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Online-detection of slipping soil areas by embedded fiber-optic sensing rods

  • Movements in geological areas are often caused by shear zones deep in the underground or by hardly observable slipping zones. Detection of movements reaching critical values is of crucial importance to avoid losses and harms. Optical sensor fibers with gauge lengths of several meters or even distributed fiber-optic sensors with gauge lengths of hundreds of meters allow detecting deformation of such zones with quite good resolution. 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 pultruded rod with an outer diameter of 3 mm to 6 mm. It contains two fiber-optic sensor systems. One sensor system is used for permanent online measurement and provides integral strain information along the whole length of the rod; in case of critical deformations, it provides a warning signal. The second sensing system uses fiber-optic Bragg grating (FBG) strain sensors located close to the expected shear zone.Movements in geological areas are often caused by shear zones deep in the underground or by hardly observable slipping zones. Detection of movements reaching critical values is of crucial importance to avoid losses and harms. Optical sensor fibers with gauge lengths of several meters or even distributed fiber-optic sensors with gauge lengths of hundreds of meters allow detecting deformation of such zones with quite good resolution. 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 pultruded rod with an outer diameter of 3 mm to 6 mm. It contains two fiber-optic sensor systems. One sensor system is used for permanent online measurement and provides integral strain information along the whole length of the rod; in case of critical deformations, it provides a warning signal. The second sensing system uses fiber-optic Bragg grating (FBG) strain sensors located close to the expected shear zone. This measurement system will be activated after the warning signal has been initiated by the integral strain measurement system. The FBG strain sensor system records then resulting deformations in detail. The sensing rod containing both sensor systems can be installed in a borehole to detect beginning soil movements automatically. The electronic equipment is powered by a solar panel; the amount of deformation in soil or rock formations can be estimated from the strain change measured in the sensor fibers. The effectiveness of this warning system will be shown using the example of a critically sliding slope in an open brown coal pit in Germany.zeige mehrzeige weniger

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Autor*innen:Wolfgang Habel, Frank Basedau, Detlef Hofmann, Katerina Krebber, H. Jentsch, A. Senze
Persönliche Herausgeber*innen:A. Ilki, M. Motavalli, P. Inci, M. Köhli
Dokumenttyp:Beitrag zu einem Tagungsband
Veröffentlichungsform:Verlagsliteratur
Sprache:Englisch
Titel des übergeordneten Werkes (Englisch):SMAR 2015 - 3rd Conference on smart monitoring, assessment and rehabilitation of civil structures (Proceedings)
Jahr der Erstveröffentlichung:2015
Erste Seite:Paper 222, 1
Letzte Seite:8
Freie Schlagwörter:Embedded sensor; Fibre-optic sensor; Maintenance; Monitoring; Reliability; SHM; Standardization
Veranstaltung:SMAR 2015 - 3rd Conference on smart monitoring, assessment and rehabilitation of civil structures
Veranstaltungsort:Antalya, Turkey
Beginndatum der Veranstaltung:07.09.2015
Enddatum der Veranstaltung:09.09.2015
ISBN:978-3-905594-65-2
Verfügbarkeit des Dokuments:Weder Datei noch physisches Exemplar vorhanden ("No Access")
Datum der Freischaltung:20.02.2016
Referierte Publikation:Nein
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