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.
孟陆波. 隧道超前地质预报技术与计算机辅助预报系统研究[博士学位论文][D]. 成都：成都理工大学，2009.(MENG Lubo. Study on the tunnel fore geological forecast and its computer assistant system [Ph. D. Thesis][D]. Chengdu：Chengdu University of Technology，2009.(in Chinese))
<body>Your browse does not support frame!</body> " target="_blank">
[4]
张庆松，李术才，孙克国，等. 公路隧道超前地质预报应用现状与技术分析[J]. 地下空间与工程学报，2008，4(4)：766-771.(ZHANG Qingsong，LI Shucai，SUN Keguo，et al. Analysis and present state of advanced geological forecast technology of highway tunnel[J]. Chinese Journal of Underground Space and Engineering，2008，4(4)：766-771.(in Chinese))
<body>Your browse does not support frame!</body> " target="_blank">
[6]
钟世航. 陆地声纳法的原理及其在铁路地质勘测和隧道施工中的应用[J]. 中国铁道科学，1995，16(4)：48-55.(ZHONG Shihang. The principle and application of landsonar method in railway geological survey and tunnel construction[J]. China Railway Science，1995，16(4)：48-55.(in Chinese))
<body>Your browse does not support frame!</body> " target="_blank">
[10]
张义平，李夕兵，赵国彦，等. 基于HHT方法的硐室大爆破震动分析[J]. 岩石力学与工程学报，2005，24(增1)：4 784-4 789. (ZHANG Yiping，LI Xibing，ZHAO Guoyan，et al. Analysis of chamber blasting vibration based on HHT method[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(Supp. 1)：4 784- 4 789.(in Chinese))
<body>Your browse does not support frame!</body> " target="_blank">
[11]
HUANG N E，SHEN Z，LONG S R，et al. The empirical mode decomposition and the Hilbert spectrum for nonlinear and non- stationary time series analysis[J]. Proceedings of the Royal Society A：Mathematical，Physical and Engineering Sciences，1998，454：903-995.
<body>Your browse does not support frame!</body> " target="_blank">
邓世坤. 探地雷达野外工作参数选择的基本原则[J]. 工程地球物理学报，2005，2(5)：323-329.(DENG Shikun. On the basic principles for the choice of GPR field survey parameters[J]. Chinese Journal of Engineering Geophysics，2005，2(5)：323-329.(in Chinese)
<body>Your browse does not support frame!</body> " target="_blank">
[2]
李术才，李树忱，张庆松，等. 岩溶裂隙水与不良地质情况超前预报研究[J]. 岩石力学与工程学报，2007，26(2)：217-225.(LI Shucai，LI Shuchen，ZHANG Qingsong，et al. Forecast of karst- fractured groundwater and defective geological conditions[J]. Chinese Journal of Rock Mechanics and Engineering，2007，26(2)：217-225.(in Chinese))
李天斌，孟陆波，朱 劲，等. 隧道超前地质预报综合分析方法[J]. 岩石力学与工程学报，2009，28(12)：2 429-2 436.(LI Tianbin，MENG Lubo，ZHU Jin，et al. Comprehensive analysis method for advanced forecast of geology in tunnels[J]. Chinese Journal of Rock Mechanics and Engineering，2009，28(12)：2 429-2 436.(in Chinese))
<body>Your browse does not support frame!</body> " target="_blank">
[3]
王振宇，程围峰，刘 越，等. 基于掌子面编录和地质雷达的综合超前预报技术[J]. 岩石力学与工程学报，2010，29(增2)：3 549-3 557.(WANG Zhenyu，CHENG Weifeng，LIU Yue，et al. Synthetic advanced forecast technique based on geological logging for tunnel face and ground penetrating radar[J]. Chinese Journal of Rock Mechanics and Engineering，2010，29(Supp.2)：3 549-3 557.(in Chinese))
<body>Your browse does not support frame!</body> " target="_blank">
[8]
余志雄，薛桂玉，周创兵. 复信号分析技术及其在地质雷达数字处理中的应用[J]. 岩石力学与工程学报，2005，24(5)：798-802.(YU Zhixiong，XUE Guiyu，ZHOU Chuangbing. Application of complex signal analysis to process ground penetrating radar data[J]. Chinese Journal of Rock Mechanics and Engineering，2005，24(5)：798-802.(in Chinese))
[9]
张 华，刘 松，张志勇，等. 基于探地雷达信号处理的小波基选取研究[J]. 地球物理学进展，2009，24(3)：1 115-1 121.(ZHANG Hua，LIU Song，ZHANG Zhiyong，et al. Study on selection of wavelet basis based on processing of GPR signal[J]. Progress in Geophysics，2009，24(3)：1 115-1 121.(in Chinese))
<body>Your browse does not support frame!</body> " target="_blank">
[14]
向 玲，唐贵基，胡爱军. 旋转机械非平稳振动信号的时频分析比较[J]. 振动与冲击，2010，29(2)：42-45.(XIANG Ling，TANG Guiji，HU Aijun. Vibration signal?s time-frequency analysis and comparison for a rotating machinery[J]. Journal of Vibration and Shock，2010，29(2)：42-45.(in Chinese))
[18]
李凡异，狄帮让，魏建新，等. 碳酸盐岩溶洞成像宽度的地震物理模型分析[J]. 石油物探，2011，50(5)：425-429.(LI Fanyi，DI Bangrang，WEI Jianxin，et al. Seismic physical model analysis of the imaging width of carbonate caves[J]. Geophysical Prospecting for Petroleum，2011，50(5)：425-429.(in Chinese))
<body>Your browse does not support frame!</body> " target="_blank">
2012, Vol. 31 
