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  Main tunnel behaviour after widening excavation due to the drift's position

  The drift advancing method was applied under extreme weak ground condition for construction of the tunnel with large section. From the actual measurement results, the convergence and the crown settlement after widening excavation of the main tunnel are generally larger than those in the section without the drift. When the drift advancing method is adopted, it is often expected to have the effect of reducing displacement and deformation of support and ground after the main tunnel is excavated by widening the drift. In this paper, numerical analysis is used to verify the tendency of convergence and crown settlement after the widening excavation of the main tunnel, which are influenced by the position of the drift under fragile ground conditions. As a result, the effect of suppressing deformation of the ground in front of the main face was found to be maximum when the centre drift was applied.

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