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Numerical modeling and experimental evaluation of a time domain UWB technique for soil void detection

机译:时域超宽带技术在土壤孔隙检测中的数值模拟与实验评估

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摘要

A growing percentage of waste and storm water conveyance systems are approaching or exceeded their design life, suffering from accelerated deterioration and subsequently increased rates of failure. Discontinuities in the pipe wall may lead to the formation of voids in the soil embedment surrounding it via the transportation of fine soil particles by infiltrating ground water. This paper describes a method that utilizes ultra wideband (UWB) time domain principles to detect the presence and location of soil voids in early stages of formation, thus preventing a catastrophic collapse of the pipe and/or a structure above it (e.g., road surface). A three dimensional numerical model simulating the propagation of UWB pulses within a buried pipeline was developed. The results from the numerical model were validated using experimental measurements performed utilizing a full scale test bed. It is shown that a UWB based sensory system is capable of detecting even minor voids around non-ferrous buried pipes.
机译:越来越多的废物和雨水输送系统已接近或超过其设计寿命,遭受了加速恶化和随后增加的故障率的困扰。管壁的不连续性可能会通过渗入地下水,通过输送细小的土壤颗粒而导致在其周围的土壤嵌入物中形成空隙。本文介绍了一种方法,该方法利用超宽带(UWB)时域原理来检测早期形成过程中土壤孔隙的存在和位置,从而防止管道和/或其上方结构(例如路面)发生灾难性倒塌)。建立了三维数值模型,模拟了UWB脉冲在地下管道中的传播。数值模型的结果通过使用全尺寸试验台进行的实验测量得到验证。结果表明,基于UWB的传感系统甚至能够检测有色金属地下管道周围的微小空隙。

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