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首页> 外文期刊>Soil Dynamics and Earthquake Engineering >Mitigation measures for pile groups behind quay walls subjected to lateral flow of liquefied soil: Shake table model tests
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Mitigation measures for pile groups behind quay walls subjected to lateral flow of liquefied soil: Shake table model tests

机译：液化土横向流动对码头墙后群桩的缓解措施：振动台模型试验

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摘要

This paper presents experimental results of a series of lg shake table tests on mitigation measures for a model consisting of a 3 × 3 pile group and a sheet-pile quay wall in which the pile group was subjected to liquefaction-induced lateral spreading. First, general observations associated with the mechanism of lateral spreading and pile response are presented based on tests without remedial measures, followed by in depth discussions. Second, three remedial techniques were deployed to provide an adequate seismic performance of the pile group and the quay wall: (ⅰ) mitigating sheet pile of floating type, (ⅱ) mitigating sheet pile of fixed end type, and (ⅲ) anchoring the quay wall to a new pile row. The main objective of these mitigation methods was to restrict ground distortion behind the quay wall, enhancing seismic response of pile group and quay wall. This mitigation philosophy was decided based on the outcome of the first part, which consisted of a series of tests without mitigation measures. In addition, it should be noted that the proposed countermeasures were selected to be applicable for existing vulnerable pile groups, which are at risk of liquefaction and lateral spreading. Results of different mitigation tests are comparatively examined using a parameter called reduction factor, and the effectiveness of each countermeasure is discussed in detail. The results demonstrate that by applying the proposed mitigation measures the seismic performance of both pile group and quay wall can be improved, as a result of reduction in soil displacement and velocity of soil flow.
机译：本文介绍了一系列lg振动台试验的试验结果，该试验对由3×3桩组和板桩码头墙组成的模型进行了缓解措施，其中桩组受到液化引起的横向扩展。首先，在没有采取补救措施的试验的基础上，提出了与横向扩展和桩响应机制相关的一般观察，然后进行了深入讨论。其次，部署了三种补救技术以使桩组和码头墙具有足够的抗震性能：（ⅰ）减轻浮型板桩，（ⅱ）减轻固定端型板桩和（ⅲ）锚固码头墙到新的桩行。这些缓解方法的主要目的是限制码头墙后的地面变形，增强桩群和码头墙的地震响应。缓解策略是根据第一部分的结果决定的，该结果由一系列没有缓解措施的测试组成。此外，应注意的是，选择的拟议对策适用于存在液化和侧向扩散风险的现有易损桩组。使用称为“减少因子”的参数对不同缓解测试的结果进行了比较检查，并详细讨论了每种对策的有效性。结果表明，通过采用所提出的减缓措施，可以减少桩的位移和流速，从而改善桩群和码头墙的抗震性能。

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