相邻道瞬态瑞雷波法在工程勘察中的应用
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摘要
常规相邻道频散曲线计算方法通常采用等频率间隔的快速傅里叶变换,其低频段频点采样间隔相对过大,导致深层信息成像能力较差。为了克服以上缺点,我们对相邻道频散曲线计算方法进行了改进,通过对瑞雷波记录进行频谱分析,确定计算频散曲线的频率区间,对频率区间按对数值等分,得到一系列变频率间隔的频率点,使高频到低频频点采样间隔逐渐变小,减小低频段的频率采样间隔,提高了瞬态瑞雷波法对低频段、深层结构的成像能力。通过实际工程应用,验证了该方法的正确性和有效性。
To overcome the disadvantages of common method in calculation dispersion curves,which discrete spacing oversize at low frequency area and low contrast resolution in the depths,we improve the calculation method of dispersion curves through equal section logarithm of the frequency range,and obtained a series of number frequency at vary frequency interval.Make the discrete frequency spacing reduced from higher frequency to lower frequency and can effectively reduce the discrete frequency spacing to promote the vertical resolution and depth exploration precision of transient Rayleigh wave at lower frequency.The method is proved to be correctness and affectivity by engineering application.
To overcome the disadvantages of common method in calculation dispersion curves,which discrete spacing oversize at low frequency area and low contrast resolution in the depths,we improve the calculation method of dispersion curves through equal section logarithm of the frequency range,and obtained a series of number frequency at vary frequency interval.Make the discrete frequency spacing reduced from higher frequency to lower frequency and can effectively reduce the discrete frequency spacing to promote the vertical resolution and depth exploration precision of transient Rayleigh wave at lower frequency.The method is proved to be correctness and affectivity by engineering application.
引文
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[2]白朝旭,刘洋,王典,等.瑞雷波测试技术在岩土工程中的应用研究[J].地球物理学进展,2007,22(6):1959-1965.BAI C X,LIU Y,WANG D,et al.The application of Rayleigh wave testing techniques in geotechnical engineering[J].Progress in Geophysics,2007,22(6):1959-1965.(In Chinese)
[3]田爱萍,柳亚千,戴彦杰,等.南口污水处理厂强夯处理地基瑞雷波检测[J].地球物理学进展,2009,24(4):1533-1539.TIAN A P,LIU Y Q,DAI Y J,et al.Rayleigh wave detection to dynamic consolidation at the nankou sewage treatment plant[J].Progress in Geophysics,2009,24(4):1533-1539.(In Chinese)
[4]田钢,石战结,Don.W.Steeples,等.多道面波分析方法在测量土壤压实度方面的应用研究[J].地球物理学进展,2003,18(3):450-454.TIAN G,SHI Z J,DON.W.STEEPLES,et al.The MASW method used in soil compaction study[J].Progress in Geophysics,2003,18(3):450-454.(In Chinese)
[5]葛双成,江影,颜学军.综合物探技术在堤坝隐患探测中的应用[J].地球物理学进展,2006,21(1):263-272.GE S C,JIANG Y,YAN X.Application of comprehensive geophysical exploration technique to hidden trouble detection of dyke[J].Progress in Geophysics,2006,21(1):263-272.(In Chinese)
[6]陈昌彦,白朝旭,宋连亮,等.多道瞬态瑞雷波技术在公路采空塌陷区探测中应用[J].地球物理学进展,2010,25(2):701-708.CHEN C Y,BAI C X,SONG L L,et al.Application of the multi-channel transient rayleigh wave method to highway goaf detection[J].Progress in Geophysics,2010,25(2):701-708.(In Chinese)
[7]罗莎,闫海新,李广智,等.瑞雷面波在防渗墙无损检测中的应用[J].地球物理学进展,2003,18(3):416-419.LUO S,YAN H X,LI G Z,et al.Rayleigh surfacewave application in harmless survey of seepage control wall[J].Progress in Geophysics,2003,18(3):416-419.(In Chinese)
[8]宋先海,肖伯勋,张学强,等.用改进后的τ-p变换算法提取瞬态瑞雷波频散曲线[J].物探与化探.2003.27(4):292-295.SONG X H,XIAO B X,ZHANG X Q,et al.The application of improvedτ-p transform algorithm to the extraction of dispersion curve of transient Rayleigh wave[J].Geophysical and Geochemical Exploration,2003,27(4):292-295(In Chinese)
[9]刘江平,罗银河,何伟兵.相邻道瞬态瑞雷面波法与压实度检测[J].岩土工程学报,2009(11):1652-1659.LIU J P,LUO Y H,HE W B.Method fo neighboring trace transient Rayleigh wave and its application in compactness inspection[J].Chinese Journal of Geotechnical Engineering,2009(11):1652-1659.(In Chinese)
[10]YINHE LUO.Research on Rayleigh-wave data processing technique with high horizontal resolution[D].Wuhan:China University of Geosciences,2008.
[11]张胜业,潘玉玲.应用地球物理学原理[M].武汉:中国地质大学出版社,2004.ZHANG S Y,PAN Y L.The principle of Applied Geophysics[M].Wuhan:China University of Geosciences Press,2004.(In Chinese)