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| Experimental study on static and dynamic mechanical properties of anthracite after high temperature heating |
| YU Liyuan1，LI Guanglei1，2，SU Haijian1，JING Hongwen1，ZHANG Tao1，2 |
| (1. State Key Laboratory for Geomechanics and Deep Underground Engineering，China University of Mining and Technology，Xuzhou，Jiangsu 221116，China；2. School of Mechanics and Civil Engineering，China University of Mining and Technology，Xuzhou，Jiangsu 221116，China) |
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Abstract In order to investigate the mechanical properties of coal after thermal treatment， two sets of anthracite samples with different aspect ratios in a box-type muffle furnace were firstly prepared and heated subsequently under temperatures from 20 ℃ to 500 ℃. The static uniaxial compression and dynamic impact tests were then conducted using the hydraulic servo testing machine and split Hopkinson pressure bar(SHPB) system respectively. The microstructure images，the porosity and the pore size distribution of typical samples were obtained using the scanning electron microscope(SEM) and mercury intrusion porosimetry(MIP). The experimental results show that the temperature range can be divided into two stages by a critical value of 300 ℃. The physical reactivity and pyrolysis play the main roles in Stages 1 and 2 respectively. The porosity of coal and the proportion of super micropores and micropores increase gradually with temperature. The bearing and anti-deformation capacities of anthracite decrease with temperature，and the tendency is more obvious in stage 2 than in Stage 1. The static and dynamic compressive strengthes at 500 ℃ are only 8.41%/16.94% of those in the natural state. The static mechanical properties are more sensitive to the temperature than the dynamic properties due to the effect of strain rate. The variations in dynamic increasing factors of the compressive strength and elastic modulus are different.
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2017, Vol. 36 
