In order to study permeability evolution law of shale under cyclic loading and unloading of osmotic pressure, cyclic loading and unloading tests of shale with different confining pressures and different osmotic pressures were conducted by using the improved pulse attenuation gas permeability measurement device. The test results showed that initial confining pressure affects initial permeability of shale, and the larger the initial confining pressure, the smaller the initial permeability; in process of cyclic loading and unloading of osmotic pressure with constant confining pressure, the permeability increases with loading of osmotic pressure and decreases with unloading of osmotic pressure; in the same osmotic pressure loading and unloading cycle, permeability curve in loading stage doesn’t coincide with that in unloading stage, and the latter is above the former; the fitting result of the relation between permeability and cyclic loading and unloading of osmotic pressure is in accordance with quadratic function, and the correlation coefficient is more than 95%.
WANG Junguang, SUN Qinglin, LIANG Bing, YU Qingrong.
Permeability evolution law of shale under cyclic loading and unloading of osmotic pressure[J]. Journal of Vibration and Shock, 2021, 40(7): 253-259
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