Research on formation mechanism of the mining-induced horizontal fractures in rock strata separation in the Jurassic coalfield, Huang long, Shaanxi, China
To analyze the mining-induced mechanism of the horizontal fractures due to bed separation in Jurassic coalfield, China, the mineral composition identification test, triaxial compression tests, and overburden response were performed in this study. The mineral composition of rocks is composed of terri...
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Elsevier
2022-11-01
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| Series: | Energy Reports |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2352484722013828 |
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| author | Luyuan Wu Jianwei Zhang Zifa Wang Dan Ma Guangjin Wang |
| author_facet | Luyuan Wu Jianwei Zhang Zifa Wang Dan Ma Guangjin Wang |
| author_sort | Luyuan Wu |
| collection | DOAJ |
| description | To analyze the mining-induced mechanism of the horizontal fractures due to bed separation in Jurassic coalfield, China, the mineral composition identification test, triaxial compression tests, and overburden response were performed in this study. The mineral composition of rocks is composed of terrigenous sand (cuttings, quartz, and feldspar), terrigenous silt, clay, and a few interstitial materials in adjacent rock strata. The differences of mineral compositions are proved to be the essential factors through triaxial compression tests on rock samples, which found that the strength, Young’s modulus, Poisson’s ratio, and plasticity of adjacent have great differences in rock samples. For predicting the variation of the horizontal fractures, the overburden is supposed to be a thin cube plate. And the range of sizes is corresponding to the scope of the extracted coal seam. Then, based on the elasticity thin plate theory, w(x, y)=C0(1+cos(xπ/a)) (1+cos(yπ/a)) is proposed as the deflection function and the stress and deformation of rock strata are obtained by the variational method and minimum potential energy principle. Hence, a mathematical model suitable is proposed to analyze the variation of the horizontal fractures. The Yuanzigou coal mine is taken as an example, the theoretical results are verified by an exploration borehole video imager. In conclusion, the distribution characteristics of rock strata and the differences in these physical parameters are the essential factors causing horizontal fracture between adjacent rock strata. Besides, the relationship between horizontal fractures and roof water inrush was also discussed in this study. |
| first_indexed | 2024-04-10T09:10:03Z |
| format | Article |
| id | doaj.art-8c4ad94715cf4c9098b27906c57cf9b1 |
| institution | Directory Open Access Journal |
| issn | 2352-4847 |
| language | English |
| last_indexed | 2024-04-10T09:10:03Z |
| publishDate | 2022-11-01 |
| publisher | Elsevier |
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| series | Energy Reports |
| spelling | doaj.art-8c4ad94715cf4c9098b27906c57cf9b12023-02-21T05:12:33ZengElsevierEnergy Reports2352-48472022-11-01897119723Research on formation mechanism of the mining-induced horizontal fractures in rock strata separation in the Jurassic coalfield, Huang long, Shaanxi, ChinaLuyuan Wu0Jianwei Zhang1Zifa Wang2Dan Ma3Guangjin Wang4School of civil engineering and architecture, Henan University, Kaifeng 475001, Henan, China; Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, Harbin, Heilongjiang 150080, ChinaSchool of civil engineering and architecture, Henan University, Kaifeng 475001, Henan, China; Corresponding authors.Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, Harbin, Heilongjiang 150080, China; CEAKJ ADPRHexa, Inc., Shaoguan 512000, Guangdong, China; Corresponding authors.State Key Laboratory of Coal Resources & Safe Mining, School of Mines, China University of Mining & Technology, Xuzhou 221116, Jiangsu, China; Corresponding authors.Faculty of Land Resources Engineering, Kunming University of Science and Technology, Kunming 650093, China; Corresponding authors.To analyze the mining-induced mechanism of the horizontal fractures due to bed separation in Jurassic coalfield, China, the mineral composition identification test, triaxial compression tests, and overburden response were performed in this study. The mineral composition of rocks is composed of terrigenous sand (cuttings, quartz, and feldspar), terrigenous silt, clay, and a few interstitial materials in adjacent rock strata. The differences of mineral compositions are proved to be the essential factors through triaxial compression tests on rock samples, which found that the strength, Young’s modulus, Poisson’s ratio, and plasticity of adjacent have great differences in rock samples. For predicting the variation of the horizontal fractures, the overburden is supposed to be a thin cube plate. And the range of sizes is corresponding to the scope of the extracted coal seam. Then, based on the elasticity thin plate theory, w(x, y)=C0(1+cos(xπ/a)) (1+cos(yπ/a)) is proposed as the deflection function and the stress and deformation of rock strata are obtained by the variational method and minimum potential energy principle. Hence, a mathematical model suitable is proposed to analyze the variation of the horizontal fractures. The Yuanzigou coal mine is taken as an example, the theoretical results are verified by an exploration borehole video imager. In conclusion, the distribution characteristics of rock strata and the differences in these physical parameters are the essential factors causing horizontal fracture between adjacent rock strata. Besides, the relationship between horizontal fractures and roof water inrush was also discussed in this study.http://www.sciencedirect.com/science/article/pii/S2352484722013828Horizontal fractureRock strata separationWater inrushMiningElasticity plate theory |
| spellingShingle | Luyuan Wu Jianwei Zhang Zifa Wang Dan Ma Guangjin Wang Research on formation mechanism of the mining-induced horizontal fractures in rock strata separation in the Jurassic coalfield, Huang long, Shaanxi, China Energy Reports Horizontal fracture Rock strata separation Water inrush Mining Elasticity plate theory |
| title | Research on formation mechanism of the mining-induced horizontal fractures in rock strata separation in the Jurassic coalfield, Huang long, Shaanxi, China |
| title_full | Research on formation mechanism of the mining-induced horizontal fractures in rock strata separation in the Jurassic coalfield, Huang long, Shaanxi, China |
| title_fullStr | Research on formation mechanism of the mining-induced horizontal fractures in rock strata separation in the Jurassic coalfield, Huang long, Shaanxi, China |
| title_full_unstemmed | Research on formation mechanism of the mining-induced horizontal fractures in rock strata separation in the Jurassic coalfield, Huang long, Shaanxi, China |
| title_short | Research on formation mechanism of the mining-induced horizontal fractures in rock strata separation in the Jurassic coalfield, Huang long, Shaanxi, China |
| title_sort | research on formation mechanism of the mining induced horizontal fractures in rock strata separation in the jurassic coalfield huang long shaanxi china |
| topic | Horizontal fracture Rock strata separation Water inrush Mining Elasticity plate theory |
| url | http://www.sciencedirect.com/science/article/pii/S2352484722013828 |
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