Study on microscopic failure mechanism and numerical simulation of sandstone under different saturated pressure
X-ray diffraction and SEM scanning are conducted to examine the alterations in sandstone under different saturation conditions to reveal the water-rock softening effect on sandstone from the Qilicun tunnels in China under varying saturation pressures. The mechanisms underpinning the strength softeni...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2024-01-01
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| Series: | Unconventional Resources |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666519023000237 |
| _version_ | 1827805311918931968 |
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| author | Xiaohui Wang Zheng Cheng Yaoting Zhou Kai Xu Yifan Liao |
| author_facet | Xiaohui Wang Zheng Cheng Yaoting Zhou Kai Xu Yifan Liao |
| author_sort | Xiaohui Wang |
| collection | DOAJ |
| description | X-ray diffraction and SEM scanning are conducted to examine the alterations in sandstone under different saturation conditions to reveal the water-rock softening effect on sandstone from the Qilicun tunnels in China under varying saturation pressures. The mechanisms underpinning the strength softening of sandstone are analyzed using uniaxial compression tests. The experimental results demonstrated that after immersion in water, the internal cementing material within the sandstone dissolves, and the mineral particles fragment or disintegrate, increasing porosity. In the presence of water, the macroscopic compressive strength of sandstone exhibits a declining trend. Concurrently, as the saturation pressure escalates, the compressive strength diminishes by approximately 10%, the elastic modulus decreases by about 30%, and Poisson's ratio incrementally falls by about 25%. The sandstone's failure is characterized by both axial multiple splitting surface failure and shear failure surface. Finally, a strain-softening numerical model is employed to simulate the failure behaviors of sandstone under various saturation pressures. The findings indicated that the sandstone sample exhibits plastic failure characteristics under high saturation pressure. |
| first_indexed | 2024-03-11T21:23:47Z |
| format | Article |
| id | doaj.art-4d9a740134604aedb219e364a3d58754 |
| institution | Directory Open Access Journal |
| issn | 2666-5190 |
| language | English |
| last_indexed | 2024-03-11T21:23:47Z |
| publishDate | 2024-01-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Unconventional Resources |
| spelling | doaj.art-4d9a740134604aedb219e364a3d587542023-09-28T05:26:33ZengKeAi Communications Co., Ltd.Unconventional Resources2666-51902024-01-014100058Study on microscopic failure mechanism and numerical simulation of sandstone under different saturated pressureXiaohui Wang0Zheng Cheng1Yaoting Zhou2Kai Xu3Yifan Liao4Wuhan Engineering Co, Ltd of China Railway Seventh Group, Wuhan, 430074, ChinaWuhan Engineering Co, Ltd of China Railway Seventh Group, Wuhan, 430074, ChinaWuhan Engineering Co, Ltd of China Railway Seventh Group, Wuhan, 430074, ChinaWuhan Engineering Co, Ltd of China Railway Seventh Group, Wuhan, 430074, ChinaAnhui Key Laboratory of Mining Construction Engineering, Anhui University of Science and Technology, Huainan, Anhui, 23200l, China; Factory of Engineering, China University of Geosciences (Wuhan), 430074, China; Corresponding author. Anhui Key Laboratory of Mining Construction Engineering, Anhui University of Science and Technology, Huainan, Anhui, 23200l, China.X-ray diffraction and SEM scanning are conducted to examine the alterations in sandstone under different saturation conditions to reveal the water-rock softening effect on sandstone from the Qilicun tunnels in China under varying saturation pressures. The mechanisms underpinning the strength softening of sandstone are analyzed using uniaxial compression tests. The experimental results demonstrated that after immersion in water, the internal cementing material within the sandstone dissolves, and the mineral particles fragment or disintegrate, increasing porosity. In the presence of water, the macroscopic compressive strength of sandstone exhibits a declining trend. Concurrently, as the saturation pressure escalates, the compressive strength diminishes by approximately 10%, the elastic modulus decreases by about 30%, and Poisson's ratio incrementally falls by about 25%. The sandstone's failure is characterized by both axial multiple splitting surface failure and shear failure surface. Finally, a strain-softening numerical model is employed to simulate the failure behaviors of sandstone under various saturation pressures. The findings indicated that the sandstone sample exhibits plastic failure characteristics under high saturation pressure.http://www.sciencedirect.com/science/article/pii/S2666519023000237SandstoneMicrostructure observationUniaxial compressive testsStrain softening |
| spellingShingle | Xiaohui Wang Zheng Cheng Yaoting Zhou Kai Xu Yifan Liao Study on microscopic failure mechanism and numerical simulation of sandstone under different saturated pressure Unconventional Resources Sandstone Microstructure observation Uniaxial compressive tests Strain softening |
| title | Study on microscopic failure mechanism and numerical simulation of sandstone under different saturated pressure |
| title_full | Study on microscopic failure mechanism and numerical simulation of sandstone under different saturated pressure |
| title_fullStr | Study on microscopic failure mechanism and numerical simulation of sandstone under different saturated pressure |
| title_full_unstemmed | Study on microscopic failure mechanism and numerical simulation of sandstone under different saturated pressure |
| title_short | Study on microscopic failure mechanism and numerical simulation of sandstone under different saturated pressure |
| title_sort | study on microscopic failure mechanism and numerical simulation of sandstone under different saturated pressure |
| topic | Sandstone Microstructure observation Uniaxial compressive tests Strain softening |
| url | http://www.sciencedirect.com/science/article/pii/S2666519023000237 |
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