doi:

DOI: 10.3724/SP.J.1249.2018.04389

Journal of Shenzhen University Science and Engineering (深圳大学学报理工版) 2018/35:4 PP.389-397

Analysis of track deformation and subgrade settlement of shield tunnel construction crossing existing railway


Abstract:
To study the changes of track deformation and subgrade settlement of the shield tunnels across the existing railway, and to analyze the reinforcement effect of deep hole grouting in subgrade, we carry out the dynamic simulation by using the finite element software Midas-NX based on the shield construction of Tianjin Metro Line 7. We analyze the horizontal and vertical deformations of the rail and the distribution of the vertical displacement of the railway subgrade after the completion of the shield construction. The results show that the transverse deformation of the rail undergoes two processes of enlargement first and then decreases with the construction progress, and forms a symmetrical distribution along the rail body; the rail deformation reaches the extreme value when the shield reaches the bottom of the railway for two times, and the center of the settlement trough along the rail gradually moves to the engineering center with the construction step. After reinforced by deep hole grouting, the lateral and vertical displacements of the rail and the settlement of the roadbed reduce by 85.1%, 76.7% and 74.1%, respectively, which is beneficial to ensure the safety of the railway in the subway shield process.

Key words:tunnel engineering,shield tunnel,railway subgrade,deep hole grouting,rail deformation,subgrade settlement,finite element

ReleaseDate:2018-07-26 10:51:03



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