Analysis of Dalian Subway Tunnel Shield Construction Impact with Engineering Materials and Engineering Mechanics on Existing Bridge Pier

In the 202 section of subway shield Dalian interval in close proximity to existing bridge as the basis, the surface settlement and bridge pier settlement observation station are established. By the 62 day of the crossing construction monitoring, the monitoring data are analyzed in detail. When surface subsidence induced by shield tunnel construction, above the measuring point start speed is faster than settling startup speed measuring points on both sides, about 2-2.5 times, subsidence range higher about 8 to 10 m ahead of time. Away from the pier side first started, and start faster than the side near the pier,is about 1.2 times, settlement of shield construction are mainly concentrated in the distance before and after the excavation of shield machine 10 m, accounting for 80.72%-81.6% of the total settlement. At highest risk for shield construction area, we should strengthen monitoring and make contingency plans in a timely manner.