煤矿井下瞬变电磁法探测煤层上覆采空区积水实践

Exploration of overlying goaf water of coal seam based on transient electromagnetic method in coal mine

为有效掌握陕西神木某煤矿431303工作面4-3煤层上覆采空区的富水情况,在井下巷道内采用瞬变电磁技术进行顶板含水性探测。在总结已有地质、水文特征的基础上,设计合理的工作参数取得了高质量数据,应用全空间数据处理获得了距巷道顶板100 m范围的介质电性结构,结合煤层、围岩与裂隙带、富水区电性差异的地球物理特性圈定了采空积水异常区3处,且在钻探中得到很好的验证。应用结果表明,通过合理设计施工参数装置、严格采集及数据处理,井下瞬变电磁可以取得可靠的采空积水区探测结果。

In order to know the water enrichment conditions of the overlying goaf of the 4-3 coal seam on the 431303 working face in a coal mine of Shenmu,Shaanxi,the roof water-bearing characteristics is explored using transient electromagnet method in the mine roadway.Based on the existing geologic and hydrology characteristics,working parameters are reasonably designed for high quality data,and the medium electrical structure at the range of 100 m above the roadway roof is obtained by full spatial data processing.According to the geophysical characteristics of electrical differences in the coal seam,surrounding rock,fracture zone and water enrichment area,three sites of abnormal goaf water are determined,which is verified during drilling exploration.Practical experience shows that reliable results for exploring the goaf water is achieved using the aforementioned method by reasonably designing construction parameters,and strictly collecting and processing data.