月亮山隧道围岩变形规律及稳定性

发布时间：2019-03-30 20:26

【摘要】：隧道开挖时,控制围岩变形是工程安全的重要保障。以湖北省月亮山隧道为例,选择三个典型隧道断面数据进行围岩变形研究,得到了围岩变形-时间关系曲线。通过利用最小二乘法和nlinfit函数法对量测数据的处理,得出两种回归分析方法下拟合程度的比较分析研究,从而发现一种更简便的计算方法和更适合该隧道的回归方程,预测了收敛趋于稳定的时间和总变形量,确定预留变形量,为二次衬砌提供合理的支护时机。同时运用FLAC3D三维有限元软件进行了数值模拟,分析了该隧道施工的空间效应,得到了围岩变形稳定距离。最后对隧道围岩稳定性进行了评价,给出相应的处理建议,对隧道的设计修改和施工具有重要的指导意义。
[Abstract]:During tunnel excavation, controlling the deformation of surrounding rock is an important guarantee for engineering safety. Taking Yueliangshan tunnel in Hubei province as an example, three typical tunnel cross-section data are selected to study the deformation of surrounding rock, and the curve of deformation-time relation of surrounding rock is obtained. By using the least square method and the nlinfit function method to deal with the measured data, the comparative analysis of the fitting degree under the two regression analysis methods is obtained, and a simpler calculation method and a more suitable regression equation for the tunnel are found. The time when convergence tends to be stable and the total deformation amount are predicted, and the reserved deformation amount is determined, which provides a reasonable supporting opportunity for the secondary lining. At the same time, the space effect of tunnel construction is analyzed by using FLAC3D three-dimensional finite element software, and the stability distance of surrounding rock deformation is obtained. Finally, the stability of surrounding rock of tunnel is evaluated, and the corresponding treatment suggestions are given, which has important guiding significance for the design, modification and construction of tunnel.
【作者单位】：中国矿业大学(北京)力学与建筑工程学院;
【基金】：国家自然科学基金(U1361210) 中央高校基本科研业务费专项资金(2009QL11)资助
【分类号】：U451.2

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