Experimental Study on the Movement and Evolution of Overburden Strata Under Reamer-Pillar Coal Mining Based on Distributed Optical Fiber Monitoring

Chunde Piao, Shaogang Lei, Jiakun Yang and Lihong Sang
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Chunde Piao: School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China
Shaogang Lei: School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China
Jiakun Yang: School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China
Lihong Sang: School of Land Science and Technology, China University of Geosciences, Beijing 100083, China

Energies, 2018, vol. 12, issue 1, 1-12

Abstract: Focusing on the deterioration of the surface ecological environment caused by large-scale exploitation of the Jurassic coal field in northern Shaanxi, the three-dimensional similar material test model is made to simulate the extraction of shallow coal seam. Using Brillouin optical time-domain analysis (BOTDA) optical fiber distributed sensing technology, this paper studied the strain distribution rule and movement characteristics of strata under reamer-pillar mining, analyzed the stability of the remaining coal pillars in the mining area, and obtained the strain contour graph of strata through calculations. The research result shows that the deformation of coal pillars in a safety-critical state under reamer-pillar mining experiences three stages. The stratum deformation is distributed in the shape of a pyramid with the mining area as the center. On the basis of the strain distribution of strata, the settlement curve and subsidence curve of strata deformation are determined to obtain the rupture angle and angle of draw. After being compared with the measured data, the angle values are almost the same.

Keywords: BOTDA; optical fiber sensing; reamer-pillar mining; shallow coal seam; stratum movement (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
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