Experimental study on the frequency dispersion response of composite electrical properties of coal

MENG Hui; LI Jian; LEI Dongji; WANG Yajuan

doi:10.3969/j.issn.1001-1986.2020.04.031

Volume 48 Issue 4

Aug. 2020

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COAL GEOLOGY & EXPLORATION > 2020 > 48(4): 226-232. > DOI: 10.3969/j.issn.1001-1986.2020.04.031

MENG Hui, LI Jian, LEI Dongji, WANG Yajuan. Experimental study on the frequency dispersion response of composite electrical properties of coal[J]. COAL GEOLOGY & EXPLORATION, 2020, 48(4): 226-232. DOI: 10.3969/j.issn.1001-1986.2020.04.031

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Experimental study on the frequency dispersion response of composite electrical properties of coal

MENG Hui¹,
LI Jian^1,2,
LEI Dongji^1,2, ,,
WANG Yajuan^1,2

1. College of Computer Science and Technology, Henan Polytechnic University, Jiaozuo 454003, China;
2. Collaborative Innovation Center of Central Plains Economic Region for Coalbed/Shale Gas, Henan Province, Jiaozuo 454003, China

Funds:

Youth Program of National Natural Science Foundation of China(51704101)

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Received Date: February 29, 2020
Revised Date: May 19, 2020
Published Date: August 24, 2020

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Abstract

Abstract

In order to study the characteristics of frequency dispersion response of the composite electrical properties of coal, the real part R and imaginary part X of the composite resistance of coal body at different direction in different measured areas were measured, the frequency dispersion characteristics were analyzed, different classical models were used to conduct data inversion and comparison. The results show that the composite electrical property parameters(absolute value of R and X) of coal are inversely proportional to the measured area, the characteristic frequency points are not offset, the X-frequency divergence decreases with the increase of measurement area; for the same measured area, the frequency dispersion response of the composite electrical property of coal at different direction is different, the frequency dispersion of the composite electrical curve deviates, the frequency dispersion of X parallel to coal bedding is greater than that vertical to bedding; Debye model and Cole-Cole model can be used to fit the dispersion curve of the composite electrical property of coal, but the former model has simple parameters and clear physical meaning, and coincides well the composite electrical frequency dispersion curve of coal. This study provides an experimental basis for monitoring the seam crack and evaluating coal seam permeability by the evaluation method of the composite electrical property.
- composite resistance,
- measurement area,
- measurement direction,
- composite resistance model

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References

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