Influence of Heating Rate on the Dynamic Mechanical Performance of Coal Measure Rocks
Publication: International Journal of Geomechanics
Volume 17, Issue 8
Abstract
The aim of this paper is to determine the influence of heating rate on the dynamic mechanical performance of coal measure rocks after heat treatment. Uniaxial compression tests were conducted using a split Hopkinson pressure bar system on coal measure rocks after heat treatment at 800°C at different heating rates. The results reveal that a high-temperature treatment changed the physical and mechanical properties of the sandstone. When the heating rate was increased, the natural and mechanical properties were reduced gradually. The failure mode of sandstone after heat treatment was tension destruction, and shear fracturing occurred locally only at high heating rates. Original cracks grew inside the sandstone after heat treatment, while the number of defects (including cracks and pores) increased gradually with an increased heating rate, which was the main reason for the change in the sandstone’s macromechanical properties. The energy dissipation during fracturing was correlated closely to the fracture characteristics and increased with increased heating rates. The results of this work can provide references for future engineering projects, such as underground coal gasification and coal-bed methane thermal exploitation.
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Acknowledgments
Financial support for this work was provided by the National Basic Research Program of China (Grant 2013CB227900) and the National Science Fund for Excellent Young Scholars (Grant 51322401). The project was also supported by the National Natural Science Foundation (Grants 51227003 and 51304201) and Colleges and Universities in Jiangsu Province Plans to Graduate Research and Innovation (Grant KYLX14_1371).
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Published In
International Journal of Geomechanics
Volume 17 • Issue 8 • August 2017
Copyright
© 2017 American Society of Civil Engineers.
History
Received: Jan 12, 2016
Accepted: Nov 16, 2016
Published online: Feb 15, 2017
Discussion open until: Jul 15, 2017
Published in print: Aug 1, 2017
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