FINITE ELEMENT SIMULATION OF A TRIPLE-FACE SHIELD TUNNELLING

摘要

During shield tunnelling operation, a shield tunnelling machine is driven forward by applying mechanical jack forces behind the shield machine tail and excavating the soil in front of the shield machine with its cutting face. In this study, the advancement and excavation processes of the shield tunnelling operation are modelled using the finite element method in order to investigate the effect of these construction processes on the ground response. An excavating finite element, which models the disturbed soil in front of the cutting face, is introduced. The operation of shield advancement and of soil excavation is simulated using the finite element remeshing technique at each time step of the analysis.The proposed modelling techniques of shield tunnelling construction is applied to simulate a triple-face shield tunnelling work in Tokyo and the numerical results are compared with the field measurements.