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Deformation Monitoring and Its Control in a Shallow-buried Large-span Tunnel Constructed Using the Pile-Beam-Arch Method

QU Wan-bo1,LIU Xin-rong1,HUANG Rui-jin2,LIU Ming-zhong2(1.College of Civil Engineering,Chongqing University,Chongqing 400045,P.R.China;2.China Railway Erju Co.,Ltd.,Chengdu 610032,P.R.China)  
Deformation monitoring and control measures of a shallow-buried large-span tunnel constructed using the pile-beam-arch(PBA) method are described,taking the North Gongti Road Station of Beijing Metro line 10 as an example.Based on the monitoring datum,the crown settlement,convergence,ground settlement of the tunnel and the bridge foundation settlement are analyzed.The results show that(1) the PBA tunneling method can restrain the ground settlement and deformation of a shallow-buried large-span tunnel;(2) the depth,tunnel span and pilot tunnel construction may influence the deformation of a shallow-buried large-section tunnel significantly;and,(3) advanced conduit grouting,timely preliminary support and permanent lining construction can reduce the deformation effectively.
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