Multi-physics numerical analyses for predicting the alterations in permeability and reactive transport behavior within single rock fractures depending on temperature, stress, and fluid pH conditions
The aim of the current study was to establish a validated numerical model for addressing the changes in permeability and reactive transport behavior within rock fractures based on the fluid pH under coupled thermal-hydraulic-mechanical-chemical (THMC) conditions. Firstly, a multi-physics reactive tr...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2022-12-01
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| Series: | Soils and Foundations |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0038080622001159 |
| _version_ | 1828106458903871488 |
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| author | Sho Ogata Eita Nishira Hideaki Yasuhara Naoki Kinoshita Toru Inui Kiyoshi Kishida |
| author_facet | Sho Ogata Eita Nishira Hideaki Yasuhara Naoki Kinoshita Toru Inui Kiyoshi Kishida |
| author_sort | Sho Ogata |
| collection | DOAJ |
| description | The aim of the current study was to establish a validated numerical model for addressing the changes in permeability and reactive transport behavior within rock fractures based on the fluid pH under coupled thermal-hydraulic-mechanical-chemical (THMC) conditions. Firstly, a multi-physics reactive transport model was proposed, considering the geochemical reactions that depend on the temperature, stress, and fluid chemistry conditions (e.g., fluid pH and solute concentrations), as well as the changes in permeability in the rock fractures driven by these reactions, after which the correctness of the model implementation was verified by solving the 1D reactive transport problem as a fundamental benchmark. Secondly, the validity of the model against actual rock fractures was investigated by utilizing the model to replicate the measurements of the evolving permeability and the effluent element concentrations in single granite fractures obtained by means of two flow-through experiments using deionized water (pH ∼ 6) and a NaOH aqueous solution (pH ∼ 11) as permeants under stressed, temperature-elevated conditions. The model predictions efficiently followed the changes in fracture permeability over time measured by both experiments. Additionally, the observed difference in the changing rates, which may contribute to the difference in the fluid pH between the two experiments, was also captured exactly by the predictions. Moreover, in terms of the effluent element concentrations, among all the elements targeted for measurement, the concentrations of most elements were replicated by the model within one order of discrepancy. Overall, it can be concluded that the developed model should be valid for estimating the changes in permeability and reactive transport behavior within rock fractures induced by geochemical reactions which depend on the fluid pH under coupled THMC conditions. |
| first_indexed | 2024-04-11T10:18:11Z |
| format | Article |
| id | doaj.art-5cfa99e10d4449698d39ad15f77de7ee |
| institution | Directory Open Access Journal |
| issn | 2524-1788 |
| language | English |
| last_indexed | 2024-04-11T10:18:11Z |
| publishDate | 2022-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Soils and Foundations |
| spelling | doaj.art-5cfa99e10d4449698d39ad15f77de7ee2022-12-22T04:29:53ZengElsevierSoils and Foundations2524-17882022-12-01626101207Multi-physics numerical analyses for predicting the alterations in permeability and reactive transport behavior within single rock fractures depending on temperature, stress, and fluid pH conditionsSho Ogata0Eita Nishira1Hideaki Yasuhara2Naoki Kinoshita3Toru Inui4Kiyoshi Kishida5Osaka University, Suita 565-0871, Japan; Corresponding author.Osaka University, Suita 565-0871, JapanEhime University, Matsuyama 790-8577, JapanEhime University, Matsuyama 790-8577, JapanOsaka University, Suita 565-0871, JapanKyoto University, Kyoto 615-8530, JapanThe aim of the current study was to establish a validated numerical model for addressing the changes in permeability and reactive transport behavior within rock fractures based on the fluid pH under coupled thermal-hydraulic-mechanical-chemical (THMC) conditions. Firstly, a multi-physics reactive transport model was proposed, considering the geochemical reactions that depend on the temperature, stress, and fluid chemistry conditions (e.g., fluid pH and solute concentrations), as well as the changes in permeability in the rock fractures driven by these reactions, after which the correctness of the model implementation was verified by solving the 1D reactive transport problem as a fundamental benchmark. Secondly, the validity of the model against actual rock fractures was investigated by utilizing the model to replicate the measurements of the evolving permeability and the effluent element concentrations in single granite fractures obtained by means of two flow-through experiments using deionized water (pH ∼ 6) and a NaOH aqueous solution (pH ∼ 11) as permeants under stressed, temperature-elevated conditions. The model predictions efficiently followed the changes in fracture permeability over time measured by both experiments. Additionally, the observed difference in the changing rates, which may contribute to the difference in the fluid pH between the two experiments, was also captured exactly by the predictions. Moreover, in terms of the effluent element concentrations, among all the elements targeted for measurement, the concentrations of most elements were replicated by the model within one order of discrepancy. Overall, it can be concluded that the developed model should be valid for estimating the changes in permeability and reactive transport behavior within rock fractures induced by geochemical reactions which depend on the fluid pH under coupled THMC conditions.http://www.sciencedirect.com/science/article/pii/S0038080622001159Reactive transport modelRock fractureFracture permeabilityGeochemical reactionsPressure dissolutionFluid pH |
| spellingShingle | Sho Ogata Eita Nishira Hideaki Yasuhara Naoki Kinoshita Toru Inui Kiyoshi Kishida Multi-physics numerical analyses for predicting the alterations in permeability and reactive transport behavior within single rock fractures depending on temperature, stress, and fluid pH conditions Soils and Foundations Reactive transport model Rock fracture Fracture permeability Geochemical reactions Pressure dissolution Fluid pH |
| title | Multi-physics numerical analyses for predicting the alterations in permeability and reactive transport behavior within single rock fractures depending on temperature, stress, and fluid pH conditions |
| title_full | Multi-physics numerical analyses for predicting the alterations in permeability and reactive transport behavior within single rock fractures depending on temperature, stress, and fluid pH conditions |
| title_fullStr | Multi-physics numerical analyses for predicting the alterations in permeability and reactive transport behavior within single rock fractures depending on temperature, stress, and fluid pH conditions |
| title_full_unstemmed | Multi-physics numerical analyses for predicting the alterations in permeability and reactive transport behavior within single rock fractures depending on temperature, stress, and fluid pH conditions |
| title_short | Multi-physics numerical analyses for predicting the alterations in permeability and reactive transport behavior within single rock fractures depending on temperature, stress, and fluid pH conditions |
| title_sort | multi physics numerical analyses for predicting the alterations in permeability and reactive transport behavior within single rock fractures depending on temperature stress and fluid ph conditions |
| topic | Reactive transport model Rock fracture Fracture permeability Geochemical reactions Pressure dissolution Fluid pH |
| url | http://www.sciencedirect.com/science/article/pii/S0038080622001159 |
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