煤岩动力灾害的产生与煤岩应力集中息息相关，不同应力状态下煤样电阻率存在着明显的差异。为分析煤样加载破坏过程中各阶段电阻率的变化与损伤规律，建立了煤体电阻率加载测试系统，并进行了不同阶段电阻率−应力相关性及损伤规律分析，得出以下结论：① 煤样电阻率与煤岩应力在不同阶段有着不同的对应关系，在压缩阶段电阻率呈不断减小的趋势，在弹性阶段与塑性阶段电阻率变化速度降低，在破坏阶段随着煤样的破坏发生突增。② 不同煤样在压缩阶段、弹性阶段、塑性阶段的应力−电阻率相关性均大于0.6，表现出强相关性；而在破坏阶段，应力−电阻率相关性小于0.4。③ 电阻率变化率在整个加载过程中分为平稳期与突变期2个部分，在平稳期电阻率变化率波动较小并基本保持一致，在破坏阶段电阻率变化率发生突增。④ 在塑性阶段之前，电阻率取决于煤样基质本身的导电性质；在塑性阶段和破坏阶段则是由孔隙扩展、贯通及断裂破坏引起的。

The occurrence of dynamic disasters is closely related to stress concentration in coal and rock, and coal resistivity varies significantly under different stress states. TTo analyze resistivity variations and damage of coal sample failure under loading, a resistivity loading testing system for coals is developed. Correlation and damage analyses between resistivity and stress at different stages were conducted, leading to the following results: ① the relationship between coal resistivity and stress in coal and rock varied at different stages. Resistivity continuously decreased during the compression stage. The rate of resistivity variation slowed down during the elastic and plastic stages, and it increased sharply during the failure stage. ② The correlation between stress and resistivity exceeded 0.6 during the compression, elastic, and plastic stages, indicating strong correlations. However, during the failure stage, the correlation between stress and resistivity was less than 0.4. ③ The rate of resistivity variation during the entire loading process was divided into two phases: a steady phase with minimal fluctuations and an abrupt phase with a sharp increase in resistivity variation during the failure stage. ④ Before the plastic stage, resistivity was determined by the intrinsic conductivity of the coal matrix. During the plastic and failure stages, resistivity was influenced by pore expansion, permeability, and fracture damage.