new improvement of the combined optical fiber transducer for landslide monitoring
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ID: 173387
2014
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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.
| Reference Key |
zhu2014naturalnew
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|---|---|
| Authors | ;Z.-W. Zhu;Q.-Y. Yuan;D.-Y. Liu;B. Liu;J.-C. Liu;H. Luo |
| Journal | anziam journal |
| Year | 2014 |
| DOI |
10.5194/nhess-14-2079-2014
|
| URL | |
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