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Effects of strength property difference on shear strength of joint of binary media

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Abstract

For rock joint, previous researches mainly focused on the joint with the same materials on both sides. However, in rock engineering, there are many joints of binary media, such as rock–concrete joint in dam engineering. In this case, the difference in materials leads the shear strength and failure area of joint to differ significantly from those of the same media on both sides. Therefore, it is quite necessary to investigate the shear mechanical properties of joints of binary media in depth. In this study, considering the micro characteristic of joint, the relationship between shear strength of joint of binary media (τMix) and those of two corresponding homogeneous media (τHard and τWeak), as well as the influencing factors, was lucubrated. Furthermore, based on the laboratory test data, the direct shear tests of joints of binary media with different values of joint roughness coefficient (JRC) were simulated by discrete element numerical simulation method to explore the relationship between the binary factor and JRC, as well as normal stress, and ultimately. Finally, an empirical formula for estimating the shear strength of joints of binary media was proposed and verified.

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Acknowledgements

This paper gets its funding from Project (2018JJ2500, 2020JJ5715) supported by Hunan Provincial Natural Science Foundation of China; Project (2018JJ2500) supported by Hunan Provincial Natural Science Foundation of China; Project (51774322, 51774131, 51774107) supported by the National Natural Science Foundation of China; Project (No. 2019zzts030) supported by the Fundamental Research Funds for the Central Universities of Central South University. The authors wish to acknowledge these supports.

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  1. School of Resources and Safety Engineering, Central South University, Changsha, 410083, Hunan, China

    Lu Han, Hang Lin, Yifan Chen & Daxing Lei

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  1. Lu Han
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  2. Hang Lin
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  3. Yifan Chen
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  4. Daxing Lei
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Correspondence to Hang Lin or Yifan Chen.

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Han, L., Lin, H., Chen, Y. et al. Effects of strength property difference on shear strength of joint of binary media. Environ Earth Sci 80, 712 (2021). https://doi.org/10.1007/s12665-021-10041-w

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