井下瞬变电磁法在底板富水异常区探测中的应用

Application of mine transient electromagnetic method in detecting water anomaly area of floor

介绍了井下瞬变电磁法探测底板富水异常区的原理和视电阻率计算方法及常用回线装置,根据现场地质水文资料,并结合实际巷道工作面操作环境,应用PROTEM EM-47HP系统,采用偶极回线装置,对豫西某矿12031工作面底板进行富水异常区探测,表明了该系统对低阻异常体敏感、定向性好、精度高的特点.利用BETEM后处理软件分析数据,经时间-深度转换,正-反演处理得到底板地层视电阻率断面图,初步确定了存在突水危险的富水异常区域,为下一步钻孔查证提供了依据.

The paper introduces the detecting theory of mine transient electromagnetic method, the computing method of apparent resistivity and common loop devices. According to the in - situ hydrogeophysieal information and in combination with the actual conditions of roadway work face, the water anomaly area of floor at the 12031 work face was detected by the PROTEM EM -47HP system and resutls confirmed that this system pos- sessed the characteristics of the sensitiveness to low resistive anomaly, the well orientation and the high precision. The apparent resistivity section maps of floor were made by the BETEM software analysing data and transforming the apparent resistance - time function to the apparent resistance - depth function, which preliminary ascertained the anomaly area occurring water inrush and offered the foundation to check through borehole in future.