Special Section on Fiber Lasers and Applications

Open pit slope deformation monitoring by fiber Bragg grating sensors

[+] Author Affiliations
Guoquan Xu

Northeastern University, Shenyan, China

Beijing General Research Institute of Mining and Metallurgy, Beijing 0086 100160, China

Daiyu Xiong

Beijing General Research Institute of Mining and Metallurgy, Beijing 0086 100160, China

Yun Duan

Beijing General Research Institute of Mining and Metallurgy, Beijing 0086 100160, China

Xiaoshuang Cao

Beijing General Research Institute of Mining and Metallurgy, Beijing 0086 100160, China

Opt. Eng. 54(1), 011003 (Jul 16, 2014). doi:10.1117/1.OE.54.1.011003
History: Received December 22, 2013; Revised March 20, 2014; Accepted March 21, 2014
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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 for in 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 measuring in situ strain in intact rock masses.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Guoquan Xu ; Daiyu Xiong ; Yun Duan and Xiaoshuang Cao
"Open pit slope deformation monitoring by fiber Bragg grating sensors", Opt. Eng. 54(1), 011003 (Jul 16, 2014). ; http://dx.doi.org/10.1117/1.OE.54.1.011003


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