The potential of seismic methods for detecting cavities and buried objects: experimentation at a test site
The potential of seismic methods for detecting cavities and buried objects: experimentation at a test site
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DOI：
10.1016/j.jappgeo.2004.04.004
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发表时间：
2004-06
影响因子：
2
通讯作者：
G. Grandjean;D. Leparoux
中科院分区：
文献类型：
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作者：
G. Grandjean;D. Leparoux
土木工程和景观管理中反复出现的问题之一是检测自然和人工空洞，以减轻塌陷和地下沉降问题。一般来说，蛀牙的位置是未知的，要么是因为它们没有记录在数据库中，要么是因为没有可用的位置图。在这种情况下，地球物理方法可作为空腔探测的有效替代方法，特别是探地雷达（GPR）和地震方法，最近已获得相关结果。在实际条件下进行的许多研究表明，地震信号和空洞之间相互作用产生的特征受到复杂地质的影响，从而使它们难以解释。我们决定在物理条件下尽可能简单地分析这种相互作用，即在专门为此目的而建立的测试站点。试验场地采用均质材料和空等效体构成，使波长与非均质尺寸的比值与实际情况相符。在设计各种数据处理协议之前，数值模拟最初用于理解波与身体的相互作用。然后获取p波图像和表面波切片并进行处理。本文介绍了本实验所涉及的工作和相关结果，然后讨论了该研究的可靠性及其对未来地震项目的影响。©2004 Elsevier BV版权所有
One of the recurring problems in civil engineering and landscape management is the detection of natural and man-made cavities in order to mitigate the problems of collapse and subsurface subsidence. In general, the position of the cavities is not known, either because they are not recorded in a database or because location maps are not available. In such cases, geophysical methods can provide an effective alternative for cavity detection, particularly ground-penetrating radar (GPR) and seismic methods, for which pertinent results have been recently obtained. Many studies carried out under real conditions have revealed that the signatures derived from interaction between seismic signals and voids are affected by complex geology, thus making them difficult to interpret. We decided to analyze this interaction under physical conditions as simple as possible, ie, at a test site built specifically for that purpose. The test site was constructed of a homogeneous material and a void-equivalent body so that the ratio between wavelength and heterogeneity size was compatible with that encountered in reality. Numerical modeling was initially used to understand wave interaction with the body, prior to the design of various data-processing protocols. P-wave imagery and surface-wave sections were then acquired and processed. The work involved in this experiment and the associated results are presented, followed by a discussion concerning the reliability of such a study, and its consequences for future seismic projects.© 2004 Elsevier BV All rights reserved.