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洼里煤矿在山东省黄县煤田中部,设计能力60万吨/年。可采煤层两层,为第三系褐煤,上层与油母页岩伴生,两者厚度为2.1～2.5米,下层平均煤厚为1.4米,两层间距一般为13米。上伏第四系冲积层厚23～60米。高压输电铁塔位于一采区1207工作面上方。工作面平均长度为87米,走向长度285米,煤厚1.5米,倾角5°,垂深92～106米。工作面地质构造简单,运输巷及回风巷掘进时未遇见断层。地面标高+11.8米,冲积层厚度27米,富水性较强(见图1)。回采二层煤,直接顶为灰黑色泥质页岩及砂质页岩,厚9.0米左右,岩性松软,易冒落;底板为灰白色砂岩及砂质粘土岩,厚1.2米,岩性松软,遇水易成粘泥,砂岩中含孔隙水。
Wali Coal Mine in Huang County, Shandong Province in the middle of coal, design capacity of 600000 tons / year. The two layers of the recoverable coal seam are Tertiary lignite, and the upper layers are associated with the oil shale. The thickness of the two layers is 2.1-2.5 meters, and the average coal thickness of the lower layer is 1.4 meters. The interval between two floors is generally 13 meters. Quaternary alluvial layer thickness 23 ~ 60 meters. High-voltage transmission tower located in a mining area above the 1207 face. The average face length of 87 meters, to the length of 285 meters, coal thickness 1.5 meters, dip 5 °, down 92 to 106 meters. Facies geological structure is simple, transportation lane and return airway tunneling did not meet the fault. Ground elevation +11.8 meters, alluvial layer thickness of 27 meters, strong water-rich (see Figure 1). The second coal seam is directly pumped back to the top with gray-black shale and shale with a thickness of about 9.0 meters. The lithology is soft and easy to fall off. The bottom is an off-white sandstone and a sandy clay rock with a thickness of 1.2 meters and soft lithology In case of easy slime into water, sandstone contains pore water.