关键词: PFC, 抗转动线性接触模型, 松散矿岩, 自然安息角

Abstract: In order to match the microscopic parameters of the PFC contact models with the physical and mechanical properties of the loose ore rock,according to the PFC contact models and the characteristics of loose ore rock,it is proposed to adopt the rolling resistance linear model,or combine the rolling resistance linear model,linear model and hertz contact model into the different particles.The methods of calibrating the physical and mechanical properties of the loose ore rock are analyzed,and its advantages and disadvantages are pointed out.It is recommended to use the repose angle numerical test to calibrate the PFC microscopic parameters in accordance with the specific measurement conditions.With the aid of the repose angle numerical tests,the influence of the friction coefficient and rolling resistance coefficient in the rolling resistance linear model on repose angle of rock mass are studied.The results show that with the increase of friction coefficient and rolling resistance coefficient,the repose angle shows a tendency that increases first and then stabilizes.The repose angle range ranges from 22° to 50° in the simulation tests,which is in accord with the repose angle of loose ore rock in the reality.

Key words: PFC, Rolling resistance linear model, Loose ore rock, Repose angle