Crack initiation of granite under uniaxial compression tests: A comparison study
In this study, a combination of acoustic emission (AE) method (AEM) and wave transmission method (WTM) is used to investigate the behaviors of AE and ultrasonic properties corresponding to initial fracturing in granitic rocks. The relationships of AE characteristics, frequency spectra, and spatial l...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2020-06-01
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| Series: | Journal of Rock Mechanics and Geotechnical Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674775520300299 |
| _version_ | 1818963296243417088 |
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| author | G.K. Zhang H.B. Li M.Y. Wang X.F. Li |
| author_facet | G.K. Zhang H.B. Li M.Y. Wang X.F. Li |
| author_sort | G.K. Zhang |
| collection | DOAJ |
| description | In this study, a combination of acoustic emission (AE) method (AEM) and wave transmission method (WTM) is used to investigate the behaviors of AE and ultrasonic properties corresponding to initial fracturing in granitic rocks. The relationships of AE characteristics, frequency spectra, and spatial locations with crack initiation (CI) are studied. The anisotropic ultrasonic characteristics, velocity distributions in different ray paths, wave amplitudes, and spectral characters of transmitted waves are investigated. To identify CI stress, damage initiations characterized by strain-based method (SBM), AEM and WTM are compared. For granite samples, it shows that the ratio of CI stress to peak strength estimated by SBM ranges from 0.4 to 0.55, and 0.49–0.6 by WTM, which are higher than that of AEM (0.38–0.46). The CI stress identified by AEM indicates the onset of microcracking, and the combination of AEM and WTM provides an insight into the detection of rock damage initiation and anisotropy. |
| first_indexed | 2024-12-20T12:42:58Z |
| format | Article |
| id | doaj.art-8ab44778b390458584562e61e571d9b8 |
| institution | Directory Open Access Journal |
| issn | 1674-7755 |
| language | English |
| last_indexed | 2024-12-20T12:42:58Z |
| publishDate | 2020-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Rock Mechanics and Geotechnical Engineering |
| spelling | doaj.art-8ab44778b390458584562e61e571d9b82022-12-21T19:40:24ZengElsevierJournal of Rock Mechanics and Geotechnical Engineering1674-77552020-06-01123656666Crack initiation of granite under uniaxial compression tests: A comparison studyG.K. Zhang0H.B. Li1M.Y. Wang2X.F. Li3State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China; School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, ChinaState Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China; University of Chinese Academy of Sciences, Beijing, 100049, ChinaSchool of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, ChinaState Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, China; University of Chinese Academy of Sciences, Beijing, 100049, China; Corresponding author.In this study, a combination of acoustic emission (AE) method (AEM) and wave transmission method (WTM) is used to investigate the behaviors of AE and ultrasonic properties corresponding to initial fracturing in granitic rocks. The relationships of AE characteristics, frequency spectra, and spatial locations with crack initiation (CI) are studied. The anisotropic ultrasonic characteristics, velocity distributions in different ray paths, wave amplitudes, and spectral characters of transmitted waves are investigated. To identify CI stress, damage initiations characterized by strain-based method (SBM), AEM and WTM are compared. For granite samples, it shows that the ratio of CI stress to peak strength estimated by SBM ranges from 0.4 to 0.55, and 0.49–0.6 by WTM, which are higher than that of AEM (0.38–0.46). The CI stress identified by AEM indicates the onset of microcracking, and the combination of AEM and WTM provides an insight into the detection of rock damage initiation and anisotropy.http://www.sciencedirect.com/science/article/pii/S1674775520300299Crack initiation (CI) stressAcoustic emission (AE)Ultrasonic transmissionWave velocityGranite |
| spellingShingle | G.K. Zhang H.B. Li M.Y. Wang X.F. Li Crack initiation of granite under uniaxial compression tests: A comparison study Journal of Rock Mechanics and Geotechnical Engineering Crack initiation (CI) stress Acoustic emission (AE) Ultrasonic transmission Wave velocity Granite |
| title | Crack initiation of granite under uniaxial compression tests: A comparison study |
| title_full | Crack initiation of granite under uniaxial compression tests: A comparison study |
| title_fullStr | Crack initiation of granite under uniaxial compression tests: A comparison study |
| title_full_unstemmed | Crack initiation of granite under uniaxial compression tests: A comparison study |
| title_short | Crack initiation of granite under uniaxial compression tests: A comparison study |
| title_sort | crack initiation of granite under uniaxial compression tests a comparison study |
| topic | Crack initiation (CI) stress Acoustic emission (AE) Ultrasonic transmission Wave velocity Granite |
| url | http://www.sciencedirect.com/science/article/pii/S1674775520300299 |
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