Experimental study on the failure characteristic and mechanism of granite time-delayed rockburst under true triaxial condition
Abstract A series of tests for time-delayed rockburst of granite under true triaxial condition was designed and carried out. By using the true triaxial rockburst test system, an acoustic emission (AE) system, a high-speed camera system, and a digital image motion analysis software, the time-delayed...
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| Format: | Article |
| Language: | English |
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Springer
2023-12-01
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| Series: | Geomechanics and Geophysics for Geo-Energy and Geo-Resources |
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| Online Access: | https://doi.org/10.1007/s40948-023-00706-0 |
| _version_ | 1797397687038902272 |
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| author | Guang-liang Feng Qi Ma Giuseppe Lacidogna Peng-zhi Pan Zhao-feng Wang Guo-shao Su |
| author_facet | Guang-liang Feng Qi Ma Giuseppe Lacidogna Peng-zhi Pan Zhao-feng Wang Guo-shao Su |
| author_sort | Guang-liang Feng |
| collection | DOAJ |
| description | Abstract A series of tests for time-delayed rockburst of granite under true triaxial condition was designed and carried out. By using the true triaxial rockburst test system, an acoustic emission (AE) system, a high-speed camera system, and a digital image motion analysis software, the time-delayed rockburst development process was monitored and studied. Four stages were found in the failure of granite time-delayed rockburst, i.e. grains ejection, slab breaks and ejects, first fragments ejection and second fragments ejection. There is a “V” shear crack generated in the time-delayed rockburst sample, and several tensile cracks in the lower part of the rock sample cross through the “V” shear crack. The longer the duration (the time elapsed between the moments the AE hits rises rapidly and the rockburst occurs), the smaller the depth of the rockburst pit. The time-delayed rockburst debris are mainly composed of blocks and fragments. The longer the duration, the smaller the total debris mass, the percentage of ejected debris and the ejection kinetic energy. The fractal dimension of the debris is positively correlated with the duration. The longer the duration, the higher the degree of fragmentation. The cracks generated are tensile-shear composite cracks. In the loading stage, it is dominated by shear cracks. However, in the time-lag stage, it is dominated by tensile cracks. With the increase of the duration, the proportion of tensile cracks increased and the proportion of shear cracks decreased. The research results will have a certain reference value for the warning and risk mitigation of time-delayed rockbursts. |
| first_indexed | 2024-03-09T01:13:47Z |
| format | Article |
| id | doaj.art-8a4c1d8cf88c4257ab1efb990d77f8e9 |
| institution | Directory Open Access Journal |
| issn | 2363-8419 2363-8427 |
| language | English |
| last_indexed | 2024-03-09T01:13:47Z |
| publishDate | 2023-12-01 |
| publisher | Springer |
| record_format | Article |
| series | Geomechanics and Geophysics for Geo-Energy and Geo-Resources |
| spelling | doaj.art-8a4c1d8cf88c4257ab1efb990d77f8e92023-12-10T12:35:44ZengSpringerGeomechanics and Geophysics for Geo-Energy and Geo-Resources2363-84192363-84272023-12-019112110.1007/s40948-023-00706-0Experimental study on the failure characteristic and mechanism of granite time-delayed rockburst under true triaxial conditionGuang-liang Feng0Qi Ma1Giuseppe Lacidogna2Peng-zhi Pan3Zhao-feng Wang4Guo-shao Su5State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of SciencesState Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of SciencesDepartment of Structural, Geotechnical and Building Engineering, Politecnico di TorinoState Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of SciencesState Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of SciencesGuangxi Key Laboratory of Disaster Prevention and Engineering SafetyAbstract A series of tests for time-delayed rockburst of granite under true triaxial condition was designed and carried out. By using the true triaxial rockburst test system, an acoustic emission (AE) system, a high-speed camera system, and a digital image motion analysis software, the time-delayed rockburst development process was monitored and studied. Four stages were found in the failure of granite time-delayed rockburst, i.e. grains ejection, slab breaks and ejects, first fragments ejection and second fragments ejection. There is a “V” shear crack generated in the time-delayed rockburst sample, and several tensile cracks in the lower part of the rock sample cross through the “V” shear crack. The longer the duration (the time elapsed between the moments the AE hits rises rapidly and the rockburst occurs), the smaller the depth of the rockburst pit. The time-delayed rockburst debris are mainly composed of blocks and fragments. The longer the duration, the smaller the total debris mass, the percentage of ejected debris and the ejection kinetic energy. The fractal dimension of the debris is positively correlated with the duration. The longer the duration, the higher the degree of fragmentation. The cracks generated are tensile-shear composite cracks. In the loading stage, it is dominated by shear cracks. However, in the time-lag stage, it is dominated by tensile cracks. With the increase of the duration, the proportion of tensile cracks increased and the proportion of shear cracks decreased. The research results will have a certain reference value for the warning and risk mitigation of time-delayed rockbursts.https://doi.org/10.1007/s40948-023-00706-0True triaxialTime-delayed rockburstCrack evolution characteristicsMacro failure characteristicsAE |
| spellingShingle | Guang-liang Feng Qi Ma Giuseppe Lacidogna Peng-zhi Pan Zhao-feng Wang Guo-shao Su Experimental study on the failure characteristic and mechanism of granite time-delayed rockburst under true triaxial condition Geomechanics and Geophysics for Geo-Energy and Geo-Resources True triaxial Time-delayed rockburst Crack evolution characteristics Macro failure characteristics AE |
| title | Experimental study on the failure characteristic and mechanism of granite time-delayed rockburst under true triaxial condition |
| title_full | Experimental study on the failure characteristic and mechanism of granite time-delayed rockburst under true triaxial condition |
| title_fullStr | Experimental study on the failure characteristic and mechanism of granite time-delayed rockburst under true triaxial condition |
| title_full_unstemmed | Experimental study on the failure characteristic and mechanism of granite time-delayed rockburst under true triaxial condition |
| title_short | Experimental study on the failure characteristic and mechanism of granite time-delayed rockburst under true triaxial condition |
| title_sort | experimental study on the failure characteristic and mechanism of granite time delayed rockburst under true triaxial condition |
| topic | True triaxial Time-delayed rockburst Crack evolution characteristics Macro failure characteristics AE |
| url | https://doi.org/10.1007/s40948-023-00706-0 |
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