VARIATION REGULARITY OF ADDITIONAL STRESS TO ROCK MASS IN THE BACK OF SHAFT WALL UNDER MINING EFFECT

By studying the distribution of shaft stress measured in a coal mine in detail, this paper deals with the variation regularity of 3-D additional stress of rockmass in the back of shaft wall with the advance of working face. The result indicates that the rock mass in the back of the upper part of shaft wall has undergone verticlal.And the properties and amplitude of stress of rock mass in the back of shaft wall at the bottom are related with layout of working face, mining sequence, and distance of the working face to shaft.