Abstract
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.
Highlights
The permeability is a quantity used to quantitatively characterize the ease of fluid passage in porous media [1]
The authors will start from the pore permeability model of the crushed coal medium, calculate the corresponding permeability parameters, and analyze the influence of several factors, such as permeability behavior, evolution history, porosity and effective stress, on the pore-dependent permeability of the coal body
The relationship between deformation and damage of broken coal body is discussed through self-designed lateral limit compression test of broken coal body, and the pore-dependent permeability determination method is given to reveal the core factors affecting the permeability change
Summary
The permeability is a quantity used to quantitatively characterize the ease of fluid passage in porous media [1]. For the Kozeny constant of the crushed coal body medium, Carman has demonstrated through extensive experiments that its calculated value is about 5 [8]. For some phenomena, such as this calculation of permeability due to pore-related structures, it is a difficult problem to determine the permeability of fractured coal bodies accurately. The infiltration channels are further analyzed to give the damage characteristics of such a system composed of broken coal bodies in the crushed coal medium, including the infiltration characteristics of the skeleton and the compaction characteristics of the particles The permeability of this medium composed of coal particles is mainly determined by the pore size, so for the study of the porosity of this medium, it mainly focuses on the determination of the calculation method of permeability.
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