隧道施工中盾构机吊装对基坑支护结构稳定的影响

盾构机吊装是盾构法隧道施工中的重要步骤,由于盾构机本身体型大、荷载重、起吊时间短的特点,盾构机吊装成为隧道盾构施工过程中的一个危险因素。在盾构机吊装过程中,对连续墙的位移、支撑杆的轴向力和变形进行了实时监测,针对盾构起吊过程短暂、监测实施困难的特点,采用有限元分析法,将现场实测数据与有限元计算结果进行对比分析。研究结果表明:盾构机的吊装过程中,隧道开挖支护结构是安全稳定的,有限元分析方法也是有效的。此研究成果可为相似工况其他隧道工程中的盾构机吊装安全稳定分析提供参考。

Influence of Shield Lifting on Supporting Structure of Pit During Tunnel Construction

Shield lifting is an important procedure in tunnel construction by shield method.Due to the large size of shield,heavy load and short lifting time,lifting process becomes a big risk in shield tunnel construction.During the lifting process,the displacement of continuous wall,the axial forces and deformation of supports were monitored in real time.Finite element method(FEM) was applied because the lifting process is very short and some monitoring programs are difficult to be conducted.Results showed that the data from FEM proved to be effective in comparison with measured data and the excavation is safe during the shield uplifting.The research results provide references for similar projects.