近距离煤层开采顶板采空区积水防治技术研究

Research on prevention and control technology of ponding water in roof goaf in close-range coal seam mining

针对凉水井煤矿43101工作面采掘安全面临顶板4-2煤采空区积水威胁,通过理论分析和现场实测确定巷道掘进塑性区及顶底板破坏深度,评估采空区积水威胁程度。提出了巷道掘进正常超前探放水,工作面回采前超前疏放顶板采空积水的综合防治措施。实施了井下群孔疏放采空积水的技术措施,并从单孔水量、群孔水量、疏放水总量等三个方面分析了疏放水效果,保证了工作面安全回采。

The mining safety of 43101 working face in Liangshuijing coal mine was faced with the threat of ponding in the goaf of 4-2coal seam.By means of theoretical analysis and field measurement,the failure depth of roadway excavation plastic zone and roof and floor were determined,and the threat degree of water accumulation in goaf was evaluated.The normal advance water exploration and drainage in roadway excavation was put forward.Then comprehensive prevention and control measures for draining the water accumulated in the gob of the roof in advance before the mining of the working face were proposed.The technical measures for drainage of gob ponding by underground group holes were implemented,and the drainage effect was analyzed from three aspects to ensure the safe mining of the working face.(i.e.,single hole water volume,group hole water volume and total drainage water volume).