地下障碍物探测井中地震散射波成像数值模拟
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摘要
井中地震具有多波接收、高精度、高分辨率、能量传播距离短、接近探测目标、避开低速带等优点,在工程中得到了越来越广泛的应用。地震散射波是由地下三维不均匀体引起的地震波的变化,因此散射波成像特征与不均匀体分布情况密切相关。采用声波方程有限差分法对城市地下不均匀体如桩基、深埋管道等的散射波成像特征进行了数值模拟和分析;根据理论模拟给出了多种探测方式,并讨论了各方式的适用条件及应注意的问题。为城市地下空间开发中地下障碍物探测提供了理论指导。
Borehole seismic imaging has been widely applied in a variety of engineering projects,and its advantages include multi-wave receiving,accuracy,high resolution,a short energy transfer distance,ease of use,and the avoidance of low-speed zones.Scattered seismic waves are generated when the original waves pass through subsurface 3D inhomogeneous layers,and the imaging characteristics of such scattered waves are closely related to the characteristics of the inhomogeneous body.This paper discusses the numerical simulation and analysis of the imaging features of scattered waves from typical inhomogeneous bodies in urban underground spaces(e.g.,piles and deep-buried tubes) by applying the finite difference method to the acoustic equation.Several detection methods are used in the theoretical simulations,with the relevant conditions and other important points highlighted for each method,and we present theoretical guidance for detecting underground obstructions in urban developments.
Borehole seismic imaging has been widely applied in a variety of engineering projects,and its advantages include multi-wave receiving,accuracy,high resolution,a short energy transfer distance,ease of use,and the avoidance of low-speed zones.Scattered seismic waves are generated when the original waves pass through subsurface 3D inhomogeneous layers,and the imaging characteristics of such scattered waves are closely related to the characteristics of the inhomogeneous body.This paper discusses the numerical simulation and analysis of the imaging features of scattered waves from typical inhomogeneous bodies in urban underground spaces(e.g.,piles and deep-buried tubes) by applying the finite difference method to the acoustic equation.Several detection methods are used in the theoretical simulations,with the relevant conditions and other important points highlighted for each method,and we present theoretical guidance for detecting underground obstructions in urban developments.
引文
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[2]王治华.地下空间地籍调查三维地震勘探技术应用研究[J].上海国土资源,2011,32(2):61-66.Wang Z H.Application of shallow3D seismic exploration technology in the cadastral survey of underground space in Shanghai[J].Shanghai Land&Resources,2011,32(2):61-66.
[3]孙秀容,夏学礼,赵东,等.双源面波数据采集与处理系统及其应用效果[J].上海国土资源,2011,32(3):87-92.Sun X R,Xia X L,Zhao D,et al.Dual-source surface wave data acquisition and processing system and its application effect[J].Shanghai Land&Resources,2011,32(3):87-92.
[4]杨振涛.非开挖管线探测方法及其适用性分析[J].上海国土资源,2011,32(2):67-70,78.Yang Z T.The methods and technology to detect the pipe laid by trenchless technology and applicability analysis[J].Shanghai Land&Resources,2011,32(2):67-70,78.
[5]饶险峰,王治华,孙正浩.地球物理技术在非开挖工程中的应用评价[J].上海地质,2007,28(2):52-55.Rao X F,Wang Z H,Sun Z H.The evaluation of geophysical technology application in trenchless engineering[J].Shanghai Geology,2007,28(2):52-55.
[6]上海市地质调查研究院.上海地球物理勘探技术应用与发展[M].上海:上海科学技术出版社,2010.Shanghai Institute of Geological Survey.The applicationand development of geophysical exploration technology in Shanghai[M].Shanghai:Shanghai Scientific&Technical Publishers,2010.
[7]曾来.井中地震CT观测系统研究[J].上海国土资源,2012,33(2):89-93.Zeng L.Improving the observation system for borehole seismic computed tomography(CT)[J].Shanghai Land&Resources,2012,33(2):89-93.
[8]Aki K,Wu R S.Scattering and attenuation of seismic wave[J].Pure and Applied Geophysics(Pageoph Topical Volumes),1988,128(1-2):1-447.
[9]尹军杰,刘学伟,李文慧.地震波散射理论及应用研究综述[J].地球物理学进展,2005,20(1):123-134.Yin J J,Liu X W,Li W H.The review of research on application and theory of the seismic wave scattering[J].Progress in Geophysics,2005,20(1):123-134.
[10]Aki K,Richards P G.Quantitative seismology theory and methods[M].San Francisco:Freeman W H and Company,1980.
[11]杜世通.地震波动力学[M].北京:石油大学出版社,1996.Du S T.Seismic wave dynamics[M].Beijing:China University of Petroleum Press,1996.
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