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T. Bardainne, R. Tarnus, N. Deladerriere, C. Cai, A. Hallier, J. Boisson-Gaboriau, J. Valentin, O. Bouhdiche, "Permanent passive seismic monitoring of the near-surface ground beneath railways using trains as sources", in J. Pombo, (Editor), "Proceedings of the Fifth International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 1, Paper 10.14, 2022, doi:10.4203/ccc.1.10.14

Keywords: sinkhole, monitoring, surface wave, passive seismic.

Abstract

The deformation or collapse of tracks, due to sinkhole formation beneath railway platforms, is a natural hazard that can affect train traffic regularity, cause extra maintenance costs, but also lead to crucial safety issues. In this paper, we present an innovative seismic monitoring method that uses train as seismic sources. Thanks to interferometric methods and the reconstruction of virtual seismic traces between pairs of receivers, we use the surface waves generated by trains and recorded on a seismic sensor network to image the near-surface. Combined to an adapted design, a robust acquisition system and a deported processing system, this innovative geophysical methodology allows a near-real-time permanent and continuous measurement of seismic attributes. Hence, some geophysical attributes – like surface (Rayleigh) wave phase velocity dispersion curves – can be computed continuously and inverted to produce periodically S-wave velocity volumes. The fully automated process can provide, on a daily basis, a high-resolution (~2 m) S-wave velocity 3D volume of the shallow near surface (from 0 to about 50 m in depth). Then, analysis of the variation of S-waves velocity along time can be directly interpreted to track the genesis and growth of cavities due to leakage and dissolution phenomena. In this study, we show the results obtained after one year of continuous monitoring obtained with a wired accelerometer system. This allowed to observe S-wave velocity variations related to complex phenomena of leakage and decompression. Alternative acquisition systems (fiber optic using DAS technology for instance), processing methods (analyzing body-waves or back-scattering in addition to surface waves), or even different targets (to further optimize preventive maintenance operations) are possible and should be benchmarked soon.

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Front Page Browse CCC CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Conferences ISSN 2753-3239 CCC: 1 PROCEEDINGS OF THE FIFTH INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE Edited by: J. Pombo Paper 10.14 Permanent passive seismic monitoring of the near-surface ground beneath railways using trains as sources T. Bardainne¹, R. Tarnus¹, N. Deladerriere¹, C. Cai¹, A. Hallier², J. Boisson-Gaboriau², J. Valentin² and O. Bouhdiche³ ¹Sercel, France ²SNCF, France ³CGG, France doi:10.4203/ccc.1.10.14 Full Bibliographic Reference for this paper T. Bardainne, R. Tarnus, N. Deladerriere, C. Cai, A. Hallier, J. Boisson-Gaboriau, J. Valentin, O. Bouhdiche, "Permanent passive seismic monitoring of the near-surface ground beneath railways using trains as sources", in J. Pombo, (Editor), "Proceedings of the Fifth International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 1, Paper 10.14, 2022, doi:10.4203/ccc.1.10.14 Keywords: sinkhole, monitoring, surface wave, passive seismic. Abstract The deformation or collapse of tracks, due to sinkhole formation beneath railway platforms, is a natural hazard that can affect train traffic regularity, cause extra maintenance costs, but also lead to crucial safety issues. In this paper, we present an innovative seismic monitoring method that uses train as seismic sources. Thanks to interferometric methods and the reconstruction of virtual seismic traces between pairs of receivers, we use the surface waves generated by trains and recorded on a seismic sensor network to image the near-surface. Combined to an adapted design, a robust acquisition system and a deported processing system, this innovative geophysical methodology allows a near-real-time permanent and continuous measurement of seismic attributes. Hence, some geophysical attributes – like surface (Rayleigh) wave phase velocity dispersion curves – can be computed continuously and inverted to produce periodically S-wave velocity volumes. The fully automated process can provide, on a daily basis, a high-resolution (~2 m) S-wave velocity 3D volume of the shallow near surface (from 0 to about 50 m in depth). Then, analysis of the variation of S-waves velocity along time can be directly interpreted to track the genesis and growth of cavities due to leakage and dissolution phenomena. In this study, we show the results obtained after one year of continuous monitoring obtained with a wired accelerometer system. This allowed to observe S-wave velocity variations related to complex phenomena of leakage and decompression. Alternative acquisition systems (fiber optic using DAS technology for instance), processing methods (analyzing body-waves or back-scattering in addition to surface waves), or even different targets (to further optimize preventive maintenance operations) are possible and should be benchmarked soon. download the full-text of this paper (PDF, 6 pages, 773 Kb) go to the previous paper go to the next paper return to the table of contents return to the volume description
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