晋城矿区矿井瞬变电磁超前探测特征研究

Features of Advance Detection by Transient Electromagnetic Method in Jincheng Mining Area

通过对晋城矿区各个煤矿现有的超前探测成果进行分析,结合晋城矿区的地质情况及相应探测试验,总结了晋城矿区矿井瞬变电磁在巷道超前探测中的特点,分析了不同地质条件及不同干扰因素下矿井瞬变电磁法的数据及成果特征。结果表明:晋城矿区同区域煤层最大视电阻率值比岩层最大视电阻率值高约200Ω·m;大型断层构造区的视电阻率值不仅和断层导水性有关,还受断层构造区岩体破碎程度的影响;向斜轴部区域的煤岩整体性会随着巷道的掘进发生破坏,从而导致视电阻率值的剧烈变化。该研究为晋城矿区巷道超前掘进探测积累了经验,有助于技术人员提高矿井瞬变电磁法成果解译准确率。

Based on the analysis of advanced detection results from various coal mines in the Jincheng mining area,combined with the geological conditions of the mining area and corresponding detection tests,this paper summarizes the features of the transient electromagnetic method in roadway advance detection.It also analyzes the data and result features of the transient electromagnetic method under different geological conditions and interference factors.The results show that the maximum apparent resistivity of coal seams in Jincheng mining area is higher than that of rock layers by about 200Ω·m.The apparent resistivity in large fault structure areas is not only related to the water conductivity of the fault but also affected by the degree of rock mass fracture.The integrity of coal and rock in the synclinal axis area will be destroyed with the roadway excavation,resulting in drastic changes in apparent resistivity.This study has accumulated experience in the advance detection of roadways in Jincheng mining area,which is helpful for technicians to improve the interpretation accuracy of the transient electromagnetic results.