Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6773805 | Soils and Foundations | 2018 | 15 Pages |
Abstract
Gas migration/breakthrough in saturated bentonite is an important issue for the evolution of the sealing ability of the engineered barrier in deep geological repositories. The main contribution of our study is to provide insights into the water and gas transport properties in a compacted bentonite/sand mixture, which was wrapped by a flexible Viton⢠membrane directly before being put into a triaxial cell. The experimental results indicate that the water permeability is very low and the magnitude is in the order of 10â20â¯m2. Gas breakthrough tests show that no continuous gas flow was detected during the entire gas breakthrough test (until the gas pressure of 10â¯MPa), which indicates that the compacted bentonite/sand mixture has a good sealing ability after full saturation. Another important finding is that the gas migration properties are closely related to the stress state around the sample, the internal pore fluid pressure, and the creep effects caused by the two factors.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Geotechnical Engineering and Engineering Geology
Authors
Jiang-Feng Liu, Shuai-Bing Song, Hong-Yang Ni, Xu-Lou Cao, Hai Pu, Xian-Biao Mao, Frédéric Skoczylas,