Abstract
Abstract The two tubes of underground railways in cities are constructed rather close together because of the station configurations. The two tunnel tubes are driven one after the other. The stresses in the linings and in the ground are affected by the driving sequences, especially in soft shaund of shallow tunnels. Hence, a consistent stres--deformation analysis for the tunnels has to take into account the mutual influence of the consecutive tube driving. The paper reports on the results of a finite element approach to these problems for shield-driven tunnels as well as for tunnels driven by excavation and shortcreting. The results are presented in diagrams that show the relative changes in stresses and deformations, in comparison with a single-tunnel analysis. These results show that single-tunnel solutions can be used to find double-tube solutions.
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