Characteristics And Prevention Measures Of Surface Subsidence Disaster Of Thick Coal Seam In Chenjiagou Coal Mine

The special geological condition of the three mining area of Chenjiagou coal mine,coal mining of ultra thick coal seam,using stratified caving mining,surface for mountain surface,after mining subsidence disaster is serious,mainly for the failure zone level larger crack,sometimes accompanied by landslide surface generation.In this paper,three mining area of Chenjiagou coal mine 3201,3202,3203,3204 and four working face mining surface movement and deformation as the research object,based on the analysis of the geological conditions of mining,the establishment of the land surface movement observation station of surface movement observation and analysis of surface movement rules and characteristics of subsidence disaster.In order to effect of thick coal seam fully mechanized caving mining subsidence damage on the surface of the order,the application of FLAC3D numerical simulation calculation and analysis of the multi section layered surface deformation from the wrong downward mining section and two layered downward m ining mining sequence,analysis the result of simulation,the multi section layered stagger down Mining order,than the impact on surface mining sequence section layered down smaller,multi section layered stagger descending mining sequence,the completion stage of overlying strata and surface subsidence deformation,can effectively avoid the destruction of the superposition of surface deformation,reduce the damage degree of surface subsidence.On the basis of surface movement observation and numerical simulation results,the main influence factors of surface movement and deformation analysis,given the thick coal seam fully mechanized caving mining deformation and subsidence disaster characteristics of surface movement,put forward the application of mining method and the mining order is one fully mechanized caving mining deformation and subsidence disaster characteristics of surface movement,put forward the application of mining method and the mining order is one of the effective ways to reduce subsidence,making surface sink The basic countermeasures of subsidence disaster,provide a reference for coal mine safety.