地铁隧道开挖引起地表沉降的数值模拟研究

大中型城市修建地铁是未来城市建设的一个重要方向,但是城市中环境复杂,地表沉降控制要求严格。因此,研究隧道开挖地表沉降变化规律,对沉降控制具有重要的实践意义。文章运用有限元数值模拟方法对青岛某标段地铁隧道工程进行分析,结合数值计算结果与现场实测数据,研究隧道在由断面开挖对地面沉降变化规律的影响,对比实际隧道开挖的监控数据,模拟结果表明,地表沉降仍在安全范围内,可以为类似工程沉降控制提供参考。

Numerical Simulation Study of the Impact of Excavation of Metro Tunnels on Land Subsidence

The construction of subways is important in the development of large and medium-sized cities, but the urban environment is complicated, and the control of the surface subsidence needs to be strict. Therefore, it is of great practical signiifcance to study the change regulation of tunnel excavation. In this paper, a metro tunnel engineering in Qingdao is analyzed by the numerical simulation method. The ground subsidence change regulation in the construction of the tunnel with conversion section is studied with the results of numerical calculation and the ifeld measure data. The monitoring data and the simulation data are compared. The results show that the ground subsidence is controlled in safe scale, and it can provide reference for the study of ground surface subsidence in similar projects.