The surrounding rock may become unstable or even fall down and the initial support may crack and be destroyed when the construction method of the underground excavation tunnel is not properly selected in the turn line of metro. . A section of the Santunbei turn line of Urumqi Metro Line 1# was taken as the engineering background. The proposed construction method was analyzed by numerical simulation. Numerical analysis shows that the final surface settlement caused by the proposed construction method is 3.0 mm and the horizontal convergence is 3.2 mm. It also turns out that the proposed construction method causes less deformation, and the method can be applied to the construction of the small interval tunnel in the Santunbei turn line of metro. The rationality of the method and numerical model was further verified by comparison between the monitored data of surface settlement, horizontal convergence and vault sinking, and numerical simulation results. Finally, the deformation and stress of the six construction methods were compared. The deformation and stress caused by the six construction methods are almost the same. It indicates that the construction spacing between the left and right tunnels does not affect the safety of tunnel construction. Therefore, the appropriate construction spacing could be selected according to the resource configuration, instead of deformation and stress.

地铁转弯线地下开挖隧道施工方法选择不当，可能会导致围岩失稳甚至倒塌，初始支护可能开裂破坏。。以乌鲁木齐地铁1号线三屯北转弯线一段为工程背景。通过数值模拟对所提出的施工方法进行了分析。数值分析表明，该施工方法引起的最终地表沉降为3.0 mm，水平收敛量为3.2 mm。结果表明，该工法变形较小，可应用于地铁三屯背转线小区间隧道的施工。通过地表沉降、水平收敛和拱顶下沉监测数据与数值模拟结果的对比，进一步验证了方法和数值模型的合理性。最后对6种施工方法的变形和应力进行了比较。六种施工方法引起的变形和应力几乎相同。表明左右隧道施工间距不影响隧道施工安全。因此，可以根据资源配置来选择合适的施工间距，而不是根据变形和应力来选择。