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http://dx.doi.org/10.12989/gae.2015.9.3.397

Applications of BOTDR fiber optics to the monitoring of underground structures  

Moffat, Ricardo A. (Department of Civil Engineering, University of Chile)
Beltran, Juan F. (Department of Civil Engineering, University of Chile)
Herrera, Ricardo (Department of Civil Engineering, University of Chile)
Publication Information
Geomechanics and Engineering / v.9, no.3, 2015 , pp. 397-414 More about this Journal
Abstract
Three different applications for monitoring displacements in underground structures using a BOTDR-based distributed optical fiber strain sensing system are presented. These applications are related to the strain measurements of (1) instrumented PVC tube designed to be attached to tunnel side wall and ceiling as a sensor; (2) rock bolts for tunnels; and (3) shotcrete lining under loading. The effectiveness of using the proposed strain sensing system is evaluated by carrying out laboratory tests, in-situ measurements, and numerical simulations. The results obtained from this validation process provide confidence that the optical fiber is able to quantify strain fields under a variety of loading conditions and consequently use this information to estimate the behavior of rock mass during mining activity. As the measuring station can be located as far as 1 km of distance, these alternatives presented may increase the safety of the mine during mining process and for the personnel doing the measurements on the field.
Keywords
displacement sensors; mining; tunnels; instrumentation; optical fiber;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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