Study of forecast of rock burst based on three dimensional in-situ stress measurement

In rock burst forecast tangential stress.. is a dynamic index closely related to initial in-situ stress field. According to the results of three-dimensional in-situ stress measurement and occurrence features of multilayer rockmass in Kaiyang Phosphate Mine, some problems of surrounding rock property, space tunnel, inclined bedding, etc. influenced tangential stress.. are analyzed. Its initial in-situ stress field shows that the measurement values in sand stone is about 3 times larger than that of red shale though red shale is buried deeper than sandstone. Considering the lithology of measuring points, the viewpoint of region application of initial in-situ stress field is accordingly proposed; similarly, the space decomposition method of in-situ stress is correspondingly put forward to adapt to the spatiality of laneway axial direction. According to above-mentioned methods, numerical simulation indicates that when inclined bedding is taken into account rock burst location is mainly side foot which almost accords with the rock burst in field. Rock burst forecast by region application and space decomposition method is closer to actual case than by linear fitting regression method.