Many examples of earthquake damage show that liquefied lateral spreading is the main cause of pile foundation failure. Rigid-drainage piles installed two drainage grooves with plastic drainage plates are a new type of liquefaction-resistant pile that can take into account the bearing capacity and drainage function. In this paper, a series of 1-g shaking table tests were carried out to analyse the seismic response of a rigid-drainage pile-superstructure-quay (RSQ) wall system subjected to lateral spreading. Three levels of earthquake intensities, including small earthquakes (peak ground acceleration, PGA=0.05 g), moderate earthquakes (PGA=0.1 g), and large earthquakes (PGA=0.2 g), were investigated. The improvement in the anti-liquefaction performance of the rigid-drainage piles was comparatively analysed. Moreover, the influences of far-field and near-field ground motions were also discussed. The experimental results showed that rigid-drainage piles could effectively reduce the liquefaction degree and the horizontal flow of the sand stratum. In addition, the internal force and displacement of the superstructure built on drainage piles were small. The observations of the influence of far-field and near-field ground motions indicated that the seismic response of near-field ground motion was more significant than that of far-field ground motion, but the effect of far-field ground motion could not be disregarded. The results of these tests could provide useful information for the design of rigid-drainage pile groups in a typical pile-superstructure-quay wall system.

中文翻译：

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横向扩展作用下刚性排水桩-上部结构-岸墙体系的地震响应

众多震害实例表明，液化横向扩展是桩基破坏的主要原因。刚性排水桩采用塑料排水板安装两条排水槽，是一种兼顾承载力和排水功能的新型抗液化桩。在本文中，进行了一系列 1-g 振动台试验，以分析受横向扩展影响的刚性排水桩-上部结构-码头 (RSQ) 墙系统的地震响应。研究了三个级别的地震烈度，包括小地震（峰值地面加速度，PGA=0.05 g）、中地震（PGA=0.1 g）和大地震（PGA=0.2 g）。对比分析了刚性排水桩抗液化性能的提高。而且，还讨论了远场和近场地面运动的影响。试验结果表明，刚性排水桩能有效降低砂层的液化程度和水平流动。另外，建在排水桩上的上部结构内力小，位移小。远场和近场地震动影响的观测表明，近场地震动的地震响应比远场地震动更显着，但远场地震动的影响不能被忽略。无视。这些试验的结果可为典型桩-上部结构-岸墙体系中刚性排水桩群的设计提供有用的信息。试验结果表明，刚性排水桩能有效降低砂层的液化程度和水平流动。另外，建在排水桩上的上部结构内力小，位移小。远场和近场地震动影响的观测表明，近场地震动的地震响应比远场地震动更显着，但远场地震动的影响不能被忽略。无视。这些试验的结果可为典型桩-上部结构-岸墙体系中刚性排水桩群的设计提供有用的信息。试验结果表明，刚性排水桩能有效降低砂层的液化程度和水平流动。另外，建在排水桩上的上部结构内力小，位移小。远场和近场地震动影响的观测表明，近场地震动的地震响应比远场地震动更显着，但远场地震动的影响不能被忽略。无视。这些试验的结果可为典型桩-上部结构-岸墙体系中刚性排水桩群的设计提供有用的信息。排水桩上建的上部结构内力小，位移小。远场和近场地震动影响的观测表明，近场地震动的地震响应比远场地震动更显着，但远场地震动的影响不能被忽略。无视。这些试验的结果可为典型桩-上部结构-岸墙体系中刚性排水桩群的设计提供有用的信息。排水桩上建的上部结构内力小，位移小。远场和近场地震动影响的观测表明，近场地震动的地震响应比远场地震动更显着，但远场地震动的影响不能被忽略。无视。这些试验的结果可为典型桩-上部结构-岸墙体系中刚性排水桩群的设计提供有用的信息。