基于颗粒流的层状矿岩细观参数标定研究  

Study on Mesoscopic Parameter Calibration of Layered Ore Rock Based on Particle Flow

作　　者：池秀文[1,2] 谢宇 陈东方[1,2] 汪宗英 邓学翰 赵龙 CHI Xiuwen;XIE Yu;CHEN Dongfang;WANG Zongying;DENG Xuehan;ZHAO Long(School of Resources and Environmental Engineering,Wuhan University of Technology,Wuhan,Hubei 430070,China;Key Laboratory of Mineral Resources Processing and Environment of Hubei Province,Wuhan,Hubei 430070,China;Shandong Gold Ming Co.,Ltd.,Jinan,Shandong 250100,China)

机构地区：[1]武汉理工大学资源与环境工程学院,湖北武汉430070 [2]矿物资源加工与环境湖北省重点实验室,湖北武汉430070 [3]山东黄金矿业股份有限公司,山东济南250100

出　　处：《矿业研究与开发》2022年第10期113-118,共6页Mining Research and Development

基　　金：国家十三五重点研发计划项目(2018YFC0604401);国家自然科学基金项目(51874218).

摘　　要：细观参数的标定对于应用PFC颗粒流软件研究开挖卸荷下层状矿岩破坏机理具有重要意义。为标定颗粒及黏结细观参数,首先开展大量的平面单轴压缩和拉伸数值试验。以颗粒的弹性模量、摩擦系数、刚度比和平行黏结的弹性模量、刚度比、法相黏结强度、黏聚力等为自变量,对岩石的宏观性质进行多元线性回归分析,拟合出岩石单轴抗压强度、抗拉强度、泊松比和弹性模量的回归方程。通过回归方程确定岩石细观参数,在此基础上采用PFC2D软件模拟完整岩石试件单轴压缩试验,对比模拟结果与室内试验结果,二者吻合度较高,验证了岩石宏观力学参数与颗粒及平行黏结细观参数关系式的有效性,揭示了单层矿岩开采过程中顶板裂隙扩展规律,为金属矿山层状矿岩采空区失稳机理与稳定性研究提供了技术支撑。The calibration of mesoscopic parameters is of great significance to study the failure mechanism of layered rock under excavation unloading by using PFC particle flow software.In order to calibrate the microscopic parameters of particles and bonding,a large number of plane uniaxial compression and tensile numerical tests were carried out at first.Taking the elastic modulus,friction coefficient,stiffness ratio of particles and the elastic modulus,stiffness ratio,normal bonding strength and cohesion of parallel bonding as independent variables,the macroscopic properties of rock were analyzed by multiple linear regression analysis,and the regression equations of uniaxial compressive strength,tensile strength,Poisson’s ratio and elastic modulus of rock were fitted.The microscopic parameters of rock were determined by the regression equations.On this basis,the PFC2 D software was used to simulate the uniaxial compression test of complete rock specimens.The comparison between the simulation and the indoor test results shows that the two are in good agreement,which verifies the validity of the relationship between the macroscopic mechanical parameters of rock and the microscopic parameters of particles and parallel bonding.It reveals the law of crack propagation in the roof during the mining of single-layer ore rock,and provides a technical support for the study of instability mechanism and stability of goaf with layered ore rock in metal mines.

关 键 词：层状矿岩 颗粒流 细观参数 数值试验 裂隙扩展 

分 类 号：TD325.3[矿业工程—矿井建设]