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The Photoelastic Analysis of Stress Intensity Factor for Cracks around a Tunnel

Rock bursts are a main geologic hazard in underground engineering processes, such as mining engineering and tunnel excavation, so it has become an important subject for many researchers and engineers. Photoelasticity, which is a nondestructive, whole-field and graphic stress-analysis experimental technique, is widely used for 2-D and 3-D analysis for getting the information of principal stress difference and principal stress direction of samples. In this paper, the effect of the position and orientation of cracks, which is situating inside the surrounding rock mass of a tunnel, on stress intensity factor (SIF) is analyzed. The results show that crack orientations and the load conditions of tunnel affect stress intensity factors significantly.