Mining stress formation and distribution: Predictive model based on overburden key strata structure
Abstract In coal mines, the effective extraction of relief gas and the prevention of dynamic disasters depend on accurate predictions of the spatial distribution of mining stress in the overlying rock. However, at present, the prediction of stress relief and concentration zones based on operational...
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| Format: | Article |
| Language: | English |
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Wiley
2024-04-01
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| Series: | Energy Science & Engineering |
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| Online Access: | https://doi.org/10.1002/ese3.1686 |
| _version_ | 1797202882473230336 |
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| author | Hongkai Han Zhengquan Hu Yanwei Liu Weiqin Zuo Xiaozhen Wang Can Shi Yanyan He Yuchun Qi |
| author_facet | Hongkai Han Zhengquan Hu Yanwei Liu Weiqin Zuo Xiaozhen Wang Can Shi Yanyan He Yuchun Qi |
| author_sort | Hongkai Han |
| collection | DOAJ |
| description | Abstract In coal mines, the effective extraction of relief gas and the prevention of dynamic disasters depend on accurate predictions of the spatial distribution of mining stress in the overlying rock. However, at present, the prediction of stress relief and concentration zones based on operational experience or empirical modeling differs significantly from actual measurements in the field. The fundamental problem is the difficulty in modeling the transfer mechanism of the mining overburden load under the influence of key strata. In this study, a mechanical model of the spatial distribution of the mining stress field based on the structure of overburden key strata was established. The model demonstrates that the key strata are the main bearing bodies of the overlying rock, both before and after the fracture, and the overburden rock load can be transferred to the coal and rock mass around the stope through the key strata in the fracture and bending subsidence zones, thus forming a mining stress field. Equations for calculating the plane distributions of mining stress under the key strata at different horizons and abutment pressures on the stope were established, and a spatial distribution prediction method for the mining stress field based on the overburden key strata structure was proposed. The study area was the Gaojiapu Coal Mine, where it was found that the key stratum of the 400.45 m thick Luohe Formation sandstone bore most of the overlying rock load and transferred the load to the coal and rock mass around the stope. This load distribution is the root cause of a high concentration and wide influence range of mining stresses, leading to serious deformation of the main roadway and frequent dynamic disasters. The mining stress concentration was maximized at a mining length of 1458 m × 1458 m. |
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| format | Article |
| id | doaj.art-5375528ea52a4f30ba06d7b19b175d44 |
| institution | Directory Open Access Journal |
| issn | 2050-0505 |
| language | English |
| last_indexed | 2024-04-24T08:10:30Z |
| publishDate | 2024-04-01 |
| publisher | Wiley |
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| series | Energy Science & Engineering |
| spelling | doaj.art-5375528ea52a4f30ba06d7b19b175d442024-04-17T05:33:22ZengWileyEnergy Science & Engineering2050-05052024-04-011241551156810.1002/ese3.1686Mining stress formation and distribution: Predictive model based on overburden key strata structureHongkai Han0Zhengquan Hu1Yanwei Liu2Weiqin Zuo3Xiaozhen Wang4Can Shi5Yanyan He6Yuchun Qi7School of Safety Science and Engineering Henan Polytechnic University Jiaozuo Henan ChinaSchool of Safety Science and Engineering Henan Polytechnic University Jiaozuo Henan ChinaSchool of Safety Science and Engineering Henan Polytechnic University Jiaozuo Henan ChinaSchool of Safety Science and Engineering Henan Polytechnic University Jiaozuo Henan ChinaSchool of Mines China University of Mining and Technology Xuzhou Jiangsu ChinaSchool of Safety Science and Engineering Henan Polytechnic University Jiaozuo Henan ChinaSchool of Safety Science and Engineering Henan Polytechnic University Jiaozuo Henan ChinaSchool of Safety Science and Engineering Henan Polytechnic University Jiaozuo Henan ChinaAbstract In coal mines, the effective extraction of relief gas and the prevention of dynamic disasters depend on accurate predictions of the spatial distribution of mining stress in the overlying rock. However, at present, the prediction of stress relief and concentration zones based on operational experience or empirical modeling differs significantly from actual measurements in the field. The fundamental problem is the difficulty in modeling the transfer mechanism of the mining overburden load under the influence of key strata. In this study, a mechanical model of the spatial distribution of the mining stress field based on the structure of overburden key strata was established. The model demonstrates that the key strata are the main bearing bodies of the overlying rock, both before and after the fracture, and the overburden rock load can be transferred to the coal and rock mass around the stope through the key strata in the fracture and bending subsidence zones, thus forming a mining stress field. Equations for calculating the plane distributions of mining stress under the key strata at different horizons and abutment pressures on the stope were established, and a spatial distribution prediction method for the mining stress field based on the overburden key strata structure was proposed. The study area was the Gaojiapu Coal Mine, where it was found that the key stratum of the 400.45 m thick Luohe Formation sandstone bore most of the overlying rock load and transferred the load to the coal and rock mass around the stope. This load distribution is the root cause of a high concentration and wide influence range of mining stresses, leading to serious deformation of the main roadway and frequent dynamic disasters. The mining stress concentration was maximized at a mining length of 1458 m × 1458 m.https://doi.org/10.1002/ese3.1686abutment pressuredynamic disasterkey stratamining stress fieldoverburden structure |
| spellingShingle | Hongkai Han Zhengquan Hu Yanwei Liu Weiqin Zuo Xiaozhen Wang Can Shi Yanyan He Yuchun Qi Mining stress formation and distribution: Predictive model based on overburden key strata structure Energy Science & Engineering abutment pressure dynamic disaster key strata mining stress field overburden structure |
| title | Mining stress formation and distribution: Predictive model based on overburden key strata structure |
| title_full | Mining stress formation and distribution: Predictive model based on overburden key strata structure |
| title_fullStr | Mining stress formation and distribution: Predictive model based on overburden key strata structure |
| title_full_unstemmed | Mining stress formation and distribution: Predictive model based on overburden key strata structure |
| title_short | Mining stress formation and distribution: Predictive model based on overburden key strata structure |
| title_sort | mining stress formation and distribution predictive model based on overburden key strata structure |
| topic | abutment pressure dynamic disaster key strata mining stress field overburden structure |
| url | https://doi.org/10.1002/ese3.1686 |
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