Study On Surface Subsidence Law Of Unstable Coal Seam In Laojuntang Coal Mine Coal Mine

Surface subsidence induced by coal mining causes damage to surface buildings. It is of important significance to control subsidence, reduce mining damage and protect surface buildings by studying the laws of strata and surface movements caused by unstable coal seam extraction.This paper takes 21081 working face as the research object and measures the surface subsidence caused by unstable coal seam extraction through establishing observation station. The angel parameters of surface movement and deformation got by calculating depends on measured data,predicting parameters of probability integral method also got based on Matlab.The anticipation of surface movement and deformation was made by probability integral method after working face extraction Mining impact assessment of surface buildings was made based on the expected results.and mining technical measures under the shaft and protection of buildings technical measures was put forward.This paper takes the geological and mining conditions of Laojuntang coal mine as the prototype, establishes a numerical simulation model by using numerical simulation software FLAC3D,and studies the laws of surface movement and deformation of different mining thickness?depth and advance rate.This study has certain instructional significance to improve the recovery rate of coal resources,reduce the mining damage and protect the surface buildings...