Abstract: In this study,the acoustic emission (AE) system was used to monitor the rockburst process,and the acoustic optical-mechanical multiphysics characterization method was creatively used to explore the failure mode,strength deformation and acoustic emission evolution characteristics of the fractured rock under grouting conditions,and the effects of fracture pres sure relief and grouting on the rockburst process and its prevention and control effect were analyzed.The results show that the peak stress of high-energy storage granite after fracture is only about 65% of that of the intact rock sample.Grouting can im prove the compressive strength of the cut rock.The stress concentration is transferred from the cave wall to the depth of the sur rounding rock through the fracture,which induces macroscopic crack propagation,but may cause local instability,thus posing a threat to safety.Therefore,the filling technology is used to prevent and control rockbursts by coordinating the joint cutting and pressure relief method.The strength and cohesiveness of grouting materials have a significant impact on the failure mode of rockbursts,and grouting can alleviate the stress concentration problem generated by the crevice tip,and reduce the strength and failure degree of rockburst to a certain extent.In this study,a true triaxial-single-plane air test system that is closer to the stress characteristics of deep tunnels is constructed,and an experimental method for collaborative explosion control between joints and grouting is proposed,which systematically reveals the coupling mechanism of slitting-induced stress migration,grouting inhibi tion of crack tip stress concentration and the coupling mechanism of the two on the prevention and control of rockbursts,which provides a new experimental basis and method reference for the prevention and control of disasters in underground projects.

Key words: rockburst,grouting,rockburst pit,triaxial compression