This paper investigates the effect of seismic buffers made of flexible polyurethane (PU) foam on the seismic response of a non-yielding retaining wall. A series of shaking table tests were conducted on three types of seismic buffers: pure PU foam (9 cm thick), pure PU foam (4.5 cm thick), and a mixture of PU foam and sand (15% foam and 85% sand by mass). A control test also was carried out on a similar model without the seismic buffer. The results revealed that seismic buffers (thickness equals 15% of wall height) can reduce retaining wall forces up to 35%. Despite the low isolation efficiency, the seismic buffers of PU foam-sand mixture restricted the vertical and horizontal displacement of the backfill. It can be concluded that it is possible to construct PU foam-sand buffers at different mixing ratios behind a retaining wall that are proportional to the specified backfill displacement and load attenuation.

本文研究了由挠性聚氨酯（PU）泡沫制成的地震缓冲器对非屈服挡土墙地震响应的影响。在三种类型的地震缓冲器上进行了一系列的振动台测试：纯PU泡沫（9厘米厚），纯PU泡沫（4.5厘米厚）以及PU泡沫和沙子的混合物（15％泡沫和85％沙子）。质量）。在没有地震缓冲器的类似模型上也进行了对照测试。结果表明，地震缓冲器（厚度等于壁高的15％）可以将挡土墙的力降低多达35％。尽管隔离效率低，但PU泡沫砂混合物的地震缓冲器限制了回填的垂直和水平位移。