Effects of external dynamic disturbances and structural plane on rock fracturing around deep underground cavern
Abstract The occurrence of disasters in deep mining engineering has been confirmed to be closely related to the external dynamic disturbances and geological discontinuities. Thus, a combined finite-element method was employed to simulate the failure process of an underground cavern, which provided i...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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SpringerOpen
2022-03-01
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| Series: | International Journal of Coal Science & Technology |
| Subjects: | |
| Online Access: | https://doi.org/10.1007/s40789-022-00487-z |
| _version_ | 1818320963431825408 |
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| author | Fan Feng Shaojie Chen Xingdong Zhao Diyuan Li Xianlai Wang Jiqiang Cui |
| author_facet | Fan Feng Shaojie Chen Xingdong Zhao Diyuan Li Xianlai Wang Jiqiang Cui |
| author_sort | Fan Feng |
| collection | DOAJ |
| description | Abstract The occurrence of disasters in deep mining engineering has been confirmed to be closely related to the external dynamic disturbances and geological discontinuities. Thus, a combined finite-element method was employed to simulate the failure process of an underground cavern, which provided insights into the failure mechanism of deep hard rock affected by factors such as the dynamic stress-wave amplitudes, disturbance direction, and dip angles of the structural plane. The crack-propagation process, stress-field distribution, displacement, velocity of failed rock, and failure zone around the circular cavern were analyzed to identify the dynamic response and failure properties of the underground structures. The simulation results indicate that the dynamic disturbance direction had less influence on the dynamic response for the constant in situ stress state, while the failure intensity and damage range around the cavern always exhibited a monotonically increasing trend with an increase in the dynamic load. The crack distribution around the circular cavern exhibited an asymmetric pattern, possibly owing to the stress-wave reflection behavior and attenuation effect along the propagation route. Geological discontinuities significantly affected the stability of nearby caverns subjected to dynamic disturbances, during which the failure intensity exhibited the pattern of an initial increase followed by a decrease with an increase in the dip angle of the structural plane. Additionally, the dynamic disturbance direction led to variations in the crack distribution for specific structural planes and stress states. These results indicate that the failure behavior should be the integrated response of the excavation unloading effect, geological conditions, and external dynamic disturbances. |
| first_indexed | 2024-12-13T10:33:21Z |
| format | Article |
| id | doaj.art-1f3a82e5ffb64434b66a41d6be97b75d |
| institution | Directory Open Access Journal |
| issn | 2095-8293 2198-7823 |
| language | English |
| last_indexed | 2024-12-13T10:33:21Z |
| publishDate | 2022-03-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | International Journal of Coal Science & Technology |
| spelling | doaj.art-1f3a82e5ffb64434b66a41d6be97b75d2022-12-21T23:50:47ZengSpringerOpenInternational Journal of Coal Science & Technology2095-82932198-78232022-03-019112110.1007/s40789-022-00487-zEffects of external dynamic disturbances and structural plane on rock fracturing around deep underground cavernFan Feng0Shaojie Chen1Xingdong Zhao2Diyuan Li3Xianlai Wang4Jiqiang Cui5College of Energy and Mining Engineering, Shandong University of Science and TechnologyCollege of Energy and Mining Engineering, Shandong University of Science and TechnologySchool of Resources and Civil Engineering, Northeastern UniversitySchool of Resources and Safety Engineering, Central South UniversityState Key Laboratory of Nickel and Cobalt Resources Comprehensive UtilizationState Key Laboratory of Nickel and Cobalt Resources Comprehensive UtilizationAbstract The occurrence of disasters in deep mining engineering has been confirmed to be closely related to the external dynamic disturbances and geological discontinuities. Thus, a combined finite-element method was employed to simulate the failure process of an underground cavern, which provided insights into the failure mechanism of deep hard rock affected by factors such as the dynamic stress-wave amplitudes, disturbance direction, and dip angles of the structural plane. The crack-propagation process, stress-field distribution, displacement, velocity of failed rock, and failure zone around the circular cavern were analyzed to identify the dynamic response and failure properties of the underground structures. The simulation results indicate that the dynamic disturbance direction had less influence on the dynamic response for the constant in situ stress state, while the failure intensity and damage range around the cavern always exhibited a monotonically increasing trend with an increase in the dynamic load. The crack distribution around the circular cavern exhibited an asymmetric pattern, possibly owing to the stress-wave reflection behavior and attenuation effect along the propagation route. Geological discontinuities significantly affected the stability of nearby caverns subjected to dynamic disturbances, during which the failure intensity exhibited the pattern of an initial increase followed by a decrease with an increase in the dip angle of the structural plane. Additionally, the dynamic disturbance direction led to variations in the crack distribution for specific structural planes and stress states. These results indicate that the failure behavior should be the integrated response of the excavation unloading effect, geological conditions, and external dynamic disturbances.https://doi.org/10.1007/s40789-022-00487-zUnderground cavernDynamic disturbancesStructural planeCrack propagationFailure intensityExcavation unloading |
| spellingShingle | Fan Feng Shaojie Chen Xingdong Zhao Diyuan Li Xianlai Wang Jiqiang Cui Effects of external dynamic disturbances and structural plane on rock fracturing around deep underground cavern International Journal of Coal Science & Technology Underground cavern Dynamic disturbances Structural plane Crack propagation Failure intensity Excavation unloading |
| title | Effects of external dynamic disturbances and structural plane on rock fracturing around deep underground cavern |
| title_full | Effects of external dynamic disturbances and structural plane on rock fracturing around deep underground cavern |
| title_fullStr | Effects of external dynamic disturbances and structural plane on rock fracturing around deep underground cavern |
| title_full_unstemmed | Effects of external dynamic disturbances and structural plane on rock fracturing around deep underground cavern |
| title_short | Effects of external dynamic disturbances and structural plane on rock fracturing around deep underground cavern |
| title_sort | effects of external dynamic disturbances and structural plane on rock fracturing around deep underground cavern |
| topic | Underground cavern Dynamic disturbances Structural plane Crack propagation Failure intensity Excavation unloading |
| url | https://doi.org/10.1007/s40789-022-00487-z |
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