Study on Mechanical Model for Longitudinal Deformation of Existing Shield Tunnel Caused by New Tunnel Over-crossing Construction
Based on the pressure arch theory,the construction of a new tunnel crossing over an existing shield tunnel is divided into three modes according to the relative position of the new tunnel and the pressure arch.Corresponding mechanical calculation models are established,and the applicable deformation control equations and solution methods for the models are provided.The models are then validated using measured data from the new Caoqiao Station of the Beijing Daxing Airport Line,which crosses over the existing shield tunnel of Line 10.The results show that the pro-posed models have high accuracy,with the calculated maximum vertical displacement of the shield tunnel being closer to the measured values compared to traditional models,thereby improving the accuracy of longitudinal defor-mation prediction for shield tunnels.
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