Fracture Mechanism in Overlying Strata during Longwall Mining
We used the key stratum theory to establish a more realistic thin-plate mechanical model of elastic foundation clamped boundary and study the fracture mechanism of overlying strata during longwall mining. We analyzed the fracture characteristics and factors affecting fracture of the key stratum comb...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2021-01-01
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| Series: | Shock and Vibration |
| Online Access: | http://dx.doi.org/10.1155/2021/4764732 |
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| author | Zhengyi Ti Jiazhen Li Meng Wang Kang Wang Zhupeng Jin Caiwang Tai |
| author_facet | Zhengyi Ti Jiazhen Li Meng Wang Kang Wang Zhupeng Jin Caiwang Tai |
| author_sort | Zhengyi Ti |
| collection | DOAJ |
| description | We used the key stratum theory to establish a more realistic thin-plate mechanical model of elastic foundation clamped boundary and study the fracture mechanism of overlying strata during longwall mining. We analyzed the fracture characteristics and factors affecting fracture of the key stratum combined with the Mohr–Coulomb yield criterion. Besides, we used numerical simulation methods to verify the evolution pattern of the overlying strata fracture. The results show that the fracture mechanisms of the elastic foundation clamped structure’s key stratum varied depending on the position under longwall mining. The advanced coal wall area of the upper surface is a compressive-shear fracture. The center area of the lower surface is a tensile fracture. With the increase of the excavation length and the load of the key stratum, the central area and the advanced coal wall area of the long side are fractured before the advanced coal wall area of the short side. With the increase of flexural rigidity of the key stratum, the advanced coal wall area of the long side fractures before the central area and the advanced coal wall area of the short side. With the increase of the foundation modulus and the advanced load of the key stratum, the central area fractures before the surrounding advanced coal wall area. The advanced influence distance was positively correlated with the key stratum’s flexural rigidity and advanced load and negatively correlated with the foundation modulus and excavation length. The advanced influence distance was not affected by the load of the key stratum. The numerical simulation results show that, with the increase of the mining area, the fracture trace of overlying strata in goaf extended to the coal wall’s interior. The fracture range of overlying strata is larger than that of the miningd: area. This study has a practical value for water disasters, gas outbursts, and rock strata control. |
| format | Article |
| id | doaj-art-81c8cd8d410048b7bf2362fa65493631 |
| institution | Kabale University |
| issn | 1070-9622 1875-9203 |
| language | English |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Shock and Vibration |
| spelling | doaj-art-81c8cd8d410048b7bf2362fa654936312025-02-03T06:11:59ZengWileyShock and Vibration1070-96221875-92032021-01-01202110.1155/2021/47647324764732Fracture Mechanism in Overlying Strata during Longwall MiningZhengyi Ti0Jiazhen Li1Meng Wang2Kang Wang3Zhupeng Jin4Caiwang Tai5College of Mining Engineering, Liaoning Technical University, Fuxin 123000, ChinaCollege of Mining Engineering, Liaoning Technical University, Fuxin 123000, ChinaCollege of Mining Engineering, Liaoning Technical University, Fuxin 123000, ChinaCollege of Mining Engineering, Liaoning Technical University, Fuxin 123000, ChinaSchool of Mining Engineering, Heilongjiang University of Science and Technology, Harbin 150027, ChinaCollege of Mining Engineering, Liaoning Technical University, Fuxin 123000, ChinaWe used the key stratum theory to establish a more realistic thin-plate mechanical model of elastic foundation clamped boundary and study the fracture mechanism of overlying strata during longwall mining. We analyzed the fracture characteristics and factors affecting fracture of the key stratum combined with the Mohr–Coulomb yield criterion. Besides, we used numerical simulation methods to verify the evolution pattern of the overlying strata fracture. The results show that the fracture mechanisms of the elastic foundation clamped structure’s key stratum varied depending on the position under longwall mining. The advanced coal wall area of the upper surface is a compressive-shear fracture. The center area of the lower surface is a tensile fracture. With the increase of the excavation length and the load of the key stratum, the central area and the advanced coal wall area of the long side are fractured before the advanced coal wall area of the short side. With the increase of flexural rigidity of the key stratum, the advanced coal wall area of the long side fractures before the central area and the advanced coal wall area of the short side. With the increase of the foundation modulus and the advanced load of the key stratum, the central area fractures before the surrounding advanced coal wall area. The advanced influence distance was positively correlated with the key stratum’s flexural rigidity and advanced load and negatively correlated with the foundation modulus and excavation length. The advanced influence distance was not affected by the load of the key stratum. The numerical simulation results show that, with the increase of the mining area, the fracture trace of overlying strata in goaf extended to the coal wall’s interior. The fracture range of overlying strata is larger than that of the miningd: area. This study has a practical value for water disasters, gas outbursts, and rock strata control.http://dx.doi.org/10.1155/2021/4764732 |
| spellingShingle | Zhengyi Ti Jiazhen Li Meng Wang Kang Wang Zhupeng Jin Caiwang Tai Fracture Mechanism in Overlying Strata during Longwall Mining Shock and Vibration |
| title | Fracture Mechanism in Overlying Strata during Longwall Mining |
| title_full | Fracture Mechanism in Overlying Strata during Longwall Mining |
| title_fullStr | Fracture Mechanism in Overlying Strata during Longwall Mining |
| title_full_unstemmed | Fracture Mechanism in Overlying Strata during Longwall Mining |
| title_short | Fracture Mechanism in Overlying Strata during Longwall Mining |
| title_sort | fracture mechanism in overlying strata during longwall mining |
| url | http://dx.doi.org/10.1155/2021/4764732 |
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