Abstract
Crushing of rockfill grains is one of the most important issues in the stability study of rockfill dams/embankments. In engineering applications, crushing characteristics of a rockfill grain depend strongly on its number of contact points with neighboring grains. The present work aims to propose a breakage criterion including the effects of coordination number, which refers to the increase of grain strength with the redistribution of stress towards hydrostatic stress conditions due to the continual crushing of neighboring grains. In order to analyze the influence of coordination number on grain crushing, single-particle crushing tests with different coordination numbers are first simulated by a bonded particle model using the discrete-element method (DEM). The mechanical confinement effects of neighboring grains are investigated by installing rigid walls around crushable agglomerates. One observes that the failure pattern and strength of agglomerates are significantly affected by the coordination number. The grain strength generally increases with increasing coordination number. Based on the results obtained at the grain scale, a new breakage criterion is proposed for rockfill materials. The proposed criterion is then embedded in a population balance model in DEM. The oedometer tests with three different grain sizes are simulated using the proposed criterion. In order to avoid the unrealistic mechanical response and reduce the energy accumulation in the particle spawning, a new numerical procedure is adopted in the simulations. The simulated stress–strain curve, normal compression line, and particle size distribution are in agreement with the experimental results. Comparison between the proposed criterion and some previous criteria illustrates the merits of the new criterion. The micro-responses of the samples, including the evolution of average coordination number and average particle stress, are also discussed. Discrete-element modeling and micromechanical analysis will enhance the understanding of crushing and deformation behaviors of rockfill materials.
Highlights
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The influence of coordination number on the failure pattern and crushing strength of rockfill grains is investigated at the grain scale.
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A new breakage criterion is proposed for the crushing of rockfill grains with the consideration of coordination number effects.
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A new numerical procedure is adopted to avoid the unrealistic mechanical response in the particle spawning.
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By simulating the oedometer tests with three different grain sizes, the crushing characteristics of rockfill materials are studied at the structure scale.
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Micro-mechanical analysis and discrete-element modeling will enhance the understanding of the crushing and deformation behaviors of rockfill materials.
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Acknowledgements
The authors gratefully acknowledge the financial support from the State Key Program of National Natural Science Foundation of China (No. U2040221), the Open Sharing Fund for the Large-scale Instruments of Hohai University (Nos. GX202205B; GX202204B), and the 111 Project (No. B13024). The first author gratefully acknowledges the financial support from China Scholarship Council (No. 201806710020). The oedometer test simulations in this paper have been done on the HPC Computing Mésocentre of University of Lille. The authors gratefully thank the anonymous reviewers for their constructive comments as well.
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XZ: conceptualization, methodology, software, writing—original draft, and funding acquisition. JZ: writing—review and editing, and funding acquisition. YW: writing—review and editing, and methodology. YJ: conceptualization, supervision, writing—review and editing, and methodology. J-BC: supervision, writing—review and editing, and methodology. HB: writing—review and editing, and methodology.
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Zhao, X., Zhu, J., Wu, Y. et al. A Numerical Study on the Influence of Coordination Number on the Crushing of Rockfill Materials. Rock Mech Rock Eng 55, 6279–6300 (2022). https://doi.org/10.1007/s00603-022-02985-7
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DOI: https://doi.org/10.1007/s00603-022-02985-7