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  Protection of Adjacent Buildings Due to Mixshield Tunnelling in Mixed Ground with Round Gravel and Mudstone

  The micro-disturbed construction in mix ground is a major challenge in the shield tunnelling construction. The Nanning metro line 1 crossing a mass of buildings is confronted with the challenge of round gravel and mudstone. The settlement control scheme consisting of the selection of TBM, tunnelling parameters optimization was put forward before crossing the buildings. Then the mix proportion design of sleeve valve pipe grouting and synchronous grouting was presented. The variation of the tunnelling parameters was analyzed with the different mixed ratio. The field measured results show that sleeve-valve-pipe grouting is quiet useful to reduce settlement. The slurry pressure, torque and total thrust may enlarge significantly while the penetration rate shall decrease in mixed ground of round gravel and mudstone. There are largest fluctuations of parameters when .To control the slurry pressure is the first priority to protect buildings.

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