潛盾隧道通過社區下方之建物保護

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Abstract The case that a shield tunnel passes under buildings in clay layers is introduced. To avoid potential damages to the existing buildings induced by the settlement，the original planning was to apply JSG method to cut off the outward propagation of the settlement by forming a ring around the shield tunnel. The site trials of the single-，double- and triple-tube grouting had failed because of the low sampling ratio. Then HDD method in construction period was also called a halt because ground heaving has occurred. The secondary compensation grouting following backfill grouting was employed after full evaluation on construction procedure and construction-control technique，and intensive monitoring was carried during construction. This method was proved to be effective in settlement mitigation for building protection.

Key words： tunneling engineering shield tunnel building protection secondary compensation grouting

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https://rockmech.whrsm.ac.cn/EN/Y2004/V23/IS2/4870