Acoustic Emission Characteristics and Failure Mechanism of Fractured Rock under Different Loading Rates
To study the loading rate dependence of acoustic emissions and the failure mechanism of fractured rock, biaxial compression tests performed on granite were numerically simulated using the bonded particle model in Particle Flow Code (PFC). Uniaxial tests on a sample containing a single open fracture...
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| Main Authors: | , , , , , |
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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/10.1155/2017/5387459 |
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| _version_ | 1832554147971334144 |
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| author | Yongzheng Zhang Gang Wang Yujing Jiang Shugang Wang Honghua Zhao Wenjun Jing |
| author_facet | Yongzheng Zhang Gang Wang Yujing Jiang Shugang Wang Honghua Zhao Wenjun Jing |
| author_sort | Yongzheng Zhang |
| collection | DOAJ |
| description | To study the loading rate dependence of acoustic emissions and the failure mechanism of fractured rock, biaxial compression tests performed on granite were numerically simulated using the bonded particle model in Particle Flow Code (PFC). Uniaxial tests on a sample containing a single open fracture were simulated under different loading rates ranging from 0.005 to 0.5 m/s. Our results demonstrate the following. (1) The overall trends of stress and strain changes are not affected by the loading rate; the loading rate only affects the strain required to reach each stage. (2) The strain energy rate and acoustic emission (AE) events are affected by the loading rate in fractured rock. With an increase in the loading rate, AE events and the strain energy rate initially increase and then decrease, forming a fluctuating trend. (3) Under an external load, the particles within a specimen are constantly squeezed, rotated, and displaced. This process is accompanied by energy dissipation via the production of internal tensile and shear cracks; their propagation and coalescence result in the formation of a macroscopic rupture zone. |
| format | Article |
| id | doaj-art-5481f14ebf5e4635b5888ab667114eba |
| 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-5481f14ebf5e4635b5888ab667114eba2025-02-03T05:52:15ZengWileyShock and Vibration1070-96221875-92032017-01-01201710.1155/2017/53874595387459Acoustic Emission Characteristics and Failure Mechanism of Fractured Rock under Different Loading RatesYongzheng Zhang0Gang Wang1Yujing Jiang2Shugang Wang3Honghua Zhao4Wenjun Jing5Shandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation, Shandong University of Science and Technology, Qingdao 266590, ChinaShandong Provincial Key Laboratory of Civil Engineering Disaster Prevention and Mitigation, Shandong University of Science and Technology, Qingdao 266590, ChinaState Key Laboratory of Mining Disaster Prevention and Control Co-Founded by Shandong Province and the Ministry of Science and Technology, Shandong University of Science and Technology, Qingdao 266590, ChinaResearch Center of Geotechnical and Structural Engineering, Shandong University, Jinan 250061, ChinaState Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024, ChinaCollege of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266555, ChinaTo study the loading rate dependence of acoustic emissions and the failure mechanism of fractured rock, biaxial compression tests performed on granite were numerically simulated using the bonded particle model in Particle Flow Code (PFC). Uniaxial tests on a sample containing a single open fracture were simulated under different loading rates ranging from 0.005 to 0.5 m/s. Our results demonstrate the following. (1) The overall trends of stress and strain changes are not affected by the loading rate; the loading rate only affects the strain required to reach each stage. (2) The strain energy rate and acoustic emission (AE) events are affected by the loading rate in fractured rock. With an increase in the loading rate, AE events and the strain energy rate initially increase and then decrease, forming a fluctuating trend. (3) Under an external load, the particles within a specimen are constantly squeezed, rotated, and displaced. This process is accompanied by energy dissipation via the production of internal tensile and shear cracks; their propagation and coalescence result in the formation of a macroscopic rupture zone.http://dx.doi.org/10.1155/2017/5387459 |
| spellingShingle | Yongzheng Zhang Gang Wang Yujing Jiang Shugang Wang Honghua Zhao Wenjun Jing Acoustic Emission Characteristics and Failure Mechanism of Fractured Rock under Different Loading Rates Shock and Vibration |
| title | Acoustic Emission Characteristics and Failure Mechanism of Fractured Rock under Different Loading Rates |
| title_full | Acoustic Emission Characteristics and Failure Mechanism of Fractured Rock under Different Loading Rates |
| title_fullStr | Acoustic Emission Characteristics and Failure Mechanism of Fractured Rock under Different Loading Rates |
| title_full_unstemmed | Acoustic Emission Characteristics and Failure Mechanism of Fractured Rock under Different Loading Rates |
| title_short | Acoustic Emission Characteristics and Failure Mechanism of Fractured Rock under Different Loading Rates |
| title_sort | acoustic emission characteristics and failure mechanism of fractured rock under different loading rates |
| url | http://dx.doi.org/10.1155/2017/5387459 |
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