In common engineering practice, foundation–soil–foundation interaction of shallow foundations is frequently ignored. This is presumably for cost/benefit reasons, since computationally demanding finite-element and/or boundary element models are required for that purpose, and its effects are usually assumed to be negligible. In this sense, the present paper provides a simple and inexpensive way of incorporating foundation–soil–foundation interaction through a numerically explicit stiffness matrix formulation. The necessary ingredients for homogeneous and non-homogeneous (shear modulus power-law variation with depth) half-spaces are given. The proposed approach is then applied to offshore wind turbines’ multiple suction caisson foundations (tripod and tetrapod), where it is observed that the foundation–soil–foundation interaction is significant. Its range of validity is also established, and valuable ready-to-use closed-form formulas for the correction factors of the stiffnesses of tripod and tetrapod groups are also derived. The methodology is applicable as long as the spacing between foundations is somewhat greater than the foundation depth.

中文翻译：

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将地基-土-地基相互作用纳入多单元浅地基静刚度的简单方法

在一般的工程实践中，浅层地基的地基-土-地基相互作用经常被忽略。这大概是出于成本/收益的原因，因为为此目的需要计算要求高的有限元和/或边界元模型，并且通常假设其影响可以忽略不计。从这个意义上说，本论文提供了一种通过数值显式刚度矩阵公式结合基础-土壤-基础相互作用的简单且廉价的方法。给出了均匀和非均匀（剪切模量幂律随深度变化）半空间的必要成分。然后将所提出的方法应用于海上风力涡轮机的多吸沉箱基础（三脚架和四脚架），观察到地基-土壤-地基相互作用是显着的。还建立了其有效性范围，并推导出了用于三脚架和四脚架群刚度校正系数的有价值的即用型封闭式公式。只要基础之间的间距稍大于基础深度，该方法就适用。