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Article Dans Une Revue IEEE Transactions on Instrumentation and Measurement Année : 2015

Quantification of sub-millimeter displacements caused by sinkholes, using distributed optical fiber sensors

Edouard Buchoud
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Jerome I. Mars
Guy d'Urso
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Alexandre Girard
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Sylvain Blairon
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Jean-Marie Henault
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Résumé

—The estimation of sinkhole-induced ground displacement is an important issue for monitoring soil structures. Distributed optical fiber sensors composed of an interrogator based on scattering effects in an optical fiber cable sensing element can be used to assess ground displacement. These sensors provide longitudinal strain measurements of the soil structure. This article proposes a methodology that enables estimation of displacement fields in the soil structure when a sinkhole appears. It also exposes an experiment which was carried out to create an artificial sinkhole instrumented by optical fiber sensors. This is the first time that those sensors are used to provide sub-millimeter vertical displacements. The first step of the methodology is to model the ground displacement under two-dimensional conditions. The longitudinal strain measured by a distributed optical fiber sensor can thus be linked to the displacement of the structure. This model is described by those parameters: the spatial extent of the displacement signature; a coefficient that depends on the interface between the optical fiber cable and the soil; the depth of the sinkhole; and the maximal vertical displacement. The second step consists of the estimation of each parameter independently. The spatial extension is given by fitting the measured strain signature with the empirical model. The depth of the sinkhole can be determined by measurement of the spatial extension of the ground-displacement profile at several observation depths in the structure. Finally, the vertical maximal displacement is furnished with high precision.
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Dates et versions

hal-01190854 , version 1 (01-09-2015)

Identifiants

  • HAL Id : hal-01190854 , version 1

Citer

Edouard Buchoud, Valeriu Vrabie, Jerome I. Mars, Guy d'Urso, Alexandre Girard, et al.. Quantification of sub-millimeter displacements caused by sinkholes, using distributed optical fiber sensors. IEEE Transactions on Instrumentation and Measurement, 2015, pp.1-9. ⟨hal-01190854⟩
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