Failure transition of shear-to-dilation band of rock salt under triaxial stresses
Great potential of underground gas/energy storage in salt caverns seems to be a promising solution to support renewable energy. In the underground storage method, the operating cycle unfortunately may reach up to daily or even hourly, which generates complicated pressures on the salt cavern. Further...
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| Format: | Article |
| Language: | English |
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Elsevier
2024-01-01
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| Series: | Journal of Rock Mechanics and Geotechnical Engineering |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674775523001208 |
| _version_ | 1827378827376984064 |
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| author | Jianfeng Liu Xiaosong Qiu Jianxiong Yang Chao Liang Jingjing Dai Yu Bian |
| author_facet | Jianfeng Liu Xiaosong Qiu Jianxiong Yang Chao Liang Jingjing Dai Yu Bian |
| author_sort | Jianfeng Liu |
| collection | DOAJ |
| description | Great potential of underground gas/energy storage in salt caverns seems to be a promising solution to support renewable energy. In the underground storage method, the operating cycle unfortunately may reach up to daily or even hourly, which generates complicated pressures on the salt cavern. Furthermore, the mechanical behavior of rock salt may change and present distinct failure characteristics under different stress states, which affects the performance of salt cavern during the time period of full service. To reproduce a similar loading condition on the cavern surrounding rock mass, the cyclic triaxial loading/unloading tests are performed on the rock salt to explore the mechanical transition behavior and failure characteristics under different confinement. Experimental results show that the rock salt samples present a diffused shear failure band with significant bulges at certain locations in low confining pressure conditions (e.g. 5 MPa, 10 MPa and 15 MPa), which is closely related to crystal misorientation and grain boundary sliding. Under the elevated confinement (e.g. 20 MPa, 30 MPa and 40 MPa), the dilation band dominates the failure mechanism, where the large-size halite crystals are crushed to be smaller size and new pores are developing. The failure transition mechanism revealed in the paper provides additional insight into the mechanical performance of salt caverns influenced by complicated stress states. |
| first_indexed | 2024-03-08T13:02:30Z |
| format | Article |
| id | doaj.art-b6ae731f400542c4891dc73e578dcd12 |
| institution | Directory Open Access Journal |
| issn | 1674-7755 |
| language | English |
| last_indexed | 2024-03-08T13:02:30Z |
| publishDate | 2024-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Rock Mechanics and Geotechnical Engineering |
| spelling | doaj.art-b6ae731f400542c4891dc73e578dcd122024-01-19T04:55:14ZengElsevierJournal of Rock Mechanics and Geotechnical Engineering1674-77552024-01-011615664Failure transition of shear-to-dilation band of rock salt under triaxial stressesJianfeng Liu0Xiaosong Qiu1Jianxiong Yang2Chao Liang3Jingjing Dai4Yu Bian5State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610065, China; CNPC Key Laboratory of Oil and Gas Underground Storage Engineering, Langfang, 065007, China; College of Water Resource and Hydropower, Sichuan University, Chengdu, 610065, ChinaCNPC Key Laboratory of Oil and Gas Underground Storage Engineering, Langfang, 065007, ChinaState Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610065, China; College of Water Resource and Hydropower, Sichuan University, Chengdu, 610065, China; Corresponding author. State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610065, China.State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610065, China; College of Water Resource and Hydropower, Sichuan University, Chengdu, 610065, ChinaState Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610065, China; College of Water Resource and Hydropower, Sichuan University, Chengdu, 610065, ChinaState Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610065, China; College of Water Resource and Hydropower, Sichuan University, Chengdu, 610065, ChinaGreat potential of underground gas/energy storage in salt caverns seems to be a promising solution to support renewable energy. In the underground storage method, the operating cycle unfortunately may reach up to daily or even hourly, which generates complicated pressures on the salt cavern. Furthermore, the mechanical behavior of rock salt may change and present distinct failure characteristics under different stress states, which affects the performance of salt cavern during the time period of full service. To reproduce a similar loading condition on the cavern surrounding rock mass, the cyclic triaxial loading/unloading tests are performed on the rock salt to explore the mechanical transition behavior and failure characteristics under different confinement. Experimental results show that the rock salt samples present a diffused shear failure band with significant bulges at certain locations in low confining pressure conditions (e.g. 5 MPa, 10 MPa and 15 MPa), which is closely related to crystal misorientation and grain boundary sliding. Under the elevated confinement (e.g. 20 MPa, 30 MPa and 40 MPa), the dilation band dominates the failure mechanism, where the large-size halite crystals are crushed to be smaller size and new pores are developing. The failure transition mechanism revealed in the paper provides additional insight into the mechanical performance of salt caverns influenced by complicated stress states.http://www.sciencedirect.com/science/article/pii/S1674775523001208Rock saltCyclic mechanical loadingShear bandDilation bandUnderground gas storage (UGS) |
| spellingShingle | Jianfeng Liu Xiaosong Qiu Jianxiong Yang Chao Liang Jingjing Dai Yu Bian Failure transition of shear-to-dilation band of rock salt under triaxial stresses Journal of Rock Mechanics and Geotechnical Engineering Rock salt Cyclic mechanical loading Shear band Dilation band Underground gas storage (UGS) |
| title | Failure transition of shear-to-dilation band of rock salt under triaxial stresses |
| title_full | Failure transition of shear-to-dilation band of rock salt under triaxial stresses |
| title_fullStr | Failure transition of shear-to-dilation band of rock salt under triaxial stresses |
| title_full_unstemmed | Failure transition of shear-to-dilation band of rock salt under triaxial stresses |
| title_short | Failure transition of shear-to-dilation band of rock salt under triaxial stresses |
| title_sort | failure transition of shear to dilation band of rock salt under triaxial stresses |
| topic | Rock salt Cyclic mechanical loading Shear band Dilation band Underground gas storage (UGS) |
| url | http://www.sciencedirect.com/science/article/pii/S1674775523001208 |
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