Study on Numerical Simulation on Roof Movement Law of Fully Mechanized Coal Mining Face in Steep Inclined Seam

Based on No. 45051 fully mechanized coal mining face in the steep inclined seam of Xinqiang Mine as an engineering background,the UDEC numerical simulation calculation method was applied to the study on the roof movement law of the coal mining face under the different seam thickness,different inclination and different face length. The study showed that the failure scope of the overburden strata above the coal mining face in the steep inclined seam was mainly at the top of the middle section in the goaf,the top roof was mainly affected by the tensile failure and the floor heave phenomenon in the goaf was obvious. The steeper seam inclination,the high thick seam and the longer coal mining face,the roof movement of the coal mining face in the steep inclined seam would be more serious and the seam inclination would have high influences to the roof movement. The study results would have theoretical guidance significances to the stability control of the surrounding rock and the powered supports in the coal mining face in the steep inclined seam.