The Research and Control Measures of the Influence on the Complicated tie-line and the Bridge under the Shield Tunnel

Abstract

The analysis and calculation of the influence of Shield Tunnels Crossing Existing Railways and bridges considering the time-space effect is of great significance to the risk control of shield tunnels. Taking the long-distance bus station-production Road station section of Jinan rail transit line R2 as an example, shield tunnelling method is used to construct the shield tunnels in this section, and the shield tunnels are crossed under the Beibei Bridge of Beijing-Jiaozuo Liaison Line and Beijing-Shanghai Link In order to study the influence of shield tunnelling on railway and bridge piles, three-dimensional finite element numerical analysis method is used to establish a three-dimensional finite element analysis model through MIDAS/GTS. The position relationship of shield tunnels, railways and bridge piles and the shield tunnelling distance are simulated. The stress of railway subgrade and pile foundation caused by shield tunnelling is analyzed. The result of deformation is within the allowable value of deformation control of railway and bridge. Without any reinforcement measures, through monitoring the deformation of subgrade and bridge, timely feedback of monitoring information and timely adjustment of shield tunnelling parameters, shield tunnelling can safely Cross railway and bridge. The development of similar projects will provide relevant reference.