Coal strength and Young's modulus related to coal rank,compressional velocity and maceral composition |
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| Institution: | 1. School of Resources & Environment, Henan Polytechnic University, Jiaozuo 454000, China;2. Key Lab of Computational Geodynamics, CAS, College of Earth Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;3. College of Geoscience and Surveying Engineering, China University of Mining and Technology, Beijing 100083, China;4. School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454000, China;1. School of Safety Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China;2. National Engineering Research Center for Coal Gas Control, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China;3. The Research Institute of Construction Management and Real Estate, Southeast University, Nanjing, Jiangsu 210096, China;1. State Key Laboratory of Deep Coal Mining and Environment Protection, Huainan 232000, China;2. National Engineering Research Center for Coalmine Gas Control, Huainan 232000, China;1. School of Mines, China University of Mining and Technology, Xuzhou, Jiangsu 221116, PR China;2. State Key Laboratory of Coal Resources and Safe Mining, China University of Mining and Technology, Jiangsu 221116, PR China;3. School of Civil, Mining and Environmental Engineering, University of Wollongong, NSW 2522, Australia;4. School of Resource Environment and Safety Engineering, University of South China, Hengyang 412001, PR China;1. Department of Earth Sciences, Indian Institute of Technology Roorkee, Uttarakhand 247667, India;2. IITB Monash Research Academy, Indian Institute of Technology Bombay, Mumbai 400076, India;3. Deep Earth Energy Laboratory, Department of Civil Engineering, Monash University, Clayton, VIC 3800, Australia;4. Department of Earth Sciences, Indian Institute of Technology Bombay, Mumbai 400076, India |
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| Abstract: | This paper presents an experimental investigation of coal rank and maceral composition influences on the coal mechanical behaviors. The complete stress–strain behavior, uniaxial compressive strength, Young's modulus, and acoustic compressional velocity were measured and correlated to coal ranks and microstructures. The test results show that coal is an elasto-brittle geo-material and its uniaxial compressive strength and Young's modulus increase as coal rank increases. This occurs because as vitrinite reflectance or coal rank increases, coal has less microporous structure and thus higher uniaxial compressive strength. Therefore, using vitrinite reflectance value instead of vitrinite content is advantageous for correlating coal strength. The experimental results also demonstrate that compressive strength and Young's modulus have positive exponential correlation, even for different types of coal. Therefore, the compressive strength of coal is highly related to its Young's modulus. The uniaxial compressive strength and acoustic compressional velocity of coal are also correlated, but a single correlation does not exist for different coal ranks; instead, different relationships occur for different types of coal. |
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| Keywords: | Coal rank Uniaxial compressive strength Young's modulus Compressional velocity Maceral Vitrinite reflectance |
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