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Mechanical characteristics and dynamic damage evolution mechanism of coal samples in compressive loading experiments

机译：压缩载荷实验中煤样的机械特性及动态损伤演化机制

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摘要

To achieve the qualitative and quantitative damage expression, coal samples within original cracks were selected to conduct uniaxial compressive loading experiments. During this process, acoustic emission signals were collected by AEwin Test for Express-8.0 and cracks evolution were captured by video camera. The results showed that the larger the initial damage, the lower the uniaxial compressive strength and elastic modulus of coal samples. When coal samples were subjected to uniaxial compression, the primary cracks closed firstly. Then friction phenomenon might generate due to sliding along the cracks surface and the deflection might occur at the center of cracks. Finally, original cracks expanded and new cracks formed and propagated to cause sample fracture, all which leaded to acoustic emission events. AE counts and accumulated counts changed with time, which corresponded well with stress-strain. Therefore, the value of AE counts and the trend of accumulated counts qualitatively explained the damage evolution laws of loaded coal. Further, based on the damage theory of acoustic emission counts, the quantitative damage variable was proposed and calculated. What's more, the force analysis near the cracks surface at the initial loading process was explained and the cracks dynamic evolution during the whole compressive loading process was discussed. It was helpful to understand the damage evolution mechanism of coal samples.
机译：为了实现定性和定量损伤表达，选择原始裂缝内的煤样来进行单轴压缩载荷实验。在该过程中，通过AEWIN测试收集声发射信号，用于表达-8.0，通过摄像机捕获裂缝演化。结果表明，初始损坏越大，单轴抗压强度和煤样的弹性模量越低。当煤样对单轴压缩时，首先关闭初级裂缝。然后，由于沿着裂缝表面滑动，摩擦现象可能产生，并且在裂缝的中心可能发生偏转。最后，原始裂缝扩展和形成的新裂缝和繁殖以引起样品骨折，所有这些都引起声学发射事件。 AE计数和累计计数随时间变化，与应力应变相对应。因此，AE计数的价值和累积计数的趋势定性地解释了装载煤的损伤演化法。此外，基于声发射计数的损伤理论，提出并计算了定量损伤变量。更重要的是，讨论了初始加载过程中裂缝表面附近的力分析，并讨论了整个压缩加载过程中的裂缝动态演化。了解煤样的损伤进化机制是有帮助的。

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