单轴压缩煤体电阻率变化各向异性实验研究
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摘要
为了研究单轴压缩过程中煤体电阻率变化各向异性特征,分别以0°、30°、60°、90°的取样角度取鲍店气煤做成ф50 mm×100 mm的标准试样,进行电阻率测试,分析总结了鲍店煤样的电阻率变化与各向异性的关系。实验结果表明:鲍店气煤煤样属于离子导电型煤样,电阻率具有明显的各向异性特征,不加载时,离子导电型煤样电阻率随着取样角度增大呈现增大的情况,鲍店气煤煤样垂直层理方向的电阻率小于平行层理方向的电阻率;加载过程中煤样电阻率随着加载而增大,达到峰值强度时煤样破裂,电阻率突降。取样角度β为0°、30°、60°时增长模式为线性增长,取样角度为90°时,电阻率在加载过程中表现为斜"S"曲线增长模式。
In order to study the coal resistivity changing anisotropic properties during uniaxial compression process,Baodian gas coal was drilled at dip angles of 0°,30°,60° and 90° and then made into standard samples with dimension of 50 mm × 100 mm. Coal samples were tested by resistivity testing system,and Baodian coal sample resistivity changing anisotropic properties were analyzed and summarized. The experiment results show that Baodian coal samples belong to ionic conductive coal,significant anisotropy is observed on the specimens' resistivity. Without loading,ionic conductive coal resistivity increases with the growth of sampling angle. The resistivity perpendicular to bedding planes is less than the resistivity parallel; in the loading process,coal resistivity grows with loading process,and coal samples burst along with resistivity falls when it reaches its peak strength. The resistivity growth model for sampling angle β = 0°,30°and 60° is linear increase; while β = 90°,it shows inclined " S" curve growth model in the loading process.
In order to study the coal resistivity changing anisotropic properties during uniaxial compression process,Baodian gas coal was drilled at dip angles of 0°,30°,60° and 90° and then made into standard samples with dimension of 50 mm × 100 mm. Coal samples were tested by resistivity testing system,and Baodian coal sample resistivity changing anisotropic properties were analyzed and summarized. The experiment results show that Baodian coal samples belong to ionic conductive coal,significant anisotropy is observed on the specimens' resistivity. Without loading,ionic conductive coal resistivity increases with the growth of sampling angle. The resistivity perpendicular to bedding planes is less than the resistivity parallel; in the loading process,coal resistivity grows with loading process,and coal samples burst along with resistivity falls when it reaches its peak strength. The resistivity growth model for sampling angle β = 0°,30°and 60° is linear increase; while β = 90°,it shows inclined " S" curve growth model in the loading process.
引文
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[2]王恩元,陈鹏,李忠辉,等.受载煤体全应力-应变过程电阻率响应规律[J].煤炭学报,2014,39(11):2220-2224.
[3]孟磊,刘明举,王云刚.构造煤单轴压缩条件下电阻率变化规律的实验研究[J].煤炭学报,2010,35(12):2028-2032.
[4]孟召平,朱绍军,贾立龙,等.煤工业分析指标与测井参数的相关性及其模型[J].煤田地质与勘探,2011,39(2):1-6.
[5]王云刚.大尺度冲击性煤体电阻率变化规律的实验研究[J].南华大学学报,2010,24(3):15-18.
[6]刘贞堂,贾迎梅,王恩元,等.受载煤体电阻率变化规律研究[J].中国煤炭,2008,34(11):47-49.
[7]徐宏武.煤层电性参数测试及其与煤岩特性关系的研究[J].煤炭科学技术,2005,33(3):42-46.
[8]康建宁.煤的电导率随地应力变化关系的研究[J].河南理工大学学报,2005,24(6):430-433.
[9]陈健杰,江林华,张玉贵,等.不同煤体结构类型煤的导电性质研究[J].煤炭科学技术,2011,39(7):90.
[10]李正川.岩石各向异性的单轴压缩试验研究[J].铁道科学与工程学报,2008,5(3):69-72.
[11]文光才.无线电波透视煤层突出危险性机理的研究[D].徐州:中国矿业大学,2003.
[12]杜云贵,任震,鲜学福,等.煤的各向异性与其大分子结构间的关系[J].煤炭转化,1995,18(4):63-67.
[13]陈季丹,刘子玉.电介质物理学[M].北京:机械工业出版社,1982.