模拟矿岩散体的PFC细观参数标定方法  

Calibration Methods of the PFC Microscopic Parameters for Simulating the Loose Ore Rock

作　　者：刘欢[1] 任凤玉[1] 何荣兴[1] 李广辉 

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819

出　　处：《金属矿山》2018年第1期37-41,共5页Metal Mine

基　　金：国家自然科学基金重点项目(编号:51534003);国家自然科学基金青年项目(编号:51404065)

摘　　要：为了将PFC接触本构模型中细观参数与矿岩散体的物理力学性质相比配,依据PFC接触本构模型以及矿岩散体本身的特点,提出采用抗转动线性接触模型或将抗转动线性接触模型、线性接触模型和赫兹接触模型组合应用并分别赋予不同性质的散体颗粒。分析了标定矿岩散体物理力学性质的方法及其优缺点,推荐采用与测定条件相符合的自然安息角数值试验来标定PFC细观参数。借助自然安息角数值试验,研究了抗转动线性接触模型中摩擦系数和抗转动系数对散体自然安息角的影响。研究表明:随着摩擦系数和抗转动系数的增加,自然安息角均呈现出先增大后趋于稳定的趋势。模拟结果中自然安息角的变化范围为22°~50°,与实际松散矿岩自然安息角相符。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 ana- lyzed, and its advantages and disadvantages are pointed out. It is recommended to use the repose angle numerical test to cali- brate 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 resuhs show that with the increase of friction coefficient and rolling resistance coeffi- cient, 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.

关 键 词：PFC 抗转动线性接触模型 松散矿岩 自然安息角 

分 类 号：TD85[矿业工程—金属矿开采]