考虑双向地震作用的无柱地铁车站振动台试验研究

doi:10.13722/j.cnki.jrme.2020.0104

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Abstract Due to that domestic subway stations are generally constructed with columns，there are rarely studies on the seismic performance of column-free stations under bidirectional earthquake actions. Taking a column-free subway station as the objective，large-scale simulation shaking table test of a long-span column-free subway station under different loading conditions was carried out considering soil-structure interaction and bidirectional earthquake actions to investigate dynamic responses of the station structure and the surrounding soil. The results show that the acceleration response of the model foundation increases with increasing the magnitude of the ground motion, and that the acceleration components in vertical and horizontal directions respectively play a leading role in the depth of the foundation and on the surface of the soil layer. As the magnitude of the ground motion increases，the fundamental frequency of the structure gradually decreases. Under the action of the horizontal ground motion，the 20﹣40 Hz high-frequency component of the Fourier spectrum of the acceleration response in the horizontal direction at the measuring points gradually increases and the low-frequency component is gradually filtered. The deformation of the middle plate of the model structure is large under the vertical earthquake action. The peak acceleration of the model structure under the bidirectional earthquake actions is greater than that under the unidirectional earthquake action. When the earthquake action is large，the soil and the structure interact violently，the bottom plate and the soil are separated and the earth pressure at the bottom of the model structure decreases. Under the action of earthquakes，the damage of the model structure is mainly concentrated at the junction of the roof and the side wall where slight cracks occur along the loading direction, indicating that the connection between the roof and the side wall of the column-free subway station and the middle plate are structurally weak locations and should be strengthened. Under the action of EL Centro wave with a peak acceleration of 0.484 g，the peak stress and the peak acceleration at the middle plate are respectively about 2.5 and 1.4–1.5 times of those under the unidirectional seismic action，so the influence of bidirectional seismic actions on the column-free subway station cannot be ignored.

Key words： tunnelling engineering bidirectional earthquake column-free metro station shaking table model test seismic time history analysis dynamic earth pressure

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	Articles by authors
	LI Jiangle1
	2
	WANG Sheliang1
	ZHANG Shirong3
	LIU Zhonghua1
	HAO Yanzhou1
	2

Cite this article:

LI Jiangle1,2,WANG Sheliang1, et al. Shaking table tests of column-free subway stations considering bidirectional earthquake actions[J]. , 2021, 40(5): 1056-1067.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0104 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I5/1056

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