This paper examines the effects of borehole arrangement on the failure process of coal-like materials based on its energy conversion and acoustic characteristics from the perspectives of energy, AE energy, AE spectrum, and frequency band. Findings from the study revealed that the presence of borehole can significantly reduce the conversion ratio and growth rate of elastic energy during the loading of coal-like material sample and delay the release of internal energy of the sample. Also, it can reduce the frequency band energy of the main frequency of acoustic emission signal but has little effect on the size and richness of the peak frequency of acoustic emission signal. The practice that makes drilling diameter and depth increase stepwise can minimize the elastic energy conversion ratio, the growth rate, and the main frequency band energy of acoustic emission signal of coal-like material sample and postpone the internal energy release of the sample to the greatest extent, so as to enrich the richness of the secondary frequency of acoustic emission signal. The results of this study have certain guiding significance for the layout of pressure relief boreholes in the production process of coal mines.

中文翻译：

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钻孔排列对类煤样样品能量转换和声学特性影响的实验研究

本文从能量，声发射能量，声发射频谱和频带的角度，根据煤的能量转换和声学特性，研究了钻孔布置对煤样材料破坏过程的影响。研究发现，钻孔的存在会显着降低煤样样品加载过程中弹性能的转化率和弹性速率，并延迟样品内能的释放。而且，它可以减小声发射信号的主频率的频带能量，但是对声发射信号的峰值频率的大小和丰富度影响很小。逐步增加钻孔直径和深度的做法可以最大程度地降低弹性能转化率，增长率，煤样材料声发射信号的主频带能量最大程度地推迟了样品内部能量的释放，从而丰富了声发射信号的二次频率的丰富性。研究结果对煤矿生产过程中泄压孔的布置具有一定的指导意义。