Abstract
Relying on the deep foundation pit support engineering adjacent to the subway tunnel in Lanzhou, Two support schemes of double row piles and row piles + inner bracing are designed. Through the method of numerical simulation, the three-dimensional models including tunnel are established by using MIDAS-GTS-NX software, and then compared and analyzed from two aspects: the displacement of supporting structure, deformation and internal force of tunnel lining. The results show that: (1) For the double-row pile supporting structure, the maximum displacement and stress of the row pile appear near the midpoint of the side of the excavation side; for the row pile + internal bracing supporting structure, the maximum displacement and stress appear near the left position of the midpoint of the excavation side. (2) The maximum position of the tunnel displacement is different, and the displacement decreases gradually from the maximum position of the tunnel displacement to both sides of the tunnel. Through the comparative analysis, it can be known that the row pile + internal bracing structure is much better than the double-row pile supporting structure in controlling the deformation of foundation pit and adjacent tunnel.
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