Experimental study on pullout performance of sensing optical fibers in compacted sand

Zhu, Hong‐Hu; She, Jun-Kuan; Zhang, Chengcheng; Shi, Bin

doi:10.1016/j.measurement.2015.05.027

Cited by 27 publications

(16 citation statements)

References 36 publications

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“…We previously demonstrated that the ratio of residual to peak ISS was not correlated with OP while the interfacial bond was highly sensitive to the OP29. Not unexpectedly, the ratio of residual to peak ISS appeared to be dry density- and water content-independent as well (Fig.…”

Section: Resultsmentioning

confidence: 77%

“…We previously showed that OP is a critical factor that affects the fibre–soil interfacial properties272829. Here we focused on the influence of density and water content of soil.…”

Section: Resultsmentioning

confidence: 99%

“…The ratio of residual to peak ISS has been considered to be an important indicator in soil deformation monitoring as this parameter helps us identify whether the optical fibre is in a valid working state from a field monitoring standpoint2829. We previously demonstrated that the ratio of residual to peak ISS was not correlated with OP while the interfacial bond was highly sensitive to the OP29.…”

Section: Resultsmentioning

confidence: 99%

“…The interaction between optical fibre and soil has therefore attracted considerable interest111927282930. Recently an integrated DFOSS- and photogrammetry-based performance evaluation of a small-scale model of sand foundation under surcharge loads has brought our attention to this issue (Supplementary Fig.…”

mentioning

confidence: 99%

“…suggested that pull-out tests can be an effective method to understand the interaction between optical fibre and soil. Subsequent research performed by our group has shown that the overburden pressure (OP) can effectively tighten the fibre–soil interfacial bond, thereby extending the measurement range of the optical fibre272829. However, this phenomenon was discovered in pull-out tests on small soil samples and the strain distribution along the optical fibre was not obtained during the failure process of fibre–soil interface.…”

mentioning

confidence: 99%

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Role of the interface between distributed fibre optic strain sensor and soil in ground deformation measurement

Zhang

Zhu

Shi

2016

Sci Rep

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Recently the distributed fibre optic strain sensing (DFOSS) technique has been applied to monitor deformations of various earth structures. However, the reliability of soil deformation measurements remains unclear. Here we present an integrated DFOSS- and photogrammetry-based test study on the deformation behaviour of a soil foundation model to highlight the role of strain sensing fibre–soil interface in DFOSS-based geotechnical monitoring. Then we investigate how the fibre–soil interfacial behaviour is influenced by environmental changes, and how the strain distribution along the fibre evolves during progressive interface failure. We observe that the fibre–soil interfacial bond is tightened and the measurement range of the fibre is extended under high densities or low water contents of soil. The plastic zone gradually occupies the whole fibre length when the soil deformation accumulates. Consequently, we derive a theoretical model to simulate the fibre–soil interfacial behaviour throughout the progressive failure process, which accords well with the experimental results. On this basis, we further propose that the reliability of measured strain can be determined by estimating the stress state of the fibre–soil interface. These findings may have important implications for interpreting and evaluating fibre optic strain measurements, and implementing reliable DFOSS-based geotechnical instrumentation.

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Section: Resultsmentioning

confidence: 77%

“…We previously showed that OP is a critical factor that affects the fibre–soil interfacial properties272829. Here we focused on the influence of density and water content of soil.…”

Section: Resultsmentioning

confidence: 99%