探地雷达在斜坡震裂变形探测中的应用研究
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摘要
5.12汶川大地震造成了大量山体震裂变形,形成了众多次生潜在灾害。这类震裂变形的深部特征是控制斜坡稳定性和发展演化规律的关键。本文以探地雷达为主要手段,结合探槽开挖验证对比,选择实例震裂边坡,对震裂变形的深部特征及探地雷达图像显示特点进行了研究。研究结果认为,斜坡震裂变形破坏深度一般不超过2m,裂缝近垂直向下发育,少数微倾坡外,探地雷达反射图像显示为双曲线特征,总体构成封口状"八"字形。研究成果为快速、有效探测震裂裂缝,尤其是垂向裂缝的深部扩展特征提供了有效参考方法,同时也为防灾减灾提供了技术支撑。
5.12 WenChuan earquake led to large numbers of geohazards,and formed many potential hazards.The deep characteristics of shatter deformation are the key of controlling stability and development and evolution rules.With the Ground Penetrating Radar(GPR) as main method,and combined with exploratory trench cutting and verification contrast,selecting the shatter slopes as examples,this paper researched on the deep characteristics of shatter deformation and image display features of GPR.The research results think that the depth of shatter deformation doesn't exceed 2m in general,the crack develops downward vertical and only minority dip slope outside,and reflection images of GPR show hyperbola features,and as a whole the images form sealed Chinese character eight.The study results will provide the powerful reference method to probe deep characteristics of shatter crack rapidly and effectively,especially to vertical crack.Simultaneously,it still offers powerful technique support for hazard resistant and reduction.
5.12 WenChuan earquake led to large numbers of geohazards,and formed many potential hazards.The deep characteristics of shatter deformation are the key of controlling stability and development and evolution rules.With the Ground Penetrating Radar(GPR) as main method,and combined with exploratory trench cutting and verification contrast,selecting the shatter slopes as examples,this paper researched on the deep characteristics of shatter deformation and image display features of GPR.The research results think that the depth of shatter deformation doesn't exceed 2m in general,the crack develops downward vertical and only minority dip slope outside,and reflection images of GPR show hyperbola features,and as a whole the images form sealed Chinese character eight.The study results will provide the powerful reference method to probe deep characteristics of shatter crack rapidly and effectively,especially to vertical crack.Simultaneously,it still offers powerful technique support for hazard resistant and reduction.
引文
[1]杨成林,陈宁生,施蕾蕾.探地雷达在赵子秀山滑坡裂缝探测中的应用[J].物探与化探,2008,32(2):220~224.
[2]王秉中.计算电磁学[M].北京:科学出版社,2002.
[3]何兵寿,张会星.地质雷达正演中的频散压制和吸收边界改进方法[J].地质与勘探,2000,36(3):59~63.
[4]Cangellaris A C.Numerical stability and numerical dispersion ofa compact 2-D/FDTD method used for the dispersion analysis ofwaveguides[J].IEEE Microwave and Guided Wave Letters,1993,3(1):3~5.
[5]卢成明,秦臻,朱海龙等.探地雷达检测公路结构层隐含裂缝实用方法研究[J].地球物理学报,2007,50(5):1558~1568.
[6]杜良法,李先军.复杂条件下城市地下管线探测技术的应用[J].地质与勘探,2007,43(3):116~120.
[7]肖宏跃,雷宛,孙希薷等.隧道衬砌质量缺陷的探地雷达图像分析[J].工程勘察,2008,(8):56~59.
[8]刘国辉,董茂干,张建南.探地雷达技术在长城墙体检测中的应用[J].工程勘察,2006,(6):63~66.
[2]王秉中.计算电磁学[M].北京:科学出版社,2002.
[3]何兵寿,张会星.地质雷达正演中的频散压制和吸收边界改进方法[J].地质与勘探,2000,36(3):59~63.
[4]Cangellaris A C.Numerical stability and numerical dispersion ofa compact 2-D/FDTD method used for the dispersion analysis ofwaveguides[J].IEEE Microwave and Guided Wave Letters,1993,3(1):3~5.
[5]卢成明,秦臻,朱海龙等.探地雷达检测公路结构层隐含裂缝实用方法研究[J].地球物理学报,2007,50(5):1558~1568.
[6]杜良法,李先军.复杂条件下城市地下管线探测技术的应用[J].地质与勘探,2007,43(3):116~120.
[7]肖宏跃,雷宛,孙希薷等.隧道衬砌质量缺陷的探地雷达图像分析[J].工程勘察,2008,(8):56~59.
[8]刘国辉,董茂干,张建南.探地雷达技术在长城墙体检测中的应用[J].工程勘察,2006,(6):63~66.
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