2009
DOI: 10.1680/gein.2009.16.4.238
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Abstract: It is not easy to assess the stability of vertical soil walls reinforced by geogrids during and after construction. This paper describes a unique monitoring system called an ‘optical fibre sensor geogrid' in which an optical fibre sensor is installed within a longitudinal member of a geogrid reinforcement material. The structure of the optical fibre sensor and the measuring method to record strain in the geogrid are described. Laboratory tests were first carried out to assess the accuracy of geogrid strain mea… Show more

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Cited by 9 publications
(10 citation statements)
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“…However, the FBG sensors can only measure the geosynthetic strain at preassigned points (Guo et al, 2009). The distributed optical fiber sensors have the advantage of directly measuring the distributed strains along the length of an optical fiber (Bao et al, 1995(Bao et al, , 2001Wang et al, 2009;Yashima et al, 2009;Yoon et al, 2011).…”
Section: Introductionmentioning
confidence: 99%
“…However, the FBG sensors can only measure the geosynthetic strain at preassigned points (Guo et al, 2009). The distributed optical fiber sensors have the advantage of directly measuring the distributed strains along the length of an optical fiber (Bao et al, 1995(Bao et al, , 2001Wang et al, 2009;Yashima et al, 2009;Yoon et al, 2011).…”
Section: Introductionmentioning
confidence: 99%
“…In the past few decades, OFSs have already shown outstanding performances in health monitoring of civil infrastructures [2]- [4]. Recently, these sensors have been adopted to monitor strains or displacements of a variety of geotechnical structures, such as slopes [5]- [9], earth-retaining walls [10], foundations [11], tunnels [12]- [14], and dams [15]. These pilot case studies have greatly extended the real-world applications of these sensors, and have preliminarily verified their capability in condition evaluation of geo-structures.…”
mentioning
confidence: 99%
“…For example, the FBG sensor B4 readings were much smaller than the corresponding C-OFDR readings and were questionable as they had little change under all surcharge loads. The phenomenon that relatively small strains measured by point strain gauges and relatively large strains by distributed FOS gauges at the same locations were also reported in Yashima's work [15]. The differences of these readings have not been fully explained.…”
Section: Strain Monitoring Resultsmentioning
confidence: 75%
“…The distributed silica optic fibers and polymer optic fibers have been embedded into smart Geogrids for BOFDA (Brillouin Optical Frequency Domain Analysis) and OTDR (optical time domain reflectometry) based strain monitoring of dikes and slopes [11][12][13]. BOTDR (Brillouin optical time domain reflectometry) has also been used to obtain the distributed strain variations of geogrids monitor within model slope and reinforced soil walls in the field, respectively [14,15]. However, these early reported DFOS based technology could not realize accurate measurement of local deformation due to its relatively low spatial resolution.…”
Section: Introductionmentioning
confidence: 99%