In order to investigate the variation regularity of coal mass electrical resistivity in a complex stress environment, a real-time testing system of resistivity variation regularities of coal under loading was established in this study. Through this testing system, resistivity variations of coal mass under uniaxial compression, cyclic loading, multi-stage loading, stress relaxation, and creep loading were tested, respectively. Also, field emission scanning electron microscopy (FE-SEM) was carried out on coal mass. Ultimately, the variation characteristics and micro-mechanism of coal mass resistivity under different loading modes were discussed in depth. The research results indicated that the electrical resistivity of the coal mass varies with stress under different loading modes. The results also suggested that there are great correlations between axial stress, axial strain, and resistivity. Furthermore, it was found that the variation regularity of coal mass electrical resistivity changes with the change of pore structure during mechanical loading. Considering the variations of the axial stress and porosity during uniaxial compression, it was also demonstrated that the electrical resistivity of the coal mass is dominated by its pore structure and characteristics.

为了研究复杂应力环境下​​煤质电阻率的变化规律，建立了煤在负载下电阻率变化规律的实时测试系统。通过该测试系统，分别测试了煤质在单轴压缩，循环载荷，多阶段载荷，应力松弛和蠕变载荷下的电阻率变化。另外，对煤块进行了场发射扫描电子显微镜（FE-SEM）。最终，深入讨论了不同加载方式下煤质电阻率的变化特征和微观机制。研究结果表明，在不同加载方式下，煤团的电阻率随应力的变化而变化。结果还表明，轴向应力，轴向应变和电阻率之间存在很大的相关性。进而发现，在机械加载过程中，煤质电阻率的变化规律随孔隙结构的变化而变化。考虑到单轴压缩过程中轴向应力和孔隙率的变化，还表明煤团的电阻率由其孔隙结构和特征决定。