近距离煤层采空区下工作面防治水技术研究

Research on Water Prevention and Control Technology of Lower Working Face in Short Distance Coal Seam Goaf

针对近距离煤层工作面上覆采空区积水问题,结合陕西汇森煤业凉水井矿431盘区实际开采条件,理论计算431盘区工作面开采导水裂隙及421盘区工作面底板裂隙发育高度,数值模拟43101工作面推进期间导水裂隙带发育的时空演化进程,揭示工作面涌水分布特征,建立掘进期间物探与钻探综合探测及回采期间工作面超前探放水的综合防治水技术体系。结果表明:431盘区工作面导水裂隙能够发育至4-2煤层采空区,421盘区采空区积水通过导水裂隙涌入431盘区工作面;倾向导水裂隙、采空区深部、工作面侧走向导水裂隙为首采工作面涌水主要通道。现场工业性试验表明,工作面超前探放水的方法可以有效解决工作面积水治理问题,研究结果可为近距离煤层采空区下防治水提供技术支撑。

For close distance coal seam working face under goaf water problems,combining with the Shaanxi Hui sen Coal Liangshuijing Mine 431 panel actual mining conditions,The development height of mining water-conducting fractures of working face in 431 plate and floor fractures of working face in 421 plate are calculated theoretically.The spatial and temporal evolution process of the development of water conducting fractures zone during the driving period of 43101 working face was simulated to reveal the distribution characteristics of water gushing at the working face,and the comprehensive water prevention and control technology system of geophysical exploration and drilling comprehensive exploration during the driving period and advanced exploration and drainage during the mining period was established.The results show that the water conduction fractures of 431 working face can develop to 4-2 coal seam goaf,and the water of 421 working face floods into 431 working face through the water conduction fractures.The water-conducting fractures,deep goaf and sideway working face conducting water fractures are the main water gushing channel of the first working face.The field industrial test shows that the method of advance exploration and drainage of working face can effectively solve the problem of water control in working face,and the research results can provide technical support for water control in the near coal seam goaf.