부산대학교 도서관

One of the complexities of rock engineering is predicting the fracture, especially in cases where the rock material exhibits anisotropy in both elastic and fracture properties. In this study, a fracture criterion based on a stress averaging procedure using a combination of the extended finite element method (XFEM) and the cohesive zone model (CZM) is proposed to predict the fracture growth in anisotropic rocks subjected to mixed mode I/II loadings. The precision of the proposed model is scrutinized by comparing its predictions for fracture load, fracture initiation angle and fracture path with the experimental results conducted on Grimsel granite. Finally, a discussion is presented on the effects of the important model parameters such as the mesh size dependency and the radius of the averaging zone. The proposed model is proven to be robust and reveals very good estimations for fracture parameters. Highlights: Nonlocal XFEM-CZM has been developed to model mixed-mode I/II fracture in anisotropic rocks. A combination of the anisotropic MTS and bilinear TSL was used in the damage model. The model is proven to be appropriate for studying brittle fracture in anisotropic rocks. The proposed nonlocal approach is negligibly dependent on mesh size and pattern. The model was verified by the results from fracture tests on Grimsel granite of various configurations. [ABSTRACT FROM AUTHOR]