Microsimulation Study on Energy Release and Rock Block Ejection Force of Granite under Different Unloading Conditions
Rock burst is one typical dynamic disaster caused by excavation in deep underground engineering. High-stress unloading test is a common research method for rock bursts. Due to the limitation of laboratory test conditions, it is difficult to monitor the energy release and dissipation information duri...
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| Format: | Article |
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Frontiers Media S.A.
2022-06-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2022.909371/full |
| _version_ | 1818255509602435072 |
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| author | Xin-Yuan Wang Yan-Chun Yin Ming-Lu Xing Dong-Dong Zhang Yang Chen En-Chao Wang |
| author_facet | Xin-Yuan Wang Yan-Chun Yin Ming-Lu Xing Dong-Dong Zhang Yang Chen En-Chao Wang |
| author_sort | Xin-Yuan Wang |
| collection | DOAJ |
| description | Rock burst is one typical dynamic disaster caused by excavation in deep underground engineering. High-stress unloading test is a common research method for rock bursts. Due to the limitation of laboratory test conditions, it is difficult to monitor the energy release and dissipation information during rock bursts in the unloading test. But the study of energy evolution law is more helpful to reveal the essential characteristics of rock burst. Therefore, the energy evolution process and ejection failure characteristics of granite after unloading were analyzed through the unloading simulation test in this paper, and the influence of unloading velocity, lateral stress, and axial stress were researched. The microstructure numerical model of the granite was established by using digital image processing technology and PFC2D software, aiming to match the real granite. The energy evolution process of unloading granite can be divided into three stages, namely the whole energy rapid release stage, sidewall energy slow-release stage, and rock block ejection stage. The area near the unloading sidewall is the main energy release and rock block ejection area. In the whole energy rapid release stage, the energy release velocity and dissipation velocity show similar law, i.e., a positive power function correlation with unloading velocity, a negative power function correlation with lateral stress, and a positive linear function correlation with axial stress. In the rock block ejection stage, with increasing the unloading velocity and axial stress, the rock block ejection force increases as a power function, while it decreases with increasing lateral stress. This research is an important supplement to the laboratory unloading test. It has theoretical guiding significance for rock burst hazard assessment during excavation in deep underground engineering. |
| first_indexed | 2024-12-12T17:13:00Z |
| format | Article |
| id | doaj.art-eae1d030e5c548f78032ae8a7062c5e9 |
| institution | Directory Open Access Journal |
| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-12-12T17:13:00Z |
| publishDate | 2022-06-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj.art-eae1d030e5c548f78032ae8a7062c5e92022-12-22T00:17:51ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632022-06-011010.3389/feart.2022.909371909371Microsimulation Study on Energy Release and Rock Block Ejection Force of Granite under Different Unloading ConditionsXin-Yuan Wang0Yan-Chun Yin1Ming-Lu Xing2Dong-Dong Zhang3Yang Chen4En-Chao Wang5College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao, ChinaCollege of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao, ChinaCollege of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao, ChinaShandong Energy Group Co., Ltd., Jinan Shandong, ChinaShandong Energy Group Co., Ltd., Jinan Shandong, ChinaJining Energy Bureau, Jining Shandong, ChinaRock burst is one typical dynamic disaster caused by excavation in deep underground engineering. High-stress unloading test is a common research method for rock bursts. Due to the limitation of laboratory test conditions, it is difficult to monitor the energy release and dissipation information during rock bursts in the unloading test. But the study of energy evolution law is more helpful to reveal the essential characteristics of rock burst. Therefore, the energy evolution process and ejection failure characteristics of granite after unloading were analyzed through the unloading simulation test in this paper, and the influence of unloading velocity, lateral stress, and axial stress were researched. The microstructure numerical model of the granite was established by using digital image processing technology and PFC2D software, aiming to match the real granite. The energy evolution process of unloading granite can be divided into three stages, namely the whole energy rapid release stage, sidewall energy slow-release stage, and rock block ejection stage. The area near the unloading sidewall is the main energy release and rock block ejection area. In the whole energy rapid release stage, the energy release velocity and dissipation velocity show similar law, i.e., a positive power function correlation with unloading velocity, a negative power function correlation with lateral stress, and a positive linear function correlation with axial stress. In the rock block ejection stage, with increasing the unloading velocity and axial stress, the rock block ejection force increases as a power function, while it decreases with increasing lateral stress. This research is an important supplement to the laboratory unloading test. It has theoretical guiding significance for rock burst hazard assessment during excavation in deep underground engineering.https://www.frontiersin.org/articles/10.3389/feart.2022.909371/fullrock burstmicrosimulationenergy evolutionenergy release lawrock block ejection characteristics |
| spellingShingle | Xin-Yuan Wang Yan-Chun Yin Ming-Lu Xing Dong-Dong Zhang Yang Chen En-Chao Wang Microsimulation Study on Energy Release and Rock Block Ejection Force of Granite under Different Unloading Conditions Frontiers in Earth Science rock burst microsimulation energy evolution energy release law rock block ejection characteristics |
| title | Microsimulation Study on Energy Release and Rock Block Ejection Force of Granite under Different Unloading Conditions |
| title_full | Microsimulation Study on Energy Release and Rock Block Ejection Force of Granite under Different Unloading Conditions |
| title_fullStr | Microsimulation Study on Energy Release and Rock Block Ejection Force of Granite under Different Unloading Conditions |
| title_full_unstemmed | Microsimulation Study on Energy Release and Rock Block Ejection Force of Granite under Different Unloading Conditions |
| title_short | Microsimulation Study on Energy Release and Rock Block Ejection Force of Granite under Different Unloading Conditions |
| title_sort | microsimulation study on energy release and rock block ejection force of granite under different unloading conditions |
| topic | rock burst microsimulation energy evolution energy release law rock block ejection characteristics |
| url | https://www.frontiersin.org/articles/10.3389/feart.2022.909371/full |
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