The invention discloses an isolated-section grouting filling
coal-mining method for mining
overburden rock, which comprises the following steps of: dividing the mining area into a plurality of
coal faces, arranging isolation
coal pillars among the coal faces; drilling a plurality of groups of inlet wells above the plurality of coal faces towards a coal
bed direction, wherein each group of inlet wells are provided with a primary inlet well and a secondary inlet well, and the final hole depth of the primary inlet well is 15-40 times higher than the coal
bed mining height above the coal
bed; the final hole depth of the secondary inlet well is located at 30-50m place above the final hole depth of the primary inlet well; and when the coal face is mined to 10-30m from the primary or secondary inlet well, injecting coal ash
slurry in
abscission zones in the rock strata above the coal face until finishing isolated-section grouting filling
coal mining in the mining area. The method is fit for
coal mining under buildings with a high
recovery ratio, small interference to filling and
coal mining, low filling cost and
good control effect to sink, and can facilitate coal mining without village migration under sufficient mining conditions.