地质雷达隧道超前地质预报检测信号的HHT分析法

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Abstract Geological hazard accidents induced by excavation occur frequently in the course of tunnel constructions. In order to ensure tunnel construction safety，geological prediction for exploring potential geological conditions in front of tunnel face is widely adopted. Therefore，it is of vital importance to explore how to improve the interpretation level of geological prediction. Based on the characteristics of ground penetrating radar(GPR) signals in tunnel geological prediction，the Hilbert-Huang transform(HHT) method is used to extract instantaneous profiles of each IMF(intrinsic mode function) component in the original image and instantaneous parameters of the single trace signal，such as instantaneous amplitude，instantaneous phase and instantaneous frequency. The results show that instantaneous parameters decomposed by HHT method highlight the characteristics of the original signal，which can qualitatively identify the position and shape of catastrophic geological body，and improve the accuracy and credibility of the original image interpretation of ground penetrating radar.

Key words： tunnelling engineering geological prediction ground penetrating radar EMD method HHT analysis

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http://www.rockmech.org/EN/Y2012/V31/I7/1422

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