Study on Strata Behaviours at Face of Gradient and Thin Coal Seam

Aim at technology problem of roof control on the inclined thin coal seam, basing on inclined thin coal seam of Xinxing mine, activity rule of working surface rock and roof buckling characteristic were researched, through numerical simulation and theoretical analysis method. The results show that the direct roof curved from the area of middle and upper to worked out section, and the caving zone was developed by failure finally, by caving zone falling along the roof, which is asymmetrical shape. The roof pressure of upper was the biggest, lower zone is second, and central section is minimum. With the increment of dip angle of coal seam, the stress of roof increases along the increase of angle inclination. The vertical force reduced on the support, which made strata behaviors and the deflection decrease along advancing direction in working face.