Study On Overlying Strata Movement Law Of Upward Mining In Deep Coal Seams Group Of Kailuan Mine

The first mining area in the deep section of Kailuan Linxi Mine is mined under the conditions of large mining depth,high stress and surface buildings(structures).In order to achieve an orderly connection of mine production,and meet the need of surface buildings(structures)protection,12 coal seam is firstly exploited by the method of upward mining.The mining of 12 coal seam led to structural failure of overlying coal and rock strata.In order to achieve safe mining,it is necessary to study the movement deformation and stress distribution of overlying strata in coal seams.Mine pressure and its control theory is applied,and observation combine with FLAC3 D simulation method is used to study the migration and stress distribution of overlying strata in 12 coal seam.Taking the 1021-2 working face of the first mining area in the deep section of Linxi Mine as the engineering background,firstly,the physical and mechanical properties of the coal seam and the top floor coal rock are tested,and the roof is classified.Secondly,field observation combined with numerical simulation results is used to divide the height of the ―three zones‖ of the overlying strata after the mining,and the height of the fallen zone is about 12 m,and the height of the fracture zone is 12～42m.After the 12 coal seams are mined,11 coal seams would not be mined,and other coal seams can be mined.Finally,through the FLAC3 D numerical simulation combine with the field observation,it is concluded that the direct top first weight pace is 40 m,the basic top first weight pace is 60 m,and the basic top periodic weighting pace is 20 m.The research provides a theoretical basis for the feasible development of the deep coal seams group in Linxi Mine,and provide reference for the mining sequence,scheme and process selection of the coal seams to be mined.This research also can realize the efficient use of resources and continuing the coal mine production service period and achieve safe and efficient mining.At the same time,it provides reference for coal mining with similar geological conditions.Figure 47;Table 29;Reference 53...