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首页> 外文期刊>International Journal of Damage Mechanics >Deformation and damage dynamic characteristics of coal-rock materials in deep coal mines
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Deformation and damage dynamic characteristics of coal-rock materials in deep coal mines

机译：深井煤矿煤岩材料变形及损伤动态特性

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摘要

The deformation and damage characteristics of surrounding rock grow gradually with the increase of mining depth, and the mechanical behavior and damage mechanism of coal-rock materials vary greatly. In order to reveal the deformation and damage dynamic characteristics of coal-rock materials in deep mines, the macroscopic deformation characteristics of coal, rock, and concrete samples under uniaxial compression were studied. The macroscopic deformation amount, velocity, and acceleration of different samples were analyzed. The coal and rock samples exhibit regular dynamic characteristics before they lose stability and fail. The axial strain response of the coal samples changes significantly during the compact and elastic deformation stages. Besides, the relationship between the surface damage and the macroscopic deformation of sample was studied by means of visualization and image processing. The macroscopic deformation index of coal-rock materials changes significantly before and after the destabilization and failure. Based on the deformation and failure dynamic characteristics of coal and rock, the evolution rule of deformation critical values was taken as the deformation and destruction stages, which revealed the dynamic characteristics during the deformation and failure process of coal-rock materials in deep mines. The deformation critical values can be used to realize early warning of deformation and fracture of coal and rock materials in deep mines.
机译：随着采矿深度的增加，周围岩石的变形和损伤特征逐渐生长，煤岩材料的机械行为和损坏机理变化大大。为了揭示深矿山煤岩材料的变形和损伤动态特性，研究了单轴压缩下煤，岩石和混凝土样品的宏观变形特征。分析了不同样品的宏观变形量，速度和加速度。煤和岩石样品在失去稳定性之前具有规律的动态特性。在紧凑和弹性变形阶段，煤样的轴向应变响应显着变化。此外，通过可视化和图像处理研究了表面损伤与样品的宏观变形之间的关系。煤层岩材料的宏观变形指数在不稳定和失败之前和之后显着变化。基于煤炭和岩石的变形和故障动态特征，使变形临界值的演化规则作为变形和破坏阶段，揭示了深海煤岩材料变形和故障过程中的动态特性。变形临界值可用于实现深海煤和岩石材料变形和骨折的预警。

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