Investigating the effects of effective stress on pore-dependent permeability measurements of crushed coal

The accurate determination of permeability is one of the parameters essential for the study of fluid flow and transport state. However, a large number of fractured coal bodies are faced during the production of coal mines. The study of permeability of these special media composed of grains of a cert...

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Bibliographic Details
Published in:PloS one 2021-12, Vol.16 (12), p.e0261678-e0261678
Main Authors: Pang, Mingkun, Zhang, Tianjun, Gao, Lu, Qin, Binfeng
Format: Article
Language:English
Subjects:
Coal
Coal mines
Coal mining
Coal, Pulverized
Compression
Compression tests
Contrast media
Crushing
Data analysis
Education
Effective stress
Engineering
Engineering and Technology
Exploitation
Fluid dynamics
Fluid flow
Grains
Hydraulics
Laboratories
Mathematical analysis
Measurement
Membrane permeability
Parameters
Particle Size
Permeability
Physical Sciences
Porosity
Porous materials
Porous media
Pressure
Prevention
Stress
Stress, Mechanical
Testing
Textiles
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Summary:The accurate determination of permeability is one of the parameters essential for the study of fluid flow and transport state. However, a large number of fractured coal bodies are faced during the production of coal mines. The study of permeability of these special media composed of grains of a certain size, whose structure is different from that of raw coal, has been in the exploratory stage. In this paper, inspired by the calculation method of median particle size and the calculation principle of KC's equation, we calculate the permeability parameters of broken coal particles. It is considered that its permeability is closely related to the compaction and re-crushing process of skeletal grains. The lateral limit compression test of the crushed coal body was designed, and the pore-dominated permeability calculation method was given to reveal the mechanism of the action of the effective stress. The dependence relationship between the effective stress and the pore-correlation permeability is obtained by data analysis, and the force and deformation process of the crushed coal grain media is described. In contrast to the conventional Darcy series of permeability discussions, our approach excludes the influence of fluid factors on the permeability of porous media. The permeability of porous media is considered to be determined only by its own pore structure.
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0261678