Digital image processing-based Rock Failure Process Analysis code, abbreviated as RFPA2D-DIP, is introduced to simulate progressive failure of circular openings in granite rock. The proposed method incorporates digital image processing technologies and vector transformation methods. The surface image of rock can be directly imported into the code. First, the actual heterogeneity of rock is extracted from the image by DIP function of RFPA. Second, the image characterized meso-structure is automatically transformed into grid data of finite element method. The mesomaterials, composing of rock components, such as mineral grains and flaws, are classified into different material groups according to their colour characteristic and assigned with their own mechanical properties. In this way, the influence of actual mesostructure can be taken into account during the analysis of mechanical response and failure process. Then an image of granite is taken as an example to demonstrate the proposed method. The progressive failure around circular excavation in granite rock, involving initiation, propagation and coalescence of fractures, is simulated by a factitious increasing of in situ stresses. The proposed code is validated by comparing simulated fracturing pattern with those reported in previous studies. Finally, failure mechanisms are identified for different lateral pressure coefficients. The results show that the heterogeneity of rock can play an important role in the failure behaviours of rock under external loading.
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