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Detection of a slipping soil area in an open coal pit by embedded fibre-optic sensing rods

  • Movements in geological areas are mostly concentrated on faults or slipping zones. Detection of movements reaching critical values is of crucial importance to avoid losses and harms. The paper presents a new technology of detecting deformations and movements in soil or rock massifs. The core part of the sensing system is a tiny rod with embedded optical sensor fibres. This deformation measurement system was developed and the sensing rod can be installed in a borehole and enables the detection of beginning soil movements. The amount of deformation in soil or rock formations can then be estimated. The sensing rod has an outer diameter of 3 mm to 6 mm and contains several optical fibres. One fibre is used as online measurement system and provides integral strain information along the whole length of the rod. In case of a safety-relevant deformation (warning signal), the second sensing system based on fibre Bragg grating sensors positioned close to the expected shear zone will be activatedMovements in geological areas are mostly concentrated on faults or slipping zones. Detection of movements reaching critical values is of crucial importance to avoid losses and harms. The paper presents a new technology of detecting deformations and movements in soil or rock massifs. The core part of the sensing system is a tiny rod with embedded optical sensor fibres. This deformation measurement system was developed and the sensing rod can be installed in a borehole and enables the detection of beginning soil movements. The amount of deformation in soil or rock formations can then be estimated. The sensing rod has an outer diameter of 3 mm to 6 mm and contains several optical fibres. One fibre is used as online measurement system and provides integral strain information along the whole length of the rod. In case of a safety-relevant deformation (warning signal), the second sensing system based on fibre Bragg grating sensors positioned close to the expected shear zone will be activated and records then resulting deformations in detail.zeige mehrzeige weniger

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Autor*innen:Wolfgang Habel, Detlef Hofmann, H. Döring, H. Jentsch, A. Senze, G. Kowalle
Persönliche Herausgeber*innen:B. Shi
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Graue Literatur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):OSMG-2014 - 5th International forum on opto-electronic sensor-based monitoring in geo-engineering (Proceedings)
Jahr der Erstveröffentlichung:2014
Erste Seite:1
Letzte Seite:7
Freie Schlagwörter:Early warning; Fibre-optic strain sensor; Soil stability monitoring; Structural health monitoring
Veranstaltung:OSMG-2014 - 5th International forum on opto-electronic sensor-based monitoring in geo-engineering
Veranstaltungsort:Nanjing, China
Beginndatum der Veranstaltung:12.10.2014
Enddatum der Veranstaltung:14.10.2014
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:20.02.2016
Referierte Publikation:Ja
Datum der Eintragung als referierte Publikation:02.03.2015
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