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首页> 外文期刊>Soil Dynamics and Earthquake Engineering >An elastic-wave-based full-wavefield imaging method for investigating defects in a high-speed railway under-track structure
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An elastic-wave-based full-wavefield imaging method for investigating defects in a high-speed railway under-track structure

机译：基于弹性波的全波场成像方法研究高速铁路轨道下结构中的缺陷

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In geotechnical engineering, defect detection for concrete structure can be simplified as a multi-layered media problem in most cases. The types of defects are mainly identified as cracks inside the concrete, interlaminar peeling, and loose bedding voids. The study of the wave propagation phenomenon in multiscale layered media and the effects on defects merits investigation. The present research focuses first on the analysis of this phenomenon using numerical methods. The wave propagation characteristics of the multi-layered model with defects are assessed with dynamic FEM analyses under three-dimensional conditions. The analysis is obtained in the time domain and allows the consideration of multiple wave reflections between layers. Based on this analysis, a full-wavefield imaging detection method is developed and then applied to reveal the defects in the under-track structure of a high-speed railway. This testing system integrates the point-source/point-receiver scheme with the multi-directional imaging technique to achieve an effect analogous to that achieved with scanning. It is equipped with an impacting hammer, a series of three-component velocity transducers and a signal capturing unit. To evaluate the feasibility of this system for detecting defects in the under-track structure of the high-speed railway, a full-scaled high-speed railway model test with pre-setting defection is conducted. The data are analyzed according to characteristics of waveform and wave energy. The average amplitude is used to evaluate the defect area. It is concluded that the full-wavefield imaging detection method exhibits high potential for inspecting the defects of the under-track structure of high-speed railways by imaging. (C) 2015 Elsevier Ltd. All rights reserved.
机译：在岩土工程中，大多数情况下，混凝土结构的缺陷检测可以简化为多层介质问题。缺陷的类型主要是混凝土内部的裂缝，层间剥离和疏松的垫层空隙。研究多尺度分层介质中的波传播现象及其对缺陷的影响，值得研究。本研究首先集中在使用数值方法分析这种现象。在三维条件下，通过动态有限元分析来评估具有缺陷的多层模型的波传播特性。该分析是在时域中获得的，并允许考虑层之间的多次波反射。在此基础上，提出了一种全波场成像检测方法，并将其应用于揭示高速铁路轨道下结构的缺陷。该测试系统将点源/点接收器方案与多方向成像技术集成在一起，以实现与扫描相似的效果。它配备有冲击锤，一系列三分量速度传感器和信号捕获单元。为了评估该系统检测高速铁路轨下结构缺陷的可行性，进行了具有预设缺陷的大规模高速铁路模型测试。根据波形和波能的特征分析数据。平均幅度用于评估缺陷区域。结论是，全波场成像检测方法具有很高的成像潜力，可用于检测高速铁路轨道下结构的缺陷。 （C）2015 Elsevier Ltd.保留所有权利。

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