The bonded particle model is now often used to simulate the behaviour of rock because it can represent the significant physical behaviour mechanisms in rock. The sensitivity analysis of micro-parameters of using the parallel bond model is conducted in this paper. The calibration is carried out based on the laboratory uniaxial compression test of mixed gneiss. The measured macroscopic properties of Young's modulus, the UCS and Poisson's ratio are compared with the results of uniaxial compression simulation by the generated model. This study shows that the micro-parameters have much effect on the macroscopic properties of rock and the complete stress-strain curve of the mixed gneiss rock sample is predicted well compared with laboratory test with easy visualization of the whole process of crack initiation, growth, coalescence.
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