首页|An analytical transient coal permeability model:Sorption non-equilibrium index-based swelling switch

An analytical transient coal permeability model:Sorption non-equilibrium index-based swelling switch

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Long-term permeability experiments have indicated that sorption-induced swelling can switch from internal to bulk depending on the evolutive sorption status.However,this sorption swelling switch mechanism has not been considered in current analytical permeability models.This study introduces a normalized sorption non-equilibrium index(SNEI)to characterize the sorption status,quantify the dynamical variations of matrix swelling accumulation and internal swelling partition,and formulate the sorption swelling switch model.The incorporation of this index into the extended total effective stress concept leads to an analytical transient coal permeability model.Model results show that the sorption swelling switch itself results in the permeability switch under stress-constrained conditions,while the confined bulk swelling suppresses the permeability recovery to the continuous reduction under displacement-constrained conditions.Model verifications show that current experimental observations correspond to the early stages of the transient process,and they could be extended to the whole process with these models.This study demonstrates the importance of the sorption swelling switch in deter-mining permeability evolution using simple boundary conditions.It provides new insights into experi-mentally revealing the sorption swelling switch in the future,and underscores the requirement of a rigorous model for complex coupled processes in large-scale coal seams.

Coal permeabilitySorption swelling switchSorption non-equilibriumBoundary conditions

Xingxing Liu、Jishan Liu、Liang Chen、Jinchang Sheng、Huimin Wang

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College of Civil and Transportation Engineering,Hohai University,Nanjing,210098,China

School of Engineering,The University of Western Australia,35 Stirling Highway,Crawley,WA,6009,Australia

College of Water Conservancy and Hydropower Engineering,Hohai University,Nanjing,210098,China

Australian Research CouncilNational Natural Science Foundation of ChinaZhejiang Collaborative Innovation Center for Prevention and Control of Mountain Geological Hazards

DP20010129342202286PCMGH-2017-Z-02

2024

10.1016/j.jrmge.2023.10.013

岩石力学与岩土工程学报(英文版)
中国科学院武汉岩土力学所中国岩石力学与工程学会武汉大学

岩石力学与岩土工程学报(英文版)

CSTPCD
影响因子：0.404
ISSN：1674-7755
年,卷(期)：2024.16(4)
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