摘要
Abstract
Based on the engineering background of the large cross-section empty roadway in the fully mechanized mining face with large mining height under the goaf of shallow buried close-distance coal seam,the law of mine pressure behavior during the mining of the fully mechanized mining face with large mining height under the goaf of close-distance coal seam is analyzed by numerical simulation.The roof load of the empty roadway is calculated theoretically,and the large-scale uniaxial compression experiment of the strong pier column is carried out.The experiment shows that the maximum bearing capacity of the 1 000 mm strong pier column is 10 500 kN,the residual strength is 6 000 kN,and the longitudinal total deformation is 250 mm.In the large mining height working face of 2-2 coal seam,the width of the empty roadway is 6 m and the height is 4 m.The high water material strong pier column is adopted to support,the diameter of the pier column is 1000 mm,and the water cement ratio of the high water material is 1∶1.The pier columns in the empty roadway are arranged in 2 columns,with an interval of 3 000 mm×2 600 mm.The field industrial application shows that during the working face passing through the empty roadway,the maximum stress of the pier column is 7 680 kN,the shape of the pier column is intact,and there is no dumping or splitting.The whole empty roadway is stable,and there is no serious deformation and roof leakage.关键词
近距离煤层/大断面空巷/强力墩柱/大采高/浅埋煤层Key words
close distance coal seam/large cross-section empty roadway/strong pier column/large mining height/shallow coal seam分类
矿业与冶金
