地铁隧道施工过程的数值模拟与工法比选

Numerical Simulation and Construction Method Comparison of Subway Tunnel Construction Mechanics

结合广州地铁六号线工程,应用三维有限差分岩土计算软件模拟了浅埋暗挖地铁隧道不同施工方案的施工过程,分析了施工所引起的地表沉降、洞周变形、支护结构受力和掌子面突起等,通过对不同施工方案的施工效应进行预测与方案的比选,以达到有效发挥掘进机的特点,提高施工效率,确保隧道围岩的稳定性,有效控制由于开挖引起的地表和洞周变形的目的,为工程实际施工提供参考。

In combination with Guangzhou subway 6th line project, by means of finite - differ- ence/finite - volume software FLAC3D, we stimulated the construction process of different con- struction projects of shallow excavated subway tunnel and analyzed the surface subsidence, the deformation of tunnel surroundings, the dome shape supporting structure by force, and the face displacement, etc. Predict and select the optimal project through the comparison of the effects of different construction projects in order to bring into play the characteristics of grab and im- prove the construction efficiency as a result, meanwhile, to ensure the stability of the tunnel wall, and control the deformation of surface and surroundings caused by the excavation effec- tively. This paper provides references for the actual construction works.