Study on the deformation prediction model of shield metro tunnel construction under existing cross tunnels and platforms
The impact of shield construction while constructing metros on existing structures has always been a key consideration for engineering safety and efficiency.This article employs the finite element numerical simulation method to study the deformation impact of shield construction of tunnel A of the Guangzhou metro on adjacent tunnels B and C,and platform D.The study aims to reveal the deformation patterns when new tunnels are constructed beneath existing structures and to predict the extent of their impact.The results show that the maximum deformation is located at the nearest point of the construction axis,and decreases with the increase in distance from the construction location,and the deformation mainly occurs during the parallel passage of the construction.The surface settlement is symmetrically distributed,and the maximum value is located in the middle of the tunnel.The von-Mises stress at the connection of existing tunnels is less affected by the excavation of new tunnels,and the peak stress moves with the advancement of shield construction,but the variation is limited.The field monitoring data is highly consistent with the numerical simulation results,which could verify the validity and reliability of the simulation method.The relevant research of this article could provide an important reference for the construction of metro projects,which could help optimize the construction plan and improve the safety and efficiency of the project.
metrocross tunnelsshield constructiondeformation impactfinite element numerical simulation
万方数据
维普
