack interacting with a pre-existing interface) are classified, followed by the introduction of some critical influence factors, e.g. strength and toughness of interface, interface angle, interlayer effect, elastic mismatch, dynamic loading, and confining stress. Then, the effects of weak interfaces on the quasi-static and dynamic mechanical behaviors of rock are briefly reviewed. Thereafter, the mechanism of action of weak interfaces on crack propagation in rock is discussed in terms of crack deflection criteria. Finally, some conclusions and outlooks on the research of the effects of weak interfaces on crack propagation in rock are provided.

Automated summary

This article reviews the effect of weak interfaces on crack propagation in rock and similar brittle materials, discussing the phenomenon, mechanism, and classification of influence factors, mechanical behaviors, and action mechanisms.