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岩爆预测中常用的动态指标切向应力σθ是与初始地应力场密切联系的。根据开阳磷矿实测三维地应力值和该矿多层岩体赋存的特点,分析了洞室围岩岩性、空间巷道、倾斜层理等因素对σθ的影响。开阳磷三维地应力测试成果表明,埋深浅的砂岩比埋深大的红页岩的垂直地应力值要大近3倍,提出了考虑测点岩性的地应力场区域应用观点和考虑巷道轴向空间性的三维地应力空间分解方法。按上述方法,通过数值模拟研究发现,考虑倾斜层理时发生岩爆的位置主要在右帮底部。这与马路坪矿现场观测的破坏结果较吻合。区域空间分解法的岩爆预测结果比线性拟合回归法更接近实际。
The commonly used dynamic index tangential stress σθ in rock burst prediction is closely related to the initial geostress field. According to the measured three-dimensional in-situ stress of Kaiyang phosphate rock and the occurrence of multi-layered rock mass in the Kaiyang Mine, the influence of surrounding rock lithology, spatial alleyway and inclined bedding on σθ is analyzed. The results of three-dimensional geostrophic test of Kaiyang phosphorite show that the shallow buried sandstone is about three times larger than the vertical stress of the buried red shale. The application of the geostress field considering the lithology of the measuring point and the consideration of the roadway Three Dimensional Spatial Decomposition Method of Axial Spatiality. According to the above method, through numerical simulation, it is found that the location of rockburst when considering inclined bedding is mainly at the bottom of right gang. This is consistent with the observed results of the destruction of the road site in Malu. The results of the rockburst prediction by the regional spatial decomposition method are more realistic than the linear regression method.