上限区域浅部煤层保水开采工作面安全推进速度实验研究

基于国内外研究结论,本文以皖北矿区百善煤矿6煤层为研究对象,通过分析浅部煤层保水开采机理和关键,提出以"上覆岩层水体渗流速度确定工作面推进速度"的思路(工作面推进速度能使关键层采后破断的砌体在上部水体渗流到采空区前闭合)。根据渗流理论、经验公式和实测资料等,对保水开采分类中工作面上覆岩层中的潜水渗流时间进行公式推导及计算;根据关键层理论和百善煤矿地质资料,计算出各分类上覆岩层初次和周期破断距。由此,计算和确定出各分类工作面推进速度,同时,以推进速度下限和采煤机切割速度确定安全保水开采的工作面长度范围。进一步完善保水开采技术体系,为浅部煤层保水开采技术的安全应用提供理论指导。

E xperimental Research on Safety Mining Sp eed of Aqu ifer-pr otective Mining Workin g Face in Sh allow Coal Seam at the Upper Limit Area

Based on the domestic and foreign research conclusion and based on the 6 coal seam as the research object, thought of ＂working face advances speed depending on the overlying strata water seepage velocity ＂is proposed by analyzing the mechanism and key of aquifer -protective mining in shallow coal seam （ working face advances speed can make broken key strata body closing before upper water seepage to mined -out area ）.According to the seepage theory and empirical formulas and the measured data etc., seepage time formulas and calculation of ground water in upper strata of working face is made for every classification of aquifer -pro-tective mining.According to the key strata theory and geological data of Wanbei mine area , first or periodic breaking space of overlying strata is calculated for each class.Thus, each classification working face advances speed is calculated and identified.Meanwhile , the safety aquifer-protective mining face length range is de-termined by lower limit promote speed of working face and cutting speed of coal winning machine.The aquifer-protective mining technology system is perfected furthermore , and theoretical guidance is provided for secur-ity applications of shallow seam aquifer -protective mining technology.