Multiscale Pore Structure Characteristics and Crack Propagation Behavior of Coal Samples from High Gas Seam
Investigation on the pore-fracture features and crack propagation behavior of coal is necessary to prevent coal mine disasters. The pore structure features of coal samples taken from high gas seam were obtained by mercury injection porosimetry (MIP) and gas adsorption methods. The process of deforma...
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MDPI AG
2022-06-01
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| author | Jie Zhu Tangsha Shao Guiyou Li Yuhang Yang Zhen Chen Tianxiang Lan Jinge Wang Yuhan Zhao Shuangqing Liu |
| author_facet | Jie Zhu Tangsha Shao Guiyou Li Yuhang Yang Zhen Chen Tianxiang Lan Jinge Wang Yuhan Zhao Shuangqing Liu |
| author_sort | Jie Zhu |
| collection | DOAJ |
| description | Investigation on the pore-fracture features and crack propagation behavior of coal is necessary to prevent coal mine disasters. The pore structure features of coal samples taken from high gas seam were obtained by mercury injection porosimetry (MIP) and gas adsorption methods. The process of deformation and failure for coal samples under three-point bending conditions were obtained. The results demonstrate that the adsorption pores with diameter less than 100 nm are the most developed and their surfaces are the roughest (the average surface fractal dimension <i>D</i><sub>s</sub> is 2.933). The surface of micro-cracks is smoother (<i>D</i><sub>s</sub> is 2.481), which is conducive to gas seepage. It may be the explanation for that 14-3# coal seam is a high gas seam, while there was almost no gas outburst accident so far. At the initial stage of crack propagation, the main crack on the coal sample expanded along the direction of the natural cracks. In the process of crack propagation, the surface fractal dimension of the main crack increased, suggesting that the bending degree of the main crack enhanced. The brittle characteristics of coal samples can be reflected by the ratio of the dissipated energy to the accumulated energy. |
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| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-09T04:03:55Z |
| publishDate | 2022-06-01 |
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| spelling | doaj.art-c0e0b6d2c1394d6eae823450f1ec40512023-12-03T14:10:09ZengMDPI AGMaterials1996-19442022-06-011513450010.3390/ma15134500Multiscale Pore Structure Characteristics and Crack Propagation Behavior of Coal Samples from High Gas SeamJie Zhu0Tangsha Shao1Guiyou Li2Yuhang Yang3Zhen Chen4Tianxiang Lan5Jinge Wang6Yuhan Zhao7Shuangqing Liu8School of Mechanics & Civil Engineering, China University of Mining & Technology (Beijing), Beijing 100083, ChinaSchool of Mechanics & Civil Engineering, China University of Mining & Technology (Beijing), Beijing 100083, ChinaSchool of Mechanics & Civil Engineering, China University of Mining & Technology (Beijing), Beijing 100083, ChinaSchool of Mechanics & Civil Engineering, China University of Mining & Technology (Beijing), Beijing 100083, ChinaSchool of Mechanics & Civil Engineering, China University of Mining & Technology (Beijing), Beijing 100083, ChinaSchool of Mechanics & Civil Engineering, China University of Mining & Technology (Beijing), Beijing 100083, ChinaSchool of Mechanics & Civil Engineering, China University of Mining & Technology (Beijing), Beijing 100083, ChinaSchool of Mechanics & Civil Engineering, China University of Mining & Technology (Beijing), Beijing 100083, ChinaSchool of Mechanics & Civil Engineering, China University of Mining & Technology (Beijing), Beijing 100083, ChinaInvestigation on the pore-fracture features and crack propagation behavior of coal is necessary to prevent coal mine disasters. The pore structure features of coal samples taken from high gas seam were obtained by mercury injection porosimetry (MIP) and gas adsorption methods. The process of deformation and failure for coal samples under three-point bending conditions were obtained. The results demonstrate that the adsorption pores with diameter less than 100 nm are the most developed and their surfaces are the roughest (the average surface fractal dimension <i>D</i><sub>s</sub> is 2.933). The surface of micro-cracks is smoother (<i>D</i><sub>s</sub> is 2.481), which is conducive to gas seepage. It may be the explanation for that 14-3# coal seam is a high gas seam, while there was almost no gas outburst accident so far. At the initial stage of crack propagation, the main crack on the coal sample expanded along the direction of the natural cracks. In the process of crack propagation, the surface fractal dimension of the main crack increased, suggesting that the bending degree of the main crack enhanced. The brittle characteristics of coal samples can be reflected by the ratio of the dissipated energy to the accumulated energy.https://www.mdpi.com/1996-1944/15/13/4500pore size distributions (PSDs)crack propagationsurface fractal dimensionmercury injection porosimetry (MIP)three-point bendinghigh gas coal seam |
| spellingShingle | Jie Zhu Tangsha Shao Guiyou Li Yuhang Yang Zhen Chen Tianxiang Lan Jinge Wang Yuhan Zhao Shuangqing Liu Multiscale Pore Structure Characteristics and Crack Propagation Behavior of Coal Samples from High Gas Seam Materials pore size distributions (PSDs) crack propagation surface fractal dimension mercury injection porosimetry (MIP) three-point bending high gas coal seam |
| title | Multiscale Pore Structure Characteristics and Crack Propagation Behavior of Coal Samples from High Gas Seam |
| title_full | Multiscale Pore Structure Characteristics and Crack Propagation Behavior of Coal Samples from High Gas Seam |
| title_fullStr | Multiscale Pore Structure Characteristics and Crack Propagation Behavior of Coal Samples from High Gas Seam |
| title_full_unstemmed | Multiscale Pore Structure Characteristics and Crack Propagation Behavior of Coal Samples from High Gas Seam |
| title_short | Multiscale Pore Structure Characteristics and Crack Propagation Behavior of Coal Samples from High Gas Seam |
| title_sort | multiscale pore structure characteristics and crack propagation behavior of coal samples from high gas seam |
| topic | pore size distributions (PSDs) crack propagation surface fractal dimension mercury injection porosimetry (MIP) three-point bending high gas coal seam |
| url | https://www.mdpi.com/1996-1944/15/13/4500 |
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