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Title: Application of fiber optic sensors in pullout testing of model soil nails
Authors: Hong, CY
Yin, JH 
Pei, HF
Xu, DS
Issue Date: 2011
Source: Proceedings of the 14th Asian Regional Conference on Soil Mechanics and Geot. Engineering, Hong Kong, 23-27 May 2011, p. 444
Abstract: Soil nailing is an effective technique for stabilizing slopes, excavations and retaining walls. Reliable information with respect to stress, strain and displacement of soil nails is useful for analyzing the stability of geotechnical structures. This paper presents a typical study regarding the application of fiber optic sensor technologies in monitoring the mechanical behavior of model soil nails. These technologies include the Lower Coherence Interferometry (LCI), fiber Bragg grating (FBG) technology and Brillioun optic time domain analysis (BOTDA) technology. First, special and simplified calibration methods of different fiber optic sensors are introduced. Then instrumentation methods of different fiber optic sensors for strain measurement of soil nails are presented. Finally typical test observations and results are summarized and analyzed. Test results indicate the FBG strain sensor is appropriate for investigating the axial force/resistance distribution of a soil nail subjected to a pullout force. The LCI and BOTDA technologies are useful in the measurement of the average axial strain distribution/elongation of a soil nail.
Description: 14th Asian Regional Conference on Soil Mechanics and Geotechnical Engineering, ARC 2011, Hong Kong, 23-27 May 2011
Appears in Collections:Conference Paper

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