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Meso-structures evolution rules of coal fracture with the computerized tomography scanning method

机译：断层扫描的煤系细观结构演化规律

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摘要

In order to observe the meso-structure and fracture process of coal interior, the computerized tomography (CT) scanning experimental system was developed. This system includes the nonmetal cylinder shell, loading head, strain test equipment, hydraulic pump and vacuum pump, which can scan coal or rock samples with or without gas under uniaxial and triaxial load. The uniaxial compression experiments of coal were done and CT images were obtained at different stress level. The results show that the raw coal is a kind of heterogeneous material and the internal distribution of density is inhomogeneous. The cracks are uneven and their directions are random. During the loading process the inner structures of coal changed. The density of the coal increases at the beginning of load and decreases with the increment of stress. The fractures of coal occur mainly between the skeleton and matrix and on the weak region of the skeleton. Moreover, CT images from the experiments were used to reconstruct 3D images of coal under different stress states. The deformation and fracture process can be observed obviously. These investigations can provide theoretical foundations for understanding of fracture mechanism of coal.
机译：为了观察煤内部的细观结构和破裂过程，开发了计算机断层扫描（CT）扫描实验系统。该系统包括非金属气缸壳，加载头，应变测试设备，液压泵和真空泵，它们可以在单轴和三轴载荷下扫描带有或不带有气体的煤或岩石样品。进行了煤的单轴压缩实验，获得了不同应力水平的CT图像。结果表明，原煤是一种非均质材料，密度的内部分布不均匀。裂纹不均匀，方向随机。在装载过程中，煤的内部结构发生了变化。煤的密度在载荷开始时增加，并随着应力的增加而降低。煤的破裂主要发生在骨架与基质之间以及骨架的薄弱区域。此外，来自实验的CT图像被用于重建不同应力状态下煤的3D图像。可见变形和断裂过程。这些研究可为理解煤的破裂机理提供理论依据。

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