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Experimental and numerical simulation study on the dynamic fracture of coal by gas expansion
Energy Science & Engineering ( IF 3.8 ) Pub Date : 2020-06-15 , DOI: 10.1002/ese3.757
Qifei Wang 1, 2 , Yuechao Zhao 1 , Chengwu Li 1 , Beijing Xie 1 , Honglai Xue 3
Affiliation  

The high‐pressure gas expansion‐induced deformation and dynamic fracture of coal are important parts of coal and gas outburst. To better understand the law of this process, laboratory experiments and numerical simulation are used to study the law of damage. A cavity with different pressures of CH4 or N2 was destroyed by a jack to achieve the rapid expansion of the gas and coal fracture inside. The particle size distribution of the coal particles before and after the experiment was measured, and the breakage ratio and the newly added surface area were calculated. The experimental results indicate that during the gas expansion process, the breakage ratio of coal and the newly added surface area clearly increase with the increase in gas pressure. Finally, a numerical model based on peridynamic theory was developed to simulate crack generation and the propagation of coal induced by the expansion of gases at different pressures. The numerical simulation results show that the higher the initial gas pressure is, the higher the number of failure units. Moreover, only when the gas pressure is large enough will the coal crack in various directions at the same time.

中文翻译:

瓦斯膨胀对煤动态破坏的实验与数值模拟研究

煤的高压瓦斯膨胀诱发的变形和动态断裂是煤和瓦斯突出的重要部分。为了更好地了解此过程的规律,使用了实验室实验和数值模拟来研究破坏规律。具有不同压力的CH 4或N 2的被千斤顶破坏,以使内部的瓦斯和煤破裂迅速膨胀。测量实验前后煤颗粒的粒径分布,并计算破损率和新增加的表面积。实验结果表明,在瓦斯膨胀过程中,煤的破损率和新增加的表面积随气压的增加而明显增加。最后,建立了一个基于周动力理论的数值模型,以模拟在不同压力下气体膨胀引起的裂纹产生和煤的传播。数值模拟结果表明,初始气压越高,失效单元数越多。此外,
更新日期:2020-06-15
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