Risk Control Method and Practice in the Whole Construction Process of a Shield Tunneling Pipe Gallery in Complex Surrounding Underground Environment

This paper establishes a risk control method that ensures the construction safety of a comprehensive underground pipe gallery in a complex surrounding environment. Through risk identification, risk analysis, and the application of numerical simulation, the construction safety of an underground pipe gallery crossing in close range of an existing bridge was evaluated and monitored. Construction risk control measures are formulated based on the geological conditions, engineering experiences, numerical simulation, and risk assessment. By using an information monitoring system during the whole construction process, the construction parameters are adjusted and optimized. The implementation shows a good control effect. The numerical analysis indicates the key risk control indicators that are verified from the monitoring results at the construction site. Both the displacement of the ground and the structure all meet the control requirements. The good implementation effect suggests that the construction risk can be controlled and that the suggested risk control method is reasonable and applicable. This research and case study results provide design, construction, and risk management experience for subsequent similar projects.