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Point vibration measurements for the detection of shallow-buried objects

机译：点振动测量用于检测浅埋物体

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A major UK initiative, entitled 'Mapping the Underworld', is seeking to address the serious social, environmental and economic consequences arising from an inability to locate accurately and comprehensively the buried utility service infrastructure without resorting to extensive excavations. Mapping the Underworld aims to develop and prove the efficacy of a multi-sensor device for accurate remote buried utility service detection, location and, where possible, identification. One of the technologies to be incorporated in the device is low-frequency vibro-acoustics, and application of this technique for detecting buried infrastructure is currently being investigated. Here, the potential for making a number of simple point vibration measurements in order to detect shallow-buried objects, in particular plastic pipes, is explored. Point measurements can be made relatively quickly without the need for arrays of surface sensors, which can be expensive, time-consuming to deploy, and sometimes impractical in congested areas. At low frequencies, the ground behaves as a simple single-degree-of-freedom (mass-spring) system with a well-defined resonance, the frequency of which will depend on the density and elastic properties of the soil locally. This resonance will be altered by the presence of a buried object whose properties differ from the surrounding soil. It is this behavior which can be exploited in order to detect the presence of a buried object, provided it is buried at a sufficiently shallow depth. The theoretical background is described and preliminary measurements are made both on a dedicated buried pipe rig and on the ground over a domestic waste pipe. Preliminary findings suggest that, for shallow-buried pipes, a measurement of this kind could be a quick and useful adjunct to more conventional methods of buried pipe detection.
机译：英国一项名为“映射地下世界”的重要倡议正在寻求解决因无法准确，全面地定位被掩埋的公用事业服务基础设施而无法进行大规模挖掘而造成的严重社会，环境和经济后果。 Mapping the Underworld旨在开发和证明多传感器设备的功效，以进行准确的远程埋地公用事业服务检测，定位以及在可能的情况下进行识别。低频振动声学是该设备中的一项技术，目前正在研究将该技术用于检测地下基础设施。在此，探索了进行大量简单点振动测量以检测浅埋物体（特别是塑料管）的潜力。点测量可以相对快速地进行，而无需表面传感器阵列，这可能是昂贵的，部署耗时的，并且有时在拥挤的地区是不切实际的。在低频下，地面表现为具有定义明确的共振的简单单自由度（质量弹簧）系统，共振频率取决于局部土壤的密度和弹性。埋藏物体的存在会改变其共振，其性质不同于周围的土壤。可以利用此行为来检测掩埋物体的存在，前提是将其掩埋在足够浅的深度。描述了理论背景，并在专用的地下埋管钻机和生活污水管道的地面上进行了初步测量。初步发现表明，对于浅埋管道，这种测量可能是对更常规的地下管道检测方法的一种快速而有用的辅助手段。

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