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Moisture penetration and distribution characterization of hard coal:Aμ-CT study

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Moisture content of rock/coal can change its mechanical properties and absorption capacities,which can directly affect gas diffusivity,change the stress distribution and hence cause significant impacts on the overall gas or coal extraction process.Observation of the water penetration process and water distribution in the coal matrix will be beneficial for the understanding of the fluid-solid coupling mechanism in hydraulic fracturing,aquifer cracking and coal seam infusion.However,the observation of water penetration process and the determination of water distribution mode were hard to be non-destructively achieved as coal is a non-uniform,inhomogeneous and un-transparent material.μ-CT imaging,which is based on variation of X-ray attenuation related to the density and atomic composition of the scanned objects,enables a four-dimensional(spatial-temporal)visualise of the heterogeneous and anisotropic coal samples.The primary aim of this paper is extending the application of μ-CT imaging to explore the moisture penetration and distribution within coal sam-ples during water infusion process,which has been reported by very little literature.The working principle and procedures of CT imaging was firstly introduced.Then,the determination equation of moisture distribution based on density profile was established.The CT determined moisture content has been compared with weighting method for verification.The paper has demonstrated that μ-CT can be used for non-destructively imaging the moisture distribution within coal samples.

CoalMoisture distributionμ-CTWater saturation

Lihai Tan、Ting Ren、Linming Dou、Jian Sun、Xiaohan Yang、Ming Qiao

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School of Resource Environment and Safety Engineering,University of South China,Hengyang 412001,PR China

School of Civil,Mining and Environmental Engineering,University of Wollongong,Sydney,NSW 2522,Australia

State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology,Jiangsu 221116,PR China

School of Energy and Safety Engineering,Anhui University of Science and Technology,Anhui 232001,PR China

School of Civil Engineering,The University of Queensland,Brisbane,QLD 4072,Australia

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2024

10.1007/s40789-024-00713-w

国际煤炭科学技术学报(英文)

国际煤炭科学技术学报(英文)

CSTPCD
ISSN：2095-8293
年,卷(期)：2024.11(4)