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Site Characterization of an Abandoned Gold Mine Using the Multi-Channel Analysis of the Surface Waves Method

机译：使用表面波方法的多通道分析对废弃的金矿进行现场表征

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摘要

Geophysical methods and tools are becoming more widely used in the geotechnical and engineering arena. The non-invasive nature and capability to survey significant areas in a rapid and cost-efficient manner typically make them an attractive complementary tool to conventional drilling and invasive investigations. The multi-channel analysis of surface waves (MASW) is one method that has seen growing application in the geotechnical world. We present a case study from an assessment of a historic gold mine site in Colorado. The site was extensively mined in the late 19th and early 20th centuries and left a legacy of collapsed shafts and shallow, typically poorly documented, mine workings. The objective of the survey was to investigate the upper 30 to 50 feet of the subsurface to characterize potential collapsed or backfilled mine workings in advance of the construction of a new mill pond. A total of 40 MASW profiles were collected, along several 1000 foot sections of the targeted mineral veins across the site. While there are numerous surface expressions of old or collapsed shafts across the site, there was limited additional subsurface information to ground truth the geophysics. A significant number of targets in the subsurface were identified in the MASW profiles. A hazards map of the site was produced highlighting potential weak zones or void space in the subsurface for the ensuing earthworks and construction activities.
机译：地球物理方法和工具在岩土工程领域变得越来越广泛。非侵入性和以快速且经济高效的方式调查重要区域的能力通常使它们成为常规钻探和侵入性调查的有吸引力的补充工具。表面波的多通道分析（MASW）是一种在土力工程领域得到越来越广泛应用的方法。我们通过对科罗拉多州一个历史悠久的金矿场的评估提出了一个案例研究。该矿场在19世纪末和20世纪初广泛开采，留下了坍塌的竖井和浅层（通常文献记载不充分）的矿山开采的遗留物。这项调查的目的是在建造新的磨池之前调查地下30到50英尺的上部，以表征可能塌陷或回填的矿山作业。沿着该站点的目标矿脉的几千英尺段，总共收集了40个MASW轮廓。尽管整个站点上有许多旧的或坍塌的竖井的表面表现形式，但只有很少的额外地下信息才能使地球物理学成为现实。在MASW剖面中识别出了地下中的大量目标。绘制了该场地的危险图，突出显示了随后进行的土方工程和建筑活动的地下潜在薄弱区域或空隙。

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