隆德煤矿下组煤开拓延深工程涌水量预测

Prediction of water inflow of lower group coal development and extension project in Longde Coal Mine

通过收集、整理隆德煤矿2-2煤层各工作面采空区涌水量数据,分析其涌水量特征,并利用各工作面采空区多年涌水量统计数据归纳总结得出各工作面采空区涌水量的衰减率。利用隆德煤矿实测“两带”观测孔数据,对2-2煤层、3-1煤层冒落带、导水裂缝带发育高度进行计算及分析,并根据相关文件以及保水采煤的要求,对采煤导水裂缝带切穿土层隔水层区波及至松散沙层区域需进行限厚或填充开采,以降低导水裂缝带发育高度;得出2-2煤层上覆直接充水含水层为其煤层上覆正常基岩、风化基岩含水层,3-1煤层的直接充水含水层为2-2煤层采空区积水、3-1煤层与2-2煤层之间基岩含水层。通过2-2煤层、3-1煤层导水裂缝带导通含水层的分析,并采用“大井法”和“水平廊道法”,预测了隆德煤矿2-2煤层以及下组煤3-1煤层涌水量。

By collecting and sorting out the water inflow data of each working face of No.2-2 coal seam in Longde Coal Mine,the characteristics of water inflow are analyzed,and the attenuation rate of water inflow in goaf of each working face is summarized by using the statistical data of water inflow in goaf for many years.Based on the measured“two zones”observation data of Longde Coal Mine,the development height of caving zone and water flowing fractured zone of No.2-2 coal seam and No.3-1 coal seam is calculated and analyzed.According to the relevant documents and the requirements of water conservation coal mining,the thickness limit or filling mining should be carried out to reduce the development height of water flowing fractured zone when the water flowing fractured zone cuts through the water-resisting layer of soil layer and spreads to the loose sand layer.It is concluded that the direct water filling aquifer over the No.2-2 coal seam is the normal bedrock and weathered bedrock aquifer,and the direct water filling aquifer over the No.3-1 coal seam is the water accumulated in the goaf of the No.2-2 coal seam,and the bedrock aquifer between the No.3-1 coal seam and the No.2-2 coal seam.Through the analysis of the water flowing fractured zone of No.2-2 coal seam and No.3-1 coal seam,the water inflow of No.2-2 coal seam and No.3-1 coal seam in Longde Coal Mine was predicted by large well method and horizontal corridor method.