Coupling control on pillar stress concentration and surface cracks in shallow multi-seam mining |
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| Affiliation: | 1. College of Energy Engineering, Xi’an University of Science and Technology, Xi’an 710054, China;2. Key Laboratory of Western Mine Exploitation and Hazard Prevention, Ministry of Education, Xi’an 710054, China;3. College of Materials Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China |
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| Abstract: | In order to ensure safe mining and reduce surface damage in shallow multi-seam mining, the failure characteristics of interburden strata with different coal pillars offset distances between pillars in the upper and lower seams, the distribution characteristics of stress concentration in coal pillars, and the development characteristics of stratum cracks and subsidence were investigated by physical and UDEC2 D simulation. Meanwhile, the effect of different coal pillar offset distances on stress concentration of coal pillar and development of stratum cracks were studied. Based on those results, a formula for safe mining and reducing surface damage was established, which provided a theoretical basis for safe and environmentally friendly mining in shallow multi-seam. According to the results, the optimal coal pillar offset distance(the side to side horizontal distance of the upper and lower coal pillars) between the upper and lower coal seams was developed to reduce the stress concentration of coal pillars and surface damage.The results of this study have been applied in Ningtiaota coal mine and have achieved good results in safe and environmentally friendly mining. |
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| Keywords: | Shallow multi-seam Coal pillar offset Stress concentration Surface cracks Strata control |
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