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• W2801474907 abstract "The triaxial compression test of crystalline sandstone under different loading and unloading velocity of confining pressure is carried out by using the self-made “THM coupled with servo-controlled seepage apparatus for containing-gas coal”, analyzed the strength, deformation and permeability characteristics of the sample, the results show that: with the increase of confining pressures loading-unloading velocity, Mohr’s stress circle center of the specimen shift to the right, and the ultimate intensity, peak strain and residual stress of the specimens increase gradually. With the decrease of unloading velocity of confining pressure, the axial strain, the radial strain and the volumetric strain of the sample decrease first and then increases, but the radial strain decreases more greatly. The loading and unloading of confining pressure has greater influence on axial strain of specimens. The deformation modulus decreases rapidly with the increase of axial strain and the Poisson’s ratio decreases gradually at the initial stage of loading. When the confining pressure is loaded, the deformation modulus decrease gradually, and the Poisson's ratio increases gradually. When the confining pressure is unloaded, the deformation modulus increase gradually, and the Poisson’s ratio decreases gradually. When the specimen reaches the ultimate intensity, the deformation modulus decreases rapidly, while the Poisson’s ratio increases rapidly. The fitting curve of the confining pressure and the deformation modulus and the Poisson’s ratio in accordance with the distribution of quadratic polynomial function in the loading-unloading confining pressure. There is a corresponding relationship between the evolution of rock permeability and damage deformation during the process of loading and unloading. In the late stage of yielding, the permeability increases slowly, and the permeability increases sharply after the rock sample is destroyed. Fitting the permeability and confining pressure conform to the variation law of the exponential function." @default.
• W2801474907 created "2018-05-17" @default.
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• W2801474907 date "2018-06-01" @default.
• W2801474907 modified "2023-10-14" @default.
• W2801474907 title "Influence of loading and unloading velocity of confining pressure on strength and permeability characteristics of crystalline sandstone" @default.
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• W2801474907 doi "https://doi.org/10.1016/j.rinp.2018.04.043" @default.
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