矿井工作面开采底板破坏规律钻孔电法测试分析

Detection Analysis on the Floor DamageRule from Working Face Mining by Drilling Electrical Method

煤层开采过程中工作面底板岩层变形与破坏特征可利用物探方法进行综合测试与判断。淮南潘北矿3煤层距底板灰岩层较近,现场利用底板巷道布置钻孔电法测试系统,根据煤层开采进度进行实时监测,获得了煤层开采过程中底板岩层电阻率值变化过程参数,结合背景值对比分析获得了岩层破坏特征规律认识。结果表明,该工作面3煤层顶分层开采破坏深度为14.5 m左右,其结果动态、可靠。

The deformation characteristics and failure laws of floor rock of the working face can be detected and judged comprehensively by means of geophysics methods in the process of mining. No. 3 coal seam is close to the floor limestone layer of Panbei mine in Huainan, so the borehole electrical resistivity testing system was ar- ranged in the floor roadway at the scene. The changing procedure parameters of rock stratum resistivity value in the floor of working face during mining are gained according to the real - time monitoring with the coal bed min- ing progress. And the failure characteristics and laws of rock can be contrasted and analyzed with the combina- tion of the background resistivity value of rock in the floor. The inspecting results show that the damage depth of top slice mining of No. 3 coal seam is about 14.5 m, and the obtained result is dynamic and reliable.