隧道横穿主滑面系统“成灾模式–监测数据”双驱动地震损伤评价方法

doi:10.13722/j.cnki.jrme.2023.0700

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Abstract The mountain tunnel in the slope disease area of high intensity area is faced with the difficult problem of highly nonlinear，complex time-varying and multi-uncertainty earthquake response，which is difficult to be effectively dealt with by traditional analysis methods. The“model-data”dual-drive fusion is very important for efficient evaluation of lining damage behavior. In this paper，shaking table tests are carried out on the seismic damage and dynamic response characteristics of the tunnel crossing the main sliding surface，and the boundary effect of the vibration model and the evaluation method of the system dynamic characteristics are proposed. Based on the damage state of the model site soil，a“model-data”dual-drive fusion failure mode evaluation method based on marginal spectrum entropy is proposed combined with Hilbert-Huang transform(HHT) and information entropy theory. Based on EMD decomposition and HHT band energy spectrum，a“model-data”dual-drive fusion evaluation method for EMD energy damage index of lining is proposed. The rationality of the damage model evaluation method and EMD energy damage parameters is verified by testing the damage state of the site soil and lining after the earthquake. The results show that the overall failure mode of tunnel crossing sliding surface is the trailing edge settlement，the middle slip，and the leading-edge shear bulge. The slope failure process and slide surface location based on marginal spectrum entropy are basically consistent with the characteristics of slope failure process reproduced by shaking table test，which proves the reliability of the dual-drive fusion method. The HHT energy spectrum frequency of model site soil is mainly concentrated in 0–25 Hz. The peak time of HHT energy spectrum of lining(18.07 s) lags behind that of model site soil，and the instantaneous frequency of different characteristic parts is different. The distribution of the damage index is related to the spatial location of the lining characteristic parts，and the EMD energy damage index is more than 90% under the excitation strength of 0.4 g. Verified by the lining model，it shows that the damage location can be detected based on EMD energy damage index，and the damage degree can be roughly judged according to the sudden change of damage index. It provides a new perspective and paradigm to solve the problems of monitoring analysis and damage quantitative evaluation during tunnel construction and operation in slope disease section of high intensity area.

Key words： tunnel engineering tunnel crossing sliding surface earthquake action &ldquo disaster model-monitoring data&rdquo dual-drive information entropy theory Hilbert-Huang transform(HHT) damage assessment

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	Articles by authors
	PAI Lifang1
	2
	WU Honggang2
	3
	4
	LIANG Kexin5
	ZHOU Ping6

Cite this article:

PAI Lifang1,2,WU Honggang2, et al. Seismic damage assessment method of“disaster model-monitoring data”dual-drive for tunnel crossing main-sliding surface system[J]. , 2024, 43(S2): 3841-3860.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2023.0700 OR https://rockmech.whrsm.ac.cn/EN/Y2024/V43/IS2/3841

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