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Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
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Volume 14, issue 8 | Copyright
Nat. Hazards Earth Syst. Sci., 14, 2079-2088, 2014
https://doi.org/10.5194/nhess-14-2079-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 14 Aug 2014

Research article | 14 Aug 2014

New improvement of the combined optical fiber transducer for landslide monitoring

Z.-W. Zhu1,2, Q.-Y. Yuan3, D.-Y. Liu1,2, B. Liu4, J.-C. Liu4, and H. Luo1,2 Z.-W. Zhu et al.
  • 1College of Civil Engineering of Chongqing University, Chongqing, 400045, China
  • 2Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University, Ministry of Education, Chongqing, 400045, China
  • 3Department of Geriatrics, Southwest Hospital, the Third Military Medical University, Chongqing, 400038, China
  • 4College of Electro-optic Engineering of Chongqing University, Chongqing, 400044, China

Abstract. Landslide monitoring is important in predicting the behavior of landslides, thereby ensuring environmental, life, and property safety. On the basis of our previous studies, we conducted the double shear test by using a third-generation optical fiber transducer that uses expandable polystyrene (EPS) as base material. However, the third-generation transducer has poor performance when cohesive force is present between the grout and capillary stainless steel pipe of the transducer. Thus, the fourth-generation optical fiber transducer was invented. Similar to the third-generation transducer, the fourth-generation transducer also used EPS as its base material. Single shear test was conducted on the fourth-generation transducer after being grouted with cement mortar (1 : 1 mix ratio). The micro-bend loss mechanism of the optical fiber was considered, and the optical time domain reflectometry instrument was used. The fact that the loss sequence of optical fibers subjected to loading is different at various locations is found. The relationship of the loading-point displacement vs. optical fiber sliding distance and optical loss were measured. Results show that the maximum initial measurement precision of the newly proposed device is 1 mm, the corresponding sliding distance is 21 mm, and the dynamic range is 0–20 mm. The fourth-generation transducer can measure the movement direction of loadings, thus making this transducer applicable for landslide monitoring.

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