正交下穿施工对上部既有隧道安全的影响研究

发布时间：2018-05-24 15:02

本文选题：隧道 + 下穿施工　；参考：《地下空间与工程学报》2014年02期

【摘要】：本文首先对新建隧道下穿上部既有地铁隧道的类型进行了划分,对此类工程既有隧道的变形特征进行了总结。进而,在假定隧道正交下穿施工引起的地层沉降槽符合高斯曲线、既有隧道与周边地层的变形趋势一致的基础上,基于弹性地基梁模型,推导了计算既有隧道受新建隧道垂直下穿施工影响而产生的纵向沉降曲线表达式、纵向应力计算公式以及既有隧道所能承受的极限沉降表达式。形成了定量评价新建隧道垂直下穿施工对上部既有地铁隧道纵向变形和内力影响的理论计算方法和思路。通过与具体工程实例监测结果的对比分析,上述方法所得计算结果与实测值吻合较好,可以满足工程使用要求,对今后类似工程的设计和施工很有借鉴意义。
[Abstract]:In this paper, the types of new tunnel under the upper part of the existing subway tunnel are divided, and the deformation characteristics of the existing tunnel are summarized. Furthermore, based on the assumption that the settlement trough caused by the orthogonal underpass construction of the tunnel accords with the Gao Si curve and the deformation trend of the tunnel and the surrounding strata is the same, the elastic foundation beam model is used. The expressions of the longitudinal settlement curve caused by the vertical underpass construction of the existing tunnel, the formula for calculating the longitudinal stress and the expression for the ultimate settlement of the existing tunnel are derived. A theoretical calculation method and train of thought for quantitatively evaluating the influence of vertical underpass construction on the longitudinal deformation and internal force of the existing subway tunnel in the upper part of the tunnel are established. Through the comparison and analysis with the monitoring results of concrete engineering examples, the calculated results obtained by the above methods are in good agreement with the measured values, which can meet the requirements of engineering use and have a reference significance for the design and construction of similar projects in the future.
【作者单位】：北京交通大学;北京城建设计研究总院有限责任公司;
【分类号】：U451

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