Experimental Investigation on Fracture Criterion of Three-Dimensional Mixed Mode Interface Crack for Rock/Concrete

Fracture criterion for rock/concrete bimaterial interface was investigated. Two kinds of rock/concrete bimaterial specimens were designed and fabricated, and three-dimensional mixed mode fracture tests were performed on these specimens. There were three steps in experimental investigation. The stress intensity factors of specimen per unit load with different combinations of KI, KII and KIII, were calculated by the mixed hybrid finite element method. Experiments on three-dimensional mixed mode fracture were conducted to obtain critical load Pcr. Based on stress intensity factor per unit load and critical load, 23 groups of critical stress intensity factors of specimens were calculated, and from which criterion of the three-dimensional mixed mode interface fracture for rock/concrete was derived. The conclusion of this paper can be applied to the fracture analysis of interface between dam and foundation.