Fractal characterization for the mining crack evolution process of overlying strata based on microseismic monitoring technology |
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| Affiliation: | 1. College of Mineral 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. State Key Laboratory of Deep Coal Mining & Environment Protection, Huainan 710054, China;1. Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines, Northeastern University, Shenyang 110819, China;2. Northern Engineering & Technology Corporation, MCC, Dalian 116000, China;3. China Nonferrous Metal Group, Fushun Hongtoushan Mining Co. Ltd., Fushun 113000, China;1. State Key Laboratory of Coal Mining and Clean Utilization, China Coal Research Institute, Beijing, China;2. Mining & Designing Branch, China Coal Research Institute, Beijing, China;1. School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China;2. State Key Laboratory of High-Efficient Mining and Safety of Metal Mines of Ministry of Education, Beijing 100083, China;3. Zhenjiang Institute of Geology for Mineral Resources, Zhenjiang 212003, China;4. Chengchao Iron Mine, Wuhan Iron & Steel Group Minerals Co. Ltd., Wuhan 430080, China |
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| Abstract: | In order to study the evolution laws during the development process of the coal face overburden rock mining-induced fissure, we studied the process of evolution of overburden rock mining-induced fissures and dynamically quantitatively described its fractal laws, based on the high-precision microseismic monitoring method and the nonlinear Fractal Geometry Theory. The results show that: the overburden rock mining-induced fissure fractal dimension experiences two periodic change processes with the coal face advance, namely a Small → Big → Small process, which tends to be stable; the functional relationship between the extraction step distance and the overburden rock mining-induced fissure fractal dimension is a cubic curve. The results suggest that the fractal dimension reflects the evolution characteristics of the overburden rock mining-induced fissure, which can be used as an evaluation index of the stability of the overburden rock strata, and it provides theoretical guidance for stability analysis of the overburden rock strata, goaf roof control and the support movements in the mining face. |
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| Keywords: | Microseismic monitoring technology Fractal characterization Mining crack Evolution law Overlying strata |
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