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Mechanical behavior of porous rock based on the 3D digital image reconstruction and parallel computation

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Abstract

Basalts have a wide range of porosity and pore size. Understanding the spatial and geometry characteristics of basalt pores is vital to studying their mechanical and physical properties. In this study, the geometry, shape, size, and distribution of basalt pores were obtained by the computed tomography (CT) scan. In addition, the realistic failure process analysis code (RFPA3D-digital), combined with high-resolution CT images, digital image processing technology, and parallel computing technology, was applied to reconstruct 3D models that could reflect the actual pore structure of the basalt specimens. The element size of the numerical models can be as small as 1/3 mm. Direct tension and Brazilian disc tests were performed on the numerical models to study the mechanical properties and crack evolution mechanism. The damage types were also analyzed based on the acoustic emission events recorded in the Brazilian disc and direct tension tests. The results indicated that the porosity (5.14–26.17%), pore sizes, and spatial distributions of pores affected the final failure modes and tensile strengths in the uniaxial tension and Brazilian disc tests. With increasing porosity, the tensile strength of basalt specimens tended to decrease. It was found that the tensile strengths measured by the Brazilian disc tests were usually larger than those by direct tension tests because of the different failure modes and crack propagation processes of the two test methods. The results of this study are significant for gaining insight into the mechanical properties and crack evolution behaviors of basalts under various conditions.

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Funding

This research was supported by the National Natural Science Foundation of China (Grant nos. 41977219, 51779031).

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Correspondence to Zhengzhao Liang.

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Lang, Y., Liang, Z., Dong, Z. et al. Mechanical behavior of porous rock based on the 3D digital image reconstruction and parallel computation. Environ Earth Sci 81, 438 (2022). https://doi.org/10.1007/s12665-022-10566-8

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  • DOI: https://doi.org/10.1007/s12665-022-10566-8

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