Study on Overburden Strata Structure Features and Stress Distribution Law of Coal Pillar in Inclined Seam

In order to study overburden strata structure and the stress distribution law of the coal pillar in inclined seam, a theoretical analysis, numerical simulatio n and the site measuring method were applied to analyze the inclined strata movement features of the mining face in inclined seam and the relationship between the se am inclination angle and the coal pillar stress. The results showed that the immediate roof strata at the edge of the inclined seam pillar were not falling all mostly. When the roof strata broken, small structure model would be formed in a series arrangement, the stability was poor and the stability lost failure would provide the spaces for t he main roof movement. Thus large structure model of the main roof was formed and the formation of the large structure model was lagging behind the small structure model. There was a difference between the large structure model and the small structure model in the space. The vertical stress concentrated degree of the sectional C oal pillar would be reduced with the seam inclination angle increased and the horizontal stress concentration degree would be increased with the seam inclination incre ased. A distance of stress peak to the coal wall and the support pressure influence scope would be reduced with the inclination angle increased.