Preliminary Research on Rules of Underground Pressure Behavior of Full-mechanized Caving Mining Extremely Thick Coal Seam in Tashan Colliery

Behavior of underground pressure during full-mechanized caving mining extremely thick coal seam in Tashan Colliery was very strong.Rules of underground pressure behavior were obtained with observation data.By analyzing causes of strong pressure with geological conditions and equipment utilization status,improvement measures were put forward.Good effect was obtained in practice.