大倾角仰（俯）采采场顶板的应力分析

In order to study the mechanism of roof break on up-dip & down-dip mining stope at deep dip angle, the paper made a thin plate mechanical model of the roof toward its periodic fracture, analysed the stress distribution and fracture mechanism of the basic roof rock, and built a formula for the extreme limit fracture principle of the thin plate and the stress theory. It found that the tensile stress σx and σy of the model are respectively the key factors of controlling the inclination, trend and the strata behaviour; and distribution characteristics of σy determine conditions of roof break and strata behaviour on up-dip & down-dip mining.