基于能量分析滑坡–隧道减震优化地震破坏特性试验研究

doi:10.13722/j.cnki.jrme.2022.0516

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Abstract In order to explore the damage and deformation characteristics of the tunnel structure across the landslide area under the action of earthquake，the seismic performance of the tunnel structure was improved by using the damping layer，the shaking table contrast test of the shock absorption optimization design of the tunnel under the main sliding surface was carried out for the first time. According to the dynamic response law of tunnel structure acceleration，an energy identification method based on Hilbert-Huang transform(HHT) and marginal spectrum was proposed to discuss the seismic damage deformation characteristics of tunnel structure，and the validity of this method was verified by peak Fourier spectrum amplitude(PFSA). The results show that：(1) The changes of seismic Hilbert spectrum and marginal spectrum energy can be used to identify the overall and local deformation of tunnel structure. The peak Hilbert spectrum interval of the tunnel structure has seismic wave frequencies of 15–17 Hz，while the peak marginal spectrum interval has seismic wave frequencies of 10–30 Hz. (2) The effect of the damping layer is obvious under the action of low intensity earthquake，but with the increase of earthquake intensity，the effect of the damping layer decreases，and the damping layer has a great influence on the spatial distribution of Hilbert spectrum peak, but has little influence on time and frequency. (3) The tunnel structure is firstly damaged by progressive cumulative damage in the arch region，and with the increase of seismic intensity，the damage site develops to the arch foot and elevation arch region，showing the continuous effect of spatial coupling deformation of regional damage and failure. (4) The seismic Hilbert energy of the high frequency component(＞30 Hz ) mainly causes local damage of tunnel structure，and the marginal spectral energy of the low frequency component(10–30 Hz) amplifies the seismic response of the surface slope. (5) Compared with the Hilbert energy spectrum, the marginal spectrum represents a certain Hilbert spectrum in each intrinsic mode function. It has rich frequency components and high recognition degree，which can clearly reflect the energy transfer and local seismic damage characteristics of the tunnel structure. The research results can provide a theoretical reference for the prediction of deformation damage mode of tunnel-landslide and the design of tunnel seismic mitigation technology in high seismic intensity areas.

Key words： slope engineering tunnel-landslide engineering shaking table test tunnel damping optimization Hilbert-Huang transform(HHT) marginal spectrum

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0516 OR http://rockmech.whrsm.ac.cn/EN/Y2023/V42/I4/879

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