Dynamic response characteristics of foundation soil surrounding small-spaced vertical-overlapped tunnels excited by metro trains

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (22) : 223-227.

YOU Zhihui1，MA Longxiang2，NONG Xingzhong1，ZHANG Chao2

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Abstract

Under metro train loads, the foundation soil surrounding small-spaced vertical-overlapped metro tunnels is more likely to incur long-term deformation than that surrounding the common metro tunnel.With this context, the dynamic responses of the foundation soil surrounding small-spaced vertical-overlapped tunnels at a section of Chengdu Metro Line 6 was computed and analyzed by the 2.5-dimensional (2.5D) numerical method, and the dynamic response characteristics of the foundation soil under different train loads were clarified.The analysis results show that:① in the foundation soil near the tunnel, the vertical normal stress induced by the moving metro train is generally greater than other stress components, but the longitudinal shear stress induced by the moving train also has a considerable magnitude;② the metro train that operates in the upper tunnel will cause considerable principal compressive stress in the foundation soil of the lower tunnel;③ compared with the arrival of a single train, the simultaneous arrival of two trains operating in both the upper and lower tunnels will significantly increase the dynamic stress in foundation soil; ④ sufficient attention should be paid to the long-term deformation and stability of the foundation soil of small-spaced vertical-overlapped metro tunnels during their operation. 

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vertical-overlapped tunnels / foundation soil / train load / vibration response / 2.5D approach

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YOU Zhihui1，MA Longxiang2，NONG Xingzhong1，ZHANG Chao2. Dynamic response characteristics of foundation soil surrounding small-spaced vertical-overlapped tunnels excited by metro trains[J]. Journal of Vibration and Shock, 2020, 39(22): 223-227

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