Laboratory procedure of fiber optic measurement line control for rockburst hazard prediction

Rockburst hazard in deep-level mining is yet one of the most difficult problems in real-time prediction of seismic events: microseismic monitoring chiefly captures the dynamic stage of failure while nucleation of an unsafe condition may be accompanied by long-term accumulation of quasi-static strains. This article proposes an approved laboratory procedure of fiber optic measurement line control as a complimentary tool for microseismic deformation monitoring. The measurement line (single mode fiber G.652, 60 m) contains a local sensitive stretch in the form of a controllable macrobend where a reproducible reflectometry event (local increased losses) is captured. The control method was the optical time–domain reflectometry at the wavelengths of 1310 and 1550 nm. The input dynamic effect was set and controlled by a triaxial sensor, and the sensor data were used to normalize the levels and reproducibility of the impact series. Based on the results, the calibration scale is constructed for the sensitive stretch conditions, the repeatability of additional losses in re-installation of the line is estimated, and also it is shown that the influence of the impact series on the measurement line condition shows up in the sharp bend and is absent in the moderate bend. The scientific novelty of the research lies in the reproducible lab-scale procedure for measurement line condition control and in the set of diagnostic properties (coordinate of an event, additional losses at two wavelengths, difference of the losses and their pre-impact/post-impact change) suitable for the transfer to underground conditions and for the integration with the microseismic data. 

Konurin A. I., Orlov D. V. Laboratory procedure of fiber optic measurement line control for rockburst hazard prediction. MIAB. Mining Inf. Anal. Bull. 2026;(10):141-155. [In Russ]. DOI: 10.25018/0236_1493_2026_10_0_141.

The study was supported by the Russian Science Foundation, Grant No. 25-27-00034.

A.I. Konurin¹, Cand. Sci. (Eng.), Senior Researcher, e-mail: konurin@misd.ru, ORCID ID: 0000-0003-3373-2382,
D.V. Orlov¹, Graduate Student, Engineer, e-mail: dmiorl@gmail.com,
¹ N.A. Chinakal Institute of Mining, Siberian Branch of the Russian Academy of Sciences, 630091, Novosibirsk, Russia.

A.I. Konurin, e-mail: konurin@misd.ru.

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