Application of Distributed Optical Fiber Sensing Technology in the Anomaly Detection of Shaft Lining in Grouting

Chunde Piao 1, Jun Yuan 1, Bin Shi 2, Haijun Lu 3, and  Guangqing Wei 4

1 Resources and Geosciences College, China University of Mining and Technology, Xuzhou, Jiangsu 221116, china

2 Department of Geo-engineering & Geo-informatics, Nanjing University, Nanjing, Jiangsu 210023, China

3 Pingdingshan Coal Co., Ltd., Pingdingshan, Henan 467000, China

4 Suzhou Nanzee Sensing Technology Co.,Ltd., Suzhou, Jiangsu 215123, China

Journal of Sensors 2015 Article ID 678634

Abstract: The rupture of the shaft lining caused by grouting has seriously undermined the safety in coalmining. Based on BOTDR distributed optical fiber sensing technology, this paper studied the layout method of optical fiber sensors and the anomaly detection method of the deformation, and obtained the evolution law of shaft deformation triggered by grouting. The research results showed that the bonding problem of optical fiber sensors in damp environment could be effectively solved, by applying the binder consisting of sodium silicate and cement. Through BOTDR-based deformation detection, the real time deformation of the shaft lining caused by grouting was immediately spotted. By comparing the respective strain of shaft lining deformation and concrete deformation, the risk range of shaft lining grouting was identified. With the additional strain increment of the shaft lining triggered by each grouting, the saturated condition of grouting volume in strata was analyzed, providing an important technical insight into the field construction and the safety of the shaft lining.

Keywords: shaft lining, BOTDR, optical fiber sensors, anomaly detection


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