This paper presents an experimental study on reduced scale geosynthetic reinforced soil (GRS) abutment models subjected to cyclic traffic loading, aimed at investigating the influences of cyclic load amplitude, self-weight of bridge superstructure, and reinforcement vertical spacing on the cumulative deformations. The GRS abutment models were constructed using sand backfill and geogrid reinforcement. A static load was first applied to account for the self-weight of bridge superstructure, and then the cyclic loads were applied in several phases with increasing amplitude. The results indicate that significant cumulative footing settlement under cyclic loading mainly occurs within the first few hundred loading cycles, and the settlement increases with increasing cyclic load amplitude. The cyclic load amplitude and reinforcement vertical spacing have significant impacts on the cumulative deformations of GRS abutments under cyclic loading. The maximum facing displacement under cyclic loading occurs near the top of the wall. The cyclic load has a greater impact on the reinforcement strains near the upper middle reinforcement layers, while it has a smaller impact on the lower reinforcement layers.

中文翻译：

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循环交通荷载下GRS桥台累积变形行为

本文提出了循环交通荷载作用下缩尺土工合成材料加筋土（GRS）桥台模型的试验研究，旨在研究循环荷载幅值、桥梁上部结构自重和钢筋竖向间距对累积变形的影响。 GRS 桥台模型是使用回填沙和土工格栅加固构建的。首先施加静载荷来考虑桥梁上部结构的自重，然后分几个阶段施加循环载荷，并逐渐增加幅度。结果表明，循环荷载作用下显着的累积基础沉降主要发生在前几百个荷载循环内，且随着循环荷载幅值的增大，沉降量逐渐增大。循环荷载幅值和钢筋竖向间距对循环荷载下GRS桥台的累积变形有显着影响。循环荷载作用下的最大面位移发生在墙顶附近。循环荷载对中上部加强层附近的钢筋应变影响较大，而对下部加强层影响较小。