黄维新, 吴寒, 王杰, 夏明. 2019: 偏压软弱围岩隧道开挖顺序比较研究. 工程地质学报, 27(2): 277-285. DOI: 10.13544/j.cnki.jeg.2017-503
    引用本文: 黄维新, 吴寒, 王杰, 夏明. 2019: 偏压软弱围岩隧道开挖顺序比较研究. 工程地质学报, 27(2): 277-285. DOI: 10.13544/j.cnki.jeg.2017-503
    HUANG Weixin, WU Han, WANG Jie, XIA Ming. 2019: A COMPARISON STUDY ON EXCAVATION SEQUENCE OF UNSYMMETRICAL LOADING TUNNEL IN WEAK SURROUNDING ROCK. JOURNAL OF ENGINEERING GEOLOGY, 27(2): 277-285. DOI: 10.13544/j.cnki.jeg.2017-503
    Citation: HUANG Weixin, WU Han, WANG Jie, XIA Ming. 2019: A COMPARISON STUDY ON EXCAVATION SEQUENCE OF UNSYMMETRICAL LOADING TUNNEL IN WEAK SURROUNDING ROCK. JOURNAL OF ENGINEERING GEOLOGY, 27(2): 277-285. DOI: 10.13544/j.cnki.jeg.2017-503

    偏压软弱围岩隧道开挖顺序比较研究

    A COMPARISON STUDY ON EXCAVATION SEQUENCE OF UNSYMMETRICAL LOADING TUNNEL IN WEAK SURROUNDING ROCK

    • 摘要: 针对偏压软弱围岩隧道预留核心土法不同开挖顺序造成围岩不同变形量的问题,结合洞头山工程实例,运用现场监控量测结合MIDAS数值模拟的方法,分析比较偏压软弱围岩隧道在不同开挖顺序下各阶段围岩位移变形量。研究表明:开挖顺序的改变能够有效减小隧道各部围岩变形量,且减小程度从大到小的岩体位置依次为浅埋拱腰处、浅埋拱脚处、深埋拱腰处、深埋拱脚与拱顶;拱浅埋侧最大主应力明显减小。因此对于偏压软弱围岩隧道先开挖深埋侧比先开挖浅埋侧更为安全合理。研究成果为隧道信息化施工提供依据,也为洞头山及具有类似地质地形情况的隧道施工提供借鉴与指导。

       

      Abstract: The present paper studies the deformation control of the soft surrounding rock tunnel caused by different excavation sequences of core-keeping ring cut method. The study is combined with engineering example of Dongtou Mountain tunnel. Firstly, with the tunnel model and various input parameters, the method of MIDAS numerical simulation is employed to analyze and compare the deformation of surrounding rock and maximum principal stress in different stages when the tunnel is under different excavation sequences. Finally the paper analyzes the combination of numerical simulation results and actual monitoring results. The results of the evaluation demonstrate that in the construction of Dongtou Mountain tunnel, the stability and deformation of surrounding rock are better guaranteed when the deeper side of the tunnel is first excavated rather than the shallower side. The reduction degrees of rock positions from large to small are shallow buried in the arch, shallow buried in the arch foot, deep buried in the waist, deep buried in the arch foot and vault in the descending order, respectively. The maximum principal stress decreases obviously in shallow buried side in the arch. Therefore, the better working condition is chosen and the effect of different excavation sequences on the deformation of surrounding rock of the tunnel is shown. The results provide references to the information-oriented construction of tunnel, and the guidance for design and construction of Dongtou Mountain and other tunnels in similar geological condition.

       

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