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In order to study the forming process, development trend and failure pattern of plastic zone in surrounding rock of stope roof with variable length, the analytical formula of the radius plastic zone, tangential stress and radial stress of surrounding rock were derived by using the limit equilibrium theory of elastic plastic mechanics. Based on the numerical simulation software, the space-time evolution rules of plastic zone gradual destruction in surrounding rock of stope roof with variable length was studied. Research shows that the stability of surrounding rock and the original rock should force, cohesion and internal friction angle is closely related, cutting to stress and radial stress increases with the increase of the cohesion increases, the radius of plastic zone with the cohesion and internal friction angle increases and decreases. Facet mining roof surrounding rock plastic zone formation produced at the initial stage of plastic failure, the development stage of the formation of elliptical partial plastic ring, extended late in the formation of “cyclic damage ring”. Large mining roof surrounding rock plastic zone expansion of space from the shallow to the deep extension transfer, damage range from the lower part to upper part of the vertical extension, the plastic zone shape by circular circle development is the knife shaped and exhibited the gradual failure characteristics under the time and space condition. Keywords-stope with variable length; roof surrounding rock; plastic failure zone; evolution rules

The Space-Time Evolution Rules of Plastic Failure Zone in Surrounding Rock of Stope Roof with Variable Length