双巷并行三维电法探测煤层工作面底板富水区

The exploration of two-gateways parallel 3-D electrical technology for water-rich area within coal face floor

在工作面双巷中分别布置电法观测系统,所有电极均布置在巷道底板位置,利用并行电法仪采集电法数据,将双巷各测站采集电法数据进行拼接,联合进行三维电阻率层析成像,得到工作面双巷间底板范围三维电阻率变化情况。根据富水区与正常岩层间的电性差异情况,分析富水区可能的电阻率表现形式,再结合已有地质资料、钻孔涌水及注浆资料,综合分析出工作面底板的富水区及分布范围。对安徽恒源煤电工作面的底板水探测及验证表明,该方法较准确地查明了工作面底板岩层内富水区的分布范围。

The two-gateways three-dimention resistivity technology made full use of the data collected by the parallel electrical instrument from the several survey lines of both gateways,with the electrodes set in the tunnel floor,then,the resistivity variations within a coal face floor were acquired.Based on the electrical property differences between water-rich area and normal strata,the capable resistivity images of water-rich area were analysed in detail.In addition to the known data such as those of geology,water inflow of boreholes,grouting,and so on,the property and distribution ranges of water-rich area could be well found out.The exploration case for water-rich area from the coal face in Hengyuan Coal and Electricity Corporation,yield the apparent zones of relatively lower resistivity area,corresponding to the water-rich area,which was testified by the latter drill exposure.