Evaluating Dark Fiber Distributed Acoustic and Strain Sensing for Shallow Ground Movement Monitoring: A Field Trial

被引:0
|
作者
Zhang, Cheng-Cheng [1 ]
Shi, Bin [1 ]
机构
[1] Nanjing Univ, Sch Earth Sci & Engn, Nanjing 210023, Peoples R China
来源
ENGINEERING GEOLOGY FOR A HABITABLE EARTH, VOL 2, IAEG XIV CONGRESS 2023 | 2024年
基金
中国国家自然科学基金;
关键词
Dark fiber monitoring; Distributed acoustic sensing (DAS); Distributed strain sensing (DSS); Near-surface deformation; Landslide detection;
D O I
10.1007/978-981-99-9061-0_47
中图分类号
TP39 [计算机的应用];
学科分类号
081203 ; 0835 ;
摘要
Fiber-optic distributed acoustic sensing (DAS) and distributed strain sensing (DSS) using dark telecom fibers enables low-cost monitoring of ground movements. However, the applicability of these methods for localized shallow failures using buried telecom cables requires evaluation. We assessed DAS and DSS performance using a conduit-installed dark fiber subjected to simulated shallow deformations and rockfalls. Brillouin optical time-domain reflectometry recorded DSS with and without events, showing negligible temperature influence. Once residual fiber slack dissipated, conduit-protected dark fiber responded to induced lateral strains. DAS detected rockfalls down to 25 Hz with amplitudes exceeding background noise by 2 orders, correlating with block mass. Preliminary results suggest dark fiber DAS can detect dynamic small-scale rockfalls. DSS provides quantitative strains immobilized to temperature once initial slack is taken up. Combined DAS-DSS may therefore monitor different timescale shallow movements. With development, such distributed sensing utilizing buried telecom infrastructure could enable low-cost near-surface failure monitoring. Further field validation is needed.
引用
收藏
页码:665 / 673
页数:9
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