Numerical simulation on oblique sublevel concentration coal mining method of Datai Mine

Based on Datai Mine of Beijing Coal Group as an example, this paper builds up three dimensional finite element model of Ansys software of oblique sublevel concentration coal mining method novelly. The transformations of stress field and displacement field of coal layer roof and floor are calculated. The isoline and relationship curves between stress and displacement and coal layer angles are given out according to numerical simulation. Then we sum up a few new rules that normal direction's stresses and displacements are important characteristic factors, they show the movement laws of coal layer roof and floor. At last dangerous areas and locations where damage is easy to happen are predicted and pointed out for effective prevention.