大断面黄土隧道施工及工后沉降数值分析

Numerical Analysis on Settlement during Construction and after Construction in Large Section Loess Tunnels

通过有限元数值计算分析,以黄土区铁路隧道开挖工程为实例,研究探讨了大断面浅埋黄土隧道采用CD法施工期间的衬砌变形与地面沉降,并考虑了衬砌施作时间对施工期间及工后沉降的影响。对于工后沉降分析采用拟静力方法预测隧道在车辆动荷载作用下的沉降变形,所得结论可为黄土区浅埋地下隧道的设计与施工提供参考依据。

By FEM numerical calculation and analysis, taking the railway tunnel excavation projects in loess areas [＇or example, the lining deformation and ground settlement of a large section shallow buried loess tunnel during the construction adopting CI） method are researched and discussed;moreover the influences of lining construction time on the settlement during construction period and after construction are considered. Imitativestatic methed is adoptcd for the settlement analysis after construction to predict the settlement deformation of tunnels by the action of dynamic loadings of vehicles. The conclusions obtained will provide a reference for the design and construction of shallow buried underground tunnels in loess areas.