地震作用隧道正交下穿滑坡体衬砌结构的动力响应试验研究

doi:10.13722/j.cnki.jrme.2021.0542

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Abstract With the main traffic routes cross complex and dangerous mountainous areas，more and more tunnels face the problem of under-crossing a landslide. The tunnel deformation in a unstable slope body due to potential earthquake has become one of the major hidden dangers to the operation and maintenance of the traffic tunnel in this area. In this paper，a typical case of tunnel orthogonal under-crossing landslide was taken for the first time to carry out the shaking table test，and the multi-attribute seismic data information such as characteristic image，acceleration，dynamic soil pressure and dynamic strain under different probability level seismic action were obtained. Through the model deformation characteristics and the time-domain characteristics analysis of the acceleration，the dynamic soil pressure and the dynamic strain，the regional spatial dynamic response characteristics of the lining were revealed. Based on multi-attribute seismic data comprehensive analysis，the time-frequency relationships among multi-attribute seismic data were obtained and the correlation between orthogonal tunnel and landslide damage level characterized by spectrum characteristics of different probability levels was proposed. The results show that：(1) The sensitivities of multi-attribute data such as the acceleration，the dynamic soil pressure and the dynamic strain under earthquake action are greatly different. The time-history effect of the dynamic soil pressure is the most sensitive，and the time-history effect of the dynamic strain has obvious lag effect compared with acceleration time-history. (2) Due to the spatial position relationship of the tunnel under-crossing the landslide and the influence of seismic effect，the damage sites of the lining have regional differences，and the cracking inverted arch becomes the weak area. (3) The dynamic soil pressure presents two intermittent jumps. The deformation of the lining is mainly controlled by the first wave of the dynamic soil pressure. The plastic deformation of the lining is completed in the first wave，and the second wave peak causes the residual dynamic soil pressure of the tunnel lining. (4) The excellent frequencies in the frequency domain of the multi-attribute seismic data signal are mainly concentrated in 1‐10 Hz，but the respective dominant frequencies are significantly different. The singular size boundary between the low frequency band and the high frequency band is 10 Hz，and the frequency structure in the 15‐20 Hz band is safer. (5) There is a positive correlation between the multi-attribute seismic data response variables of the earthquake action. The acceleration and the dynamic soil pressure response have a high degree of correlation，and the correlation between the ground motion acceleration and the dynamic strain response is weak，showing a significant correlation. The research results can provide a theoretical reference for the prediction of deformation and failure modes of orthogonal tunnel-landslide in high seismic intensity areas and the evaluation of engineering safety.

Key words： tunnelling engineering orthogonal tunnel-landslide system seismic action shaking table test multi-attribute seismic data correlation wavelet transform

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	PAI Lifang1
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	WU Honggang2
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Cite this article:

PAI Lifang1,2,WU Honggang2, et al. Experimental study on dynamic response of tunnel lining structure orthogonal under-crossing a landslide under earthquake[J]. , 2022, 41(5): 979-994.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0542 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/I5/979

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