Study on the Safety Impact of the Metro Shield Tunnel Induced by Pipe Jacking Construction
A pumping station project in Wuxi constructed by pipe jacking method,crosses the shield tunnel closely.In order to en-sure the safety of the metro shield tunnel,the safety impact of the metro shield tunnel induced by pipe jacking construction is simu-lated by PLAXIS 2D and PLAXIS 3D before the construction and monitored during the whole process,and the influence of pipe jacking on tunnel deformation is predicted.Based on the analysis of simulation results and measured data,the following conclusions are demonstrated:The deformation of the tunnel meets the requirements of the construction control values;the numeri-cal analysis results is basically consistent with the measured data,the vertical deformation of metro shield tunnel caused by pipe jacking is the tunnel uplift,the horizontal deformation is relatively small,and the tunnel convergence is the lateral compression and vertical tension;during the construction of shield tunnel under the jacking pipe,the maximum deformation occurs at the top of the tunnel,so the monitoring of the top floating and the contour convergence should be strengthened.The construction of pipe jack-ing method over the subway operation tunnel can provide some reference for the safety control of similar projects.
万方数据
维普
