Influence of metro airway tunneling on existing pile foundation near subway station

This paper, making Beijing Guo Mao metro station airway construction of shallow tunnel by excavation in complex building environment as engineering background, studies regulations of influence of airway tunneling on existing bridge deformation. Construction deformation feasible monitoring plan is put forward, and its purpose is to provide support for Beijing similar metro station airway tunneling security. The results show that headings tunneling, airway reinforcing and arch, north airway tunnel excavating and supporting are three main construction phases in station airway tunneling process. The deformation influence in phase of airway reinforcing and arch is more serious than that of the other two phases. Thus, it is necessary to take reinforcing measures and deal with point transformation in this phase. In the process of airway tunneling construction with Drift-Pile-Arch (Drift-PBA), it should take informationized construction technique and strengthen monitoring of deformation of bridge pile foundation and ground surrounding underground airway to ensure safe airway tunneling.