The damage of dynamic impact on coal and rock under bidirectional static load constraint

被引：0
|
作者：
Zhao H. [1 ,2 ]
Liu Y. [2 ]
Zhang X. [1 ]
Li J. [2 ]
Wang T. [2 ]
Cheng H. [2 ]
Liu R. [2 ]
机构：
[1] Key Laboratory of Safety and High-efficienty Coal Mining, Ministry of Education, Anhui University of Science and Technology, Huainan
[2] School of Energy and Mining Engineering, China University of Mining and Technology-Beijing, Beijing
来源：
Caikuang yu Anquan Gongcheng Xuebao/Journal of Mining and Safety Engineering | 2021年 / 38卷 / 01期
关键词：
Bidirectional static load constraint; Crack propagation; Damage amount; Impact load; Impulse threshold;
D O I：
10.13545/j.cnki.jmse.2019.0505
中图分类号：
学科分类号：
摘要：
The dynamic impact test of coal samples under bidirectional static load constraints was carried out with the self-developed dynamic loading device of pendulum impact. The effects of constant impulse and incremental impulse on the damage evolution of coal samples were studied under different static load constraints. Based on the quantitative characterization of the damage degree of samples subjected to impact under different static load constraints, the crack propagation law of coal rock surface under different static load constraints has been analyzed. It has been found that the impulse threshold of coal and rock damage is different under different static load constraints, and the damage amount of coal rock under different impact modes rises with the increase of accumulative impulse. When the cumulative impulse are the same and each impact generated by each impact is greater than the threshold value of coal and rock damage, constant impulse impact is more efficient to destroy coal and rock. Under the condition of static load constraint, the size and number of crack and the bifurcation frequency increase with the static load constraint ratio, that is, as the static load constraint ratio increases, the failure mode of coal rock tends to be complicated. © 2021, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.
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页码：130 / 137and145
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