Experimental study on the effects of rock mineral composition and loading rates on the acoustic emission and fracture characteristics in roof strata tensile fracture
The tensile fracture of the overlying strata in coal mines significantly affects the stability of the surrounding rock and the working face. This study investigates the effects of rock mineral composition and mining speed on roof strata fracture behavior through three-point bending tests under vario...
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Frontiers Media S.A.
2024-12-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2024.1476891/full |
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| author | Xiufeng Zhang Jiaxin Sun Yang Chen Cunwen Wang Chao Wang Chao Wang Wentao Ren Binwen Ma Binwen Ma |
| author_facet | Xiufeng Zhang Jiaxin Sun Yang Chen Cunwen Wang Chao Wang Chao Wang Wentao Ren Binwen Ma Binwen Ma |
| author_sort | Xiufeng Zhang |
| collection | DOAJ |
| description | The tensile fracture of the overlying strata in coal mines significantly affects the stability of the surrounding rock and the working face. This study investigates the effects of rock mineral composition and mining speed on roof strata fracture behavior through three-point bending tests under various mineral compositions and loading rates, simulating tensile fractures under different mining conditions. Fracture processes were monitored using an acoustic emission (AE) system and high-speed camera, with multifractal analysis and digital image correlation (DIC) applied to assess AE signal characteristics and crack propagation. Results indicated that siliceous sandstone (SS) exhibited more rapid and penetrating fractures compared to argillaceous sandstone (AS). Before reaching peak load, AS showed a broader multifractal spectrum width (Δα) than SS, reflecting its more ductile fracture behavior, which also resulted in higher Δα values in the post-peak stage. Both Δα and multifractal spectrum difference (Δf(α)) decreased with increasing loading rates for AS, indicating a weakening of the multifractal characteristics of the AE signals and a progressively dominant presence of strong signals. The fracture behavior in both rock types was dominated by tensile microcracks, along with tensile-shear composite and shear microcracks. Higher loading rates increased the proportion of tensile-shear composite and shear microcracks components in the AE signals, with the rate being lower in AS than SS. These findings provide a basis for predicting the characteristics of the tensile fracture of overlying strata in mined-out areas. |
| format | Article |
| id | doaj-art-bf18294d589f4bd5b3db4e61c06c1398 |
| institution | DOAJ |
| issn | 2296-6463 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Frontiers Media S.A. |
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| series | Frontiers in Earth Science |
| spelling | doaj-art-bf18294d589f4bd5b3db4e61c06c13982025-08-20T02:52:13ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632024-12-011210.3389/feart.2024.14768911476891Experimental study on the effects of rock mineral composition and loading rates on the acoustic emission and fracture characteristics in roof strata tensile fractureXiufeng Zhang0Jiaxin Sun1Yang Chen2Cunwen Wang3Chao Wang4Chao Wang5Wentao Ren6Binwen Ma7Binwen Ma8Shandong Energy Group Co., Ltd., Jinan, Shandong, ChinaInstitute of Deep Earth Sciences and Green Energy, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen, Guangdong, ChinaShandong Energy Group Co., Ltd., Jinan, Shandong, ChinaShandong Energy Group Co., Ltd., Jinan, Shandong, ChinaShandong Energy Group Co., Ltd., Jinan, Shandong, ChinaYanzhou Coal Industry Co., Ltd., Jining, Shandong, ChinaShandong Energy Group Luxi Mining Co., Ltd., Heze, Shandong, ChinaInstitute of Deep Earth Sciences and Green Energy, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen, Guangdong, ChinaSchool of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing, ChinaThe tensile fracture of the overlying strata in coal mines significantly affects the stability of the surrounding rock and the working face. This study investigates the effects of rock mineral composition and mining speed on roof strata fracture behavior through three-point bending tests under various mineral compositions and loading rates, simulating tensile fractures under different mining conditions. Fracture processes were monitored using an acoustic emission (AE) system and high-speed camera, with multifractal analysis and digital image correlation (DIC) applied to assess AE signal characteristics and crack propagation. Results indicated that siliceous sandstone (SS) exhibited more rapid and penetrating fractures compared to argillaceous sandstone (AS). Before reaching peak load, AS showed a broader multifractal spectrum width (Δα) than SS, reflecting its more ductile fracture behavior, which also resulted in higher Δα values in the post-peak stage. Both Δα and multifractal spectrum difference (Δf(α)) decreased with increasing loading rates for AS, indicating a weakening of the multifractal characteristics of the AE signals and a progressively dominant presence of strong signals. The fracture behavior in both rock types was dominated by tensile microcracks, along with tensile-shear composite and shear microcracks. Higher loading rates increased the proportion of tensile-shear composite and shear microcracks components in the AE signals, with the rate being lower in AS than SS. These findings provide a basis for predicting the characteristics of the tensile fracture of overlying strata in mined-out areas.https://www.frontiersin.org/articles/10.3389/feart.2024.1476891/fulloverlying roof stratatensile fractureacoustic emission monitoringfracture characteristicsmultiple fractals |
| spellingShingle | Xiufeng Zhang Jiaxin Sun Yang Chen Cunwen Wang Chao Wang Chao Wang Wentao Ren Binwen Ma Binwen Ma Experimental study on the effects of rock mineral composition and loading rates on the acoustic emission and fracture characteristics in roof strata tensile fracture Frontiers in Earth Science overlying roof strata tensile fracture acoustic emission monitoring fracture characteristics multiple fractals |
| title | Experimental study on the effects of rock mineral composition and loading rates on the acoustic emission and fracture characteristics in roof strata tensile fracture |
| title_full | Experimental study on the effects of rock mineral composition and loading rates on the acoustic emission and fracture characteristics in roof strata tensile fracture |
| title_fullStr | Experimental study on the effects of rock mineral composition and loading rates on the acoustic emission and fracture characteristics in roof strata tensile fracture |
| title_full_unstemmed | Experimental study on the effects of rock mineral composition and loading rates on the acoustic emission and fracture characteristics in roof strata tensile fracture |
| title_short | Experimental study on the effects of rock mineral composition and loading rates on the acoustic emission and fracture characteristics in roof strata tensile fracture |
| title_sort | experimental study on the effects of rock mineral composition and loading rates on the acoustic emission and fracture characteristics in roof strata tensile fracture |
| topic | overlying roof strata tensile fracture acoustic emission monitoring fracture characteristics multiple fractals |
| url | https://www.frontiersin.org/articles/10.3389/feart.2024.1476891/full |
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