基于瞬变电磁法的陇东煤矿采空区水文地质勘探技术研究

Hydrogeological Exploration Technology for the Longdong Coal Mine Goaf Based on the Transient Electromagnetic Method

煤矿开采会破坏地层地质结构,造成采空区地表断裂、下沉塌陷等危害。为避免这一问题,需准确探测煤矿采空区水文地质,为此提出基于瞬变电磁法的煤矿采空区水文地质勘探技术。该方法以甘肃省陇东煤矿采空区水文地质为主,分别分析了甘肃省煤矿采空区的地形地貌、地层岩性、水文地质特征,根据分析结果估算瞬变电磁法在水文地质勘探时的最大勘探深度,确定瞬变电磁法的工作参数。依据勘探结果确定煤矿采空区水文地质的异常范围,以此实现煤矿采空区水文地质勘探研究。在实际应用中有效探测出了地层塌陷位置发生高阻半闭合异常现象,且除高压线外煤矿采空区其余位置的干扰电压较小。

Coal mining can damage the geological structures of the strata,causing hazards such as surface fractures and subsidence in goaf areas.To avoid this problem,it is necessary to accurately detect the hydrogeology of goaf areas in coal mines.Therefore,a hydrogeological exploration technology based on the transient electromagnetic method is proposed for goaf areas in coal mines.This method focuses on the hydrogeology of the Longdong coal mine goafs in Gansu Province,and analyzed the terrain,lithology,and hydrogeological characteristics of the goafs.Based on the analysis results,the maximum exploration depth of the transient electromagnetic method in hydrogeological exploration is estimated,the working parameters of the transient electromagnetic method are determined,and the abnormal range of hydrogeology in coal mine goafs is determined based on the exploration results,in orde to achieve hydrogeological exploration research in coal mine goaf areas.In practical applications,it has effectively detected the occurrence of high resistance semi-closed anomaly at the location of strata collapse,and the interference voltage at other positions in the coal mine goaf except for the high-voltage line is relatively small.