Insight on the Swelling Pressure–Suction Relationship of Compacted Bentonite during Hydration
Investigation of the swelling pressure of buffer/backfill materials is a critical aspect in the design of high-level radioactive waste (HLW) disposal repositories. In this study, to clarify the swelling pressure–suction relation for compacted bentonite upon the hydration path, constant-volume swelli...
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| Format: | Article |
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MDPI AG
2023-08-01
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| Series: | Materials |
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| Online Access: | https://www.mdpi.com/1996-1944/16/15/5403 |
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| author | Yang Wang Jun Teng Qi Huang Wei Wang Yong Zhong |
| author_facet | Yang Wang Jun Teng Qi Huang Wei Wang Yong Zhong |
| author_sort | Yang Wang |
| collection | DOAJ |
| description | Investigation of the swelling pressure of buffer/backfill materials is a critical aspect in the design of high-level radioactive waste (HLW) disposal repositories. In this study, to clarify the swelling pressure–suction relation for compacted bentonite upon the hydration path, constant-volume swelling pressure tests with suction control were conducted. The swelling pressure–suction curves indicated that the swelling pressure of the specimens increased significantly with increasing dry density, while the shape of the curves during hydration depended on the dry density. Moreover, the swelling pressure–suction curves exhibited a distinction between unsaturated and saturated segments divided by the critical saturated state (CSS) curve, which proves the unique existence of a CSS curve in the stress space independent of the stress path. With the introduction of the CSS curve into the s–p space, the conventional stress space of unsaturated soil could expand to that of unsaturated expansive soil. The results obtained in this study could provide the mechanical parameters for the construction of disposal repositories. In addition, the stress space with CSS curve proposed in this study provides a new approach to building constitutive models of bentonite materials. |
| first_indexed | 2024-03-11T00:22:36Z |
| format | Article |
| id | doaj.art-8d5a9afc4a164da685d993bbe7d37305 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-11T00:22:36Z |
| publishDate | 2023-08-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Materials |
| spelling | doaj.art-8d5a9afc4a164da685d993bbe7d373052023-11-18T23:12:51ZengMDPI AGMaterials1996-19442023-08-011615540310.3390/ma16155403Insight on the Swelling Pressure–Suction Relationship of Compacted Bentonite during HydrationYang Wang0Jun Teng1Qi Huang2Wei Wang3Yong Zhong4School of Civil and Environmental Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, ChinaSchool of Civil and Environmental Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, ChinaEngineering Management Center, Bureau of Public Works of Shenzhen Municipality, Shenzhen 518031, ChinaEngineering Management Center, Bureau of Public Works of Shenzhen Municipality, Shenzhen 518031, ChinaEngineering Management Center, Bureau of Public Works of Shenzhen Municipality, Shenzhen 518031, ChinaInvestigation of the swelling pressure of buffer/backfill materials is a critical aspect in the design of high-level radioactive waste (HLW) disposal repositories. In this study, to clarify the swelling pressure–suction relation for compacted bentonite upon the hydration path, constant-volume swelling pressure tests with suction control were conducted. The swelling pressure–suction curves indicated that the swelling pressure of the specimens increased significantly with increasing dry density, while the shape of the curves during hydration depended on the dry density. Moreover, the swelling pressure–suction curves exhibited a distinction between unsaturated and saturated segments divided by the critical saturated state (CSS) curve, which proves the unique existence of a CSS curve in the stress space independent of the stress path. With the introduction of the CSS curve into the s–p space, the conventional stress space of unsaturated soil could expand to that of unsaturated expansive soil. The results obtained in this study could provide the mechanical parameters for the construction of disposal repositories. In addition, the stress space with CSS curve proposed in this study provides a new approach to building constitutive models of bentonite materials.https://www.mdpi.com/1996-1944/16/15/5403compacted bentoniteswelling pressure–suction curveCSS curvestress path |
| spellingShingle | Yang Wang Jun Teng Qi Huang Wei Wang Yong Zhong Insight on the Swelling Pressure–Suction Relationship of Compacted Bentonite during Hydration Materials compacted bentonite swelling pressure–suction curve CSS curve stress path |
| title | Insight on the Swelling Pressure–Suction Relationship of Compacted Bentonite during Hydration |
| title_full | Insight on the Swelling Pressure–Suction Relationship of Compacted Bentonite during Hydration |
| title_fullStr | Insight on the Swelling Pressure–Suction Relationship of Compacted Bentonite during Hydration |
| title_full_unstemmed | Insight on the Swelling Pressure–Suction Relationship of Compacted Bentonite during Hydration |
| title_short | Insight on the Swelling Pressure–Suction Relationship of Compacted Bentonite during Hydration |
| title_sort | insight on the swelling pressure suction relationship of compacted bentonite during hydration |
| topic | compacted bentonite swelling pressure–suction curve CSS curve stress path |
| url | https://www.mdpi.com/1996-1944/16/15/5403 |
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