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• W3210072680 abstract "Size effect on surface roughness is critical in characterizing the permeable property of rock facture. Based on the three-dimensional morphology of the fracture surface scanning in the field, the size effect on the fracture surface roughness and permeability were investigated. First, the morphology of the fracture surface was obtained, including asperity height distribution, surface roughness and anisotropic. It was found that the distributions of asperity height followed the normal distribution and the roughness of the scanning fracture surface is anisotropic. Then, the root-mean-square of the first derivative of asperity Z2 was adopted to represent the fracture surface roughness and the size effect on fracture surface roughness was analysed based on the asperity height data. As fracture size continued to increase, fracture surface roughness tended to move a relatively stable state. The roughness variation coefficient of 15% is taken as the criterion for the roughness to enter a stable state and the critical size for the stability of fracture surface roughness is 300 mm. Finally, the size effect on the fracture permeability was analysed. The size effect on the permeability of rock fracture was investigated, the results show that the fracture permeability tended to move to a relatively stable state with the increase of fracture size, which was the same as the fracture surface roughness. The critical fracture size of fracture permeability is less than 100 mm in the study, which is also less than that of fracture surface roughness with the same coefficient of variation. It indicated that a lower coefficient of variation may provide the best estimate of the critical fracture size of fracture permeability comparing with the fracture surface roughness." @default.
• W3210072680 created "2021-11-08" @default.
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• W3210072680 date "2021-10-01" @default.
• W3210072680 modified "2023-09-24" @default.
• W3210072680 title "Size effect on surface roughness and permeability of rock fracture" @default.
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