Numerical Modeling of Water and Gas Transport in Compacted GMZ Bentonite under Constant Volume Condition
During deep geological disposal of high-level and long-lived radioactive waste, underground water erosion into buffer materials, such as bentonite, and gas production around the canister are unavoidable. Therefore, understanding water and gas migration into buffer materials is important when it come...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2021-01-01
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| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2021/4290426 |
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| _version_ | 1849304357515821056 |
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| author | Jiang-Feng Liu Xu-Lou Cao Hong-Yang Ni Kai Zhang Zhi-Xiao Ma Li-Ke Ma Hai Pu |
| author_facet | Jiang-Feng Liu Xu-Lou Cao Hong-Yang Ni Kai Zhang Zhi-Xiao Ma Li-Ke Ma Hai Pu |
| author_sort | Jiang-Feng Liu |
| collection | DOAJ |
| description | During deep geological disposal of high-level and long-lived radioactive waste, underground water erosion into buffer materials, such as bentonite, and gas production around the canister are unavoidable. Therefore, understanding water and gas migration into buffer materials is important when it comes to determining the sealing ability of engineered barriers in deep geological repositories. The main aim of our study is to provide insights into the water/gas transport in a compacted bentonite sample under constant volume conditions. The results of our study indicate that water saturation is obtained after 450 hours, which is similar to experimental results. Gas migration testing shows that the degree of water saturation in the samples is very sensitive to the gas pressure. As soon as 2 MPa or higher gas pressure was applied, the water saturation degree decreased quickly. Laboratory experiments indicate that gas breakthrough occurs at 4 MPa, with water being expelled from the downstream side. This indicates that gas pressure has a significant effect on the sealing ability of Gaomizozi (GMZ) bentonite. |
| format | Article |
| id | doaj-art-111d4a433eb64c1abdae7c98b764ae99 |
| institution | Kabale University |
| issn | 1468-8115 1468-8123 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geofluids |
| spelling | doaj-art-111d4a433eb64c1abdae7c98b764ae992025-08-20T03:55:45ZengWileyGeofluids1468-81151468-81232021-01-01202110.1155/2021/42904264290426Numerical Modeling of Water and Gas Transport in Compacted GMZ Bentonite under Constant Volume ConditionJiang-Feng Liu0Xu-Lou Cao1Hong-Yang Ni2Kai Zhang3Zhi-Xiao Ma4Li-Ke Ma5Hai Pu6State Key Laboratory for Geomechanics and Deep Underground Engineering and School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, ChinaState Key Laboratory for Geomechanics and Deep Underground Engineering and School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, ChinaState Key Laboratory for Geomechanics and Deep Underground Engineering and School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, ChinaState Key Laboratory for Geomechanics and Deep Underground Engineering and School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, ChinaState Key Laboratory for Geomechanics and Deep Underground Engineering and School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, ChinaCNNC Beijing Research Institute of Uranium Geology (BRIUG), Beijing 100029, ChinaState Key Laboratory for Geomechanics and Deep Underground Engineering and School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou 221116, ChinaDuring deep geological disposal of high-level and long-lived radioactive waste, underground water erosion into buffer materials, such as bentonite, and gas production around the canister are unavoidable. Therefore, understanding water and gas migration into buffer materials is important when it comes to determining the sealing ability of engineered barriers in deep geological repositories. The main aim of our study is to provide insights into the water/gas transport in a compacted bentonite sample under constant volume conditions. The results of our study indicate that water saturation is obtained after 450 hours, which is similar to experimental results. Gas migration testing shows that the degree of water saturation in the samples is very sensitive to the gas pressure. As soon as 2 MPa or higher gas pressure was applied, the water saturation degree decreased quickly. Laboratory experiments indicate that gas breakthrough occurs at 4 MPa, with water being expelled from the downstream side. This indicates that gas pressure has a significant effect on the sealing ability of Gaomizozi (GMZ) bentonite.http://dx.doi.org/10.1155/2021/4290426 |
| spellingShingle | Jiang-Feng Liu Xu-Lou Cao Hong-Yang Ni Kai Zhang Zhi-Xiao Ma Li-Ke Ma Hai Pu Numerical Modeling of Water and Gas Transport in Compacted GMZ Bentonite under Constant Volume Condition Geofluids |
| title | Numerical Modeling of Water and Gas Transport in Compacted GMZ Bentonite under Constant Volume Condition |
| title_full | Numerical Modeling of Water and Gas Transport in Compacted GMZ Bentonite under Constant Volume Condition |
| title_fullStr | Numerical Modeling of Water and Gas Transport in Compacted GMZ Bentonite under Constant Volume Condition |
| title_full_unstemmed | Numerical Modeling of Water and Gas Transport in Compacted GMZ Bentonite under Constant Volume Condition |
| title_short | Numerical Modeling of Water and Gas Transport in Compacted GMZ Bentonite under Constant Volume Condition |
| title_sort | numerical modeling of water and gas transport in compacted gmz bentonite under constant volume condition |
| url | http://dx.doi.org/10.1155/2021/4290426 |
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