Experimental Investigation on Deformation and Strength Behavior of Marble with the Complex Loading-Unloading Stress Path
The excavation of deep tunnel in rock mass undergoes complex loading and unloading stress paths, resulting in rib spalling, flaking, and even severe rockburst disasters. Based on the variation law of the stress path of the surrounding rock, laboratory tests of rock mechanics are designed, and the de...
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| Format: | Article |
| Language: | English |
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Wiley
2020-01-01
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| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/2020/8853044 |
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| author | Chen Chen Lipeng Liu Yu Cong |
| author_facet | Chen Chen Lipeng Liu Yu Cong |
| author_sort | Chen Chen |
| collection | DOAJ |
| description | The excavation of deep tunnel in rock mass undergoes complex loading and unloading stress paths, resulting in rib spalling, flaking, and even severe rockburst disasters. Based on the variation law of the stress path of the surrounding rock, laboratory tests of rock mechanics are designed, and the deformation and strength behavior of marble with different initial confining pressure and unloading rates are systematically studied. By introducing strain increment, the characteristic stress, and the dilatancy index, the rock’s dilatancy and brittleness under different unloading conditions are quantitatively analyzed. During unloading, the energy transformation mechanism of rock is described, and the law of deformation and failure is discussed based on characteristic energy. The rock failure strength fitting formula is given by applying the Mogi–Coulomb criterion and elastic strain energy criterion. The advantages of the elastic strain energy criterion are theoretically explained. This study shows that comprehensive consideration of the complex stress paths, confining pressure levels, and the loading-unloading rates of surrounding rock is an effective way to accurately study unloading rock characteristics. The results can provide theoretical basis for stability analysis of high-stress underground engineering. |
| format | Article |
| id | doaj-art-e519824890074512a4c690a1be7015b4 |
| institution | Kabale University |
| issn | 1687-8086 1687-8094 |
| language | English |
| publishDate | 2020-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Civil Engineering |
| spelling | doaj-art-e519824890074512a4c690a1be7015b42025-02-03T01:28:14ZengWileyAdvances in Civil Engineering1687-80861687-80942020-01-01202010.1155/2020/88530448853044Experimental Investigation on Deformation and Strength Behavior of Marble with the Complex Loading-Unloading Stress PathChen Chen0Lipeng Liu1Yu Cong2School of Engineering and Technology, China University of Geosciences (Beijing), Beijing 100083, ChinaState Key Laboratory of Simulation and Regulation of Water Cycle in River Basin China Institute of Water Resources and Hydropower Research, Beijing 100048, ChinaSchool of Civil Engineering, Qingdao University of Technology, Qingdao 266033, ChinaThe excavation of deep tunnel in rock mass undergoes complex loading and unloading stress paths, resulting in rib spalling, flaking, and even severe rockburst disasters. Based on the variation law of the stress path of the surrounding rock, laboratory tests of rock mechanics are designed, and the deformation and strength behavior of marble with different initial confining pressure and unloading rates are systematically studied. By introducing strain increment, the characteristic stress, and the dilatancy index, the rock’s dilatancy and brittleness under different unloading conditions are quantitatively analyzed. During unloading, the energy transformation mechanism of rock is described, and the law of deformation and failure is discussed based on characteristic energy. The rock failure strength fitting formula is given by applying the Mogi–Coulomb criterion and elastic strain energy criterion. The advantages of the elastic strain energy criterion are theoretically explained. This study shows that comprehensive consideration of the complex stress paths, confining pressure levels, and the loading-unloading rates of surrounding rock is an effective way to accurately study unloading rock characteristics. The results can provide theoretical basis for stability analysis of high-stress underground engineering.http://dx.doi.org/10.1155/2020/8853044 |
| spellingShingle | Chen Chen Lipeng Liu Yu Cong Experimental Investigation on Deformation and Strength Behavior of Marble with the Complex Loading-Unloading Stress Path Advances in Civil Engineering |
| title | Experimental Investigation on Deformation and Strength Behavior of Marble with the Complex Loading-Unloading Stress Path |
| title_full | Experimental Investigation on Deformation and Strength Behavior of Marble with the Complex Loading-Unloading Stress Path |
| title_fullStr | Experimental Investigation on Deformation and Strength Behavior of Marble with the Complex Loading-Unloading Stress Path |
| title_full_unstemmed | Experimental Investigation on Deformation and Strength Behavior of Marble with the Complex Loading-Unloading Stress Path |
| title_short | Experimental Investigation on Deformation and Strength Behavior of Marble with the Complex Loading-Unloading Stress Path |
| title_sort | experimental investigation on deformation and strength behavior of marble with the complex loading unloading stress path |
| url | http://dx.doi.org/10.1155/2020/8853044 |
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