Effect of Shield Tunnel Construction on Surface Deformation in Changzhou

Abstract

The test section of Changzhou North Railway Station of Rail Transit Line 1 is taken as the engineering background. It is before the shield tunnel passes through the Beijing-Shanghai high-speed railway. With software of PLAXIS 3D, the numerical simulation on surface deformation is conducted considering the influence of shield tunnelling, based on the M-C. HS and HSS model. The calculated results of the three models are compared with the monitoring data. It is shown that the HSS model is optimal. In addition, the applicability of 0.5% and 0.8% for the loss rate of shield tunnelling in Changzhou is studied. It is reasonable to adopt 0.5% stratum loss rate for general shield tunnel conditions. But, sometimes in order to consider the special conditions such as deviation rectification construction, stratum loss rate should be set at 0.8%.