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• W2913051009 endingPage "181438" @default.
• W2913051009 startingPage "181438" @default.
• W2913051009 abstract "In situ stress is generally an anisotropic/true triaxial stress ( σ 1 > σ 2 > σ 3 ). Bedding weakens the continuity and integrity of coal. It is critical to understand the mechanical behaviour and gas migration of coal under true triaxial stress conditions. We performed experiments of cubic coal samples to investigate the permeability evolution and mechanical behaviour of coal under true triaxial stress conditions by using newly developed true triaxial geophysical apparatus. We analysed the effect of principal stresses on deformation and permeability characteristics of coal containing bedding planes. The results show that volumetric strain, stress states and bedding directions determine the permeability comprehensively. The variable quantity of strain was the largest in the direction normal to the bedding plane. The expansion or compression degree was characterized by the difference between the major and minor principal strain ( ɛ 1 − ɛ 3 ). Essentially, this represents the difficulty degree with regard to coal being compressed at the initial stress state and the deformation degree in ɛ 1 and ɛ 3 direction. The variation of ( ɛ 1 − ɛ 3 ) was consistent with that of permeability. Under an identical true triaxial stress condition, permeability was smaller when larger stress was applied in the direction normal to the bedding plane. Additionally, stress level in the direction parallel to the bedding planes and the directions between stresses in the direction parallel to the bedding planes and the flow direction also affect the permeability and strain. By solving lateral expansion coefficient, coal also exhibited anisotropic properties." @default.
• W2913051009 created "2019-02-21" @default.
• W2913051009 creator A5027647728 @default.
• W2913051009 creator A5031794241 @default.
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• W2913051009 creator A5053217343 @default.
• W2913051009 date "2019-02-01" @default.
• W2913051009 modified "2023-09-24" @default.
• W2913051009 title "Influence of principal stress effect on deformation and permeability of coal containing beddings under true triaxial stress conditions" @default.
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• W2913051009 doi "https://doi.org/10.1098/rsos.181438" @default.
• W2913051009 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6408416" @default.
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• W2913051009 hasPublicationYear "2019" @default.
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