Laboratory model tests and numerical simulations were conducted to investigate the control effect of different arrangements of isolation piles on the additional deformation and stress of tunnels adjacent to pit excavation. Four different arrangements of isolation piles were discussed in this work: arched, curved, double-row, and single-row. The results indicated that considering the burial depth, the four arrangements of isolation piles had significant control effects on the horizontal and vertical deformation, as well as the bending moment of the tunnel. Among them, arch-shaped isolation piles have better isolation effects than other types discussed in this work. Subsequently, taking the arch-shaped isolation piles as an example, the effects of the burial depth, pile position, height-span ratio, and the optimal buried depth of the arch-shaped isolation piles on the tunnel were investigated. The arch-shaped isolation piles have a critical height-span ratio of 0.123, and the closer to the tunnel, the better the protective effect on the tunnel. The optimized embedding depth of isolation piles depends on the depth of the tunnel and the relative position to the foundation pit. The results of this study have great guiding significance for the design of isolation piles to protect adjacent tunnels near excavations.

中文翻译：

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隔振桩在基坑附近保护地铁隧道的性能：实验和数值研究


通过室内模型试验和数值模拟，研究了不同布置的隔振桩对基坑开挖附近隧道附加变形和应力的控制效果。这项工作讨论了四种不同的隔振桩排列方式：拱形、弯曲、双排和单排。结果表明：考虑到埋深，4种隔震桩布置对隧道的水平和竖向变形以及弯矩具有显著的控制作用。其中，拱形隔振桩比本文讨论的其他类型的隔振效果更好。随后，以拱形隔震桩为例，研究了拱形隔振桩的埋深、桩位、高跨比以及最佳埋深对隧道的影响。拱形隔振桩的临界高跨比为 0.123，越靠近隧道，对隧道的保护效果越好。隔振桩的优化埋设深度取决于隧道的深度和与基坑的相对位置。本研究结果对隔离桩设计保护基坑附近相邻隧道具有重要的指导意义。