Abstract
In this study, both centrifuge tests and a finite difference program (FLAC) were taken to investigate the tunnel stability and soil movements for both the unlined single tunnel and parallel tunnels. For the stability analysis, the observed overload factors at collapse are well bounded by the theoretical upper and lower bound solutions. From test results, the relationship of ground loss versus the maximum settlement is proposed. Using empirical methods, the settlement trough due to single tunnelling was fit by a normal probability curve. By superimposing two curves with a factor of 0.85 times the width parameter fit from the single tunnel, the settlement trough induced by parallel tunnelling could be estimated. In addition, the surface settlement troughs computed from FLAC show reasonable agreement with test results before tunnel collapsed. The computed plastic zone shows the extent of yield zone and the interaction of twin tunnels.
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