Journal
INTERNATIONAL JOURNAL OF MINING SCIENCE AND TECHNOLOGY
Volume 30, Issue 5, Pages 643-650Publisher
ELSEVIER
DOI: 10.1016/j.ijmst.2020.05.021
Keywords
High temperature; Coal; Microstructure; Mechanical behavior; Nuclear magnetic resonance
Categories
Funding
- Natural Science Research Project of the Education Department of Henan Province [2010A44002]
- National Natural Science Foundation of China [51904101]
- Open Research Fund Program of Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring (Central South University), Ministry of Education [2017YSJS14]
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Coal is a common porous sedimentary rock whose microstructure and mechanical behavior are often affected by high temperature. In order to deeply investigate the effect of high temperature on the structure and mechanical properties of coal, six groups of coal samples with different heating temperatures were prepared. Various testing methods, including ultrasonic test, scanning electron microscopy, nuclear magnetic resonance and uniaxial compression test, were used in this study. The results showed that the physical and chemical change processes of coal samples under high temperature can be divided into two stages: the stage of drying and degassing and the stage of pyrolysis of the coal matrix. With the increase of heating temperature, the total porosity of coal samples increases, while the integrity and the deformation resistance of coal samples decrease. In addition, the elastic modulus and uniaxial compressive strength of the coal sample decrease with the increase of heating temperature. The Poisson's ratio decreases firstly and then increases with the increase of heating temperature. (C) 2020 Published by Elsevier B.V. on behalf of China University of Mining & Technology.
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