洛河组含水层下厚煤层开采导水裂隙带高度探测与分析

Detection of Water Flowing Fracture during Thick Coal Seam Mining in Tingnan Coal Mine under Luohe Aquifer

以亭南煤矿二盘区巨厚洛河组下开采条件为背景,采用理论和工程探测方法,对不同工作面采厚情况下采动覆岩导水裂隙的发育特征进行了探测和分析。研究结果表明,在204面采高6m条件下,实探导水裂隙带高度为144. 0m;206工作面采放总厚度7. 5m情况下,实探导水裂隙带高度为140. 2m;206工作面采放总厚度9m情况下,实探导高为148. 3m,导水裂隙带高度并没有因采高的变化而明显变化,均至宜君组底界附近,同时受控于覆岩中关键层的位置。实测结果也验证了基于关键位置的导高判别方法的正确性及其在亭南煤矿巨厚洛河组覆岩条件下的适用性。研究成果可为亭南煤矿后续盘区合理采放高度设计和顶板水防治提供参考和借鉴。

According to the mining condition of extra-thick Luohe Aquifer,the development characteristics of water flowing fracture during thick coal seam mining in Tingnan Coal Mine with different mining height was studied using actual measurement and theoretical analysis.The results show that,the measured value of water flowing fracture zone in No.204 working face was144.0 m when the mining height is 6 m,which is 140.2 m when the mining height is 7.5 m in No.206 working face,and148.3 m when the mining height is 9.0 m.The water flowing fracture develops near the bottom of Yijun Aquifer.The water flowing fracture does not increase linearly with the increase of mining height,but is controlled by the location of key stratum in overburden.Measured results also verify that the discriminant method based on theory is correct,thus it is applicable in Tingnan Coal Mine.The research results can provide references for reasonable design of mining height and roof water prevention for the mining of other panel in Tingnan Coal Mine.