Statistical analysis of the character of acoustic emission for nonlinear dynamical damage in mined out areas supported by composite rock materials

Based on intelligent acoustic emission technique, the dynamical monitoring of material and structure damage of the collapsed areas supported by composite hard rock materials in transport roadways of Linglong gold mine has been carried out. The non equilbrium statistical theory of solid fracture is used to predict the stability and damage process of the main transport roadway at 255 m level. The monitored results are used to seek out the inherent spatial and temporal rule of the fracture and damage, the intrinsic relation between the damage model and the nonlinear characteristic parameters of acoustic emission during the process of tunnel failure. Parametric statistical analysis is also conducted to asses the effect of various factors on the failure process and failure model. It is a matter of great significance for the safe inspection and evaluation of composite rock engineering.