Experimental Study on Damage Properties of Granites Under Flowing Acid Solution
In order to study the deterioration characteristics of the tunnel surrounding rock under the scouring of flowing groundwater, we ratioed similar acidic solutions based on groundwater composition. The microstructure of granite samples cored on site, deformation features, and evolution characteristics...
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2022-07-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2022.927159/full |
| _version_ | 1811292593347100672 |
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| author | Wei Chen Wei Chen Wen Wan Yanlin Zhao Qiuhong Wu Huan He Wenqing Peng Xiaofan Wu Yu Zhou Li Wu Senlin Xie |
| author_facet | Wei Chen Wei Chen Wen Wan Yanlin Zhao Qiuhong Wu Huan He Wenqing Peng Xiaofan Wu Yu Zhou Li Wu Senlin Xie |
| author_sort | Wei Chen |
| collection | DOAJ |
| description | In order to study the deterioration characteristics of the tunnel surrounding rock under the scouring of flowing groundwater, we ratioed similar acidic solutions based on groundwater composition. The microstructure of granite samples cored on site, deformation features, and evolution characteristics of mechanical parameters under saturations with different flow rates and various pH values were analyzed using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), nuclear magnetic resonance (NMR), and X-ray diffraction (XRD). The results indicate the following: 1) compared with the static water condition, the higher flow rate produces greater relative changes in granite’s microstructure, porosity, mass, and pH of the immersed solution. Moreover, the rate of change is relatively fast in the early stage and gradually slows down until it reaches a stable state. 2) Compared with the natural dry condition, the solution with a lower pH value causes the structural framework of the specimen to loosen, the mass loss degree to increase, and the porosity dispersion to intensify. 3) The dynamic water is more sensitive than the static water to the elastic vertical wave velocity of granite. Compared with the dry sample, the elastic longitudinal wave velocity of the sample in acidic solution with pH = 2 and flow rates of 0, 150, and 300 mm·s−1 for 49 days decreased by 8.7, 10.9, and 13.5%, respectively, which accelerates the instability and failure of the granite surroundings. |
| first_indexed | 2024-04-13T04:48:35Z |
| format | Article |
| id | doaj.art-3fff36bf29e747b9a6e92ac389a4e8bc |
| institution | Directory Open Access Journal |
| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-04-13T04:48:35Z |
| publishDate | 2022-07-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj.art-3fff36bf29e747b9a6e92ac389a4e8bc2022-12-22T03:01:46ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632022-07-011010.3389/feart.2022.927159927159Experimental Study on Damage Properties of Granites Under Flowing Acid SolutionWei Chen0Wei Chen1Wen Wan2Yanlin Zhao3Qiuhong Wu4Huan He5Wenqing Peng6Xiaofan Wu7Yu Zhou8Li Wu9Senlin Xie10Department of Building Engineering, Hunan Institute of Engineering, Xiangtan, ChinaSchool of Resource, Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan, ChinaSchool of Resource, Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan, ChinaSchool of Resource, Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan, ChinaSchool of Resource, Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan, ChinaMianyang Economic-Technological Development Zone, Sichuan University of Culture and Arts, Mianyang, ChinaSchool of Resource, Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan, ChinaSchool of Mathematics and Computational Science, Hunan University of Science and Technology, Xiangtan, ChinaSchool of Resource, Environment and Safety Engineering, Hunan University of Science and Technology, Xiangtan, ChinaSchool of Earth Sciences and Spatial Information Engineering, Hunan University of Science and Technology, Xiangtan, ChinaSchool of Energy and Mining Engineering, China University of Mining and Technology (Beijing), Beijing, ChinaIn order to study the deterioration characteristics of the tunnel surrounding rock under the scouring of flowing groundwater, we ratioed similar acidic solutions based on groundwater composition. The microstructure of granite samples cored on site, deformation features, and evolution characteristics of mechanical parameters under saturations with different flow rates and various pH values were analyzed using scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), nuclear magnetic resonance (NMR), and X-ray diffraction (XRD). The results indicate the following: 1) compared with the static water condition, the higher flow rate produces greater relative changes in granite’s microstructure, porosity, mass, and pH of the immersed solution. Moreover, the rate of change is relatively fast in the early stage and gradually slows down until it reaches a stable state. 2) Compared with the natural dry condition, the solution with a lower pH value causes the structural framework of the specimen to loosen, the mass loss degree to increase, and the porosity dispersion to intensify. 3) The dynamic water is more sensitive than the static water to the elastic vertical wave velocity of granite. Compared with the dry sample, the elastic longitudinal wave velocity of the sample in acidic solution with pH = 2 and flow rates of 0, 150, and 300 mm·s−1 for 49 days decreased by 8.7, 10.9, and 13.5%, respectively, which accelerates the instability and failure of the granite surroundings.https://www.frontiersin.org/articles/10.3389/feart.2022.927159/fullgranite surroundingsrock mechanics parameterseffect of solution velocityhydration corrosiondamage mechanism |
| spellingShingle | Wei Chen Wei Chen Wen Wan Yanlin Zhao Qiuhong Wu Huan He Wenqing Peng Xiaofan Wu Yu Zhou Li Wu Senlin Xie Experimental Study on Damage Properties of Granites Under Flowing Acid Solution Frontiers in Earth Science granite surroundings rock mechanics parameters effect of solution velocity hydration corrosion damage mechanism |
| title | Experimental Study on Damage Properties of Granites Under Flowing Acid Solution |
| title_full | Experimental Study on Damage Properties of Granites Under Flowing Acid Solution |
| title_fullStr | Experimental Study on Damage Properties of Granites Under Flowing Acid Solution |
| title_full_unstemmed | Experimental Study on Damage Properties of Granites Under Flowing Acid Solution |
| title_short | Experimental Study on Damage Properties of Granites Under Flowing Acid Solution |
| title_sort | experimental study on damage properties of granites under flowing acid solution |
| topic | granite surroundings rock mechanics parameters effect of solution velocity hydration corrosion damage mechanism |
| url | https://www.frontiersin.org/articles/10.3389/feart.2022.927159/full |
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