Abstract
Advanced knowledge of the permeability characteristics of transparent gels play a key role in providing a rational basis for the study of porous polymer permeability and the research on the migration behavior of superpolymer solutions. Thus, a new type of transparent gel was prepared to simulate porous media, with aim to observe and analyze the permeability characteristics of transparent gel under the conditions of our experimental design by combining a transparent soil test and simple particle image velocimetry. The experimental results showed that the permeability of the transparent gel was similar to that through actual soil. The permeability coefficients of the transparent gel under different pressure gradients varied greatly early in the experimental cycle, while changing only slightly afterward, showing an overall trend of decreasing first and then stabilizing. With the increase of the mass ratio, the permeability coefficient of the sample decreased, the distribution of the low-velocity zone of the intercepted section became wider and tended to move upward. Differences in spatial position also caused different patterns of velocity and direction. The findings presented in this paper contribute to providing a new direction for the study of porous polymer permeability and the porous migration of superpolymer solutions.
Highlights
Test Results and Analysis ity coefficients with time the same mass ratio specimens at different osmotic pressure
The data measured the tests were compiled, and the line graphs of the differences, and the line by graphs of the permeability coefficients with time forpermeabildifferent bysame the tests were compiled, and the line graphs of the permeability ity coefficients with time for the mass ratio specimens at different osmotic mass ratio specimens at the same osmotic pressure differences were plotted
The main conclusions of the article are as follows: The permeability coefficients of specimens with different mass ratios were measured under different pressure differences, and the test results showed that the permeability coefficients of the specimens varied in the range of 10−5 –10−7 cm/s, which was consistent with that of natural soft clay
Summary
Soils are naturally porous media, which have a wide variety of structures due being subject to natural conditions. Natural soils will interchange between unsaturated and saturated states, in which the migration rates and flow paths of water are difficult to predict, and, many scholars have explored and studied them with the help of experimental instruments and theoretical formulas. A rubber membrane was used as a flexible wall in the experimental setup and was mounted on the side of the specimen. This effec-4 of 12 tively avoided sidewall flow during test loading and, reduced the uncertainty of the experimental results.the.
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