The design and verification test of dynamic model boxes for mountain tunnels crossing a bad geology region

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (8) : 80-87.

ZHAO Jianfeng，GAO Bo，FAN Kaixiang，ZHOU Pengfa，SHEN Yusheng

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Abstract

The design rationality of a model box has extremely influence on the reliability of dynamic response data of a tunnel structure in the study on a tunnel seismic simulation shaking table test.Based on the engineering with mountain tunnels crossing bad geology regions in high intensity seismic areas, the integral rigid model box of a tunnel crossing the base-overlying interface and the staggered rigid model box of the tunnel crossing the fault were designed.By modal analysis, soil-box resonance and bearing capacity of boxes were analyzed, and reinforcement cases were put forward to avoid the problems of resonance and insufficient bearing capacity.Moreover, a large-scale shaking table with dimension 8 m×10 m was adopted to test the dynamic response of mountain tunnels under two different conditions.The results show that model boxes have good boundary performance.The reliability of the results is improved, which lays the foundation for similar study on shaking a table test model box.

Key words

tunnel engineering / staggered rigid model box / integral rigid model box / modal analysis / high performance seismic simulation shaking table

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ZHAO Jianfeng，GAO Bo，FAN Kaixiang，ZHOU Pengfa，SHEN Yusheng. The design and verification test of dynamic model boxes for mountain tunnels crossing a bad geology region[J]. Journal of Vibration and Shock, 2019, 38(8): 80-87

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