Analysis of stability of support and surrounding rock in mining top coal of inclined coal seam |
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| Affiliation: | 1. College of Geosciences and Surveying Engineering, China University of Mining and Technology (Beijing), Beijing 100083, PR China;2. Key Laboratory of Geological Hazards on Three Gorges Reservoir Area, Ministry of Education, China Three Gorges University, Yichang, Hubei 443002, PR China;3. Faculty of Earth Resources, China University of Geosciences, Wuhan, Hubei 430074, PR China;4. Key Laboratory of Tectonics and Petroleum Resources, Ministry of Education, China University of Geosciences, Wuhan 430074, PR China |
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| Abstract: | The study analyzes the characteristics of roof movement in mining top coal of inclined coal seam, and establishes the mechanical model of support and surrounding-rock stability in inclined coal seam. Besides, this study carries out the numerical calculation and field observation of roof movement and support stability, and provides the critical control measures. The results show that the fracture firstly appears in middle-upper roof and extends upwards in top coal caving in inclined coal seam; regular and irregular caving zones appear in middle-upper stress concentration region, and the asymmetric caving arch is finally formed. Support load of middle-upper working face is larger than that of the middle-lower face; dynamic load coefficient of upper support is large, and the load on the front of support is larger than that on the rear of it, which leads to poor support stability. Stability of support and surrounding-rock system depends mainly on upper-support stability. |
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| Keywords: | Inclined coal seam Roof movement Mechanical model Stability |
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