Research on Construction Technology ofMetro Shield Tunneling under Passing Existing Subway Lines
Taking the construction of the shield tunneling section from Muxidi Station to Daguanying Station on the newly built Beijing Metro Line 16 as an example,a risk analysis was conducted on the shield tunneling section under Metro Line 1.Based on the characteristics of the upper soft and lower hard strata,matching shield tunneling equipment was selected.Through the experimental section,excavation parameters such as soil chamber pressure,excavation speed,and cutter head speed were determined for the lower crossing section.At the same time,guarantee measures such as secondary grouting,radial grouting,and automatic monitoring were added,Ensure that the shield tunnel section smoothly passes through Metro Line 1.The maximum settlement of the track structure within the existing subway section is only 0.32mm.The smooth implementation of the crossing project effectively ensures the safety of the existing line operation,and can also provide reference for the construction of similar projects.
Shield tunnelingUnder passing constructionShield parametersSettlement control
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