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| BRAZILIAN SPLITTING TESTS ON COAL ROCK CONSIDERING
BEDDING DIRECTION UNDER STATIC AND DYNAMIC LOADING RATE |
| LIU Xiaohui1，2，3，DAI Feng3，LIU Jianfeng3，ZHANG Ru3 |
| (1. Key Laboratory of Fluid and Power Machinery，Ministry of Education，Xihua University，Chengdu，Sichuan 610039，China；2. School of Energy and Power Engineering，Xihua University，Chengdu，Sichuan 610039，China；3. College of Water Resources and Hydropower，Chengdu，Sichuan 610065，China) |
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Abstract In order to investigate the tensile strength and failure characteristics of bedding coal rock under different loading rates，the static and dynamic Brazilian splitting tests were carried out with MTS815 rock mechanical test system and SHPB dynamic test system considering the vertical and parallel bedding directions. The results showed that the tensile strength of coal rock was anisotropic. The tensile strength of parallel bedding coal rock was greater than that of the vertical bedding coal rock. For the parallel bedding coal rock，the fluctuation of the tensile strength was greater with the increasing of loading rate and was significantly scattered. The vertical bedding coal rock had multiple fracturing modes. The strain rate had significant effect on the tensile strength and deformation. The tensile strength and strain rate were related linearly or in power function. The higher the loading rate was，the more severe the coal rock crushed. The composition and structural characteristics of coal rock were the important influence factors for the property discrepancy of coal rock and were the internal causes for the strength and deformation anisotropy of coal rock.
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2015, Vol. 34 
