Railway construction has been developed rapidly. But during the construction of a new subway, the tunnel will inevitably pass through the foundation of buildings. How to control the risk of underpinning construction and protect existing buildings becomes an inevitable challenge. The paper focuses on the management and technology used in Viaduct Pile foundation underpinning, elaborates the design, construction technology and safety monitoring work. The provided valuable experience of bridge pile foundation underpinning construction in complex environments and geological conditions is helpful to security risk management.

This paper introduces the engineering example of the first issue of Wuhan no.4 metro line of Wuchang railway station ~ Meiyuan district station which shield tunnel crossed the Wuchang railway station.By arranging observation points in the earths surface and sleeper on the settlement in the lines, the construction process can be monitored.The subway shield tunnel construction influence on surface deformation lines can be discussed, and the corresponding protective measures can be put forward which are caused by the shield tunnel crossing railway station and possible risk factors.In this paper, the project tracked and monitored on surface subsidence line and sleeper.With the monitoring data analysis and timely adjustment of shield tunneling construction parameters, to maintain the stability of the excavation face shield and prolapsed shield tail pipe, and take measures of synchronous grouting, secondary grouting to fill voids shield tail construction and other measures in time to ensure the safety of the projects and railway traffic.Monitoring results showed that shield tunnel construction scheme is reasonable and reliable.By the analysis of the monitoring data, some of the recommendations of the similar construction can be offered.