电磁波层析成像技术在复杂地质边坡工程勘察中的应用研究
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摘要
复杂的边坡工程地质条件决定了建设摩崖石刻工程的位置和规模,但边坡上发育的崩塌、坠石等地质灾害和多变的地形地貌条件严重影响了边坡地质工程勘察的安全性、准确性和勘察技术方法的有效性,本文应用孔间电磁波层析成像技术探测和评价边坡工程内破碎带、岩溶以及岩体完整性变化等地质工程问题以及地质解释的关键技术.电磁波衰减特征及电磁波衰减吸收系数的变化趋势和异常结构特征可以有效地反映边坡岩体内节理发育带、岩溶以及场区具控制作用的溶蚀断裂带的发育深度及影响范围,评价边坡岩体完整性的垂向分带和空间分区特征,为边坡工程建造提供科学依据.
The location and size of cliffside carvings is controlled by the complicated engineering geological structures of high slope.Safety and veracity of geotechnical investigation and validity of surveying techniques are limited owing to geological hazards and complicate landform in studying area.In this paper,some key techniques are studied in applying Electromagnetic Wave Tomography to investigating the distribution and depth of fissures and closely-spaced fissure zones,karst cave,and karst faults.Furthermore,the integrity of slope rockmass is evaluated according to the diversification characteristics of rock electromagnetic absorption coefficient.As a result,Electromagnetic Wave Tomography is valid to investigate the complicated geological structure of slope engineering.
The location and size of cliffside carvings is controlled by the complicated engineering geological structures of high slope.Safety and veracity of geotechnical investigation and validity of surveying techniques are limited owing to geological hazards and complicate landform in studying area.In this paper,some key techniques are studied in applying Electromagnetic Wave Tomography to investigating the distribution and depth of fissures and closely-spaced fissure zones,karst cave,and karst faults.Furthermore,the integrity of slope rockmass is evaluated according to the diversification characteristics of rock electromagnetic absorption coefficient.As a result,Electromagnetic Wave Tomography is valid to investigate the complicated geological structure of slope engineering.
引文
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[2]龙海丽,郝锦绮.自电位层析成像的理论与实验研究.地球物理学报,2005,48(6):1343-1349.Long H L,Hao J Q.Theoretical and experimental research onself-potential tomography.Chinese J.Geophys.(in Chinese),2005,48(6):1343-1349.
[3]闫永利,陈本池,赵永贵等.电阻率层析成像非线性反演.地球物理学报,2009,52(3):758-764.Yan Y L,Chen B C,Zhao Y G,et al.Nonlinear inversion forelectrical resistivity tomography.Chinese J.Geophys.(inChinese),2009,52(3):758-764.
[4]吴以仁,刑风桐.钻孔电磁波法.北京:地质出版社,1982:237.Wu Y R,Xing F T.Borehole Electromagnetic Wave Method(in Chinese).Beijing:Geological Press,1982:237.
[5]张旻舳,师学明.电磁波层析成像技术进展.工程地球物理学报,2009,6(4):418-425.Zhang M Z,Shi X M.Review of electromagnetic tomographytechnique.Chinese Journal of Engineering Geophysics(inChinese),2009,6(4):418-425.
[6]曹俊兴.双频电磁波电导率层析成像反演.地球物理学报,2001,44(Z1):199-205.Cao J X.Conductivity tomography using dual frequency EMdata.Chinese J.Geophys.(in Chinese),2001,44(Z1):199-205.
[7]刘昌铨,孙振国,李长法.层析成像技术在核反应堆地基勘察中的应用.物探与化探,2000,24(1):69-75.Liu C Q,Sun Z G,Li C F.The application of tomographicimaging technique to the foundation investigation of nuclearreactor.Geophysical and Geochemical Exploration(inChinese),2000,24(1):69-75.
[8]刘君利,卫福旺,李新等.堤坝质量检测中的层析成像技术.工程地球物理学报,2009,6(5):556-560.Liu J L,Wei F W,Li X,et al.Computerized tomographymethods for dam and embankment inspection.Chinese Journalof Engineering Geophysics(in Chinese),2009,6(5):556-560.
[9]李才明,张善法.电磁波层析成像阻尼因子引入与应用.地球物理学进展,2005,20(1):221-224.Li C M,Zhang S F.The application and estimate method ofdamping gene in the electromagnetic wave computerizedtomography.Progress in Geophysics(in Chinese),2005,20(1):221-224.
[10]林树海,赵立英.井间电磁波层析成像中的高精度时间域正演计算.地球科学-中国地质大学学报,2007,32(4):469-473.Lin S H,Zhao L Y.High precision time domain forwardmodeling for crosshole electromagnetic tomography.Earthscience-Journal of China University of Geosciences(inChinese),2007,32(4):469-473.
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