大地电磁测深进行隧道围岩分级的可行性研究
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摘要
研究目的:以往工作中,物探专业通过开展浅层地震折射法取得岩体纵波速度,但浅层地震折射法受理论以及震源能量限制无法取得深埋隧道洞身附近的岩体速度,使得围岩等级的划分缺少依据。寻求利用电性差异即应用大地电磁测深技术进行隧道围岩分级的研究是十分必要和迫切的。研究结论:浅层地震折射法在取得深埋隧道围岩的纵波速度方面存在很大限制;大地电磁测深法在铁路地质勘察中已成为主要方法,在电阻率区分上是有效的,其成果可以成为判断岩石完整性的依据,应用大地电磁测深技术进行隧道围岩分级是可行的。
Research purposes:In the past geophysical prospecting,the p-wave velocity of terrane was obtained with shallow seismic refraction method.But with the shallow seismic refraction method,the terrane velocity nearby the deep buried tunnel portal could not be obtained because of the limitations of the theory and the hypocenter energy source.In that way,there was no enough evidence to sort the surrounding rock.So,it is necessary and urgent to do the research on sorting the surrounding rock with the technology of telluric electromagnetic sounding.Research conclusions:There are some very big limitations for getting the p-waves of the surrounding rock of deep buried tunnel with the shallow seismic refraction method.Therefore,the telluric electromagnetic sounding sounding has become the major method for railway geological exploration.Using the telluric electromagnetic sounding can effectively distinguish the resistivity and its outcomes can be as the basis to judge the integrity of surrounding rock,so it is feasible to use the telluric electromagnetic sounding to sort the surrounding rock.
Research purposes:In the past geophysical prospecting,the p-wave velocity of terrane was obtained with shallow seismic refraction method.But with the shallow seismic refraction method,the terrane velocity nearby the deep buried tunnel portal could not be obtained because of the limitations of the theory and the hypocenter energy source.In that way,there was no enough evidence to sort the surrounding rock.So,it is necessary and urgent to do the research on sorting the surrounding rock with the technology of telluric electromagnetic sounding.Research conclusions:There are some very big limitations for getting the p-waves of the surrounding rock of deep buried tunnel with the shallow seismic refraction method.Therefore,the telluric electromagnetic sounding sounding has become the major method for railway geological exploration.Using the telluric electromagnetic sounding can effectively distinguish the resistivity and its outcomes can be as the basis to judge the integrity of surrounding rock,so it is feasible to use the telluric electromagnetic sounding to sort the surrounding rock.
引文
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[8]许广春,等.可控源音频大地电磁法(CSAMT)在隧道勘察中的应用[J].工程勘察,2008(6):68-71.Xu Guangchun,et al.Application of CSAMT Method on Tunnel Exploration[J].Geotechnical Investigation&Surveying,2008(6):68-71.
[9]陈乐寿.大地电磁测深资料处理与解释[M].北京:地质出版社,1989.Chen Leshou.Data Processing and Interpretation of Magnetotelluric Sounding Technology[M].Beijing:Geological Industry Press,1989.
[10]王若,王妙月.可控源音频大地电磁数据的反演方法[J].地球物理学进展,2003(2):197-202.Wang Ruo,Wang Miaoyue.Inversion Method of Controlled Source Audio-frequency Magnetotelluric Data[J].Progress in Geophysics,2003(2):197-202.
[11]胡祖志,胡祥云,吴文鹂,等.大地电磁二维反演方法对比研究[J].煤田地质与勘探,2005(1):64-68.Hu Zuzhi,Hu Xiangyun,Wu Wenli,et al.Compared Study of Two-Dimensional Magnetotelluric Inversion Methods[J].Coal Geology&Exploration,2005(1):64-68.
[12]雷达,孟小红,王书民,等.复杂地形条件下的可控源音频大地电磁测深数据二维反演技术及应用效果[J].物探与化探,2005(2):119-121.Lei Da,Meng Xiaohong,Wang Shumin,et al.The Two-dimensional Inversion Technique for Controllable Source Audio Frequency Magnetotelluric Sounding(CSAMT)Data Under Complex Topography and Its Effectiveness[J].Geophysical and Geochemical Exploration,2005(2):119-121.
[2]石昆法.可控源音频大地电磁法理论与应用[M].北京:科学出版社,1999.Shi Kunfa.The Theory and Application of CSAMT[M].Beijing:Science Press,1999.
[3]刘国栋.大地电磁测深研究[M].北京:地震出版社,1984.Liu Guodong.Magnetotelluric Sounding Research[M].Beijing:Earthquake Press,1984.
[4]王振东.浅层地震勘探应用技术[M].北京:地质出版社,1988.Wang Zhendong.Shallow Seismic Exploration Applied Technology[M].Beijing:Geological Industry Press,1988.
[5]底青云,等.可控源音频大地电磁数据正反演及方法应用[M].北京:科学出版社,2008.Di Qingyun,etc.Data Forward and Inverse and Application of Controlled Source Audio-frequency Magnetotelluric[M].Beijing:Science Press,2008.
[6]黄力军,陆桂福,张强,等.八家子铅锌矿电阻率异常特征及深部和外围找矿[J].物探与化探,2005(2):119-121.Huang Lijun,Lu Guifu,Zhang Qiang,etc.Resistivity Anomaly Characteristic and Deep and PeripheralProspecting in the Bajiazi Lead-zinc Mine[J].Geophysical and Geochemical Exploration,2005(2):119-121.
[7]于昌明.CSAMT方法在寻找隐伏金矿中的应用[J].地球物理学报,1998(1):133-138.Yu Changing.The Application of CSAMT Method in Looking for Hidden Gold Mine[J].Chinese Journal of Geophysics,1998(1):133-138.
[8]许广春,等.可控源音频大地电磁法(CSAMT)在隧道勘察中的应用[J].工程勘察,2008(6):68-71.Xu Guangchun,et al.Application of CSAMT Method on Tunnel Exploration[J].Geotechnical Investigation&Surveying,2008(6):68-71.
[9]陈乐寿.大地电磁测深资料处理与解释[M].北京:地质出版社,1989.Chen Leshou.Data Processing and Interpretation of Magnetotelluric Sounding Technology[M].Beijing:Geological Industry Press,1989.
[10]王若,王妙月.可控源音频大地电磁数据的反演方法[J].地球物理学进展,2003(2):197-202.Wang Ruo,Wang Miaoyue.Inversion Method of Controlled Source Audio-frequency Magnetotelluric Data[J].Progress in Geophysics,2003(2):197-202.
[11]胡祖志,胡祥云,吴文鹂,等.大地电磁二维反演方法对比研究[J].煤田地质与勘探,2005(1):64-68.Hu Zuzhi,Hu Xiangyun,Wu Wenli,et al.Compared Study of Two-Dimensional Magnetotelluric Inversion Methods[J].Coal Geology&Exploration,2005(1):64-68.
[12]雷达,孟小红,王书民,等.复杂地形条件下的可控源音频大地电磁测深数据二维反演技术及应用效果[J].物探与化探,2005(2):119-121.Lei Da,Meng Xiaohong,Wang Shumin,et al.The Two-dimensional Inversion Technique for Controllable Source Audio Frequency Magnetotelluric Sounding(CSAMT)Data Under Complex Topography and Its Effectiveness[J].Geophysical and Geochemical Exploration,2005(2):119-121.
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