论文部分内容阅读
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。
In this paper, the types of existing subway tunnels beneath the newly built tunnels are divided and the deformation characteristics of the existing tunnels are summarized. Furthermore, based on the elastic foundation beam model, based on the elastic foundation beam model, the calculation of the existing tunnel by the new tunnel vertical down under the assumption that the construction of the tunnel under the tunnel caused by the construction of the settlement groove Gaussian curve coincides with the deformation trend of the existing tunnel and the surrounding strata, The longitudinal settlement curve expression, the longitudinal stress calculation formula and the ultimate settlement expression that can be borne by the existing tunnel are all affected by the construction. Formed a quantitative evaluation of the construction of new vertical tunnel construction on the existing subway tunnel longitudinal deformation and internal forces of the theoretical calculation methods and ideas. Through the comparison with the monitoring results of specific engineering cases, the calculated results obtained by the above method are in good agreement with the measured values, which can meet the engineering requirements and provide reference for the design and construction of similar projects in the future.