Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6386473 | Journal of Contaminant Hydrology | 2014 | 18 Pages |
Abstract
We show that gas pressure Pg does not affect significantly Pswell until a threshold Pg > 2 MPa. When swelling occurs inside a tube with a smooth (turned) inner surface, continuous GB occurs when Pg is equivalent to the effective Pswell (obtained without gas pressure, at 7.32 MPa ± 0.11). When the plug swells inside a grooved tube, continuous GB does not occur up to Pg â¥Â 10.5 MPa: smooth interfaces are a preferential gas migration pathway rather than grooved interfaces, and rather than water-saturated bentonite-sand plugs. With smooth tubes, in presence of Pg â¥Â 2 MPa, although Pswell is not affected, gas passes through the sample at significantly lower values than Pswell, due to partial sample saturation. It is concluded that GB pressure is a more accurate indicator of partial sample saturation than swelling pressure Pswell alone.
Keywords
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Earth-Surface Processes
Authors
J.F. Liu, C.A. Davy, J. Talandier, F. Skoczylas,