煤岩单轴压缩条件下声发射与破坏特征差异性研究

为了揭示单轴压缩条件下煤岩的声发射能量与破坏特征，对神东布尔台煤矿12上煤及其基本顶进行了单轴压缩试验，试验过程中采用DS-2声发射采集设备对煤岩样在单轴压缩条件下破坏时的声发射信号参数进行采集分析，获得了煤岩样在单轴压缩过程中破坏与声发射撞击曲线和能量曲线的差异性。研究发现，中粒砂岩和煤在单轴压缩条件下最后表现出的破坏形式存在明显不同，基本顶中粒砂岩破坏过程平缓，煤样破坏过程剧烈|中粒砂岩和煤样撞击次数的峰值基本均出现在应力曲线的峰值之前，且中粒砂岩试件的声发射事件数要远小于煤体试件的声发射事件数，验证了煤样破坏要较中粒砂岩剧烈，也为井下煤岩动力灾害的预警提供了思路。

Study on the Difference of Acoustic Emission and Failure Characteristics of Coal Rock under Uniaxial Compression

In order to reveal the acoustic emission energy and destruction characteristics of coal rock under uniaxial compression, a uniaxial compression test was performed on the 12-top coal and its basic roof of Buertai Coal Mine. Acoustic emission signal parameters of coal rock samples under uniaxial compression were collected and analyzed, and the differences between coal rock samples and acoustic emission impact curves and energy curves during uniaxial compression were obtained. The study found that the final failure modes of medium-grained sandstone and coal under uniaxial compression are significantly different. The medium-grained sandstone has a gentle failure process and destruction process of coal is fierce. The peak number of impact all appear before the peak of the stress curve, and the number of acoustic emission events of the medium-grained sandstone specimens is much smaller than coal specimens , which verified that coal samples are more severely damaged than medium-grained sandstone and provided ideas for early warning of dynamic disasters.