考虑矿物细观结构的岩石数字化模型构建及其应用

doi:10.13722/j.cnki.jrme.2021.0116

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Abstract To better reveal the mechanism of rock fracture from the perspective of mineral meso-structure, a digital model of rock is constructed based on polarizing microscopy，computed tomography(CT) technology and digital image processing(DIP) technology，and the meso-structural characteristics of rock，such as actual mineral composition，content and spatial distribution，can be reflected through it. By comparing the results of numerical simulation experiments and physical experiments，it is found that the fracture process of the model is basically consistent with that of the real rock. The meso-fracture behavior of rock during deformation and failure, such as the initiation location, extended mode and generation mechanism of fractures in different types of mineral fractures, can be simulated. The modes of rock fracture propagation，such as transgranular and intergranular，and the types of failure，such as tensile and shear，can also be identified and quantitatively analyzed. It is found that the crack propagation mode is related to the strength of mechanical properties of mineral crystals. Specifically，the expansion mode at the strong mineral crystal is intergranular，and the expansion mode at the weak mineral crystal is intergranular and transgranular. In addition，the propagation mode of crack is also related to its mechanical mechanism. The tensile cracks，which generated in the stable development stage of micro fracture，whose propagation mode is intergranular at the strong mineral crystal，and the crack type is intergranular tensile crack. But the propagation mode at weak mineral crystal is transgranular，the crack type is intragranular tension crack. The shear cracks，which produced in the unstable fracture development stage and the post-peak failure stage，whose propagation mode at both strong and weak mineral crystals is intergranular，and the crack type is intergranular shear crack. From the perspective of crack network formation，when the distribution of strong and weak mineral crystals is relatively concentrated，a backbone crack network is formed. When the distribution of strong and weak mineral crystals is discrete，a network crack network is formed.

Key words： rock mechanics meso-structure CT technology digital image processing equivalent crystal model crack development and evolution

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0116 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/IS2/3212

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