Research on Zonal Disintegration Characteristics and Failure Mechanisms of Deep Tunnel in Jointed Rock Mass with Strength Reduction Method

To understand the fracture features of zonal disintegration and reveal failure mechanisms circle tunnels excavated in deep jointed rock masses, a series three-dimensional heterogeneous models considering varying joint dip angles are established. The strength reduction method is embedded RFPA to achieve gradual process, macro mode safety factor, reproduce characteristic phenomenon i.e., disintegration. mechanical acoustic emission energy surrounding rocks during different stages whole formation process affected by different-dip-angle joints randomly distributed further discussed. results demonstrate that induced stress redistribution, which significantly from mechanism traditional loose zone; angle set has great influence on buildup, shadow transfer as well mass; existence parallel random lead newly formed cracks near tunnel surface developing along their strikes; make pattern much more complex regional composition. These will greatly improve our understanding engineering.