Affiliation:
1. State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou, Jiangsu, PR China.
2. School of Mechanics and Civil Engineering, China University of Mining and Technology, Xuzhou, Jiangsu, PR China.
Abstract
The dynamic mechanical behaviours of coal exposed to elevated temperatures are important in mining engineering, especially in underground coal gasification. In this study, anthracite specimens were preheated up to 500°C in an oxygen-free atmosphere. Then, a series of laboratory tests, including mercury intrusion porosimetry, split Hopkinson pressure bar test and scanning electron microscopy, was conducted to investigate the effects of heat treatment on the physical and dynamic mechanical properties of coal. The results show that physical reactivity and pyrolysis have main roles before and after 300°C, respectively. Thus, the properties of coal related with temperature can be divided into two stages: stage 1 and stage 2. The mass-loss ratio, porosity and pore size distribution all vary more acutely in stage 2 than in stage 1. Coal gradually loses its dynamic bearing and anti-deformation capacities with increase in temperature, especially after 300°C.
Subject
Earth and Planetary Sciences (miscellaneous),Geotechnical Engineering and Engineering Geology
Cited by
4 articles.
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