【摘要】 为探讨型钢支撑在重叠盾构隧道施工过程中对既有隧道的加固效果，以北京地铁清河小营桥站至清河站区间的重叠盾构隧道工程为研究背景，采用监测数据分析与数值模拟相结合的方法，研究了新建隧道施工对既有隧道的影响，并分析了型钢支撑对既有隧道的变形控制能力及其本身的受力状态。研究结果表明：新建隧道上穿施工会引发既有隧道的上浮变形，而型钢支撑在显著减小既有隧道的隆起和收敛变形方面发挥了重要作用，其中隆起变形的控制效果达到23.60%,收敛变形的控制效果超过80.00%。型钢支撑的受力主要集中在竖撑、长横撑和环撑部位，而短横撑和纵撑的受力相对较小。适用研究结果表明，在新建隧道净距较小且上穿既有隧道的施工条件下，型钢支撑的使用效果最佳，为未来型钢支撑的应用提供依据。更多还原

【Abstract】 To explore the reinforcing effect of steel supports on existing tunnels during the construction of overlapping shield tunnels, the study uses the overlapping shield tunnel project from Qinghe Xiaoyingqiao Station to Qinghe Station in the Beijing Metro as a research background. By combining monitoring data analysis and numerical simulation methods, the study investigates the impact of new tunnel construction on existing tunnels and analyzes the deformation control ability of steel supports on existing tunnels, as well as their own stress state. The results show that the construction of the new tunnel above the existing tunnel induces upward deformation in the existing tunnel. However, the steel supports play a significant role in reducing the uplift and convergence deformation of the existing tunnel. Specifically, the control effect on uplift deformation is 23.60% and the control effect on convergence deformation exceeds 80.00%. The stress on the steel supports is primarily concentrated at the vertical braces, long horizontal braces and ring braces, while the stress on the short horizontal braces and longitudinal braces is relatively small. The applicability study indicates that steel supports perform best under construction conditions where the new tunnel has a small clearance and passes over the existing tunnel, providing a solid basis for future applications of steel supports.更多还原