&lt;title&gt;Dynamic strain detection using a fiber Bragg grating sensor array for geotechnical applications&lt;/title&gt;

Schmidt‐Hattenberger, Cornelia; Naumann, Marcel; Borm, G.

doi:10.1117/12.508741

Cited by 2 publications

(1 citation statement)

References 3 publications

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“…The advantages of fiber optic sensors compared to conventional strain gauges are long-term performance, resistance to corrosive environments, immunity against electromagnetic interferences, array-capability by wavelength-demultiplexing, and miniaturized size. Hence, there is a practical demand to investigate the behaviour of open-ended concrete pipe piles jacked into silty clay considering soil plugging using novel fiber optic sensors [28].…”

Section: Introductionmentioning

confidence: 99%

Field Performance of Open-Ended Prestressed High-Strength Concrete Pipe Piles Jacked into Clay

Kou

Diao

Liu

et al. 2018

Sensors

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The behavior of open-ended pipe piles is different from that of closed-ended pipe piles due to the soil plugging effect. In this study, a series of field tests were conducted to investigate the behavior of open-ended prestressed high-strength concrete (PHC) pipe piles installed into clay. Two open-ended PHC pipe piles were instrumented with Fiber Bragg Grating (FBG) sensors and jacked into clay for subsequent static loading tests. Soil plug length of the test piles was continuously measured during installation, allowing for calculation of the incremental filling ratio. The recorded data in static loading test were reported and analyzed. The distribution of residual forces after installation and the effect on the bearing capacity were also discussed in detail. The test piles were observed to be in partially plugged condition during installation. The measured ultimate shaft resistance and total resistance of the test piles were 639 and 1180 kN, respectively. The residual forces locked in the test piles after installation significantly affected the evaluation of the axial forces, and thus the shaft and end resistances. It tended to underestimate the end resistances and overestimate the shaft resistances if the residual forces were not considered in the loading test. However, the residual forces did not affect the total bearing capacity of open-ended PHC pipe piles in this study.

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Section: Introductionmentioning

confidence: 99%

Field Performance of Open-Ended Prestressed High-Strength Concrete Pipe Piles Jacked into Clay

Kou

Diao

Liu

et al. 2018

Sensors

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Rockslide deformation monitoring with fiber optic strain sensors

Moore

Gischig

Button

et al. 2010

Nat. Hazards Earth Syst. Sci.

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Abstract. With micro-strain resolution and the capability to sample at rates of 100 Hz and higher, fiber optic (FO) strain sensors offer exciting new possibilities for in-situ landslide monitoring. Here we describe a new FO monitoring system based on long-gauge fiber Bragg grating sensors installed at the Randa Rockslide Laboratory in southern Switzerland. The new FO monitoring system can detect sub-micrometer scale deformations in both triggered-dynamic and continuous measurements. Two types of sensors have been installed: (1) fully embedded borehole sensors and (2) surface extensometers. Dynamic measurements are triggered by sensor deformation and recorded at 100 Hz, while continuous data are logged every 5 min. Deformation time series for all sensors show displacements consistent with previous monitoring. Accelerated shortening following installation of the borehole sensors is likely related to long-term shrinkage of the grout. A number of transient signals have been observed, which in some cases were large enough to trigger rapid sampling. The combination of short- and long-term observation offers new insight into the deformation process. Accelerated surface crack opening in spring is shown to have a diurnal trend, which we attribute to the effect of snowmelt seeping into the crack void space and freezing at night to generate pressure on the crack walls. Controlled-source tests investigated the sensor response to dynamic inputs, which compared an independent measure of ground motion against the strain measured across a surface crack. Low frequency signals were comparable but the FO record suffered from aliasing, where undersampling of higher frequency signals generated spectral peaks not related to ground motion.

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<title>Dynamic strain detection using a fiber Bragg grating sensor array for geotechnical applications</title>

Cited by 2 publications

References 3 publications

Field Performance of Open-Ended Prestressed High-Strength Concrete Pipe Piles Jacked into Clay

Field Performance of Open-Ended Prestressed High-Strength Concrete Pipe Piles Jacked into Clay

Rockslide deformation monitoring with fiber optic strain sensors

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