Based on the digital image technology and FDEM (combined finite-discrete element method) proposed by Munjiza

the FDEM system is developed

which can identify the interface of different materials from a rock-like cross section photo. This system provides an innovative method for the investigation on mechanical feature and failure mechanism of heterogeneous material such as rock and so on. The system using digital imaging technology acquisition of real rock material microstructure from the rock section of the image

meshing with mature technology

mapped into FDEM computing grid

thus the deficiencies of the original FDEM in considering the material heterogeneity are overcomed. Using this system

conducting numerical simulations of the Brazil split test

real failure processes of granite are visually observed. The simulation results show that

considering the heterogeneity of rock samples exhibiting asymmetric stress distribution

rock microstructure has an important influence on stress distribution and cracks of rock.