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Research on Anti-seismic Technology of Super Large Section Highway Tunnel in Fault Fracture Zone
(1 College of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074; 2 China Railway Siyuan Survey and Design Group Co., LTD; Wuhan 430063)
Abstract It analyzes the anti-seismic technology of highway tunnel with super large section in fault fracture zone
by 3D finite difference calculation software. Through numerical simulation, the influences of different stiffness of lining structures and grouting reinforcement means on the anti-seismic effet of tunnelling in fault fracture zone are analyzed. The results show that the stress of concrete lining with larger stiffness is larger, and the longitudinal influence range has a tendency of slightly increases; with the decrease of lining stiffness, the decrease trend of maximum principal stress is not linear and has an obvious trend of slow down, and the damping effect becomes less obvious after continuous reduction of lining stiffness; the grouting reinforcement has obvious anti-seismic effect on arch foot and haunch of the super large section tunnel in fault fracture zone, which will improve the condition of force on tunnel lining; the anti-seismic effect of full ring grouting at intervals is better than that of full ring contact grouting; it is
suggested that grouting at intervals of 1 m and 4 m in thickness should be adopted at the fault fracture zone of the super large section tunnel.
Abstract：
It analyzes the anti-seismic technology of highway tunnel with super large section in fault fracture zone
by 3D finite difference calculation software. Through numerical simulation, the influences of different stiffness of lining structures and grouting reinforcement means on the anti-seismic effet of tunnelling in fault fracture zone are analyzed. The results show that the stress of concrete lining with larger stiffness is larger, and the longitudinal influence range has a tendency of slightly increases; with the decrease of lining stiffness, the decrease trend of maximum principal stress is not linear and has an obvious trend of slow down, and the damping effect becomes less obvious after continuous reduction of lining stiffness; the grouting reinforcement has obvious anti-seismic effect on arch foot and haunch of the super large section tunnel in fault fracture zone, which will improve the condition of force on tunnel lining; the anti-seismic effect of full ring grouting at intervals is better than that of full ring contact grouting; it is
suggested that grouting at intervals of 1 m and 4 m in thickness should be adopted at the fault fracture zone of the super large section tunnel.
LIANG Bo1 YANG Shiheng 1 REN Zhaodan2 ZHAO Fengbing 1
.Research on Anti-seismic Technology of Super Large Section Highway Tunnel in Fault Fracture Zone[J] MODERN TUNNELLING TECHNOLOGY, 2020,V57(5): 136-142
2020, Vol. 57 