Acoustic Emission Monitoring and Failure Precursors of Sandstone Samples under Various Loading and Unloading Paths
To explore the failure precursors of hard rock, a series of triaxial loading and unloading experiments were carried out on sandstone sample using the acoustic emission systems. The extreme-point symmetric mode decomposition method (ESMD method) was used to denoise and reconstruct the AE data. The AE...
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| Format: | Article |
| Language: | English |
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Wiley
2017-01-01
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| Series: | Shock and Vibration |
| Online Access: | http://dx.doi.org/10.1155/2017/9760940 |
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| author | Jie Xu Jingdong Jiang Lingling Zuo Yufeng Gao |
| author_facet | Jie Xu Jingdong Jiang Lingling Zuo Yufeng Gao |
| author_sort | Jie Xu |
| collection | DOAJ |
| description | To explore the failure precursors of hard rock, a series of triaxial loading and unloading experiments were carried out on sandstone sample using the acoustic emission systems. The extreme-point symmetric mode decomposition method (ESMD method) was used to denoise and reconstruct the AE data. The AE quiet period in Scheme I becomes much more obvious with the confining pressure increasing, which can be regarded as the precursor information of the sample failure under conventional triaxial compression. Unlike Scheme I, there are no obvious precursory characteristics before failure in Schemes II and III, and the count rate reaches the maximum at the peak point. When the stress ratio ranges from 0.8 to 1.0, the fractal values of acoustic emission can be used to investigate the failure precursors of samples at a lower confining pressure. When the time ratio is greater than 0.8 under higher confining pressures, the fractal values of sandstone samples under unloading paths are rapidly reduced, which can be used to predict rock failure at higher confining pressures. |
| format | Article |
| id | doaj-art-6664e1fa9408403cb57415f063c74629 |
| institution | Kabale University |
| issn | 1070-9622 1875-9203 |
| language | English |
| publishDate | 2017-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Shock and Vibration |
| spelling | doaj-art-6664e1fa9408403cb57415f063c746292025-08-20T03:34:47ZengWileyShock and Vibration1070-96221875-92032017-01-01201710.1155/2017/97609409760940Acoustic Emission Monitoring and Failure Precursors of Sandstone Samples under Various Loading and Unloading PathsJie Xu0Jingdong Jiang1Lingling Zuo2Yufeng Gao3Geotechnical Research Institute, Hohai University, Nanjing 210098, ChinaNanjing Hydraulic Research Institute, Nanjing 210029, ChinaLaixi Water Conservancy Bureau, Laixi 266600, ChinaGeotechnical Research Institute, Hohai University, Nanjing 210098, ChinaTo explore the failure precursors of hard rock, a series of triaxial loading and unloading experiments were carried out on sandstone sample using the acoustic emission systems. The extreme-point symmetric mode decomposition method (ESMD method) was used to denoise and reconstruct the AE data. The AE quiet period in Scheme I becomes much more obvious with the confining pressure increasing, which can be regarded as the precursor information of the sample failure under conventional triaxial compression. Unlike Scheme I, there are no obvious precursory characteristics before failure in Schemes II and III, and the count rate reaches the maximum at the peak point. When the stress ratio ranges from 0.8 to 1.0, the fractal values of acoustic emission can be used to investigate the failure precursors of samples at a lower confining pressure. When the time ratio is greater than 0.8 under higher confining pressures, the fractal values of sandstone samples under unloading paths are rapidly reduced, which can be used to predict rock failure at higher confining pressures.http://dx.doi.org/10.1155/2017/9760940 |
| spellingShingle | Jie Xu Jingdong Jiang Lingling Zuo Yufeng Gao Acoustic Emission Monitoring and Failure Precursors of Sandstone Samples under Various Loading and Unloading Paths Shock and Vibration |
| title | Acoustic Emission Monitoring and Failure Precursors of Sandstone Samples under Various Loading and Unloading Paths |
| title_full | Acoustic Emission Monitoring and Failure Precursors of Sandstone Samples under Various Loading and Unloading Paths |
| title_fullStr | Acoustic Emission Monitoring and Failure Precursors of Sandstone Samples under Various Loading and Unloading Paths |
| title_full_unstemmed | Acoustic Emission Monitoring and Failure Precursors of Sandstone Samples under Various Loading and Unloading Paths |
| title_short | Acoustic Emission Monitoring and Failure Precursors of Sandstone Samples under Various Loading and Unloading Paths |
| title_sort | acoustic emission monitoring and failure precursors of sandstone samples under various loading and unloading paths |
| url | http://dx.doi.org/10.1155/2017/9760940 |
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