Investigation of guided wave propagation and attenuation in pipe buried in sand
Investigation of guided wave propagation and attenuation in pipe buried in sand
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DOI：
10.1016/j.jsv.2015.02.036
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发表时间：
2015-07-07
影响因子：
4.7
通讯作者：
Cawley, Peter
中科院分区：
文献类型：
--
作者：
Leinov, Eli;Lowe, Michael J. S.;Cawley, Peter
长距离导波检测是一种行之有效的管道腐蚀缺陷检测方法。该方法目前常规用于各种行业（例如，石化和能源）中的地上管道。当该方法应用于埋在土壤中的管道时，由于能量泄漏到嵌入土壤中导致的导波衰减，测试范围往往会受到显着影响和不可预测。利用实验室全尺寸实验装置和模型预测，研究了导波在埋于砂中的8英寸管道中的衰减特性。我们报告的衰减的T（0，1）和L（0，2）导波模式的测量范围内的砂条件，包括松散，压实，机械压实，水饱和和排水。在11-34 kHz的频率范围内，扭转和纵向模式的衰减值分别为1.65-5.5 dB/m和0.98-3.2 dB/m。上覆压力的施加改变了砂的压实度并增加了衰减。机械压实的砂产生类似的衰减值与所施加的上覆岩层压力。在完全水饱和的砂的衰减减少，并增加排水砂的值与压实砂获得的。衰减测量值与分散软件模型预测进行了比较，并证实了埋地管道中的衰减现象基本上是由砂中的体积剪切速度决定的。扭转导波模式的衰减行为被发现不被捕获由一个统一的土壤模型;与离散软件获得的预测比较表明，这可能是由于一层沙子粘附在管道的表面。(C)2015作者由Elsevier Ltd.发布。这是CC BY许可下的开放获取文章。
Long-range guided wave testing is a well-established method for detection of corrosion defects in pipelines. The method is currently used routinely for above ground pipelines in a variety of industries, e.g. petrochemical and energy. When the method is applied to pipes buried in soil, test ranges tend to be significantly compromised and unpredictable due to attenuation of the guided wave resulting from energy leakage into the embedding soil. The attenuation characteristics of guided wave propagation in an 8 in, pipe buried in sand are investigated using a laboratory full-scale experimental rig and model predictions. We report measurements of attenuation of the T(0,1) and L(0,2) guided wave modes over a range of sand conditions, including loose, compacted, mechanically compacted, water saturated and drained. Attenuation values are found to be in the range of 1.65-5.5 dB/m and 0.98-3.2 dB/m for the torsional and longitudinal modes, respectively, over the frequency of 11-34 kHz. The application of overburden pressure modifies the compaction of the sand and increases the attenuation. Mechanical compaction of the sand yields similar attenuation values to those obtained with applied overburden pressure. The attenuation decreases in the fully water saturated sand, and increases in drained sand to values comparable with those obtained for compacted sand. Attenuation measurements arc compared with Disperse software model predictions and confirm that the attenuation phenomenon in buried pipes is essentially governed by the bulk shear velocity in the sand. The attenuation behaviour of the torsional guided wave mode is found not to be captured by a uniform soil model; comparison with predictions obtained with the Disperse software suggest that this is likely to be due to a layer of sand adhering to the surface of the pipe. (C) 2015 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license.