RESEARCH ON CALIBRATION OF MICROSCOPIC MECHANICAL PARAMETERS OF ROCK-LIKE MATERIAL IN THREE-DIMENSIONAL PARTICLE FLOW CODE NUMERICAL MODELING

The corresponding relationship between the macroscopic and microscopic mechanical parameters is investigated through numerical simulation method. Based on the results of large number of three-dimensional particle flow code numerical tests, a quick calibration method for calibrating the microscopic mechanical parameters of Rock-like material in PFC3D is proposed, and the reference value of microscopic mechanical parameters are determined by the fitting relationship between the macroscopic and microscopic mechanical parameters. A cylinder numerical model for rock-like material is established according to the proposed micro-parameters. The common triaxial tests for the cylinder model are simulated. The simulated results have a good consistency with the laboratory model triaxial tests, and reliability of the proposed method for microscopic mechanical parameters is validated.