Tunnel excavation in urban areas causes ground movements that could damage existing nearby piled structures. In practice, to protect structures from tunnelling-induced damage, a stiff protective wall can be constructed between the tunnel and the adjacent piled structure. In this paper, results from four hybrid geotechnical centrifuge tests (where data are coupled between the centrifuge and numerical models) are used to quantify the effect of protective walls on reducing the impact of tunnelling on an adjacent framed building with four piles. Two protective walls with different embedded depths are considered: a ‘shallow’ wall with its toe at the tunnel axis depth and a ‘deep’ wall with its toe below the tunnel invert. Compared to the ‘no-wall’ case, the ‘deep’ protective wall is shown to significantly reduce uneven pile settlements, structural distortions, and load transfer (through the building) between piles; the ‘shallow’ wall is shown to have little benefit. Data from the instrumented walls and piles are used to explain the dominant mechanisms at play and investigate how the load is redistributed within the piles.

城市地区的隧道开挖导致地面运动，可能会损坏附近现有的桩结构。在实践中，为了保护结构免受隧道引起的损坏，可以在隧道和相邻的桩结构之间建造坚硬的保护墙。在本文中，四次混合岩土离心机测试（其中数据在离心机和数值模型之间耦合）的结果用于量化保护墙对减少隧道对具有四根桩的相邻框架建筑的影响的影响。考虑了两个具有不同嵌入深度的保护墙：一个“浅”墙，其趾部位于隧道轴线深度，而“深”墙其趾部低于隧道内底。与“无墙”情况相比，“深”保护墙显着减少了不均匀的桩沉降，结构变形和桩之间的荷载传递（通过建筑物）；事实证明，“浅”墙几乎没有什么好处。来自仪表墙和桩的数据用于解释起作用的主要机制，并研究载荷如何在桩内重新分配。