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首页> 外文期刊>Earthquake Engineering & Structural Dynamics >Response of a scale-model pile group for a jacket foundation of an offshore wind turbine in liquefiable ground during shaking table tests
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Response of a scale-model pile group for a jacket foundation of an offshore wind turbine in liquefiable ground during shaking table tests

机译：振动台试验期间液化研磨液体风力涡轮机夹克基础的响应响应

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摘要

To investigate the seismic response of a pile group during liquefaction, shaking table tests on a 1/25 scale model of a 2 x 2 pile group were conducted, which were pilot tests of a test project of a scale-model offshore wind turbine with jacket foundation. A large laminar shear box was utilized as the soil container to prepare a liquefiable sandy ground specimen. The pile group model comprising four slender aluminum piles with their pile heads connected by a rigid frame was designed with similitude considerations focusing on soil-pile interaction. The input motions were 2-Hz sinusoids with various acceleration amplitudes. The excess pore water pressure generation indicated that the upper half of the ground specimen reached initial liquefaction under the 50-gal-amplitude excitation, whereas in the 75-gal-amplitude test, almost entire ground was liquefied. Accelerations in soil, on the movable frames composing the laminar boundary of the shear box, and along the pile showed limited difference at the same elevation before liquefaction. After liquefaction, the soil and the movable-frame accelerations that represented the ground response considerably reduced, whereas both the movable frames and the piles exhibited high-frequency jitters other than 2-Hz sinusoid, and meantime, remarkable phase difference between the responses of the pile group and the ground was observed, all probably due to the substantial degradation of liquefied soil. Axial strains along the pile implied its double-curvature bending behavior, and the accordingly calculated moment declined significantly after liquefaction. These observations demonstrated the interaction between soil and piles during liquefaction.
机译：为了研究液化过程中桩基的地震反应，进行了2×2桩组的1/25比例模型的摇头桌试验，这是一个带夹克的规模近海风力涡轮机的试验项目的试验试验基础。将大型层状剪切箱用作土壤容器，以制备液态砂土样本。包括四个细长铝桩的绒绒组模型，其刚框架连接的绒头头部设计有重点放在土桩相互作用上的类似考虑因素。输入运动是2-Hz正弦曲线，具有各种加速度幅度。过量的孔隙水压力产生表明，在50 - 加热幅激励下，地样标本的上半部分达到了初始液化，而在75-加气幅度测试中，几乎整个地液化。土壤的加速度，在构成剪切箱的层边界的可移动框架上，沿着桩在液化前同样升高显示有限差异。在液化之后，土壤和可移动框架加速度表示地面响应显着降低，而可移动框架和桩均显示出除2-Hz正弦曲线以外的高频抖动，同时的响应之间的高频抖动，以及相同的响应之间的显着相位差观察到桩基和地面，这可能是由于液化土壤的实质性降解。沿着桩的轴向菌株暗示其双曲率弯曲行为，因此在液化后，所需的时刻显着下降。这些观察结果证明了液化过程中土壤和桩之间的相互作用。

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