Imaging of train noise with heavy traffic events recorded by distributed acoustic sensing

IF 1.8 3区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
Hanyu Zhang, Lei Xing, Xingpeng Zheng, Tuanwei Xu, Dimin Deng, Mingbo Sun, Huaishan Liu, Shiguo Wu
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引用次数: 0

Abstract

Train noise is a kind of green, non-destructive and strong-energy artificial seismic sources, which is widely used in railway safety monitoring, near-surface imaging and urban underground space exploration. Distributed acoustic sensing is a new seismic acquisition technology, which has the advantages of dense sampling, simple deployment and strong anti-electromagnetic interference ability. In recent years, distributed acoustic sensing has been gradually applied in the fields of urban traffic microseism monitoring, crack detection and underground space imaging. However, previous studies mainly focused on microseism interferometry using train event coda noise, and there is limited research on the workflow of interferometry imaging using distributed acoustic sensing–based heavy train events noise (with short coda windows), which produces an abundant of near-source interference. Aiming at proving the effectiveness of this idea, we investigated a process workflow to get underground shear-velocity structure based on distributed acoustic sensing recorded heavy traffic noise near Qinhuangdao train station. A weighted sliding absolute average method is used to weaken the strong amplitude to the coda wave level and reduce the near-source influence. We demonstrated that the cross-coherence interferometry method, after spectral whitening, has the best effect on sidelobe suppression in the virtual source surface wave shot gathers, through a comparative analysis of cross-correlation and cross-coherence results. For obtaining concentrated energy and strong continuity in phase velocity spectra, we selected the time windows with high spatial coherence and signal-to-noise ratio not less than 1.2 for stacking from 720 time windows in FK domain. When dividing subarrays to extract pseudo-two-dimensional profile, we set the overlap rate between adjacent time windows to 80% to increase stacking times, enhancing the precision of phase velocity spectra and reducing the errors of picking dispersion curve. Our results show that heavy traffic train events noise (non-pure coda) can be used to detect underground velocity structure with clear dispersion and high inversion reliability. This research provides a new processing flow for distributed acoustic sensing train noise imaging and can be applied in future urban underground space exploration.

用分布式声学传感技术记录列车噪声与重型交通事件的图像
火车噪声是一种绿色、无损、强能的人工震源,广泛应用于铁路安全监测、近地表成像、城市地下空间探测等领域。分布式声学传感是一种新型的地震采集技术,具有采样密集、布设简单、抗电磁干扰能力强等优点。近年来,分布式声波传感已逐渐应用于城市交通微震监测、裂缝探测和地下空间成像等领域。然而,以往的研究主要集中在利用列车事件尾声噪声进行微震干涉成像,对利用基于分布式声学传感的重列车事件噪声(尾声窗口较短)进行干涉成像的工作流程研究有限,因为这种噪声会产生大量的近源干扰。为了证明这一想法的有效性,我们研究了基于分布式声学传感记录的秦皇岛火车站附近重载交通噪声获取地下剪切速度结构的工作流程。采用加权滑动绝对平均法将强振幅削弱到尾波水平,减少近源影响。通过对交叉相关和交叉相干结果的对比分析,我们证明了经过频谱白化后的交叉相干干涉测量法对虚拟声源面波射电集束的边扰抑制效果最好。为了获得能量集中、连续性强的相位速度谱,我们从 F-K 域的 720 个时间窗中选择了空间一致性高、信噪比不小于 1.2 的时间窗进行堆叠。在划分子阵列提取伪二维剖面时,我们将相邻时间窗之间的重叠率设置为 80%,以增加叠加次数,从而提高相位速度谱的精度,减少频散曲线拾取的误差。结果表明,重载交通列车事件噪声(非纯尾音)可用于探测地下速度结构,其频散清晰,反演可靠性高。这项研究为分布式声学传感列车噪声成像提供了一种新的处理流程,可应用于未来的城市地下空间探测。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Geophysical Prospecting
Geophysical Prospecting 地学-地球化学与地球物理
CiteScore
4.90
自引率
11.50%
发文量
118
审稿时长
4.5 months
期刊介绍: Geophysical Prospecting publishes the best in primary research on the science of geophysics as it applies to the exploration, evaluation and extraction of earth resources. Drawing heavily on contributions from researchers in the oil and mineral exploration industries, the journal has a very practical slant. Although the journal provides a valuable forum for communication among workers in these fields, it is also ideally suited to researchers in academic geophysics.
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