Comprehensive investigation into the effects of oxygen concentration on pyrite oxidation processes and key ion migration patterns in black rock layers
This study systematically analyzed the impact of oxygen concentration on the oxidation of black rock layer samples and the migration patterns of key ions, focusing on samples from a high-speed railway subgrade in Fenghuang County, Hunan Province. The experimental results identified three stages of s...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-07-01
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| Series: | Case Studies in Construction Materials |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214509525000257 |
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| author | Zihang Liu Zhangjun Dai Fei Yu Kaiwen Tong Jianhua Guo Kang Huang Shanglin Qin Shanxiong Chen |
| author_facet | Zihang Liu Zhangjun Dai Fei Yu Kaiwen Tong Jianhua Guo Kang Huang Shanglin Qin Shanxiong Chen |
| author_sort | Zihang Liu |
| collection | DOAJ |
| description | This study systematically analyzed the impact of oxygen concentration on the oxidation of black rock layer samples and the migration patterns of key ions, focusing on samples from a high-speed railway subgrade in Fenghuang County, Hunan Province. The experimental results identified three stages of sample oxidation, showing that oxygen concentration significantly influences the reaction rate during the initial stage. Under high oxygen concentration, the generation rate of sulfate ions (SO42−) rapidly peaks in the early phase. Although this initial phase only accounts for 8 % of the entire oxidation process, it constitutes 77 % of the overall reaction. After this peak, the rate gradually decreases and stabilizes. While the oxidation rate is slower under medium and low oxygen concentrations, the overall trend remains similar to that observed under high oxygen conditions. The study also revealed that fill material samples are particularly sensitive to oxygen concentration during the early stages of oxidation, whereas the oxidation process in parent rock samples is significantly delayed due to their long-term undisturbed state and lower pyrite content. Additionally, water plays a crucial role as a reaction medium in the oxidation process, with its infiltration rate directly affecting the initial oxidation rate. These findings provide important insights for preventing geological hazards in high-speed rail projects under similar geological conditions. |
| format | Article |
| id | doaj-art-b51a51fb93494ad5b171ddd8185a1a3b |
| institution | Kabale University |
| issn | 2214-5095 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Case Studies in Construction Materials |
| spelling | doaj-art-b51a51fb93494ad5b171ddd8185a1a3b2025-01-09T06:14:01ZengElsevierCase Studies in Construction Materials2214-50952025-07-0122e04226Comprehensive investigation into the effects of oxygen concentration on pyrite oxidation processes and key ion migration patterns in black rock layersZihang Liu0Zhangjun Dai1Fei Yu2Kaiwen Tong3Jianhua Guo4Kang Huang5Shanglin Qin6Shanxiong Chen7State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; University of Chinese Academy of Sciences, Beijing 100049, ChinaState Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; Corresponding author.State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, ChinaState Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; University of Chinese Academy of Sciences, Beijing 100049, ChinaState Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; Changjiang Institute of Survey, Planning, Design & Research Corporation, Wuhan 430010, ChinaState Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; Key Laboratory of Geotechnical Mechanics and Engineering of the Ministry of Water Resources, Changjiang River Scientific Research Institute, Wuhan 430010, ChinaState Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, ChinaState Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, ChinaThis study systematically analyzed the impact of oxygen concentration on the oxidation of black rock layer samples and the migration patterns of key ions, focusing on samples from a high-speed railway subgrade in Fenghuang County, Hunan Province. The experimental results identified three stages of sample oxidation, showing that oxygen concentration significantly influences the reaction rate during the initial stage. Under high oxygen concentration, the generation rate of sulfate ions (SO42−) rapidly peaks in the early phase. Although this initial phase only accounts for 8 % of the entire oxidation process, it constitutes 77 % of the overall reaction. After this peak, the rate gradually decreases and stabilizes. While the oxidation rate is slower under medium and low oxygen concentrations, the overall trend remains similar to that observed under high oxygen conditions. The study also revealed that fill material samples are particularly sensitive to oxygen concentration during the early stages of oxidation, whereas the oxidation process in parent rock samples is significantly delayed due to their long-term undisturbed state and lower pyrite content. Additionally, water plays a crucial role as a reaction medium in the oxidation process, with its infiltration rate directly affecting the initial oxidation rate. These findings provide important insights for preventing geological hazards in high-speed rail projects under similar geological conditions.http://www.sciencedirect.com/science/article/pii/S2214509525000257Black rock layersPyrite oxidationHigh-speed railSO42− concentrationSubgrade |
| spellingShingle | Zihang Liu Zhangjun Dai Fei Yu Kaiwen Tong Jianhua Guo Kang Huang Shanglin Qin Shanxiong Chen Comprehensive investigation into the effects of oxygen concentration on pyrite oxidation processes and key ion migration patterns in black rock layers Case Studies in Construction Materials Black rock layers Pyrite oxidation High-speed rail SO42− concentration Subgrade |
| title | Comprehensive investigation into the effects of oxygen concentration on pyrite oxidation processes and key ion migration patterns in black rock layers |
| title_full | Comprehensive investigation into the effects of oxygen concentration on pyrite oxidation processes and key ion migration patterns in black rock layers |
| title_fullStr | Comprehensive investigation into the effects of oxygen concentration on pyrite oxidation processes and key ion migration patterns in black rock layers |
| title_full_unstemmed | Comprehensive investigation into the effects of oxygen concentration on pyrite oxidation processes and key ion migration patterns in black rock layers |
| title_short | Comprehensive investigation into the effects of oxygen concentration on pyrite oxidation processes and key ion migration patterns in black rock layers |
| title_sort | comprehensive investigation into the effects of oxygen concentration on pyrite oxidation processes and key ion migration patterns in black rock layers |
| topic | Black rock layers Pyrite oxidation High-speed rail SO42− concentration Subgrade |
| url | http://www.sciencedirect.com/science/article/pii/S2214509525000257 |
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