Experimental Investigations on Creep Behavior of Coal under Combined Compression and Shear Loading
The creep behavior of rock has received much attention for analyzing the long-term response and stability of underground rock engineering structures. Numerous studies have been carried out on the creep properties of various rocks under pure compression conditions. However, little attention has been...
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| Format: | Article |
| Language: | English |
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Wiley
2021-01-01
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| Series: | Geofluids |
| Online Access: | http://dx.doi.org/10.1155/2021/9965228 |
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| author | Rongbin Hou Leige Xu Duoxin Zhang Yanke Shi Luyang Shi |
| author_facet | Rongbin Hou Leige Xu Duoxin Zhang Yanke Shi Luyang Shi |
| author_sort | Rongbin Hou |
| collection | DOAJ |
| description | The creep behavior of rock has received much attention for analyzing the long-term response and stability of underground rock engineering structures. Numerous studies have been carried out on the creep properties of various rocks under pure compression conditions. However, little attention has been paid to the creep behavior of rocks in a combined compression-shear loading state. In this work, a novel combined compression and shear test (C-CAST) system was used to carry out inclined uniaxial compression tests and creep tests for various inclination angles (0°, 5°, 10°, and 15°). The results revealed that the peak strength of the coal decreased with the inclination angle of the specimen, which could provide the basis for setting up a creep test scheme. Multistage compression-shear creep tests were carried out on specimens with different inclination angles. Based on the analysis of the creep test data, the creep behavior of the coal in a combined compression-shear state was studied. It was found that the specimen inclination affected the time-dependent deformation, long-term strength (LTS), and time to failure. Compared with the specimen under pure compression, the inclination specimens tend to produce large shear strain with time, while they were more prone to shear failure. The reduction of the long-term strength was closely associated with the increase of the specimen inclination angle when the angle was more than 5°. Moreover, the ratio of the peak strength to the LTS was not affected by the specimen inclination, which is considered an inherent characteristic. We anticipate that the results obtained will assist in pillar design and long-term stability analysis. |
| format | Article |
| id | doaj-art-47b2e11455a24688b70f3b94ec8f7052 |
| institution | Kabale University |
| issn | 1468-8115 1468-8123 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geofluids |
| spelling | doaj-art-47b2e11455a24688b70f3b94ec8f70522025-02-03T06:10:46ZengWileyGeofluids1468-81151468-81232021-01-01202110.1155/2021/99652289965228Experimental Investigations on Creep Behavior of Coal under Combined Compression and Shear LoadingRongbin Hou0Leige Xu1Duoxin Zhang2Yanke Shi3Luyang Shi4School of Civil Engineering and Communication, North China University of Water Resources and Electric Power, Zhengzhou, 450045 Henan, ChinaSchool of Civil Engineering and Communication, North China University of Water Resources and Electric Power, Zhengzhou, 450045 Henan, ChinaSchool of Civil Engineering and Communication, North China University of Water Resources and Electric Power, Zhengzhou, 450045 Henan, ChinaSchool of Civil Engineering and Communication, North China University of Water Resources and Electric Power, Zhengzhou, 450045 Henan, ChinaSchool of Civil Engineering and Communication, North China University of Water Resources and Electric Power, Zhengzhou, 450045 Henan, ChinaThe creep behavior of rock has received much attention for analyzing the long-term response and stability of underground rock engineering structures. Numerous studies have been carried out on the creep properties of various rocks under pure compression conditions. However, little attention has been paid to the creep behavior of rocks in a combined compression-shear loading state. In this work, a novel combined compression and shear test (C-CAST) system was used to carry out inclined uniaxial compression tests and creep tests for various inclination angles (0°, 5°, 10°, and 15°). The results revealed that the peak strength of the coal decreased with the inclination angle of the specimen, which could provide the basis for setting up a creep test scheme. Multistage compression-shear creep tests were carried out on specimens with different inclination angles. Based on the analysis of the creep test data, the creep behavior of the coal in a combined compression-shear state was studied. It was found that the specimen inclination affected the time-dependent deformation, long-term strength (LTS), and time to failure. Compared with the specimen under pure compression, the inclination specimens tend to produce large shear strain with time, while they were more prone to shear failure. The reduction of the long-term strength was closely associated with the increase of the specimen inclination angle when the angle was more than 5°. Moreover, the ratio of the peak strength to the LTS was not affected by the specimen inclination, which is considered an inherent characteristic. We anticipate that the results obtained will assist in pillar design and long-term stability analysis.http://dx.doi.org/10.1155/2021/9965228 |
| spellingShingle | Rongbin Hou Leige Xu Duoxin Zhang Yanke Shi Luyang Shi Experimental Investigations on Creep Behavior of Coal under Combined Compression and Shear Loading Geofluids |
| title | Experimental Investigations on Creep Behavior of Coal under Combined Compression and Shear Loading |
| title_full | Experimental Investigations on Creep Behavior of Coal under Combined Compression and Shear Loading |
| title_fullStr | Experimental Investigations on Creep Behavior of Coal under Combined Compression and Shear Loading |
| title_full_unstemmed | Experimental Investigations on Creep Behavior of Coal under Combined Compression and Shear Loading |
| title_short | Experimental Investigations on Creep Behavior of Coal under Combined Compression and Shear Loading |
| title_sort | experimental investigations on creep behavior of coal under combined compression and shear loading |
| url | http://dx.doi.org/10.1155/2021/9965228 |
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