高密度电法在卵石覆盖区中的应用研究
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摘要
在卵石覆盖区进行工程地质勘察主要有以下几种方法:地质钻探、折射波勘探、面波勘探和高密度电法。其中,地质钻探因为成孔难,所以勘探深度很有限;另外由于地震波在卵石覆盖区中的能量衰减非常快,因此折射波勘探和面波勘探效果也不佳。鉴于此,本文介绍了高密度电法原理,并从正演模拟出发,研究了高密度电法在卵石覆盖区进行工程勘察的可行性,并给出了两个应用实例。实践表明:高密度电法在勘察基岩面深度及起伏形态方面效果较好。
Commonly,there are the following means for engineering exploration:the geologic drilling,the refraction prospecting,the surface wave prospecting and the high-density resistivity tomography.The first method,because it is very difficult to drill a bore in cobble covered area,is seriously restricted in practical application.In addition,the refraction prospecting and the surface wave prospecting are either not effective,in that the amplitude of seismic waves reduces very rapidly when the waves propagate through the cobble covered area.In view of this,this paper presents the principle of high-density resistivity tomography,and demonstrates the efficiency of high-density resistivity tomography applied to engineering exploration in cobble covered area by giving a forward modeling.In the last of this paper,two applicative examples are mentioned,which substantiate the good use of high-density resistivity tomography when it is applied to detect the depth of bedrock surface and to trace the rolling shape of bedrock surface.
Commonly,there are the following means for engineering exploration:the geologic drilling,the refraction prospecting,the surface wave prospecting and the high-density resistivity tomography.The first method,because it is very difficult to drill a bore in cobble covered area,is seriously restricted in practical application.In addition,the refraction prospecting and the surface wave prospecting are either not effective,in that the amplitude of seismic waves reduces very rapidly when the waves propagate through the cobble covered area.In view of this,this paper presents the principle of high-density resistivity tomography,and demonstrates the efficiency of high-density resistivity tomography applied to engineering exploration in cobble covered area by giving a forward modeling.In the last of this paper,two applicative examples are mentioned,which substantiate the good use of high-density resistivity tomography when it is applied to detect the depth of bedrock surface and to trace the rolling shape of bedrock surface.
引文
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[3]雷宛,肖宏跃等.工程与环境物探[M].北京:地质出版社,2006.
[4]陈洪恩.厚砾石层覆盖区地震勘探技术与效果[J].中国煤田地质,2000,(6):55~56.
[5]刘晓东,张虎生等.高密度电法在工程物探中的应用[J].工程勘察,2001,(4):64~66.
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[7]董浩斌等.高密度电法的发展与应用[J].地质前缘,2003,10(1).
[2]王兴泰.工程与环境物探新方法新技术[M].北京:地质出版社,1996.
[3]雷宛,肖宏跃等.工程与环境物探[M].北京:地质出版社,2006.
[4]陈洪恩.厚砾石层覆盖区地震勘探技术与效果[J].中国煤田地质,2000,(6):55~56.
[5]刘晓东,张虎生等.高密度电法在工程物探中的应用[J].工程勘察,2001,(4):64~66.
[6]王兴泰.高密度电阻率法及其应用技术研究.[J]长春地质学院学报,1991,(3):341~344.
[7]董浩斌等.高密度电法的发展与应用[J].地质前缘,2003,10(1).
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