受载煤体电阻率变化规律的实验研究

通过建立受载煤体电阻率变化实时测试系统，分别测试了不同煤体在不同加载方式下不同方向的电阻率变化特征，并对电阻率变化机制进行了探讨。研究结果表明：在加载初期不同煤样电阻率随压力的变化趋势有所不同，但在煤体发生破裂后电阻率均呈现上升趋势；对于同一煤样而言，电阻率随压力的变化趋势是一致的，在不同加载方式下电阻率与应力保持良好的对应性；煤体电阻率呈现明显的各向异性特征，在受载过程中不同方向的电阻率中呈现不同的变化规律；煤体的导电特性和孔隙结构的演化共同决定了电阻率的变化特征。

Experimental study on resistivity variation regularities of loading coal

The real time testing system of resistivity variation regularities of loading coal was established where resistivity variation characteristics of different kinds of coal in different orientations under different loading methods were tested.Besides，resistivity variation mechanism was expounded.The research results indicate that there lies difference in resistivity changing tendency of different coal samples along with pressure’s change in the initial stage of loading.Yet，resistivity shows rising trend without exception after coal fracturing occurs.In view of the same coal sample，the changing tendency of resistivity is in consistent with that of pressure.Under different loading methods，resistivity is in fine parallelism with stress.Furthermore，coal resistivity presents apparent anisotropic characteristics.In the loading process，resistivity in different orientations shows different variation regularities.Meanwhile，the conduction characteristics of coal and evolution of pore structure codetermine the variation characteristics of resistivity.