Abstract:

  Based on different tunnel excavation sequences, the authors make numerical simulation on shallow tunnels under unsymmetrical pressure that are excavated by core soil keeping method and obtain the rules of deformation and stress distribution of rock mass and support structure under different excavation sequences. On basis of these rules, the authors evaluate the effect of the unsymmetrical pressure on the rock mass of the tunnel, recommend reasonable excavation sequence and point out the positions that need special monitoring and attention. The conclusion of this research can provide theoretical basis for construction design of similar tunnels in the future.