In this paper, the influence of the foundation configuration (raft or separate footings) on tunnel–soil–framed building interaction is investigated using geotechnical centrifuge testing. Tunnelling-induced soil movements and deformation fields, framed building displacements and structure shear distortions (with associated modification factors) are illustrated. Framed building stiffness and footing bearing capacity are also evaluated experimentally. Results show that the foundation configuration plays an important role in determining the ground response to tunnelling, affecting soil displacement fields, as well as the distribution of soil shear and volumetric strains. In particular, foundation settlements and differential horizontal displacements are larger for separate footings compared to raft foundations. The effects of building width, weight and eccentricity (with respect to the tunnel) on foundation settlements and structural distortions are quantified for separate footings and contrasted against results for raft foundations. The modification factor of the maximum building shear distortion is linked to the relative soil–building shear stiffness; interestingly, for buildings with similar values of relative stiffness, the level of shear distortion within framed buildings is lower for separate footings than rafts.

中文翻译：

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隧道-框架建筑相互作用：筏板和独立基础之间的比较

在本文中，使用岩土离心机测试研究了基础配置（筏板或单独的基脚）对隧道-土-框架建筑相互作用的影响。说明了隧道引起的土壤运动和变形场、框架式建筑位移和结构剪切变形（以及相关的修改因素）。框架建筑刚度和基础承载能力也通过实验评估。结果表明，地基配置在确定隧道开挖的地面响应、影响土壤位移场以及土壤剪切和体积应变的分布方面起着重要作用。特别是，与筏式基础相比，独立基础的基础沉降和水平位移差更大。建筑宽度的影响，地基沉降和结构变形的重量和偏心（相对于隧道）针对单独的基础进行量化，并与筏式基础的结果进行对比。最大建筑剪切变形的修正系数与相对的土体剪切刚度有关；有趣的是，对于具有相似相对刚度值的建筑物，独立基础的框架建筑物内的剪切变形水平低于筏板。