The number of constructed tunnels has been gradually increasing for the past decades due to rapid development in urban areas.\nHowever, the soil-structure interaction problems arising from perpendicularly crossing tunnels attract relatively little research\nattention in the past. In this study, six three-dimensional finite element analyses were conducted to simulate tunnel excavation\nnearby a perpendicularly crossing existing tunnel, in an attempt to investigate the effects of construction sequences on crosscutting\ntunnels. The hypoplastic constitutive model for sand is adopted in the numerical analysis to consider the soil small-strain\nstiffness. Computed results are presented and discussed in terms of ground surface settlement, displacement and deformation of\nthe existing tunnel, and bending moment induced on the existing tunnel.The stress-transfer mechanism in soil nearby the existing\ntunnel due to tunnelling is also studied.
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