煤层群覆岩裂隙带煤与瓦斯共采协同机制研究

Synergistic mechanism of co-mining coal and gas in overburden strata fissure zone

煤层群采动覆岩裂隙演化与煤炭开采、卸压瓦斯渗流具有内在的联系,为建立煤炭开采与卸压瓦斯抽采(共采)的协同作用机制,阐明了共采协同的内涵,应用协同学理论建立了以单宽工作面煤炭日产量Qm、覆岩裂隙带日扩展体积V和卸压瓦斯涌出量Qg为协同变量的共采系统序参量方程,试验研究了覆岩裂隙垂向与水平扩展特征,建立了裂隙带发育体积演化模型,通过对序参量方程进行线性稳定性分析,建立了协同变量的相互影响机制.以沙曲矿为背景进行了共采协同机制应用研究,构建了24208工作面共采协同变量的相互影响机制.结果表明:裂隙钻孔抽采层位选择裂隙带日扩展体积V曲线拐点位置(距顶板19.5~22.6 m)较为合理.

The evolution of overburden strata fissures under mining conditions is intrinsically linked to coal mining and relief gas seepage.In order to establish the synergetic mechanism of coal mining and relief gas drainage(co-mining),the co-mining synergy was clarified.Taking the single-width face daily coal production Qm,the daily expansion volume V of overlying rock fracture zone and the relief gas emission Qg as synergistic variables,the co-production system order parameter equation was established.The vertical and horizontal spreading characteristics of strata fissures were experimentally studied,and the evolutional model of fissure zone development was established.Through the linear stability analysis of the order parameter equation,the mutual influence mechanism of the variables has been gotten.Based on the Shaqu mine,the application of synergistic mining mechanism was studied,and the interaction between the co-variables was established in 24208 working face.The results show that the location of fracture drilling drainage layer in the inflection point of V curve(from the roof 19.5-22.6 m)is more reasonable.