Resisting impact mechanical analysis of an anchored roadway supporting structure under P-wave loading and its application in rock burst prevention

Due to resisting impact characteristics of anchored roadway supporting structures not being taken into full consideration in the existing mechanism of roadway dynamic failure, a dynamic analysis model of the bearing structure of rocks surrounding a mine roadway was built and the dynamic action of P-waves was analysed. An expression for additional impact resistance Q d under dynamic loading was proposed and the rock burst criterion for an anchoring roadway supporting structure was given with corresponding prevention measures made. The results show that (1) the action of a P-wave can be divided into five time intervals according to the interaction between the incident, and reflected, P-wave in the elastic zone of the rock surrounding the roadway, (2) the dynamic failure area ( R p − R f ) and dynamic failure time t d of the elastic zone can be obtained, based on the total stress state under the superposition of static and dynamic loads and the Mohr-Coulomb strength criterion, (3) the static cumulative resistance Q s , caused by rock deformation, is the basis of dynamic failure, while the additional impact resistance Q d , which was resulted from the energy release during failure of the elastic zone, is the driver of dynamic failure. Consequently, the dynamic failure of support will occur when the real-time total resistance Q ( Q s + Q d ) is greater than the ultimate resistance Q , and (4) prevention measures can be undertaken by taking pressure-release measures and improving roadway support parameters.