采煤面覆岩破坏视电阻率动态变化分析

Dynamic Change Analysis of Apparent Resistivity of Overburden Failure in Mining Workface

指出了确定煤层开采后覆岩破坏高度和发育规律,对矿井的安全开采和防治灾害措施的制定具有重要的意义。通过在井下布置地电场观测系统,利用电阻率法对覆岩变形与破坏发育特征进行了动态观测研究,根据视电阻率动态变化特征,来确定顶板导水裂隙带和垮落带高度。实测结果表明:测试工作面采动应力超前作用范围为60m,垮落带高度为21m,导水裂隙带高度为106m。该研究成果可以较为清晰地判断出岩层结构破坏及裂隙发育,能较为准确地划定覆岩垮落带和裂隙带的范围,可为矿井的安全开采提供保障。

Determining the height and development pattern of overburden failure after the coal seam mining is of great significance for the safe mining of mines and the development of disaster prevention measures.In this paper,the geoelectric field observation system is arranged underground,and the resistivity method is used to study the deformation and failure characteristics of overburden.According to the dynamic variation characteristics of apparent resistivity, the water flowing fractured zone and the height of the caving zone of the roof are determined.The measured results show that the pre-existing range of the test face is 60m;the height of caving zone is 21m and the height of water flowing fractured zone is 106m.The research results can clearly judge the structural damage and fracture development of the rock stratum,and can accurately define the range of the overburden strata and fissure zone,which provides guarantee for the safe mining of the mine.