单轴压缩煤体电阻率变化各向异性实验研究
Experimental Study on Coal Resistivity Changing Anisotropy During Uniaxial Compression
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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50 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。Abstract: 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.
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Keywords:
- uniaxial compression /
- anisotropy /
- coal resistivity /
- ionic conduction /
- electrical prospecting
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