矿井掘进工作面富水区多点电源高分辨电法探测

Multipoint sources-based high-resolution electrical detection of the water-rich areas near mining faces of coal mine roadways

为准确探查矿井掘进工作面富水区空间分布,提出了多点电源高分辨电法探测技术。在掘进工作面后方一次布置多道电极观测系统,从掘进工作面向后1/4测线电极依次作为供电点电源电极,采用单极−偶极装置采集数据,得到的视电阻率值视为多点电源电测深数据。利用多点电源电测深成像结果,快速判别掘进工作面是否存在相对富水区,判断富水区是在掘进工作面前方还是后方;将探测范围划分出一系列目标单元,对多点源电测深数据,采用异常目标匹配滤波处理方法,得到探测范围相关度成像结果,其中高相关度值范围准确地反映了掘进工作面前后富水区的分布位置;利用实测多点电源电测深数据拟合一条理论模板曲线,采用比值法校正得到的多点电源测深比值数据能够有效消除巷道空腔及层状地层等因素的影响。在淮南矿业集团潘三矿掘进工作面探测实例表明,多点电源高分辨电法能够准确探查出掘进工作面富水区的位置,有效指导巷道掘进水害防治工作。

To accurately explore the spatial distribution of water-rich areas near mining faces of mine roadways,this study proposed a multipoint sources-based high-resolution electrical detection technology.A multi-channel electrode observation system was arranged behind a roadway mining face,with electrodes at a distance of 1/4 measuring lines behind the mining face as point source electrodes sequentially.Data were collected using a monopole-dipole device,with the obtained apparent resistivity considered the sounding data of multipoint sources-based electrical detection.The images of multipoint sources-based electrical sounding allow for quickly determining the presence of water-rich areas and their locations relative to the mining faces of mine roadways.Specifically,the detection range was divided into a series of target units.Then,the multipoint sources-based electrical sounding data were processed using the matched filtering method for abnormal targets,yielding the correlation imaging results of the detection range.Among them,the ranges of high correlation values can accurately reflect the distribution locations of rich-water areas in front of or behind the roadway heading mining faces.A theoretical template curve was obtained through the fitting of measured electrical sounding data.Subsequently,the multipoint sources-based sounding ratio data obtained using the ratio method can effectively eliminate the influence of factors such as roadway cavities and laminated strata.As indicated by the detection results of a mining face in the Pansan Mine of the Huainan Mining Group,the multipoint sources-based high-resolution electrical method can accurately detect the locations of water-rich areas near the mining faces of mine roadways,thus effectively guiding the prevention and control of water disasters during roadway tunning.