Shaking table tests for dynamic responses of crossing tunnels with small space clearances

LEI Hao1,2,3, WU Honggang2, QIAN Jiangu1, LAI Tianwen3, JI Zhiyang3, LIANG Yu3

Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (5) : 92-100.

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (5) : 92-100.

Shaking table tests for dynamic responses of crossing tunnels with small space clearances

  • LEI Hao1,2,3, WU Honggang2, QIAN Jiangu1, LAI Tianwen3, JI Zhiyang3, LIANG Yu3
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Abstract

To study the dynamic response of the 3d cross tunnel with small distance under the action of seismic loading, a shaking table model test with a similarity ratio of 1:50 was carried out. The experiment was designed and loaded with horizontal El-Centro seismic waves under 5 working conditions. The dynamic strain response of the tunnel was analyzed by collected test data, and the acceleration response of the intersecting and non-intersecting sections of the surrounding rock was compared and studied. Furthermore, the response spectrum theory was used to study the dynamic relationship between tunnel structure and ground motion. The test results showed that: the hoop and axial strain peaks of the upper-span tunnel are larger than those of the under-crossing tunnel. Owing to the influence of the upper-span tunnel and the compacting effect of surrounding rock, the impact of seismic waves on the under-crossing tunnel is weakened. The dynamic response of space crossing tunnel under seismic load has a certain " hysteresis ", and the seismic damage of upper-span tunnel occurs earlier and more serious. The acceleration amplification effect along the elevation direction of measuring points shows significant peak characteristics. Additionally, the acceleration response of the non-intersection is the strongest near the crown of the upper-span tunnel, while the intersection appears at the crown of the under-crossing tunnel. Furthermore, the amplitude of displacement response spectrum of each measuring point increases gradually with the increase of input seismic amplitude, and the predominant period also increases, that is, the predominant frequency decreases gradually. The response spectrum curves in the short period (0.5~1.5 s) under the action of low earthquakes (0.1g) have significant peak characteristics, while the response spectrum curves in the long period (3.0~5.0 s) under the action of strong earthquakes (0.6g) have obvious amplification effects along the elevation.

Key words

tunnel engineering / spatial cross tunnel / shaking table test / seismic response / response spectrum theory

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LEI Hao1,2,3, WU Honggang2, QIAN Jiangu1, LAI Tianwen3, JI Zhiyang3, LIANG Yu3. Shaking table tests for dynamic responses of crossing tunnels with small space clearances[J]. Journal of Vibration and Shock, 2023, 42(5): 92-100

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