Study on the Deformation Influence of TBM Tunnel Undercrossing High-speed Rail Tunnel
In the process of tunnel boring machine tunneling through the existing high-speed rail tunnel,the complex influence of the dynamic load of the high-speed rail train and the construction of the new tunnel on the deformation law of the existing tunnel was studied.Taking the Oujiang Diversion TBM Tunnel passing under the existing Yuanyanzhai High-speed Railway Tunnel project as the background,the ABAQUS finite element software was used to establish a three-dimensional numerical simulation model.The influence of the construction of the new tunnel on the deformation distribution law of the existing high-speed railway tunnel under the action of train load was compared and analyzed,and the analysis and comparison were carried out in combination with the field monitoring data.The results show that the final settlement of the bottom of the existing tunnel is'groove-shaped'along the axis of the tunnel.Due to the different buried depths of the tunnel extension direction,the settlement distribution groove is obviously asymmetric to the central section of the tunnel and offsets to the entrance section of the tunnel with greater buried depth.Under the action of train load,the settlement of the existing tunnel increases obviously,and is improved by 64%approximately compared with that of without train loads.With the increase of the number of train loads,the influence on the settlement of the existing tunnel decreases gradually.Under the combined action of train load and new tunnel excavation,as the TBM approaches the central axis of the existing tunnel,the existing tunnel settles first.When the TBM passes through the crossing center,the existing tunnel rebounds,and then gradually settles to a stable value with the TBM tunneling.
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