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首页> 外文期刊>Arabian journal of geosciences >Experimental study on dynamic mechanical responses of coal specimens under the combined dynamic-static loading
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Experimental study on dynamic mechanical responses of coal specimens under the combined dynamic-static loading

机译：混合动态静态荷载作用下煤炭动态机械响应的试验研究

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Dynamic mechanical responses of the coal and rock mass under the combined dynamic-static loading are critical issues for exploring the disaster-causing mechanism of rock burst in coal mining. In this paper, the acoustic emission (AE) technique and high-speed camera imaging were employed, and the burst proneness of the coal specimen, the variation of AE parameters, the specimen failure mode, and the particle distribution of the fractured specimens were investigated by the combined dynamic-static loading experiments. The results indicate that the burst proneness of the coal specimen increases non-linearly as the dynamic loading rate increases. Both the energy input rate, the ringdown counts, and the hits undergo the slow increase, fast increase, and abrupt increase stages. The failure mode of the specimen is changed from shear failure to axial splitting and the final bursting failure. The relationships between the fractal dimension of the specimen fragmentation mass and the dynamic loading rate can be described by a quadratic function. When the specimen reaches the maximum damage degree, an extreme value of the dynamic loading rate (2.8 x 10(-3) s(-1)) is obtained in experiments. The disaster-causing mechanism of rock burst induced by the combined dynamic-static load is discussed from the aspects of the burst proneness of coal specimens, dynamic variation of AE parameters, the change of failure modes of specimens, and the propagation and coalescence of microcracks.
机译：组合动态静态负荷下煤炭和岩石质量的动态机械响应是探索煤矿中岩石爆破灾害机制的关键问题。本文研究了声发射（AE）技术和高速摄像机成像，研究了煤样，AE参数的变化，样品失效模式和裂缝标本的颗粒分布的突发倾向通过组合的动态静态加载实验。结果表明，随着动态负载率的增加，煤样标本的爆发尺度非线性地增加。能量输入速率，振荡计数，并击中均经历缓慢增加，快速增加，突然增加阶段。样品的故障模式从剪切失效变为轴分裂和最终爆破故障。样品碎片质量的分形尺寸与动态加载率之间的关系可以通过二次函数来描述。当样品达到最大损伤程度时，在实验中获得动态加载速率的极值（2.8×10（-3））。由煤试样的爆发展示的方面，AE参数的动态变化，样本的失效模式的变化以及微裂纹的传播和聚结的变化，讨论了由组合动态静态载荷引起的抗震机制。 。

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