Seismic deformation characteristics of liquefaction soil-irregular section underground structure

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (11) : 217-225.

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

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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.

Key words

liquefaction ground

/ irregular section subway station / shaking table test / excess pore water pressure / foundation deformation characteristic

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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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