Abstract
The ratio of unconfined compressive strength to tensile strength (UCS/T) is a fundamental mechanical characteristics of rock materials, and the macroscopic mechanical properties of rocks under compression and tension conditions are seriously affected by microcracks. In this study, the numerical samples with three different microcrack distribution morphology (triangular mesh microcrack distribution morphology (T-MDM), Voronoi mesh microcrack distribution morphology (V-MDM), uniform microcrack distribution morphology (U-MDM)) were established based on different geometric forms. The effects of microcrack distribution morphology, microcrack density, and microcrack-matrix bond strength ratio on the mechanical properties of rocks were investigated, and the influence of various factors on the compression-tensile strength ratio was further discussed. Results showed that the rock samples with regular microcrack distribution morphology (T-MDM and V-MDM) exhibited a more reasonable compression-tensile strength ratio than those with random microcrack distribution morphology (U-MDM), and microcrack density has a significant effect on compression-tensile strength ratio under low bond strength ratio. Further, when the microcrack-matrix bond strength ratio is within the range of 0.05–0.15, the compression-tensile strength ratio of rock is basically between 10 and 30. The research results can provide reference for the construction of microstructure in numerical model and the simulation of reasonable mechanical behavior of rock.
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Funding
The National Key R&D Program of China (2018YFC1508501), the National Natural Science Foundation of China (Grants Nos. 41831278,51679071), and the Natural Science Foundation of Jiangsu Province (Grant No. BK20171434) supported this work.
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Responsible Editor: Zeynal Abiddin Erguler
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Chen, X., Shi, C., Ruan, HN. et al. Numerical simulation for compressive and tensile behaviors of rock with virtual microcracks. Arab J Geosci 14, 870 (2021). https://doi.org/10.1007/s12517-021-07163-7
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DOI: https://doi.org/10.1007/s12517-021-07163-7