废弃地下褐煤矿巷道的井间地震层析成像探测

G. Kritikakis, A. Vafidis, G. Tsilfidis, K. Papakonstantinou
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引用次数: 0

摘要

本工作介绍了沿雅典地铁2号线延伸线、Ilion-Anthoupolis地区(希腊)选定位置的井间地震层析成像地球物理测量结果。本次地球物理调查的目的是:1)探测地铁沿线选定位置的废弃地下褐煤矿巷道;2)绘制研究地点的地质构造和可能存在的断层;3)为隧道路径优化设计提供信息。在20个钻孔之间生成了11张总长度225.3m、总深度520m的地震层析图。利用井源BIS-SH在2 m间隔产生高度可重复的纵波,采用由12个接收器组成的水听器在1 m间隔和12通道地震仪组成的流线进行地震波记录。分别使用SeisImager2D和ReflexW进行首次到达拾取和旅行时间断层扫描。在2个地震剖面上发现低速异常,可能与废弃的地下褐煤矿巷道或完整的褐煤层有关。此外,揭示了未映射断层存在的迹象,并提出了一条新的隧道路径,以避免穿越断层带。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Crosshole seismic tomography for the detection of abandoned underground lignite mine galleries
Summary This work presents the results of crosshole seismic tomography geophysical survey at selected positions along the extension of Athens subway line #2, Ilion-Anthoupolis area (Greece). This geophysical survey aimed at: 1) the detection of abandoned underground lignite mine galleries at selected positions along subway line, 2) the mapping of geological formations and possible faults at the studied sites and 3) providing information for optimal design of tunnel path. Eleven (11) seismic tomograms of 225.3m total length and 520m total depth were generated between twenty (20) boreholes. The borehole source BIS-SH was utilized to produce highly repeatable compressional (P) waves at 2 m intervals and a hydrophone streamer consisted of 12 receivers at 1 meter intervals and a 12-channel seismograph were employed for seismic wave recording. First arrivals picking and travel time tomography were performed using SeisImager2D and ReflexW, respectively. Low velocity anomalies were found at 2 seismic sections, which probably are associated with abandoned underground lignite mine galleries or intact lignite layers. Moreover, indications for an unmapped fault presence revealed and a new tunnel path was proposed in order to avoid crossing the fault zone.
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