Permeability Change in Macro-Fractured Granite Using Water Including Clay
It is important to understand the long-term migration of radionuclides when considering rock engineering projects such as the geological disposal of radioactive waste. The network of fractures and pores in a rock mass plays a major role in fluid migration as it provides a pathway for fluid flow. The...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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The Mining and Materials Processing Institute of Japan
2022-04-01
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| Series: | Journal of MMIJ |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/journalofmmij/138/4/138_44/_pdf/-char/en |
| _version_ | 1797745849562824704 |
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| author | Yoshitaka NARA Masaji KATO Tsutomu SATO Masanori KOHNO Toshinori SATO |
| author_facet | Yoshitaka NARA Masaji KATO Tsutomu SATO Masanori KOHNO Toshinori SATO |
| author_sort | Yoshitaka NARA |
| collection | DOAJ |
| description | It is important to understand the long-term migration of radionuclides when considering rock engineering projects such as the geological disposal of radioactive waste. The network of fractures and pores in a rock mass plays a major role in fluid migration as it provides a pathway for fluid flow. The geometry of a network can change due to fracture sealing by some fine-grained materials over long-term periods. Groundwater usually contains finegrained minerals such as clay minerals, and it is probable that the accumulation of such minerals occurs within a rock fracture upon groundwater flow, thereby decreasing the aperture of a fracture and the permeability. It is therefore essential to conduct permeability measurements using water that includes fine-grained minerals to understand the permeability characteristics of a rock; however, this has not been studied to date. In the present study, we use a macro-fractured granite sample to investigate the change of permeability that occurs under the flow of water that includes two different amounts of clay. Findings showed that clay accumulated in a fracture and that the permeability (hydraulic conductivity) of the granite sample decreased over time, which was greater in for the higher clay content. We concluded that the accumulation of clay minerals in the fracture decreased the permeability of the rock. Furthermore, we consider that the filling and closure of fractures in rock is possible under the flow of groundwater that includes clay minerals. |
| first_indexed | 2024-03-12T15:29:49Z |
| format | Article |
| id | doaj.art-acf76fe56ae747069f1551453976b035 |
| institution | Directory Open Access Journal |
| issn | 1881-6118 1884-0450 |
| language | English |
| last_indexed | 2024-03-12T15:29:49Z |
| publishDate | 2022-04-01 |
| publisher | The Mining and Materials Processing Institute of Japan |
| record_format | Article |
| series | Journal of MMIJ |
| spelling | doaj.art-acf76fe56ae747069f1551453976b0352023-08-10T09:06:15ZengThe Mining and Materials Processing Institute of JapanJournal of MMIJ1881-61181884-04502022-04-011384445010.2473/journalofmmij.138.44journalofmmijPermeability Change in Macro-Fractured Granite Using Water Including ClayYoshitaka NARA0Masaji KATO1Tsutomu SATO2Masanori KOHNO3Toshinori SATO4Department of Civil and Earth Resources Engineering, Graduate School of Engineering, Kyoto UniversityFaculty of Engineering, Hokkaido UniversityFaculty of Engineering, Hokkaido UniversityDepartment of Management of Social Systems and Civil Engineering, Graduate School of Engineering, Tottori UniversityJapan Atomic Energy AgencyIt is important to understand the long-term migration of radionuclides when considering rock engineering projects such as the geological disposal of radioactive waste. The network of fractures and pores in a rock mass plays a major role in fluid migration as it provides a pathway for fluid flow. The geometry of a network can change due to fracture sealing by some fine-grained materials over long-term periods. Groundwater usually contains finegrained minerals such as clay minerals, and it is probable that the accumulation of such minerals occurs within a rock fracture upon groundwater flow, thereby decreasing the aperture of a fracture and the permeability. It is therefore essential to conduct permeability measurements using water that includes fine-grained minerals to understand the permeability characteristics of a rock; however, this has not been studied to date. In the present study, we use a macro-fractured granite sample to investigate the change of permeability that occurs under the flow of water that includes two different amounts of clay. Findings showed that clay accumulated in a fracture and that the permeability (hydraulic conductivity) of the granite sample decreased over time, which was greater in for the higher clay content. We concluded that the accumulation of clay minerals in the fracture decreased the permeability of the rock. Furthermore, we consider that the filling and closure of fractures in rock is possible under the flow of groundwater that includes clay minerals.https://www.jstage.jst.go.jp/article/journalofmmij/138/4/138_44/_pdf/-char/enpermeabilitygranitefractureclay |
| spellingShingle | Yoshitaka NARA Masaji KATO Tsutomu SATO Masanori KOHNO Toshinori SATO Permeability Change in Macro-Fractured Granite Using Water Including Clay Journal of MMIJ permeability granite fracture clay |
| title | Permeability Change in Macro-Fractured Granite Using Water Including Clay |
| title_full | Permeability Change in Macro-Fractured Granite Using Water Including Clay |
| title_fullStr | Permeability Change in Macro-Fractured Granite Using Water Including Clay |
| title_full_unstemmed | Permeability Change in Macro-Fractured Granite Using Water Including Clay |
| title_short | Permeability Change in Macro-Fractured Granite Using Water Including Clay |
| title_sort | permeability change in macro fractured granite using water including clay |
| topic | permeability granite fracture clay |
| url | https://www.jstage.jst.go.jp/article/journalofmmij/138/4/138_44/_pdf/-char/en |
| work_keys_str_mv | AT yoshitakanara permeabilitychangeinmacrofracturedgraniteusingwaterincludingclay AT masajikato permeabilitychangeinmacrofracturedgraniteusingwaterincludingclay AT tsutomusato permeabilitychangeinmacrofracturedgraniteusingwaterincludingclay AT masanorikohno permeabilitychangeinmacrofracturedgraniteusingwaterincludingclay AT toshinorisato permeabilitychangeinmacrofracturedgraniteusingwaterincludingclay |