低变质原生结构煤电阻率变化规律实验研究

为了研究各个因素对煤电学性质的影响,利用电学方法通过电学参数来反映煤电阻率的变化规律。通过采用自主研制的煤体电阻率测试系统,用实验的方法对大佛寺井田低变质原生结构煤研究了应力作用时间、应力大小、甲烷气体吸附量以及含水率对煤体电阻率的影响。研究结果表明:煤体电阻率随应力作用时间先快速下降,后逐渐趋于稳定;应力越大,电阻率越小,吸附甲烷气体的量越多电阻率下降程度越大;含水率的提高也会造成煤体电阻率下降。最后基于灰色关联法分析了应力大小、应力作用时间、甲烷吸附量、含水率与煤体电阻率变化量的关联情况,从关联度可以看出应力大小是影响煤体电阻率变化的最主要因素。研究结果对于煤的导电特性研究具有一定的参考价值。

Experimental study on the change law of resistivity in the middle-high rank undeformed coal

In order to study the influence of various factors on the electrical properties of coal, electrical methods were used to reflect the variation of resistivity of coal by electrical parameters. Using a self-developed resistivity test system for coal, the effects of stress time, stress size, methane gas adsorption and water content on the resistivity in the middle-high rank undeformed coal were studied by experimental methods. The results show that the resistivity of coal decreases rapidly with the stress time, and then gradually stabilizes; the higher the stress size, the smaller the resistivity; the more the amount of methane gas is adsorbed, the greater the coal resistivity decreases; the increase of water content will also cause the decrease of coal resistivity. Finally, based on the grey correlation analysis method, the relationships between stress size, stress time, methane adsorption, water content and the change in coal resistivity are analyzed. It can be seen from the correlation degree that the stress is the most important factor affecting the change of coal resistivity. The research results have certain reference value for the study of the conductive properties of coal.