Theory and Applicable of Yield Mining at Ending Stage of Fully-Mechanized Face in Shallow Seam at Shendong Mine Area

According to the problem of support crushing accidents at the ending stage of fully-mecha-nized faces in Shendong mining area,theory analysis and practice method was adapted to research the principle and application of yield mining.The results show that yield mining is a kind of skill that can avoid the influence of ground pressure at ending stage of fully-mechanized faces by stopping mining at a proper position before removing,which can change the starting location and decrease the length of continuous pressure by reducing mining velocity and create a non-pressure surroundings.While the width of interval pillars during yield mining must be determined by taking interval pillars' stability and non-pressure at ending stage as premise.Four probable situations are put forward according to the pressure law before stopping mining and pressure behaviour during stopping mining.Yield mining was successfully used at the ending stage of NO.21305 fully-mechanized face in Daliuta coal mine and NO.22303 fully-mechanized face in Bulianta coal mine which realizing a safe waking face removing.