The simulating experiment of extracting sublayer coal in Muchengjian colliery

Abstract：By using simulating experimental means of similar material, it has indicated the investigation of extracting sublayer coal under abnormal condition and testify caving conditions when extracting toplayer coal in Muchengjian Colliery of Beijing Coal Mining Burea.It has studied the top roof rock seam destabilization and mine pressure showing law when extracting sublayer coal artifical coal seam of top coal remaind and top coal mined.

Keyword：artificial coal seam roof;extract sublayer coal;simulating experiment;