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Internal deformation monitoring for centrifuge slope model with embedded FBG arrays

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Abstract

The fiber Bragg grating (FBG) sensing technology was utilized for internal deformation monitoring in a centrifuge test of soil slope. An array of FBG sensors were encapsulated into a sensing fiber with a diameter of 0.9 mm. A pullout test was designed to investigate the frictional behavior between the sensing fiber and soil. It was concluded that, for a certain value of overburden pressure, the fiber strain is equal to the strain of soil as long as the fiber strain is less than its peak value in the pullout test. The sensing fibers were embedded directly into a slope centrifuge model to monitor the internal strain distribution and its variation. It can be found that the horizontal sensors were stretched extremely and the vertical sensors were compressed distinctly near a potential slip surface. Thus, it is possible to evaluate the soil internal deformation as well as the failure of the slope model by using FBG sensing technology. This is verified by a comparison between the results of FBGs and that of a numerical simulation. According to these preliminary results, discussions and recommendations for further research are presented.

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Acknowledgments

The authors gratefully acknowledge the financial support provided by the National Natural Science Foundation of China (41272315), the Opening Fund of State Key Laboratory of Geohazard Prevention and Geoenvironment Protection (Chengdu University of Technology (SKLGP2011K011), and the National Basic Research Program of China (973 Program Grant no. 2011CB710605). Financial support from the China Scholarship Council for an academic visit to the University of Cambridge and financial support from Lotus Unlimited Project for travel to Ghent University are acknowledged with deep appreciation. Many thanks to Suzhou NanZee Sensing Technology Co., Ltd. for the sensing fibers with FBGs and to MOI Beijing Representative Office for the FBG interrogator.

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Authors and Affiliations

  1. School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210023, China

    Dan Zhang & Hongxian Wang

  2. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection (SKLGP), Chengdu University of Technology, Changdu, 610059, China

    Qiang Xu & Guang Zheng

  3. Department of Civil Engineering, Ghent University, B-9052, Gent, Belgium

    Adam Bezuijen

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  1. Dan Zhang
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  2. Qiang Xu
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  3. Adam Bezuijen
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  4. Guang Zheng
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  5. Hongxian Wang
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Correspondence to Dan Zhang.

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Zhang, D., Xu, Q., Bezuijen, A. et al. Internal deformation monitoring for centrifuge slope model with embedded FBG arrays. Landslides 14, 407–417 (2017). https://doi.org/10.1007/s10346-016-0742-2

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  • DOI: https://doi.org/10.1007/s10346-016-0742-2

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