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Minerals 2019, 9(1), 55; https://doi.org/10.3390/min9010055

Experimental Investigation of Perceptual Characteristics of Functional Cemented Backfilling Materials in Coal Mines

1
State Key Laboratory of Coal Resources and Safe Mining, China University of Mining & Technology, Xuzhou 221116, China
2
State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining & Technology, Xuzhou 221116, China
3
Professional and Technical Service Center of Inner Mongolia Coal Industry, Hohhot 010020, China
*
Author to whom correspondence should be addressed.
Received: 27 November 2018 / Revised: 2 January 2019 / Accepted: 3 January 2019 / Published: 17 January 2019
(This article belongs to the Special Issue Backfilling Materials for Underground Mining)
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Abstract

For investigating perceptual stress characteristics of Functional Cemented Backfilling Materials (FCBM) in coal mines, we prepared functional specimens based on Cemented Backfilling Materials (CBM) with the perceptual stress ability, and clarified their conductive mechanism, perceptual mechanism, and possible engineering applications. Using mechanical tests and the network parallel dynamic method, the mechanical and electrical properties of the prepared materials and the perceptual characteristics under mechanical–electric coupling conditions were analyzed in depth. The test results demonstrate that the deformation of FCBMs obey standard stress–strain rules, while the conductive phase addition can deteriorate their mechanical properties and simultaneously enhance the electrical conductivity of materials. Through fitting, the percolation threshold was determined to be 9.85%. Before the failure, the spatial distribution of the apparent resistivity in the materials was shown to follow the X-shaped radial pattern; after the failure, the material apparent resistivity obeys different distribution rules at various stages. The apparent resistivity of FCBM is negatively correlated with the strain value at the elastic and plastic stages and positively correlated with it at the failure stage. When the graphite content exceeds the percolation threshold, the materials exhibit a favorable perceptual functionality at the elastic stage. View Full-Text
Keywords: functional backfilling; cementing backfilling; network parallel electrical method; mechanical-electrical response functional backfilling; cementing backfilling; network parallel electrical method; mechanical-electrical response
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Liu, H.; Zhang, J.; Zhang, W.; Gao, F.; Yan, H.; An, T. Experimental Investigation of Perceptual Characteristics of Functional Cemented Backfilling Materials in Coal Mines. Minerals 2019, 9, 55.

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