张慧梅, 慕娜娜. 基于三维重构的冻融岩石细观损伤研究1)[J]. 力学与实践, 2021, 43(5): 687-694. DOI: 10.6052/1000-0879-21-064
引用本文: 张慧梅, 慕娜娜. 基于三维重构的冻融岩石细观损伤研究1)[J]. 力学与实践, 2021, 43(5): 687-694. DOI: 10.6052/1000-0879-21-064
ZHANG Huimei, MU Nana. STUDY ON MESO-DAMAGE OF FREEZE-THAW ROCKS BASED ON 3D RECONSTRUCTION1)[J]. MECHANICS IN ENGINEERING, 2021, 43(5): 687-694. DOI: 10.6052/1000-0879-21-064
Citation: ZHANG Huimei, MU Nana. STUDY ON MESO-DAMAGE OF FREEZE-THAW ROCKS BASED ON 3D RECONSTRUCTION1)[J]. MECHANICS IN ENGINEERING, 2021, 43(5): 687-694. DOI: 10.6052/1000-0879-21-064

基于三维重构的冻融岩石细观损伤研究1)

STUDY ON MESO-DAMAGE OF FREEZE-THAW ROCKS BASED ON 3D RECONSTRUCTION1)

  • 摘要: 为了研究冻融作用下岩石的细观损伤劣化机理,以冻融岩石CT扫描试验为基础,红砂岩CT图像为研究对象,借助三维重构技术和分形理论,获取表征岩石细观结构特征的孔隙率和分形维数,定义用分形维数表征的冻融岩石损伤变量,分析冻融环境下红砂岩的细观损伤演化规律。结果表明:通过图像处理和三维重构技术能够获得表征岩石宏观损伤劣化以及细观孔隙结构发育情况的三维数字化模型;损伤演化方式对应着岩体内部孔隙发育情况,随着冻融次数的增加,红砂岩的孔隙率逐渐增大,分形维数则逐渐降低;基于细观孔隙与裂纹扩展形态的分形特征定义的冻融岩石损伤变量,与宏观建立的损伤变量具有较好的一致性,能够很好地从细观结构变化的角度说明岩石的冻融破坏过程。

     

    Abstract: This paper studies the meso-damage and deterioration mechanism of rocks under freezing and thawing. First, the computed tomography (CT) images of red sandstone was obtained based on CT scanning test using. Then, the images were analysed by using image processing technology of three-dimensional reconstruction, and the porosity and fractal dimensions that characterize the meso-structure of the rock were obtained. And then the damage evolution law of red sandstone under the freeze-thaw environment was studied after adopting a fractal dimension to depict the damage variable of freeze-thaw rocks. Results show that: 1) through image processing and three-dimensional reconstruction technology, a three-dimensional reconstruction model that characterizes the macroscopic damage and deterioration of the rock and the development of the mesopore structure can be obtained; 2) the damage evolution corresponds to the development of pores inside the rock mass, in other words, with the increase of freeze-thaw cycles, the porosity of red sandstone increases gradually, and the fractal dimension decreases gradually; 3) the freeze-thaw rock damage variable defined based on the fractal characteristics of the meso-pore and crack growth morphology has good consistency with the macro-established damage variable, which can explain the freeze-thaw failure process of rocks from the perspective of meso-structure changes.

     

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