Triaxial direct shear behavior and strength evaluation of granite under two high-temperature and stress-coupled conditions in deep underground openings
Abstract The triaxial direct shear behavior of granite under high-temperature and stress-coupled conditions is critical for the safety evaluation of underground openings exposed to elevated temperatures, such as those in high-level radioactive waste disposal facilities. This study investigates the i...
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Springer
2025-04-01
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| Series: | Geomechanics and Geophysics for Geo-Energy and Geo-Resources |
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| Online Access: | https://doi.org/10.1007/s40948-025-00961-3 |
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| author | Binhui Liu Zaobao Liu Jianyu Xu Liang Chen Feng Tian Biao Wang Qiang Yang Hongsu Ma |
| author_facet | Binhui Liu Zaobao Liu Jianyu Xu Liang Chen Feng Tian Biao Wang Qiang Yang Hongsu Ma |
| author_sort | Binhui Liu |
| collection | DOAJ |
| description | Abstract The triaxial direct shear behavior of granite under high-temperature and stress-coupled conditions is critical for the safety evaluation of underground openings exposed to elevated temperatures, such as those in high-level radioactive waste disposal facilities. This study investigates the influence of thermal–mechanical coupling methods on the triaxial direct shear behavior of granite sourced from the Beishan Underground Research Laboratory in China by a self-developed triaxial direct shearing device. Two distinct thermal–mechanical loading paths were tested: (1) stress applied after temperature increase (SAT) and stress applied before temperature increase (SBT), with the latter simulating in situ host rock conditions. The results reveal that the peak direct shear strength of Beishan granite at a normal stress of 15 MPa decreased monotonically by approximately 5.45% as the temperature increased from room temperature to 150 °C under the SBT loading path. In contrast, under the SAT loading path, the peak strength initially increased by 28.5% from room temperature to 90 °C, followed by a subsequent decrease of 26.6% from 90 to 150 °C. These differences are attributed to the dual effects of thermal expansion in granite minerals, which are influenced by the temperature-stress coupling path. An integrated evaluation index M was developed to assess the granite strength evolution under high temperatures. When the evaluation index M > 5, the granite exhibits thermal strengthening; conversely, when M ≤ 5, the strength decreases in real-time high-temperature tests. These findings provide valuable insights for the stability assessment of engineering projects subjected to high stress and temperature conditions. |
| format | Article |
| id | doaj-art-d964abbca87845f69453363f0d5d29c0 |
| institution | Kabale University |
| issn | 2363-8419 2363-8427 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | Springer |
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| series | Geomechanics and Geophysics for Geo-Energy and Geo-Resources |
| spelling | doaj-art-d964abbca87845f69453363f0d5d29c02025-08-20T03:53:32ZengSpringerGeomechanics and Geophysics for Geo-Energy and Geo-Resources2363-84192363-84272025-04-0111112210.1007/s40948-025-00961-3Triaxial direct shear behavior and strength evaluation of granite under two high-temperature and stress-coupled conditions in deep underground openingsBinhui Liu0Zaobao Liu1Jianyu Xu2Liang Chen3Feng Tian4Biao Wang5Qiang Yang6Hongsu Ma7State Key Laboratory of Intelligent Deep Metal Mining and Equipment, Northeastern UniversityState Key Laboratory of Intelligent Deep Metal Mining and Equipment, Northeastern UniversityState Key Laboratory of Intelligent Deep Metal Mining and Equipment, Northeastern UniversityCAEA Innovation Center for Geological Disposal of High-Level Radioactive Waste, Beijing Research Institute of Uranium GeologyState Key Laboratory of Intelligent Deep Metal Mining and Equipment, Northeastern UniversityState Key Laboratory of Intelligent Deep Metal Mining and Equipment, Northeastern UniversityState Key Laboratory of Intelligent Deep Metal Mining and Equipment, Northeastern UniversityCAEA Innovation Center for Geological Disposal of High-Level Radioactive Waste, Beijing Research Institute of Uranium GeologyAbstract The triaxial direct shear behavior of granite under high-temperature and stress-coupled conditions is critical for the safety evaluation of underground openings exposed to elevated temperatures, such as those in high-level radioactive waste disposal facilities. This study investigates the influence of thermal–mechanical coupling methods on the triaxial direct shear behavior of granite sourced from the Beishan Underground Research Laboratory in China by a self-developed triaxial direct shearing device. Two distinct thermal–mechanical loading paths were tested: (1) stress applied after temperature increase (SAT) and stress applied before temperature increase (SBT), with the latter simulating in situ host rock conditions. The results reveal that the peak direct shear strength of Beishan granite at a normal stress of 15 MPa decreased monotonically by approximately 5.45% as the temperature increased from room temperature to 150 °C under the SBT loading path. In contrast, under the SAT loading path, the peak strength initially increased by 28.5% from room temperature to 90 °C, followed by a subsequent decrease of 26.6% from 90 to 150 °C. These differences are attributed to the dual effects of thermal expansion in granite minerals, which are influenced by the temperature-stress coupling path. An integrated evaluation index M was developed to assess the granite strength evolution under high temperatures. When the evaluation index M > 5, the granite exhibits thermal strengthening; conversely, when M ≤ 5, the strength decreases in real-time high-temperature tests. These findings provide valuable insights for the stability assessment of engineering projects subjected to high stress and temperature conditions.https://doi.org/10.1007/s40948-025-00961-3GraniteTriaxial direct shearHigh temperature and high-stress couplingShear strengthDeep rock engineering |
| spellingShingle | Binhui Liu Zaobao Liu Jianyu Xu Liang Chen Feng Tian Biao Wang Qiang Yang Hongsu Ma Triaxial direct shear behavior and strength evaluation of granite under two high-temperature and stress-coupled conditions in deep underground openings Geomechanics and Geophysics for Geo-Energy and Geo-Resources Granite Triaxial direct shear High temperature and high-stress coupling Shear strength Deep rock engineering |
| title | Triaxial direct shear behavior and strength evaluation of granite under two high-temperature and stress-coupled conditions in deep underground openings |
| title_full | Triaxial direct shear behavior and strength evaluation of granite under two high-temperature and stress-coupled conditions in deep underground openings |
| title_fullStr | Triaxial direct shear behavior and strength evaluation of granite under two high-temperature and stress-coupled conditions in deep underground openings |
| title_full_unstemmed | Triaxial direct shear behavior and strength evaluation of granite under two high-temperature and stress-coupled conditions in deep underground openings |
| title_short | Triaxial direct shear behavior and strength evaluation of granite under two high-temperature and stress-coupled conditions in deep underground openings |
| title_sort | triaxial direct shear behavior and strength evaluation of granite under two high temperature and stress coupled conditions in deep underground openings |
| topic | Granite Triaxial direct shear High temperature and high-stress coupling Shear strength Deep rock engineering |
| url | https://doi.org/10.1007/s40948-025-00961-3 |
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