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Rockfall Risk Assessment for a Tunnel Portal Section

Wang Yusuo1,2 Yang Guozhu2(1 Department of Civil Engineering,Southwest Jiaotong University,Emeishan 614202; 2 China Railway First Survey and Desigh Institute Group Co.,Ltd.,Xi'an 710043)  
Rockfalls and landslides often endanger the safety of portal sections of tunnels.Referring to the risk assessment technology of highway slope rockfall,the system of a tunnel is divided into two subsystems: portal section and body of the tunnel.The approach of primary qualitative and detailed quantitative assessments was adopted;the method of the rockfall risk assessment for the portal section was applied to Fanjiaping tunnel on Lanzhou-Chongqing railway under construction.The grey forecast for the falling stone's trajectory of the tunnel entrance front slope was carried through by using software Rockfall.Results indicated that the original design length of open-cut tunnel could not meet the needs for the prevention and treatment of rockfall.
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