The ground surfaces induced by the subway tunnel excavation has been an issue of great concern in the engineering field. When building subway tunnels in rugged mountainous cities, settlement problems are inevitable for shallow buried sections. Therefore, this paper analyzes the influence of some major tunnelling parameters on the surface settlement during excavation by creating a fine 3D FE model for the shallow-buried section of the Chongqing Metro Circle Line. Due to the lack of construction experience in the project area, the thrust force, backfilling pressure, backfill gravels and backfilling density of the right tunnel were suggested changeless as 6500 kN, 0.3 MPa and 85% separately based on similar engineering case. Simulations show that the settlement can meet the construction control requirements (<20 mm), then the construction parameters of the left tunnel were studied in detail under the condition of right tunnel excavated. The numerical computation results reveal that a tunnelling thrust of about 5000 kN and an average backfill gravels density of 89% of left tunnel corresponded to the minimum cumulative surface settlement. Finally, both the numerical prediction and field data show that the shape of surface settlement curves in the study area still follows the Gaussian distribution, which can provide a reference for other metro construction projects in this region.

地铁隧道开挖引起的地面一直是工程领域中非常关注的问题。在崎mountain的山区城市中建造地铁隧道时，浅埋区不可避免地会出现沉降问题。因此，本文通过为重庆地铁圆环线的浅埋段创建精细的3D FE模型，分析了一些主要隧道参数对开挖过程中地表沉降的影响。由于项目区缺乏施工经验，根据类似的工程案例，建议右侧隧道的推力，回填压力，回填砾石和回填密度分别保持不变，分别为6500 kN，0.3 MPa和85％。仿真表明，沉降量可以满足施工控制要求（<20 mm），然后详细研究了在右洞开挖条件下左洞的施工参数。数值计算结果表明，约5000 kN的掘进推力和左隧洞的平均回填砾石密度为89％对应于最小的累积表面沉降。最后，数值预测和现场数据均表明，研究区地表沉降曲线的形状仍遵循高斯分布，可为该地区其他地铁建设项目提供参考。数值计算结果表明，约5000 kN的掘进推力和左隧洞的平均回填砾石密度为89％对应于最小的累积表面沉降。最后，数值预测和现场数据均表明，研究区地表沉降曲线的形状仍遵循高斯分布，可为该地区其他地铁建设项目提供参考。数值计算结果表明，约5000 kN的掘进推力和左隧洞的平均回填砾石密度为89％对应于最小的累积表面沉降。最后，数值预测和现场数据均表明，研究区地表沉降曲线的形状仍遵循高斯分布，可为该地区其他地铁建设项目提供参考。