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Mechanical and Coal Burst Breeding Mechanism of Coal Samples under True Triaxial Loading and Unloading

机译：真正的三轴装载下煤样的机械和煤爆种育种机理

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摘要

A true triaxial loading and unloading experiment entailing "y-direction stress loading, z-direction stress unloading, and x-direction displacement fixing" of coal samples was conducted. Through analysis of the stress characteristics, fracture characteristics, and energy evolution in coal samples, the mechanical and coal burst breeding mechanisms of coal samples under true triaxial loading and unloading were revealed. The experiment found that the yield stress and peak stress of coal samples were not only affected by the initial loading and unloading of lateral stress but also had a negative exponential relationship with the ratio of the unloading rate and the loading rate (RURLR), thereby establishing the stress equation of coal samples under a true triaxial loading and unloading. There was a yield turning point in the stress-time curve of coal samples, and the difference in triaxial stress and acoustic emission before, and after, yield was significant. It was found that a high unloading rate and high initial stress are precursors to coal sample bursting. During loading and unloading, the high-energy area expanded, but its location was always fixed to within a certain area. The energy in this area was rapidly released to form a burst source when the sample was subjected to high-speed unloading. The nonbursting coal samples and the burst coal samples showed characteristic slabbing and bursting behaviours, respectively: the former corresponding to the acoustic emission energy value being two orders of magnitude lower than the latter. The research results can provide a reference for the study of mechanical behaviours and coal burst criteria in the rock surrounding a coal roadway excavation.
机译：进行了一个真正的三轴加载和卸载实验，其具有“Y方向应力负载，Z方向应力卸载和X方向位移固定”的煤样。通过分析煤样的应力特性，断裂特性和能量演化，揭示了真正的三轴装卸下煤样和卸载的机械和煤爆种育种机制。实验发现，煤样的屈服应力和峰值应力不仅受到横向应力的初始装载和卸载的影响，而且还具有卸载率和装载速率（Rurlr）的比例的负指数关系，从而建立真正的三轴装卸下煤样的应力方程。煤样的应力时间曲线存在屈服转点，以及三轴应力和声发射之前的差异，之后，产量显着。发现高卸载率和高初始应力是煤样爆裂的前兆。在装载和卸载期间，高能区域扩展，但其位置总是固定在某个区域内。当样品经受高速卸载时，该区域中的能量快速释放以形成突发源。非萎缩的煤样和爆破煤样品分别显示出特征的斜坡和爆裂行为：前者对应于声发射能量值的两个数量级低于后者。研究结果可以为煤道路挖掘围绕岩石的机械行为和煤爆标准的研究提供参考。

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  • 来源
    《Advances in civil engineering》 |2019年第14期|6050975.1-6050975.15|共15页
  • 作者

    Shen Wei; Dou Lin-ming; He Hu;

  • 作者单位

    Huaiyin Inst Technol Fac Architecture & Civil Engn Huaian 223001 Jiangsu Peoples R China|China Univ Min & Technol Sch Mines Key Lab Deep Coal Resource Min Minist Educ Xuzhou 221116 Jiangsu Peoples R China;

    China Univ Min & Technol Sch Mines Key Lab Deep Coal Resource Min Minist Educ Xuzhou 221116 Jiangsu Peoples R China;

    China Univ Min & Technol Sch Resources & Earth Sci Xuzhou 221116 Jiangsu Peoples R China;

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