Sandstone damage and acoustic emission characteristics under the cyclic loading and unloading of the intermediate principal stress of the true three-axis
The work aimed to study the damage and acoustic emission (AE) characteristics of sandstone under the cyclic disturbance stress during underground engineering excavation. Graded cyclic intermediate principal stress \begin{document}$ {\sigma }_{2} $\end{document} was tested using the rock-unloading te...
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Editorial Office of Journal of China Coal Society
2024-12-01
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| Series: | Meitan xuebao |
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| Online Access: | http://www.mtxb.com.cn/article/doi/10.13225/j.cnki.jccs.2023.1242 |
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| author | Chaotao FAN Yingming LI Chunliang DONG Guangming ZHAO Xiaoyu LU Minjie QI Xiangjun WANG |
| author_facet | Chaotao FAN Yingming LI Chunliang DONG Guangming ZHAO Xiaoyu LU Minjie QI Xiangjun WANG |
| author_sort | Chaotao FAN |
| collection | DOAJ |
| description | The work aimed to study the damage and acoustic emission (AE) characteristics of sandstone under the cyclic disturbance stress during underground engineering excavation. Graded cyclic intermediate principal stress \begin{document}$ {\sigma }_{2} $\end{document} was tested using the rock-unloading test system of the true three-axis disturbance and the AE system. The mechanical properties of sandstone were studied under \begin{document}$ {\sigma }_{2} $\end{document} to prove its damage law and AE characteristics, and the effect of intermediate principal stress under true triaxial cyclic process were revealed. The results showed that the graded cyclic loading and unloading of \begin{document}$ {\sigma }_{2} $\end{document} had a greater influence on ultimate intermediate principal stress \begin{document}$ {\varepsilon }_{{\mathrm{2max}}} $\end{document} and the smallest influence on ultimate minimum principal stress \begin{document}$ {\varepsilon }_{{\mathrm{3max}}} $\end{document}. \begin{document}$ {\sigma }_{2} $\end{document} caused \begin{document}$ {\varepsilon }_{{\mathrm{2max}}} $\end{document} and loading and unloading moduli to increase first and then decrease with increased minimum principal stress \begin{document}$ {\sigma }_{3} $\end{document}. Cyclically loading or unloading \begin{document}$ {\sigma }_{2} $\end{document} caused unstable failure to sandstone. When minimum principal stress \begin{document}$ {\sigma }_{3} $\end{document} was small, sandstone unloaded at \begin{document}$ {\sigma }_{2} $\end{document} and damaged as it approached \begin{document}$ {\sigma }_{3} $\end{document}. When \begin{document}$ {\sigma }_{3} $\end{document} was large, sandstone loaded at \begin{document}$ {\sigma }_{2} $\end{document} and damaged as it approached maximum principal stress \begin{document}$ {\sigma }_{1} $\end{document}. Growth rate \begin{document}$ \beta $\end{document} of corresponding rock-octahedron stress \begin{document}$ {\tau }_{8} $\end{document} was similar during failure (\begin{document}$ \beta $\end{document}=1.1260). Characteristic parameter RA-AF of AE signals was analyzed. The failure mode of the sandstone samples gradually shifted from tensile shear failure to shear failure with increased \begin{document}$ {\sigma }_{3} $\end{document}. Besides, the loading damage variable of sandstone increased first and then stabilized as \begin{document}$ {\sigma }_{2} $\end{document} increased. The unloading damage variable showed a significant S-shaped trend of deceleration, acceleration, and re-deceleration. |
| format | Article |
| id | doaj-art-1d041c74d4cb40cdbf0c93d2568f375d |
| institution | DOAJ |
| issn | 0253-9993 |
| language | zho |
| publishDate | 2024-12-01 |
| publisher | Editorial Office of Journal of China Coal Society |
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| series | Meitan xuebao |
| spelling | doaj-art-1d041c74d4cb40cdbf0c93d2568f375d2025-08-20T02:47:36ZzhoEditorial Office of Journal of China Coal SocietyMeitan xuebao0253-99932024-12-0149S286287210.13225/j.cnki.jccs.2023.12422023-1242Sandstone damage and acoustic emission characteristics under the cyclic loading and unloading of the intermediate principal stress of the true three-axisChaotao FAN0Yingming LI1Chunliang DONG2Guangming ZHAO3Xiaoyu LU4Minjie QI5Xiangjun WANG6State Key Laboratory of Deep Coal Mine Mining Response and Disaster Prevention and Control, Anhui University of Science and Technology, Huainan 232001, ChinaState Key Laboratory of Deep Coal Mine Mining Response and Disaster Prevention and Control, Anhui University of Science and Technology, Huainan 232001, ChinaState Key Laboratory of Deep Coal Mine Mining Response and Disaster Prevention and Control, Anhui University of Science and Technology, Huainan 232001, ChinaState Key Laboratory of Deep Coal Mine Mining Response and Disaster Prevention and Control, Anhui University of Science and Technology, Huainan 232001, ChinaSchool of Mechanics and Optoelectronics Physics, Anhui University of Science and Technology, Huainan 232001, ChinaSchool of Mining Engineering, Anhui University of Science and Technology, Huainan 232001, ChinaSchool of Mining Engineering, Anhui University of Science and Technology, Huainan 232001, ChinaThe work aimed to study the damage and acoustic emission (AE) characteristics of sandstone under the cyclic disturbance stress during underground engineering excavation. Graded cyclic intermediate principal stress \begin{document}$ {\sigma }_{2} $\end{document} was tested using the rock-unloading test system of the true three-axis disturbance and the AE system. The mechanical properties of sandstone were studied under \begin{document}$ {\sigma }_{2} $\end{document} to prove its damage law and AE characteristics, and the effect of intermediate principal stress under true triaxial cyclic process were revealed. The results showed that the graded cyclic loading and unloading of \begin{document}$ {\sigma }_{2} $\end{document} had a greater influence on ultimate intermediate principal stress \begin{document}$ {\varepsilon }_{{\mathrm{2max}}} $\end{document} and the smallest influence on ultimate minimum principal stress \begin{document}$ {\varepsilon }_{{\mathrm{3max}}} $\end{document}. \begin{document}$ {\sigma }_{2} $\end{document} caused \begin{document}$ {\varepsilon }_{{\mathrm{2max}}} $\end{document} and loading and unloading moduli to increase first and then decrease with increased minimum principal stress \begin{document}$ {\sigma }_{3} $\end{document}. Cyclically loading or unloading \begin{document}$ {\sigma }_{2} $\end{document} caused unstable failure to sandstone. When minimum principal stress \begin{document}$ {\sigma }_{3} $\end{document} was small, sandstone unloaded at \begin{document}$ {\sigma }_{2} $\end{document} and damaged as it approached \begin{document}$ {\sigma }_{3} $\end{document}. When \begin{document}$ {\sigma }_{3} $\end{document} was large, sandstone loaded at \begin{document}$ {\sigma }_{2} $\end{document} and damaged as it approached maximum principal stress \begin{document}$ {\sigma }_{1} $\end{document}. Growth rate \begin{document}$ \beta $\end{document} of corresponding rock-octahedron stress \begin{document}$ {\tau }_{8} $\end{document} was similar during failure (\begin{document}$ \beta $\end{document}=1.1260). Characteristic parameter RA-AF of AE signals was analyzed. The failure mode of the sandstone samples gradually shifted from tensile shear failure to shear failure with increased \begin{document}$ {\sigma }_{3} $\end{document}. Besides, the loading damage variable of sandstone increased first and then stabilized as \begin{document}$ {\sigma }_{2} $\end{document} increased. The unloading damage variable showed a significant S-shaped trend of deceleration, acceleration, and re-deceleration.http://www.mtxb.com.cn/article/doi/10.13225/j.cnki.jccs.2023.1242rock mechanicscyclic intermediate principal stressresidual deformationelastic modulusdamage variablera-af |
| spellingShingle | Chaotao FAN Yingming LI Chunliang DONG Guangming ZHAO Xiaoyu LU Minjie QI Xiangjun WANG Sandstone damage and acoustic emission characteristics under the cyclic loading and unloading of the intermediate principal stress of the true three-axis Meitan xuebao rock mechanics cyclic intermediate principal stress residual deformation elastic modulus damage variable ra-af |
| title | Sandstone damage and acoustic emission characteristics under the cyclic loading and unloading of the intermediate principal stress of the true three-axis |
| title_full | Sandstone damage and acoustic emission characteristics under the cyclic loading and unloading of the intermediate principal stress of the true three-axis |
| title_fullStr | Sandstone damage and acoustic emission characteristics under the cyclic loading and unloading of the intermediate principal stress of the true three-axis |
| title_full_unstemmed | Sandstone damage and acoustic emission characteristics under the cyclic loading and unloading of the intermediate principal stress of the true three-axis |
| title_short | Sandstone damage and acoustic emission characteristics under the cyclic loading and unloading of the intermediate principal stress of the true three-axis |
| title_sort | sandstone damage and acoustic emission characteristics under the cyclic loading and unloading of the intermediate principal stress of the true three axis |
| topic | rock mechanics cyclic intermediate principal stress residual deformation elastic modulus damage variable ra-af |
| url | http://www.mtxb.com.cn/article/doi/10.13225/j.cnki.jccs.2023.1242 |
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