Study on Impact Tendency of Coal and Rock Mass Based on Different Stress Paths
With the increased mining depth, the dynamic disaster of rock burst in coal mines has become increasingly prominent, and the impact tendency of coal and rock mass in deep coal seam mining is a necessary condition for the occurrence of rock burst and an important index to measure the failure of coal...
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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/10.1155/2020/8883537 |
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| author | Chengliang Zhang Danyong Ye Ping Yang Shunchuan Wu Chao Wang |
| author_facet | Chengliang Zhang Danyong Ye Ping Yang Shunchuan Wu Chao Wang |
| author_sort | Chengliang Zhang |
| collection | DOAJ |
| description | With the increased mining depth, the dynamic disaster of rock burst in coal mines has become increasingly prominent, and the impact tendency of coal and rock mass in deep coal seam mining is a necessary condition for the occurrence of rock burst and an important index to measure the failure of coal and rock mass. Laboratory tests and numerical tests were used to study the impact tendency of coal and roof strata, including the deformation characteristics, failure characteristics, and bending energy index of the coal and rock mass of different sizes, the failure law and energy evolution characteristics of tlhe coal and rock mass under the same size, and the unloading characteristics of the coal and rock mass under the same size and different confining pressures. The results are shown as follows: (1) The rock roof was determined to have a weak impact tendency through the mechanical test. (2) With the increased size, the microcracks in the rock samples increased correspondingly, and the increased meso-defect leading to the increased heterogeneity was an essential reason for the size effect. The strength of the rock mass decreased with the increased specimen size. The larger the specimen size was, the lower the bending energy index was. (3) Triaxial loading and unloading were tested for the same size under different surrounding rocks. Under the same loading conditions, with the increased confining pressure, the strength and bending energy index of rock mass increased correspondingly, and the failure of rock mass transformed from tensile to shear failure. The failure form and strength characteristic of rock under the unloading condition are different from those under the loading condition. The failure degree was intense, with a high bending energy index. Compared with the loading situation, the impact tendency caused by unloading was higher, and the dynamic impact disaster was more likely to occur. |
| format | Article |
| id | doaj-art-8f9f63a3abaf433c86b1d0e4c42aba41 |
| 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-8f9f63a3abaf433c86b1d0e4c42aba412025-02-03T01:00:20ZengWileyAdvances in Civil Engineering1687-80861687-80942020-01-01202010.1155/2020/88835378883537Study on Impact Tendency of Coal and Rock Mass Based on Different Stress PathsChengliang Zhang0Danyong Ye1Ping Yang2Shunchuan Wu3Chao Wang4Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaFaculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaFaculty of Public Security and Emergency Management, Kunming University of Science and Technology, Kunming 650093, ChinaFaculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaFaculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaWith the increased mining depth, the dynamic disaster of rock burst in coal mines has become increasingly prominent, and the impact tendency of coal and rock mass in deep coal seam mining is a necessary condition for the occurrence of rock burst and an important index to measure the failure of coal and rock mass. Laboratory tests and numerical tests were used to study the impact tendency of coal and roof strata, including the deformation characteristics, failure characteristics, and bending energy index of the coal and rock mass of different sizes, the failure law and energy evolution characteristics of tlhe coal and rock mass under the same size, and the unloading characteristics of the coal and rock mass under the same size and different confining pressures. The results are shown as follows: (1) The rock roof was determined to have a weak impact tendency through the mechanical test. (2) With the increased size, the microcracks in the rock samples increased correspondingly, and the increased meso-defect leading to the increased heterogeneity was an essential reason for the size effect. The strength of the rock mass decreased with the increased specimen size. The larger the specimen size was, the lower the bending energy index was. (3) Triaxial loading and unloading were tested for the same size under different surrounding rocks. Under the same loading conditions, with the increased confining pressure, the strength and bending energy index of rock mass increased correspondingly, and the failure of rock mass transformed from tensile to shear failure. The failure form and strength characteristic of rock under the unloading condition are different from those under the loading condition. The failure degree was intense, with a high bending energy index. Compared with the loading situation, the impact tendency caused by unloading was higher, and the dynamic impact disaster was more likely to occur.http://dx.doi.org/10.1155/2020/8883537 |
| spellingShingle | Chengliang Zhang Danyong Ye Ping Yang Shunchuan Wu Chao Wang Study on Impact Tendency of Coal and Rock Mass Based on Different Stress Paths Advances in Civil Engineering |
| title | Study on Impact Tendency of Coal and Rock Mass Based on Different Stress Paths |
| title_full | Study on Impact Tendency of Coal and Rock Mass Based on Different Stress Paths |
| title_fullStr | Study on Impact Tendency of Coal and Rock Mass Based on Different Stress Paths |
| title_full_unstemmed | Study on Impact Tendency of Coal and Rock Mass Based on Different Stress Paths |
| title_short | Study on Impact Tendency of Coal and Rock Mass Based on Different Stress Paths |
| title_sort | study on impact tendency of coal and rock mass based on different stress paths |
| url | http://dx.doi.org/10.1155/2020/8883537 |
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