洛河组含水层下厚煤层开采导水裂隙带高度探测与分析

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。

Development characteristics of water flowing fracture during mining under Luohe aquifer in thick seam in Tingnan coal mine

Aim to reveal development characteristics of water flowing fracture during mining under extra thickness Luohe aquifer in mining thick coal seam in Tingnan coal mine, the law of development characteristics of water flowing fracture with different mining height. Results showed that measured value of water flowing fracture in NO.204 working face was 144.0m with mining height 6 meters, which was 140.2 m with mining height 7.5 meters in NO.206 working face, and 148.3 m with mining height 9.0 meters. The water flowing fracture developed near the bottom of Yijun aquifer, but not directly destroyed Luohe aquifer. The water flowing fracture did not increase linearly with the increase of mining height, but controlled by the location of key stratum in overburden. Measured results also verify that the discriminant method based on theory is correct and its applicability in Tingnan coal mine. The value of water inflow in NO.204, NO.205, NO.206 working faces also did not increase linearly with the increase of mining height also verified that the water flowing fracture did not directly destroyed Luohe aquifer. According to this research, the max mining height of working face could increase to 14 m theoretically and the coal recovery rate can be appropriately increased. The research results can provide reasonable design of mining height and roof water prevention for the mining of other panel in Tingnan coal mine.