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| 岩块钻孔卸压模拟试验研究及卸压机理 |
| Research On Pressure Relief Simulation Test And Mechanism Of Rock Block Drilling |
| 投稿时间：2023-10-10 修订日期：2024-01-17 |
| DOI： |
| 中文关键词: 侧向约束;冲击地压;钻孔卸压;声发射 |
| 英文关键词: lateral constraint; Rock burst; Drilling pressure relief; Acoustic emission |
| 基金项目: |
| 作者 | 单位 | 邮编 | | 刘金州 | 湖南科技大学 资源环境与安全工程学院 | 411201 | | 王平* | 湖南科技大学 资源环境与安全工程学院 | 411201 |
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| 中文摘要: |
| 针对孤岛工作面产生的高应力集聚问题,采用室内实验、理论分析等方法相结合,对受侧向约束作用的试件进行钻孔卸压,通过改变孔径、孔深、孔间距三个因素,研究了试件钻孔卸压效果的变化规律。结果表明：卸压效果受孔径、孔间距、孔深影响均较为明显,随着钻孔直径、深度、间距的增加,试件单轴抗压强度值呈下降趋势,即卸压效果与孔径、孔间距、孔深成正相关；试件加载过程中声发射的b值呈上下波动态势,岩块裂隙的发展比煤体的裂隙发展更为稳定；岩石临近破坏,振铃计数突增,能量累计数迅速上升,b值有所下降,可作为岩石破坏前兆信息,能在一定程度上预测冲击地压的发生；钻孔卸压降低了煤岩体内能量的储存,使得冲击地压发生的概率降低。 |
| 英文摘要: |
| In order to solve the problem of high stress concentration caused by isolated island working face, laboratory experiment and theoretical analysis were used to drill and relieve the pressure of specimens subjected to lateral constraint. By changing the three factors of aperture, hole depth and hole spacing, the variation rule of the pressure relief effect of drilling was studied. The results show that the pressure relief effect is significantly affected by the aperture, hole spacing and hole depth. With the increase of the diameter, depth and hole spacing, the uniaxial compressive strength value of the specimen shows a decreasing trend, that is, the pressure relief effect is positively correlated with the aperture, hole spacing and hole depth. The AE b value fluctuates up and down during the loading process, and the crack development of rock mass is more stable than that of coal mass. When the rock is about to fail, the ringing count increases abruptly, the cumulative energy count increases rapidly, and the b value decreases, which can be used as the precursor information of rock failure, and can predict the occurrence of rock burst to a certain extent. Borehole pressure relief reduces the energy storage in coal and rock mass, which reduces the probability of rock burst. |
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