钻孔并行电法探测煤层开采覆岩破坏在祁南矿713工作面的应用

Drilling Parallel Electricity Coal Seam Mining Method for Detection of Overburden Rock Destruction in 713 Working Face of Qinan Ore Application

在工作面特定位置布置覆岩破坏观测钻孔,布置孔内电法观测系统,利用矿井并行电法仪采集电法数据,进行电阻率层析成像。通过采动影响前后覆岩变形与破坏区电阻率值变化情况,划分垮落带和导水裂缝带高度。在祁南矿713工作面施工2处覆岩破坏观测钻孔,获得的电阻率变化较好地反映了覆岩变形与破坏的动态发育情况,得到的垮落带和导水裂缝带高度直观可靠,取得了很好的应用效果。

Computerized tomography （CT） of resistivity can be conducted by laying overburden destruction surveying drill -bores at specific locations on the working platform, deploying the in - bore electrical surveying system and making use of the parallel electrical instrument to gather electrical data. By analyzing the covering rock deformation before and after mining and the changes of resistivity value, caving zone and the height of water flowing fractured zone can be determined. Two overburden destruction surveying drill - bores have been laid on the 713 working platform in Qinan Coal Mine to observe the changes of resistivity, which properly reflects the deform- ation of dynamic destruction of covering rock. In addition, the caving zone and the height of water flowing fractured zone obtained from electrical surveying system are very affordable and intuitive, which has been proved to be with excellent application effect.