综放工作面采空区“三带”高度分布特征数值模拟研究

Numerical Simulation Study on Distribution Characteristics of "Three Zone" Height in Goaf of Fully-mechanized Caving Face

煤矿开采过程中,岩层遭到破坏,采空区上方出现了明显的"三带"特征,详细掌握岩层"三带"分布规律,有利于较为定量的分析采空区瓦斯赋存和导水裂隙带高度,并能分析采空区对临近工作面及临近巷道的影响,从而为高、低位抽采巷(顶板高、低位钻孔)层位布置,临近工作面及临近巷道布置提供依据。通过对阳煤集团新大地煤矿综放工作面采空区建立覆岩变形破坏数值模型,得出采空区"三带"高度分布规律,从而指导矿井在相似开采条件下选择高、低位抽采巷和顶板高、低位钻孔布置层位,进而取得较好的瓦斯抽采效果。

During the coal mining process,the rock stratum is destroyed,and the obvious"Three Zone"feature appears above the goaf.Mastering the distribution pattern of"three Zone"in rock formations is beneficial to the quantitative analysis of gas occurrence and water-crushing belt height in goaf,and can analyze the influence of goaf on adjacent working face and adjacent roadway,so as to provides a basis for the layout of strata in high and low level extraction roadways(high and low level boreholes in roof),and provides a basis for the layout of the adjacent working face and adjacent roadway.In this paper,a numerical model of overburden deformation and failure in the goaf of the fully-mechanized caving face of the Xindadi Coal Mine of Yangquan Coal Industry Group was established,the distribution law of the"three belts"in the goaf was also obtained,so as to guide the mine to select high and low pumping under similar mining conditions,and to achieve a better gas drainage effect.