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Analysis on the jacking load of the curved pipe roof supporting the large diameter Gongbei tunnel |
SHI Peixin1,YU Caicheng1,PAN Jianli2,LIU Wei1 |
(1. School of Urban Rail Transportation,Soochow University,Suzhou,Jiangsu 215002,China;2. China Railway Eighteen
Bureau Group Co.,Ltd.,Tianjin 300222,China)
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Abstract The load jacking the curved pipe roof supporting the large diameter Gongbei tunnel is analyzed. The major components and the impact factors of the jacking force along a curved alignment are discussed. The calculated jacking load based on the design codes of China and Japan is compared with the field measurement and the difference is investigated. The equation for estimating the front face resistance during slurry pipe jacking is recommended. The side frictional resistance and friction coefficient are suggested based on the field measurement to the pipe roof of the tunnel in Gongbei. A formulation for predicting the total jacking force for segmented curved pipe is developed based on the force equilibrium analysis. The analysis shows that the value of unit side resistance and the interface frictional coefficient of steel pipes with lubrication are significantly smaller than that of concrete pipes. The estimated jacking load using the equation derived in this study matches the field measurement well.
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