Dynamic mechanical response and crack evolution law of raw coal loaded by dynamic-static coupling under three-dimensional constraints
Abstract This paper presents the investigation of the dynamic mechanical properties of coal rock under complex stress conditions at depth, based on the improved Separate Hopkinson Pressure Bar Test System. A total of 15 groups of coal samples were used to perform dynamic impact tests under different...
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| Format: | Article |
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Nature Portfolio
2024-04-01
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| Series: | Scientific Reports |
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| Online Access: | https://doi.org/10.1038/s41598-024-59135-y |
| _version_ | 1797199493237571584 |
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| author | ShunKun Zhao ShanYang Wei Lin Zhang Xianggui Tian XingZhuan Yang Xing Wang |
| author_facet | ShunKun Zhao ShanYang Wei Lin Zhang Xianggui Tian XingZhuan Yang Xing Wang |
| author_sort | ShunKun Zhao |
| collection | DOAJ |
| description | Abstract This paper presents the investigation of the dynamic mechanical properties of coal rock under complex stress conditions at depth, based on the improved Separate Hopkinson Pressure Bar Test System. A total of 15 groups of coal samples were used to perform dynamic impact tests under different conditions. The changing rules of dynamic strength, crushing, fractal dimension and damage modes of coal under different stress conditions were analyzed. A total of nine groups of coal samples were selected for numerical simulation using ANSYS/LS-DYNA. The results show that: (1) The stress–strain curves of coal specimens under different strain rates, different confining pressures and axial pressures have basically the same trend and the curves show a certain jump forward. (2) The peak dynamic stress of the coal specimens increased linearly with the increase of strain rate and confining pressure, and the ambient pressure limited the expansion of internal cracks of the coal specimens under impact loading. Based on the experimental and simulated data, the maximum relative errors between the experimental and simulated data were determined to be 2.9578% for Group A, 6.177% for Group B, and 6.382% for Group C, respectively. (3) The damage modes of the coal samples under the three-dimensional dynamic-static combined loading were mainly “X” type and “conical” shear damage. The fractal dimension increases with the increase of strain rate, decreases with the increase of confining pressure, and first decreases and then increases with the increase of axial pressure. This research achievement can provide theoretical support for the prevention of dynamic disasters in deep coal mine engineering. |
| first_indexed | 2024-04-24T07:16:38Z |
| format | Article |
| id | doaj.art-b4ee3b7b96844dfe8ba7460e9d2a352a |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-04-24T07:16:38Z |
| publishDate | 2024-04-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-b4ee3b7b96844dfe8ba7460e9d2a352a2024-04-21T11:16:38ZengNature PortfolioScientific Reports2045-23222024-04-0114111810.1038/s41598-024-59135-yDynamic mechanical response and crack evolution law of raw coal loaded by dynamic-static coupling under three-dimensional constraintsShunKun Zhao0ShanYang Wei1Lin Zhang2Xianggui Tian3XingZhuan Yang4Xing Wang5School of Mines, Guizhou UniversitySchool of Mines, Guizhou UniversitySchool of Mines, Guizhou UniversityGuizhou Panjiang Coal & Electricity Group Technology Research Institute Co.Bijie Zhongcheng Energy Co. LTDBijie Zhongcheng Energy Co. LTDAbstract This paper presents the investigation of the dynamic mechanical properties of coal rock under complex stress conditions at depth, based on the improved Separate Hopkinson Pressure Bar Test System. A total of 15 groups of coal samples were used to perform dynamic impact tests under different conditions. The changing rules of dynamic strength, crushing, fractal dimension and damage modes of coal under different stress conditions were analyzed. A total of nine groups of coal samples were selected for numerical simulation using ANSYS/LS-DYNA. The results show that: (1) The stress–strain curves of coal specimens under different strain rates, different confining pressures and axial pressures have basically the same trend and the curves show a certain jump forward. (2) The peak dynamic stress of the coal specimens increased linearly with the increase of strain rate and confining pressure, and the ambient pressure limited the expansion of internal cracks of the coal specimens under impact loading. Based on the experimental and simulated data, the maximum relative errors between the experimental and simulated data were determined to be 2.9578% for Group A, 6.177% for Group B, and 6.382% for Group C, respectively. (3) The damage modes of the coal samples under the three-dimensional dynamic-static combined loading were mainly “X” type and “conical” shear damage. The fractal dimension increases with the increase of strain rate, decreases with the increase of confining pressure, and first decreases and then increases with the increase of axial pressure. This research achievement can provide theoretical support for the prevention of dynamic disasters in deep coal mine engineering.https://doi.org/10.1038/s41598-024-59135-yDeep coal rockThree-dimensional dynamic and static combinationSHPBDynamic mechanical propertiesHJC constitutive model |
| spellingShingle | ShunKun Zhao ShanYang Wei Lin Zhang Xianggui Tian XingZhuan Yang Xing Wang Dynamic mechanical response and crack evolution law of raw coal loaded by dynamic-static coupling under three-dimensional constraints Scientific Reports Deep coal rock Three-dimensional dynamic and static combination SHPB Dynamic mechanical properties HJC constitutive model |
| title | Dynamic mechanical response and crack evolution law of raw coal loaded by dynamic-static coupling under three-dimensional constraints |
| title_full | Dynamic mechanical response and crack evolution law of raw coal loaded by dynamic-static coupling under three-dimensional constraints |
| title_fullStr | Dynamic mechanical response and crack evolution law of raw coal loaded by dynamic-static coupling under three-dimensional constraints |
| title_full_unstemmed | Dynamic mechanical response and crack evolution law of raw coal loaded by dynamic-static coupling under three-dimensional constraints |
| title_short | Dynamic mechanical response and crack evolution law of raw coal loaded by dynamic-static coupling under three-dimensional constraints |
| title_sort | dynamic mechanical response and crack evolution law of raw coal loaded by dynamic static coupling under three dimensional constraints |
| topic | Deep coal rock Three-dimensional dynamic and static combination SHPB Dynamic mechanical properties HJC constitutive model |
| url | https://doi.org/10.1038/s41598-024-59135-y |
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