The strength characteristics and progressive failure mechanism of soft rock-coal combination samples with consideration given to interface effects
The coal-measure rock masses of China's Ordos Basin are mainly composed of typical soft rock with low strength, which bear loads together with the coal seams during coal mining activities. Accurately determining the mechanical behaviors of combination soft rock and coal masses can provide a bas...
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| Published in | International journal of rock mechanics and mining sciences (Oxford, England : 1997) Vol. 138; p. 104593 |
|---|---|
| Main Authors | , , , |
| Format | Journal Article |
| Language | English |
| Published |
Berlin
Elsevier Ltd
01.02.2021
Elsevier BV |
| Subjects | |
| Online Access | Get full text |
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| Abstract | The coal-measure rock masses of China's Ordos Basin are mainly composed of typical soft rock with low strength, which bear loads together with the coal seams during coal mining activities. Accurately determining the mechanical behaviors of combination soft rock and coal masses can provide a basis for underground coal engineering designs. First, uniaxial compression tests were conducted on medium sandstone samples, coal samples, and coal-rock combination samples. It was observed that the peak axial strain, uniaxial compressive strength, stress-strain curve shape, and elastic modulus of the combination samples were closer to those of the coal samples, indicating that the mechanical characteristics of soft rock-coal combination samples were mainly affected by the coal. Then, using the static equilibrium and deformation continuous conditions, along with the Griffith strength criterion, the ultimate compressive strength of materials at different positions in a combination model was analyzed. The results revealed that the interface constraint effects had reduced the strength of the sandstone near the interface and improved that of the coal near the interface. The interface constraint effects were verified by comparing the generalized Poisson's ratio of materials at different positions with those of the standard coal and sandstone samples. Finally, based on the final failure modes, and the temporal characteristics of the acoustic emission (AE) count rate and peak frequency, the progressive failure mechanism of the soft rock-coal combination samples was studied. This failure process was found to be characterized by the synergistic failure of the material and structure. Furthermore, the effect of coal-rock height ratio on the strength of materials at different positions was discussed, which interpreted the experimental results observed in the previous related studies, namely, with the increase in the rock-coal height ratio, the strength of the combination samples had increased, and the impact tendency had been significantly enhanced. |
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| AbstractList | The coal-measure rock masses of China's Ordos Basin are mainly composed of typical soft rock with low strength, which bear loads together with the coal seams during coal mining activities. Accurately determining the mechanical behaviors of combination soft rock and coal masses can provide a basis for underground coal engineering designs. First, uniaxial compression tests were conducted on medium sandstone samples, coal samples, and coal-rock combination samples. It was observed that the peak axial strain, uniaxial compressive strength, stress-strain curve shape, and elastic modulus of the combination samples were closer to those of the coal samples, indicating that the mechanical characteristics of soft rock-coal combination samples were mainly affected by the coal. Then, using the static equilibrium and deformation continuous conditions, along with the Griffith strength criterion, the ultimate compressive strength of materials at different positions in a combination model was analyzed. The results revealed that the interface constraint effects had reduced the strength of the sandstone near the interface and improved that of the coal near the interface. The interface constraint effects were verified by comparing the generalized Poisson's ratio of materials at different positions with those of the standard coal and sandstone samples. Finally, based on the final failure modes, and the temporal characteristics of the acoustic emission (AE) count rate and peak frequency, the progressive failure mechanism of the soft rock-coal combination samples was studied. This failure process was found to be characterized by the synergistic failure of the material and structure. Furthermore, the effect of coal-rock height ratio on the strength of materials at different positions was discussed, which interpreted the experimental results observed in the previous related studies, namely, with the increase in the rock-coal height ratio, the strength of the combination samples had increased, and the impact tendency had been significantly enhanced. |
| ArticleNumber | 104593 |
| Author | Liu, Haiyan Zuo, Jianping Song, Hongqiang Zuo, Shuhao |
| Author_xml | – sequence: 1 givenname: Hongqiang orcidid: 0000-0002-0578-5586 surname: Song fullname: Song, Hongqiang organization: School of Mechanics and Civil Engineering, China University of Mining and Technology(Beijing), Beijing, 100083, China – sequence: 2 givenname: Jianping surname: Zuo fullname: Zuo, Jianping email: zjp@cumtb.edu.cn organization: School of Mechanics and Civil Engineering, China University of Mining and Technology(Beijing), Beijing, 100083, China – sequence: 3 givenname: Haiyan surname: Liu fullname: Liu, Haiyan organization: School of Mechanics and Civil Engineering, China University of Mining and Technology(Beijing), Beijing, 100083, China – sequence: 4 givenname: Shuhao surname: Zuo fullname: Zuo, Shuhao organization: School of Mechanics and Civil Engineering, China University of Mining and Technology(Beijing), Beijing, 100083, China |
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| Keywords | Progressive failure mechanism Acoustic emission Coal-rock height ratio Strength characteristics Interface effects Soft rock-coal combination samples |
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| Snippet | The coal-measure rock masses of China's Ordos Basin are mainly composed of typical soft rock with low strength, which bear loads together with the coal seams... |
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| SubjectTerms | Acoustic emission Axial strain Axial stress Coal Coal mines Coal mining Coal-rock height ratio Compression Compression tests Compressive properties Compressive strength Failure mechanisms Failure modes Interface effects Mechanical properties Modulus of elasticity Peak frequency Poisson's ratio Progressive failure mechanism Rock masses Rocks Sandstone Soft rock-coal combination samples Static equilibrium Strain Strength characteristics Strength of materials Stress-strain curves |
| Title | The strength characteristics and progressive failure mechanism of soft rock-coal combination samples with consideration given to interface effects |
| URI | https://dx.doi.org/10.1016/j.ijrmms.2020.104593 https://www.proquest.com/docview/2568228207 |
| Volume | 138 |
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