眼前山铁矿矿岩三轴压缩力学特性研究

利用SAM-2000型微机控制岩石三轴试验机,分别对取自眼前山铁矿的磁铁石英岩、绿泥千枚岩以及混合岩进行不同围压下的三轴压缩试验,分析各岩样的力学特性,并比较3种岩样破坏形式的差异。试验结果表明,岩样的三轴抗压强度离散性较大,应用回归诊断、剔除异常点(离群点)分析方法进行了数据处理,获得了拟合程度较好的岩石强度参数;通过分析岩样破坏形态,磁铁石英岩在三轴压缩下的破坏形式主要表现为劈裂破坏,绿泥千枚岩和混合岩的破坏形式主要表现为剪切破坏。

Triaxial Compressive Mechanical Properties of Rock in Yanqianshan Iron Mine

Sam-2000 microcomputer controlled triaxial rock testing machine was used to conduct triaxial compression tests of magnetite quartzite,chlorite phyllite and migmatite respectively under different confining pressures,the mechanical properties of each rock sample were analyzed,and the differences of failure modes of three rock samples were compared.The results show that large discreteness exist among the triaxial compressive strengths of rock specimen.Regression diagnosis and eliminating abnormal points (outliers) analysis method was used for data processing,and rock strength parameters with good fitting degree were obtained.Failure pattern of rock sample was analyzed,and splitting failure was the main form of magnetite quartzite under triaxial compression,and shear failure for chlorite phyllite and mixed rock.