液化夹层对浅基础结构隔震响应影响分析
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三峡大学土木与建筑学院

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TU375.4

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土木工程防灾减灾湖北省引智创新示范基地(2021EJD026)


Analysis of effect of liquefaction interlayer on isolation response of shallow foundation structures
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School of Civil Engineering and Architecture, China Three Gorges University

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    摘要:

    砂土夹层液化既会造成地基失效破坏,又会对上部建筑起到减震作用,而覆盖层可以减小建筑沉降却会放大地震作用,因此考虑结构与土相互作用下液化夹层和覆盖层对建筑的隔震耦合影响十分有必要。采用有限元和有限差分耦合动力分析方法,分析了不同地震强度、砂土密实度Dr和液化层厚深比K(考虑液化夹层和覆盖层耦合作用)对上部结构的隔震的影响。结果表明:结构加速度谱比随震动强度增加先减小后趋于稳定,当震动强度超过某阈值时,液化层隔震效果不在增加;松砂(Dr=30%)的隔震效果优于中密砂(Dr=50%)和密砂(Dr=70%),但会产生不可忽略沉降危害,而密砂虽然会更好地抑制建筑沉降量,但在短周期内会起到加震作用;结合覆盖层和液化层的耦合作用,发现存在K值区间(0.3

    Abstract:

    A Liquefaction of sand interlayer will not only cause failure of the foundation, but also play a role in absorbing the shock of the superstructure, while the overburden can reduce the settlement of the building but amplify the earthquake effect. Therefore, it is necessary to consider the coupling effect of liquefaction interlayer and overburden on the isolation of the building under the interaction between structure and soil. finite element and finite difference coupling dynamic analysis methods are used to analyze the effects of different seismic intensity, sand density Dr And liquefaction layer thickness to depth ratio K (considering the coupling effect of liquefaction interlayer and overburden) on the isolation of superstructure. The results show that the structural acceleration spectrum ratio decreases first and then becomes stable with the increase of vibration intensity. When the vibration intensity exceeds a certain threshold, the isolation effect of the liquefied layer does not increase. loose sand (Dr=30 %) the isolation effect is better than that of medium-density sand (Dr=50 %) and dense sand (Dr=70 %), but it will cause non-negligible settlement hazards. In a short period, it will act as a seismic force. Combined with

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  • 收稿日期:2022-08-22
  • 最后修改日期:2023-03-23
  • 录用日期:2023-03-23
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