The Influence of Loading Rate on Accumulated Energy Distribution in Coal-Rock Samples and Their Failure Behavior
Guangbo Chen1, Jing Zhang1, Youjun Xu2,3, Tan Li1, Eryu Wang1, Guohua Zhang4
1School of Mining and Coal, Inner Mongolia University of Science and Technology, Baotou, China
2College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao, China
3School of Civil Engineering, Inner Mongolia University of Science and Technology, Baotou, China
4School of Mining Engineering, Heilongjiang University of Science and Technology, Harbin, China
Keywords: Mining engineering, coal-rock system, combined coal-rock body, adhesives, physical property analysis, brittle failure, material defect, impact tendency evaluation index
Abstract
The difference in energy accumulation in coal and rock under the same stress level is analyzed, and it is found that the difference of energy accumulation of coal rock under the same stress level mainly depends on the elastic modulus of coal rock material. Based on the structural characteristics and mechanical properties of coal-rock, the mechanical model of combined coal-rock body was constructed and analyzed, and the calculation formula of partition energy storage of combined coal-rock body was deduced. The axial compression test of combined coal-rock body under different loading rates was designed and carried out. Finally, the differential energy instability model of the combined coal-rock body was constructed. An evaluation index of the impact tendency of the combined coal-rock body considering the elastic energy difference and the release time is proposed, which provides a multi-scale criterion for accurately evaluating the impact propensity of the combined body.
|
