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本文应用WRM-3型多点位移计在军都山大跨度浅埋黄土隧道施工中进行拱顶垂直位移监测并成功地预报了隧道大塌方。重点分析了2号孔位移全过程的实测结果。位移与施工,地中相对位移与地面下沉等的关系也进行了初步分析和讨论。认为在此种工程条件下垂直位移监测是确保隧道稳定安全施工的重要一环。得出了上部(约1/3洞高)开挖最大垂直位移量是在隧道开挖超过观测孔1.2倍洞径内发生,并且下部落底开挖垂直位移变化不大,仅相当于上部开挖最大位移量的30—40％的结论。
In this paper, WRM-3 multi-displacement meter was used to monitor the vertical displacement of the vault during the construction of the shallow-buried loess tunnel over large span in Jundushan and successfully predicted the collapse of the tunnel. Focuses on the actual measurement results of the whole displacement process of hole No.2. The relationship between displacement and construction, relative displacement in the ground and ground subsidence were also analyzed and discussed. It is considered that vertical displacement monitoring is an important part of ensuring the stable and safe construction of tunnels under such engineering conditions. It is concluded that the maximum vertical displacement of the excavation in the upper part (approximately 1/3 of the height of the tunnel) occurs within 1.2 times of the excavation of the tunnel over the observation hole, and the vertical displacement of the lower tribe bottom excavation does not change much. It is equivalent to the upper opening only. Dig the maximum displacement of 30-40% of the conclusions.