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16 July 2014Open pit slope deformation monitoring by fiber Bragg grating sensors

Guoquan Xu,Daiyu Xiong,Yun Duan,Xiaoshuang Cao

Guoquan Xu,^1,2 Daiyu Xiong,³ Yun Duan,³ Xiaoshuang Cao³

¹Northeastern Univ. (China)
²Beijing General Research Institute of Mining and Metallurgy (China)
³Beijing General Research Institute of Mining & Metallurgy (China)

Funded by:National High Technology Research and Development Program, National Nature Science Foundation of People’s Republic of China

Optical Engineering, Vol. 54, Issue 1, 011003 (July 2014).https://doi.org/10.1117/1.OE.54.1.011003

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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 forin situ 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 measuringin situ strain in intact rock masses.

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Guoquan Xu,Daiyu Xiong,Yun Duan, andXiaoshuang Cao"Open pit slope deformation monitoring by fiber Bragg grating sensors," Optical Engineering 54(1), 011003 (16 July 2014).https://doi.org/10.1117/1.OE.54.1.011003

Published: 16 July 2014

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