构造煤颗粒在单轴加卸载下的力学损伤特征

Mechanical damage characteristics of structural coal particles under uniaxial loading and unloading

为了论证构造煤在煤与瓦斯突出过程中的必要性,深化对煤与瓦斯突出发生机理的认识,对煤与瓦斯防治理论和实际工作方面提供指导,选取来自中煤集团白羊岭煤矿15煤层原生煤和构造煤颗粒作为实验样品,对构造煤的力学特性和破坏特征进行定量的分析。结果表明,构造煤在相同的受力条件下更容易发生变形和破坏。同尺度下原生煤的强度显著大于构造煤。构造煤破碎成构造煤颗粒需要提供的能量更低,其破碎条件更容易达到。这决定了构造煤具有高突出危险性和倾向性,在突出发生发展过程中起到了重要的作用。

In order to demonstrate the necessity of structural coal in the process of coal and gas outburst,deepen the understanding of the occurrence mechanism of coal and gas outburst,and provide guidance for the theory and practical work of coal and gas prevention,the primary coal and structural coal particles from 15 coal seam of Baiyangling Coal Mine of China National Coal Group were selected as experimental samples to conduct quantitative analysis on the mechanical properties and failure characteristics of structural coal.The results show that tectonic coal is more prone to deformation and failure under the same stress conditions.The strength of primary coal is significantly greater than that of structural coal at the same scale.The energy needed to break structural coal into structural coal particles is lower and the crushing conditions are easier to achieve.This determines that tectonic coal has high outburst risk and tendency and plays an important role in the occurrence and development of outburst.