Diaphragm walls are commonly employed as a permanent support for the building of metro stations near urban valley, and in conjunction with the interior sidewalls of the station structure to withstand the pressure from surrounding soils. Despite their prevalent use, the effect of underground diaphragm walls on the seismic response of stations is not yet fully understood. In this paper, a series of 1-g shaking table tests is designed to investigate the seismic response of a near-valley station with underground diaphragm walls within the elastic range. Modeling the stratum-structure-diaphragm walls system is accomplished by employing granular concrete reinforced with galvanized steel wires and synthetic model soils, and a station without diaphragm walls is included, serving as a benchmark for comparative analysis to understand the influence of diaphragm walls on the seismic behavior of the station. The experiment was designed for three depth-to-width ratios (DWRs), i.e. 1/3, 1/4, and 1/8, of arc-shaped valley topography, as well as the seismic excitations for the test include actual seismic records with the amplitude of 0.2 g, 0.4 g, and 0.8 g, respectively. Results show that the underground diaphragm walls enhance the lateral stiffness of the near-valley station compared to structures without diaphragm walls, and thus significantly reducing the racking deformation of structure during earthquakes. The presence of diaphragm wall would decrease the amplification of dynamic earth pressure caused by valley effect at the structural sidewalls, and significantly reduce the lateral vibration and shear effect of the station near a valley with a larger DWR. Notably, bending moment response at the connection between the diaphragm walls and structural sidewalls are dramatically amplified under strong seismic loading, and such adverse effects gradually increase with the DWR of the valley.

中文翻译：

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近谷地下车站振动台试验：地下连续墙的影响


连续墙通常用作城市山谷附近地铁站建设的永久支撑，并与车站结构的内部侧壁结合以承受周围土壤的压力。尽管地下连续墙的使用很普遍，但其对车站地震响应的影响尚未完全了解。本文设计了一系列 1 g 振动台试验来研究弹性范围内地下连续墙的近谷站的地震响应。采用镀锌钢丝增强粒状混凝土和合成模型土对地层-结构-连续墙系统进行建模，并包括一个没有连续墙的站台，作为比较分析的基准，以了解连续墙对地层连续墙的影响。台站的地震行为。实验针对弧形山谷地形的三种深宽比（DWR）（即1/3、1/4和1/8）进行设计，并且测试的地震激发包括实际地震记录振幅分别为0.2g、0.4g、0.8g。结果表明，与无地下连续墙的结构相比，地下连续墙增强了近谷站的侧向刚度，从而显着减少了地震时结构的变形。地下连续墙的存在可以减少结构侧壁谷效应引起的动土压力的放大，并显着降低靠近谷地且DWR较大的车站的横向振动和剪力效应。 值得注意的是，在强地震荷载作用下，地下连续墙与结构侧壁连接处的弯矩响应急剧放大，并且这种不利影响随着山谷的DWR而逐渐增加。