煤矿井下探测中影响不含水断层视电阻率变化的单一主控因素分析

选取晋城矿区典型3号无烟煤试样，在实验室进行单轴加载条件下的电阻率测试实验，并开展矿井瞬变电磁法探测不含水断层现场试验，研究了不含水断层的视电阻率变化特征。结果表明:煤样加载全过程，经过压密阶段、弹性变形阶段、塑性变形阶段、峰值后破裂阶段、残余变形阶段5个阶段；煤样应力应变曲线表现为由低到高再到低的特征，煤样电阻率曲线表现为由高到低再到高的特征；加载过程中，压密阶段、弹性变形阶段应力越大电阻率越小，应力为影响电阻率变化的主控因素；塑性变形阶段，电阻率先减小后增大，应力和裂隙共同影响电阻率变化，由应力为主要因素逐渐转变到裂隙为主要因素；峰值后破裂阶段和残余变形阶段电阻率急速增大，裂隙为影响电阻率变化的主控因素；通过瞬变电磁法探测不含水断层试验，发现不含水断层导致视电阻率明显升高，表明裂隙为影响断层视电阻率单一变化的主要因素。

Analysis of single main controlling factor affecting change of apparent resistivity of water-free faults in underground coal mine exploration

A typical No.3 anthracite sample from Jincheng mining area was selected，and the resistivity test experiment under uniaxial loading was carried out in the laboratory，and the mine transient electromagnetic method was used to detect the water-free fault field test，and the apparent resistivity change characteristics of the water-free fault were studied.The results showed that the whole process of coal sample loading had five stages:compaction stage，elastic deformation stage，plastic deformation stage，post-peak rupture stage and residual deformation stage；the stress-strain curve of the coal sample showed a characteristic from low to high to low.The resistivity curve of the coal sample showed the characteristics from high to low to high；during the loading process，the greater the stress in the compaction stage and the elastic deformation stage，the smaller the resistivity.The stress was the main controlling factor affecting the resistivity change；in the stage，the resistivity first decreases and then increases.Stress and cracks together affected the change of resistivity，gradually changing from stress as the main factor to crack as the main factor；the resistivity increased rapidly in the rupture stage and residual deformation stage after the peak，and the crack affected the resistance.The main controlling factor of the change of the apparent resistivity；through the transient electromagnetic method to detect the water-free fault test，it was found that the water-free fault causes the apparent resistivity to increase significantly，indicating that the fracture was the main factor affecting the single change of the apparent resistivity of the fault.