首页|In-situ observation and modeling approach to evolution of pore-fracture structure in coal

In-situ observation and modeling approach to evolution of pore-fracture structure in coal

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The characterisation of the pore-fracture structure(PFS)and its evolution in coal during mining are essential for preventing gas outbursts and improving gas extraction efficiency.In this study,the evolution of the PFS in coal samples under the condition of mining stress was directly captured in situ by combi-nation of the mechanical testing system with high-precision visualisation nuclear magnetic resonance equipment.A fractional derivative model was established to describe the relationship between stress and porosity based on experimental results of the PFS under different stress states.The results showed that with an increase in the deviatoric stress,the adsorption pore content increases rapidly initially and then increases slowly or remains unchanged;the seepage pore and fracture(SPF)content decreases initially and then increases.The SPF compressibility coefficient decreases with an increase in the devia-toric stress.The fractional derivative model can accurately describe the stress sensitivity of the SPFs at the pre-peak stage,thus providing a new approach for accurately characterising the seepage characteristics of coal reservoirs.

Pore-fracture structureFractional derivativeStress sensitivityCompressibilityNuclear magnetic resonance imaging

Hongwei Zhou、Zelin Liu、Jiawei Zhao、Bocen Chen、Xiangnan Li、Jiangcheng Zhong

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School of Energy and Mining Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China

State Key Laboratory of Coal Resources and Safe Mining,China University of Mining and Technology-Beijing,Beijing 100083,China

School of Mechanics and Civil Engineering,China University of Mining and Technology-Beijing,Beijing 100083,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of China111 ProjectYueqi Outstanding Scholar Program of CUMTB

51827901521210035214230251904309B140062017A03

2023

矿业科学技术学报(英文版)
中国矿业大学

矿业科学技术学报(英文版)

CSTPCDCSCD北大核心EI
影响因子：1.222
ISSN：2095-2686
年,卷(期)：2023.33(3)
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