Vibration table tests on the acceleration response of a three-dimensional cross tunnel with small net spacing and small angle

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (18) : 298-306.

WU Honggang1,2,3, PAI Lifang2,4, PANG Weijun1,3, HE Changjiang5, ZHANG Xiongwei1,2, LI Dezhu5

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Abstract

Due to the limitation of topography, geological conditions and line direction, the net distance between the tunnels near the crossing becomes smaller and smaller, and the engineering problems become more and more complicated.In the paper, a shaking table test under three excitation conditions was carried out by taking Caomeigou 1# and Pandaoling 3D cross tunnels as an example.The acceleration response characteristics of the vault and the invert of the upper span tunnel under the influence of the underpass tunnel were analysed.The results show that: the upper span tunnel invert is affected by the wave field effect of adjacent tunnels, and the effective seismic duration is longer; under the influence of the underpass tunnel, the axial peak ratio of the arch of the upper span tunnel shows more obvious characteristics of non-linearity and non-stationariness; the dominant frequency bands of excellence are concentrated in 2-8 Hz and 12-20 Hz, and the values of excellence frequencies are 5.95 Hz and 16.32 Hz; there is difference between the superior displacement frequency and that on the acceleration response curve, so the damping performance of the structure should be improved.The damping ratio is suggested to be 20%.The research results provide a new idea for the seismic design of three-dimensional cross tunnels.

Key words

three-dimensional cross tunnel / shaking table test / acceleration response / spectral characteristics / response spectrum characteristic

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Honggang, PAI Lifang, PANG Weijun, HE Changjiang, ZHANG Xiongwei, LI Dezhu. Vibration table tests on the acceleration response of a three-dimensional cross tunnel with small net spacing and small angle[J]. Journal of Vibration and Shock, 2021, 40(18): 298-306

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