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Optical Engineering

Open pit slope deformation monitoring by fiber Bragg grating sensors
Author(s): Guoquan Xu; Daiyu Xiong; Yun Duan; Xiaoshuang Cao
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Paper Abstract

With microstrain resolution and the capability to sample at rates of 2000 Hz or higher, fiber Bragg grating (FBG) strain sensor offers exciting new possibilities for <italic<in situ</italic< deformation monitoring induced by blasting load in an open pit slope. Here, we are developing a new technology for measuring deformation in real time on the microstrain in an open pit slope during the blasting. A fiber optically instrumented rock mass strain sensor measured strain at 100-cm intervals along a two anchor rock bolt grouted in the slope intact rock mass. In field testing, a number of transient signals have been observed, which in some cases were large enough to trigger rapid sampling. The combination of short- and long-term observation offers new insight into the slope stability and blasting cumulative effects. Therefore, FBG sensors are a useful tool for measuring <italic<in situ</italic< strain in intact rock masses.

Paper Details

Date Published: 16 July 2014
PDF: 5 pages
Opt. Eng. 54(1) 011003 doi: 10.1117/1.OE.54.1.011003
Published in: Optical Engineering Volume 54, Issue 1
Show Author Affiliations
Guoquan Xu, Northeastern Univ. (China)
Beijing General Research Institute of Mining and Metallurgy (China)
Daiyu Xiong, Beijing General Research Institute of Mining & Metallurgy (China)
Yun Duan, Beijing General Research Institute of Mining & Metallurgy (China)
Xiaoshuang Cao, Beijing General Research Institute of Mining & Metallurgy (China)

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