Numerical Tests on Changing Behavior of Zonal Disintegration Configuration within Rockmass around Deep Excavated Tunnel

摘要

Zonal disintegration within rockmass around deep excavated tunnel is a scientific characteristic phenomenon which is different from failure mode of shallow tunnel. To study changing behavior of zonal disintegration configuration within rockmass around deep excavated tunnel will help provide some basis for deep tunnel design and construction. In the paper, numerical tests on three-dimensional failure process of rock samples containing semi-arched tunnel with vertical walls is carried out with RFPA-Parallel system running on Lenovo 1800 Cluster, reproducing zonal disintegration phenomenon within rockmass around deep tunnels, and changing behavior of zonal disintegration configuration within rockmass around deep excavated tunnel is analyzed. Numerical results indicate that zonal disintegration configuration including the damage extent, localized damage distribution and deformation within rockmass occur some time later after the excavation. Therefore, the effective supporting time of deep tunnel should take into account the time-lagged behavior. This research will provide some insights in further understanding the mechanism of zonal disintegration of deep tunnel and establishing new method on excavation design and safety evaluation of deep tunnel.