TY - JOUR
T1 - Effects of bedding on the dynamic indirect tensile strength of coal
T2 - Laboratory experiments and numerical simulation
AU - Zhao, Yixin
AU - Zhao, Gao Feng
AU - Jiang, Yaodong
AU - Elsworth, Derek
AU - Huang, Yaqiong
N1 - Funding Information:
This research is supported by the Major State Basic Research Development Program Fund (Nos. 2010CB226804 , 2010CB226801 ), National Natural Science Foundation of China (No. 51174213 ), Australian Research Council (No. DE130100457 ), State Key Lab of Coal Resources and Safe Mining (No. SKLCRSM11KFA02 ), New Century Excellent Talents in the Ministry of Education Support Program of China (No. NCET-10-0775 ), Fundamental Research Funds for the Central Universities and Fund of the China Scholarship Council . The authors specially thank Messrs. Xiao Han, Zhou Kun, Tian Zhongsheng, Han Chao and Han Jingli for their help in the experiments.
PY - 2014/10/1
Y1 - 2014/10/1
N2 - Dynamic indirect tensile tests were carried out by using a Split Hopkinson Pressure Bar (SHPB) for coal sampled from the Datong mine in China. The principal purpose was to explore the influence of bedding structure in the coal on its dynamic indirect tensile strength. However, to resolve some contradictions, X-ray micro CT, high speed optical imaging and a discrete element based modelling approach were combined to analyze the test results. The X-ray micro CT was used to detect the actual bedding structure in the coal; the high speed imaging captured failure patterns of the specimens with different bedding directions; and the numerical modelling was utilized to investigate the influence of different bedding structures on dynamic strength. The SHPB and numerical results illustrate that dynamic indirect tensile strength reliably correlates with impact velocity. In addition, the dynamic indirect tensile strength is not only influenced by the bedding direction but also by the roughness and discontinuity of the bedding. Based on these findings, a method is developed to further process the test data including a model to describe the dynamic indirect tensile strength of Datong coal.
AB - Dynamic indirect tensile tests were carried out by using a Split Hopkinson Pressure Bar (SHPB) for coal sampled from the Datong mine in China. The principal purpose was to explore the influence of bedding structure in the coal on its dynamic indirect tensile strength. However, to resolve some contradictions, X-ray micro CT, high speed optical imaging and a discrete element based modelling approach were combined to analyze the test results. The X-ray micro CT was used to detect the actual bedding structure in the coal; the high speed imaging captured failure patterns of the specimens with different bedding directions; and the numerical modelling was utilized to investigate the influence of different bedding structures on dynamic strength. The SHPB and numerical results illustrate that dynamic indirect tensile strength reliably correlates with impact velocity. In addition, the dynamic indirect tensile strength is not only influenced by the bedding direction but also by the roughness and discontinuity of the bedding. Based on these findings, a method is developed to further process the test data including a model to describe the dynamic indirect tensile strength of Datong coal.
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U2 - 10.1016/j.coal.2014.08.007
DO - 10.1016/j.coal.2014.08.007
M3 - Article
AN - SCOPUS:84906812490
SN - 0166-5162
VL - 132
SP - 81
EP - 93
JO - International Journal of Coal Geology
JF - International Journal of Coal Geology
ER -