Influence of loading system stiffness on unstable failure mode and energy evolution of sandstone under lateral constraints
In order to explore the influence of the stiffness of the loading system on rock failure mode and energy evolution law, the self-developed rigidity and variable stiffness test system is used to carry out biaxial compression tests, and the mechanism of the loading system stiffness on the post-peak un...
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| Format: | Article |
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Editorial Office of Journal of China Coal Society
2025-02-01
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| Series: | Meitan xuebao |
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| Online Access: | http://www.mtxb.com.cn/article/doi/10.13225/j.cnki.jccs.2024.0702 |
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| author | Guangming ZHAO Xukun WU Wensong XU Zhixi LIU Chongyan LIU Qihang ZHANG Jun ZHOU |
| author_facet | Guangming ZHAO Xukun WU Wensong XU Zhixi LIU Chongyan LIU Qihang ZHANG Jun ZHOU |
| author_sort | Guangming ZHAO |
| collection | DOAJ |
| description | In order to explore the influence of the stiffness of the loading system on rock failure mode and energy evolution law, the self-developed rigidity and variable stiffness test system is used to carry out biaxial compression tests, and the mechanism of the loading system stiffness on the post-peak unsteady failure and energy release law of rock under lateral constraints is analyzed. The results show that: The interaction between the rock sample and the testing machine system is analyzed from the perspective of energy dissipation and release, revealing the relationship between these factors during the rock failure process under the stiffness of the loading system. It can be divided into three modes: stable failure (Wd > Wu +We), critical state (Wd =Wu +We), and unstable failure (Wd < Wu +We). Under low stiffness conditions, the stress-strain curve of the rock sample shows significant stress drop and fluctuation, indicating local unsteady failure. In contrast, under high stiffness conditions, the post-peak stress of the rock sample decreases gradually, and the curve is stepped with a residual stage. With the increase of the stiffness of the loading system, the maximum strain energy release and maximum dissipative energy of the rock sample decrease nonlinearly, while the increase of the lateral binding force leads to the nonlinear increase of the maximum strain energy release and maximum dissipative energy. The application of lateral constraints strengthens the stiffness rebound effect and changes the energy release mode when the rock is fractured. In the early stage after the peak (∆Wpe > ∆Wpd), the energy release is relatively rapid, In the middle stage after the peak (∆Wpe < ∆Wpd), the energy is mainly dissipated, In the late stage after the peak (∆Wpe≈∆Wpd), the energy release and dissipation enter a stable stage. The research results provide a theoretical basis for understanding the post-peak failure mechanism of the loading system stiffness and dynamic disaster prevention, and propose measures such as lateral binding, phased energy control and reducing the energy storage capacity of the rock mass to improve the energy release mode, enhance energy dissipation, and enhance the stability of the surrounding rock of the roadway. |
| format | Article |
| id | doaj-art-0beff8cf2a934406b34bcb9ee5544ca9 |
| institution | OA Journals |
| issn | 0253-9993 |
| language | zho |
| publishDate | 2025-02-01 |
| publisher | Editorial Office of Journal of China Coal Society |
| record_format | Article |
| series | Meitan xuebao |
| spelling | doaj-art-0beff8cf2a934406b34bcb9ee5544ca92025-08-20T02:08:39ZzhoEditorial Office of Journal of China Coal SocietyMeitan xuebao0253-99932025-02-0150287788910.13225/j.cnki.jccs.2024.07022024-0702Influence of loading system stiffness on unstable failure mode and energy evolution of sandstone under lateral constraintsGuangming ZHAO0Xukun WU1Wensong XU2Zhixi LIU3Chongyan LIU4Qihang ZHANG5Jun ZHOU6Key Laboratory of Safe and Effective Coal Mining, Ministry of Education of China, Anhui University of Science and Technology, Huainan 232001, ChinaKey Laboratory of Safe and Effective Coal Mining, Ministry of Education of China, Anhui University of Science and Technology, Huainan 232001, ChinaKey Laboratory of Safe and Effective Coal Mining, Ministry of Education of China, Anhui University of Science and Technology, Huainan 232001, ChinaKey Laboratory of Safe and Effective Coal Mining, Ministry of Education of China, Anhui University of Science and Technology, Huainan 232001, ChinaKey Laboratory of Safe and Effective Coal Mining, Ministry of Education of China, Anhui University of Science and Technology, Huainan 232001, ChinaKey Laboratory of Safe and Effective Coal Mining, Ministry of Education of China, Anhui University of Science and Technology, Huainan 232001, ChinaState Key Laboratory of Precision Blasting, Jianghan University, Wuhan 430056, ChinaIn order to explore the influence of the stiffness of the loading system on rock failure mode and energy evolution law, the self-developed rigidity and variable stiffness test system is used to carry out biaxial compression tests, and the mechanism of the loading system stiffness on the post-peak unsteady failure and energy release law of rock under lateral constraints is analyzed. The results show that: The interaction between the rock sample and the testing machine system is analyzed from the perspective of energy dissipation and release, revealing the relationship between these factors during the rock failure process under the stiffness of the loading system. It can be divided into three modes: stable failure (Wd > Wu +We), critical state (Wd =Wu +We), and unstable failure (Wd < Wu +We). Under low stiffness conditions, the stress-strain curve of the rock sample shows significant stress drop and fluctuation, indicating local unsteady failure. In contrast, under high stiffness conditions, the post-peak stress of the rock sample decreases gradually, and the curve is stepped with a residual stage. With the increase of the stiffness of the loading system, the maximum strain energy release and maximum dissipative energy of the rock sample decrease nonlinearly, while the increase of the lateral binding force leads to the nonlinear increase of the maximum strain energy release and maximum dissipative energy. The application of lateral constraints strengthens the stiffness rebound effect and changes the energy release mode when the rock is fractured. In the early stage after the peak (∆Wpe > ∆Wpd), the energy release is relatively rapid, In the middle stage after the peak (∆Wpe < ∆Wpd), the energy is mainly dissipated, In the late stage after the peak (∆Wpe≈∆Wpd), the energy release and dissipation enter a stable stage. The research results provide a theoretical basis for understanding the post-peak failure mechanism of the loading system stiffness and dynamic disaster prevention, and propose measures such as lateral binding, phased energy control and reducing the energy storage capacity of the rock mass to improve the energy release mode, enhance energy dissipation, and enhance the stability of the surrounding rock of the roadway.http://www.mtxb.com.cn/article/doi/10.13225/j.cnki.jccs.2024.0702stiffness of loading systemlateral binding forceenergy release and dissipationpost-peak stressunsteady failure mode |
| spellingShingle | Guangming ZHAO Xukun WU Wensong XU Zhixi LIU Chongyan LIU Qihang ZHANG Jun ZHOU Influence of loading system stiffness on unstable failure mode and energy evolution of sandstone under lateral constraints Meitan xuebao stiffness of loading system lateral binding force energy release and dissipation post-peak stress unsteady failure mode |
| title | Influence of loading system stiffness on unstable failure mode and energy evolution of sandstone under lateral constraints |
| title_full | Influence of loading system stiffness on unstable failure mode and energy evolution of sandstone under lateral constraints |
| title_fullStr | Influence of loading system stiffness on unstable failure mode and energy evolution of sandstone under lateral constraints |
| title_full_unstemmed | Influence of loading system stiffness on unstable failure mode and energy evolution of sandstone under lateral constraints |
| title_short | Influence of loading system stiffness on unstable failure mode and energy evolution of sandstone under lateral constraints |
| title_sort | influence of loading system stiffness on unstable failure mode and energy evolution of sandstone under lateral constraints |
| topic | stiffness of loading system lateral binding force energy release and dissipation post-peak stress unsteady failure mode |
| url | http://www.mtxb.com.cn/article/doi/10.13225/j.cnki.jccs.2024.0702 |
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