地震作用下立体交叉下穿隧道动力响应振动台试验研究

doi:10.13722/j.cnki.jrme.2020.0353

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Abstract With the continuous construction and planning of national road networks，a large number of close parallel or cross railway and highway tunnels has been emerging. Due to the limitations of topography，geological conditions and line strike，the engineering problems of near junction tunnels are more and more complicated. In this paper，taking the 3D crossing Strawberry Channel 1# and Pandaoling Tunnel as examples，especially the Pandaoling Tunnel(underpass tunnel) for the shaking table test，the acceleration and strain dynamic responses of the vault and inverted arch cross-section of ultra-small net spacing and small-angle underpass tunnels affected by the upper-span tunnel were analyzed. Specifically，the maximum seismic strain in the hoop direction was evaluated under the loading condition of 0.15 g peak acceleration of ground motion along the field，and according to the range of the effective frequency accelerometer and the input power spectrum amplitude and using the SPECTE response spectrum analysis program，the distributions of the acceleration response spectrum of the vault and inverted arch at the intersection central were compared. The results show that，affected by the spatial position of the 3D cross tunnel，the acceleration time history and spectrum of the ultra-small net spacing and small angle underpass tunnel are larger than the overall response of the inverted arch，the effective duration of vibration is longer and the spatial distribution is characterized by the prominent amplitude response of the arch. The peak acceleration response of the vault has a superposition effect and the peak acceleration ratio is obviously nonlinear and non-stationary. The higher the earthquake intensity is，the greater the strain response will be. The failure of the vault shows a transfer evolution form from the cross section to the river side then to the mountain side. With increasing the input seismic wave，the increases of the dynamic strain and the peak acceleration ratio of the inverted arch show local changes. The surrounding rock of the tunnel has filtering effect on the high frequency band of the seismic wave. The predominant main frequency markedly influencing the tunnel structure concentrates in two low frequency band of 1﹣10 Hz and 11﹣20 Hz，and the values of the predominant frequency corresponding to the maximum acceleration response of the vault and inverted arch are respectively 5 Hz and 12.5 Hz. For different seismic intensities，the peak strain at the vault are largest，followed by the inverted arch，and the arch waists of the riverside and the mountainside in turn. The predominant frequency of the acceleration response and the responses of the velocity and the displacement are affected by the base frequency and the damping，resulting in difference in time and space. It is suggested that he performance of the damping structure of the tunnel during the design process should be improved and the recommended damping ratio is 20%. The research results can provide certain theoretical guidance for the seismic design of 3D cross tunnels.

Key words： tunnelling engineering underpass tunnels shaking table test acceleration response strain response

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	PAI Lifang1
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	WU Honggang2
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Cite this article:

PAI Lifang1,2,3, et al. Shaking table test study on dynamic responses of underpass tunnels under earthquake[J]. , 2021, 40(1): 88-100.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0353 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I1/88

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