Experimental study on resistivity and electromagnetic radiation of coal under uniaxial compression

Penghong Fan; Baisheng Nie

doi:10.6180/jase.202212_25(6).0004

Experimental study on resistivity and electromagnetic radiation of coal under uniaxial compression

Penghong Fan This email address is being protected from spambots. You need JavaScript enabled to view it.^1,2,3 and Baisheng Nie This email address is being protected from spambots. You need JavaScript enabled to view it.^2,3

¹Department of Mining Engineering, Shanxi Institute of Technology, 045000, Shanxi, China
²School of Emergency Management and Safety Engineering, China University of Mining & Technology (Beijing), 100083, Beijing, China
³State Key Laboratory of Coal Resources and Safe Mining, China University of Mining & Technology (Beijing), 100083, Beijing, China

Received: August 10, 2021
Accepted: December 11, 2021
Publication Date: January 28, 2022

Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.

Download Citation: ||https://doi.org/10.6180/jase.202212_25(6).0004

ABSTRACT

In order to study the response of resistivity and electromagnetic radiation at different stages of deformation and failure of loaded coal, the real-time measurement system of acoustic emission, electrical parameters and electromagnetic radiation of loaded coal was established, the variation characteristics of resistivity and electromagnetic radiation pulse were tested respectively in the vertical bedding direction of different coal under uniaxial loading, and the variation regularity was discussed. The research results indicate that in the initial compaction stage, the electromagnetic radiation pulse increases and the resistivity fluctuates to a certain extent with the closure of coal pores and fissures. In the elastic stage, the EME (Electromagnetic Effects) pulses and change of resistivity decrease greatly and the change curve of resistivity is close to be linear. In the unstable development stage, the EME pulses show the peak value, the resistivity fluctuates obviously and tends to decrease further before the stress peak. Through the comparative analysis of resistivity and electromagnetic radiation pulse, the increasing area of electromagnetic radiation pulse generally appears in the area with the large changes of resistivity.

Keywords: resistivity; electromagnetic radiation; uniaxial compression; coal

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