Deformation Analysis of the Rock Surrounding a Tunnel Excavated through a Gently Dipping Bed

To investigate the deformation and stability of rock surrounding a tunnel excavated through layered rock, three-dimensional numerical simulation was conducted to compare analyze right line YD2K100+560–630 two-stage docking cross-section Yuelongmen Tunnel using ubiquitous joint model. Based on 3-D simulations, following conclusions were drawn: (1) The excavation construction entrance side significantly disturbed exit side, more in steeply dipping layer than gently layer. (2) influence dip angle laminae uplift invert greater vault settlement when oriented perpendicular trend used. (3) When applied inclined laminated there an obvious disturbance both top (less one time diameter face; bottom within 0.5 face with stopping during tunnelling process. against layer, face) process due presence laminae. side. penetrating tunnels, priority should be given direction corresponding layers, temporary support strengthened ensure mass.