基于参数修正模型的JM矿岩石流变特性模拟  

Simulation of Rheological Properties of Ore Rock in JM Mine Based on Parameter Correction Mode

作　　者：郭燕忠 GUO Yanzhong(Zijin(Xiamen)Engineering Co.,Ltd.,Xiamen,Fujian 361006,China)

机构地区：[1]紫金(厦门)工程设计有限公司,福建厦门市361006

出　　处：《矿业研究与开发》2024年第7期182-190,共9页Mining Research and Development

摘　　要：自然崩落法矿山岩石的流变特性对矿岩崩落规律有着重要影响。为明确JM矿的矿岩流变特性,以现场矿岩试样的流变试验结果为基础,通过分析比较选取合适的本构模型,模拟研究不同参数对矿岩流变特性的影响。结果表明,在Maxwell、广义Kelvin、Burgers-Mohr三种本构模型中,Burgers-Mohr本构模型对JM矿岩石流变试验数据的拟合效果最佳,其拟合相关系数达到了0.986;Burgers-Mohr本构模型中Kelvin剪切模量主要影响岩石等速蠕变的起始量以及进入等速蠕变所需要的时间,Kelvin黏滞系数主要影响岩石初始蠕变速率,Maxwell剪切模量主要影响岩石流变的瞬时变形量,Maxwell黏滞系数主要影响岩石等速蠕变阶段的起始量以及等速蠕变阶段曲线的斜率。在不考虑削帮工程的影响以及基建期崩落量的情况下,模拟得到了上覆矿岩平均年崩落量为17.6×10^(6)t,与设计年产能18×10^(6)t接近,验证了修正后的Burgers-Mohr流变模型参数的正确性。研究成果可为相似地质条件下的自然崩落法矿山矿岩崩落规律研究提供有益参考。The rheological properties of ore rock in natural caving method have an important influence on the law of ore rock caving.In order to clarify the rheological properties of ore rock in JM Mine,based on the rheological test results of on-site ore rock samples,the appropriate constitutive model was selected through analysis and comparison,and the influences of different parameters on the rheological properties of ore rock were simulated.The results show that among the three constitutive models of Maxwell,generalized Kelvin and Burgers-Mohr,the Burgers-Mohr constitutive model has the best fitting effect on the rheological test data of ore rock in JM Mine,and its fitting correlation coefficient reaches 0.986.The Kelvin shear modulus in the Burgers-Mohr constitutive model mainly affects the initial amount of rock steady creep and the time required to enter the steady creep stage.The Kelvin viscosity coefficient mainly affects the initial creep rate of rock.The Maxwell shear modulus mainly affects the instantaneous deformation of rock rheology.The Maxwell viscosity coefficient mainly affects the initial amount of rock steady creep stage and the slope of the creep stage curve.Without considering the influence of the cutting project and the caving amount during the construction period,the average annual caving amount of the overlying ore rock is 17.6×10^(6) t,which is close to the designed annual production capacity of 18 ×10^(6)t,which verifies the correctness of the parameters in corrected Burgers-Mohr rheological model.The research results can provide an useful reference for studying the law of ore rock caving of natural caving method under similar geological conditions.

关 键 词：自然崩落法 流变特性 参数修正模型 矿岩崩落规律 数值模拟 

分 类 号：TD853.364[矿业工程—金属矿开采]