水体下急倾斜煤层开采采空区矸石充填技术

Mined-out Area of Steep Coal Seam Mining under Water Waste Rock Filling Technology

在煤炭开采时当煤层上方直接为水体时,如果不采用充填采空区的方法,那么就会造成矿井水灾影响正常采煤生产。根据龙湖煤矿的补给水源,分析矸石充填的作用机理,实验获得孔隙率与岩体强度关系,根据地质条件确定了整体充填部分注浆的方案。现场实践表明,该方法可抑制顶板下沉和顶板导水裂隙的扩展,缓和工作面支承压力产生的矿压显现,防止矿井突水事故的发生。

When the coal seam in coal mining above directly into water bodies,if we do not adopt the method of filling mined-out area,so will mine flood impact to normal mining production.According to longhu coal supply water,analyses the mechanism of the waste rock filling,experiment,porosity and rock mass strength,according to the geological conditions to determine the overall packing section grouting scheme,field practice shows that this method can suppress roof convergence and roof lead water crack extension,moderate face abutment pressure of mine pressure,to prevent mine water inrush accidents.