Quantitative prediction and evaluation on the regularity of asymmetric damage and distortion upon broken rock mass roadways

Based on the comprehensive investigation of characteristics of the regional seismic geology, the spatial variability of rock properties, mining technical conditions and supporting patterns, the deformation and failure modes of broken rock mass roadways were quantitatively analyzed by FLAC^3D numerical modeling. It is shown that the fracture depth in the roof, the strength of fractured rock mass and the rationality of supporting patterns have remarkable influences on the stability of the roadways. The analysis results are good consistent with the field monitoring ones, which indicates that the numerical analysis models are correct. Engineering practice indicated that the co-action of reinforced rock mass in the roof and two wails controlled the influence of asymmetric load and rock strength deterioration in two wails, which led to the reduction in asymmetric deformation, squeezed wall slipping and roof failing of the roadways.