一种煤层顶板富水性快速评价方法

Rapid evaluation method for the water abundance of coal seam roof

煤层开采深度的增加给矿井防治水工作带来了更大的挑战,快速定量化确定含水层富水性成为一个亟待解决的问题.本文在理论分析和数值模拟的基础上,将瞬变电磁法与抽水试验结合,利用多个钻孔抽水试验所得的煤层顶板单位涌水量值与其所对应钻孔附近瞬变电磁法测量所得的煤层顶板视电阻率值建立回归方程,通过回归方程与其余位置视电阻率值,定量估算出其他位置处的拟单位涌水量q,用q定量估计整个测区含水层富水性.研究结果表明:瞬变电磁响应能很好的反映含水低阻层性质的改变.对于复杂含水区域,拟单位涌水量q能够提供更为精细的含水层富水性定量信息.该方法在内蒙古某煤矿进行了探索性试验,实现了对煤层顶板富水性的快速定量评估.

With the depth of Coal mining deppening,it becomes a greater challenge to prevent and control water.Quantitative prediction on the water abundance of coal seam rapid has become a serious problem.Based on the theoretical analysis and numerical simulation,transient electromagnetic method and pumping test are combined in this paper.Using many data of unit inflow of pumping test and apparent resistivity values measured near the borehole by TEM,the regression equation was set up.From the regression equation and the apparent resistivity values of remaining positions,quasi unit inflows at other locations were obtained,which could be used to quantitatively estimate the entire survey area.The result shows transient electromagnetic response can well reflect the changing of the aquifer.For complex aqueous region,finer quantitative information of the water abundance of aquifer can be given by quasi unit inflow.The method have been applied in a coal mine in Inner Mongolia,and achieved rapid quantitative assessment of water richness of coal seam roof.