可液化地基-非规则截面地铁车站地震变形研究

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振动与冲击 ›› 2020, Vol. 39 ›› Issue (11) : 217-225.

论文

唐柏赞1,，李小军2,3，陈苏3，倪克闯4，景冰冰2

作者信息 +

Seismic deformation characteristics of liquefaction soil-irregular section underground structure

TANG Baizan1,LI Xiaojun2,3, CHEN Su3, NI Kechuang4, JING Bingbing2

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文章历史 +

摘要

以上层为五跨和下层为三跨的非规则截面地铁地下车站结构为原型，在可液化场地条件下进行土与地铁地下结构动力相互作用振动台试验。试验提出适用于液化地基-地下结构振动台模型试验的柔性传感链结合水沉法的模型地基制备方法，采用阵列式位移计测试了地基水平变形；分析了孔压发展、消散及空间分布规律，地震动强度与孔压关系，地表震陷与地基变形等。结果表明：饱和砂土振动孔压主要在地震过程中完成累积过程，振动孔压比与地震动Arias强度表现出显著的相关性；强震作用下地下结构存在改变了地基孔压空间分布模式；模型结构地震过程中出现了显著上浮现象，上浮不仅仅发生在孔压累积段，孔压消散段仍存在惯性上浮效应。随着液化区的扩展以及饱和砂土液化程度的增大，变截面地下结构不均匀沉降和倾斜现象显著，地下结构抗浮设计中应考虑截面结构形式差异性。

Abstract

Based on the prototype of irregular section subway station with five spans above and three spans below, a series of shaking table tests were performed to research the seismic deformation response in a liquefaction ground. A new method of foundation soil preparation based on water sinking method and flexible sensor chain was proposed, and the displacement meter array was used to measure the horizontal deformation of the ground. In this test, the development and spatial distribution pattern of excess pore water pressure and the deformation of the model foundation were analyzed both in the horizontal and vertical direction. The results show that excess pore water pressure is mainly accumulated during the seismic process. Meanwhile, the excess pore water pressure ratio is significantly correlated with Arias intensity. Besides, the spatial distribution pattern of excess pore water pressure is changed by the existence of underground structure. Additionally, the obvious upwelling of model structure occurs not only in the seismic process but also in the period of excess pore water pressure dissipation. With the expansion of the liquefaction area and the degree of soil liquefaction, the non-uniform subsidence and inclination of underground structure are remarkable, the difference of section form should be considered in anti-floating design of underground structure.

导出引用

唐柏赞1,，李小军2,3，陈苏3，倪克闯4，景冰冰2. 可液化地基-非规则截面地铁车站地震变形研究[J]. 振动与冲击, 2020, 39(11): 217-225

TANG Baizan1,LI Xiaojun2,3, CHEN Su3, NI Kechuang4, JING Bingbing2. Seismic deformation characteristics of liquefaction soil-irregular section underground structure[J]. Journal of Vibration and Shock, 2020, 39(11): 217-225

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