This paper presents results from geotechnical centrifuge tests performed at the Japanese Institute of Occupational Safety and Health (JNIOSH) in Tokyo, Japan. A range of shallow footing configurations with different bearing pressures founded on saturated sand in a laminar box on a shake table was studied using harmonic excitations. The free-field condition was also studied as a reference. The study aimed to address the influence of stand-alone and closely adjacent shallow foundations on the dynamic response of the soil-foundation-structure system. A partially drained response of the soil and a minor dilative response for large values of shear strain were observed for the free-field case. In the case with footings, the settlement was found to be largely due to the footing penetrating the supporting sand. A dilative response of the soil beneath the footings was observed for the stand-alone configurations at the beginning of the base motions, this was not observed in the case of adjacent footings. Adjacent footings also tilt inwards consistently while stand-alone footings did not present a clear tilt pattern. In terms of the acceleration recorded in the near-surface soil beneath the footings, a reduction was observed after a few cycles in the free-field case. This reduction was considerably smaller in the case with footings with no significant differences between the response of the stand-alone and that of the closely adjacent footings.

本文介绍了在日本东京的日本职业安全与健康研究所（JNIOSH）进行的岩土离心机测试的结果。使用谐波激励研究了在振动台上层流箱中饱和砂土上建立的一系列具有不同承载压力的浅基础构造。还研究了自由场条件作为参考。该研究旨在解决独立且紧密相邻的浅层基础对地基基础结构系统动力响应的影响。在自由场情况下，观察到土壤的部分排水响应和较大的剪应变较小的扩张响应。在有立足点的情况下，发现沉降主要是由于立足点穿透了支撑砂。对于独立配置，在基本运动开始时观察到立足点下方土壤的膨胀响应，而在相邻立足点的情况下则未观察到。相邻的立脚也始终向内倾斜，而独立的立脚没有明显的倾斜模式。根据在脚下近表面土壤中记录的加速度，在自由场情况下经过几个循环后观察到了减小。在有基础的情况下，这种减少幅度要小得多，在独立基础和紧密基础的响应之间没有显着差异。相邻的立脚也始终向内倾斜，而独立的立脚没有明显的倾斜模式。根据在脚下近表面土壤中记录到的加速度，在自由场情况下经过几个循环后观察到减小。在有基础的情况下，这种减少幅度要小得多，在独立基础和紧密基础的响应之间没有显着差异。相邻的立脚也始终向内倾斜，而独立的立脚没有明显的倾斜模式。根据在脚下近表面土壤中记录到的加速度，在自由场情况下经过几个循环后观察到减小。在有基础的情况下，这种减少幅度要小得多，在独立基础和紧密基础的响应之间没有显着差异。