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Bonded-particle discrete element modeling of mechanical behaviors of interlayered rock mass under loading and unloading conditions

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Abstract

Interlayered rock mass composed of green schist and marble is widely observed in China, such as the Jinping II hydropower project site in Sichuan Province. Its mechanical behaviors are of importance for the overall project stability. Unfortunately, for most cases, field or laboratory tests seeking to truly represent the mechanical behaviors of interlayered rock mass under dynamic loading condition is very difficult. In order to understand its mechanical performances under loading and unloading conditions, a numerical modeling was conducted to analyze its mechanical characteristics using soft package PFC2D. The numerical results show that (a) the inclined angle of interlayered rock mass has a major effect on the strength of rock specimen under triaxial compression loading, and the minimal compressive strength was generally observed at an orientation angle of 30°–45°. However, the influence of marble component on the strength of interlayered rock mass is not clear when the inclined angle is in the range of 30°–45°. (b) When neither the confining pressure nor the marble composition is varied, few cracks were generated at inclined angle of 45° than that at other angles under triaxial compression loading condition, and the micro-crack is basically characterized by shearing failure. (c) When the inclined angle increases from 0° to 90°, the minimum principal stress increases first and then decreases under unloading confining pressure, and the minimum principal stress reaches peak at an inclined angle of 45°. (d) Crack development and failure mode of interlayered rock mass are mainly influenced by the rock material properties, particles arrangement and rock layer distribution, whilst the stress path has no effect on crack development and failure mode of interlayered rock mass.

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Acknowledgements

This work was supported by the Open Research Fund of State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin (China Institute of Water Resources and Hydropower Research, Grant No. IWHR-SKL-201708), the Open Research Fund of Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education (Grant No. KLE-TJGE-B1505), and the National Natural Science Foundation of China (Grant Nos. 41541021, 41230635).

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Authors and Affiliations

  1. State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing, China

    L. X. Xiong

  2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai, China

    L. X. Xiong

  3. State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, China

    L. X. Xiong & T. B. Li

  4. Program of Water Science and Policy, College of Earth, Ocean, and Environment, University of Delaware, Newark, DE, 19716, USA

    Z. Y. Xu

  5. Terracon Consultants, 13050 Eastgate Park Way, Louisville, KY, USA

    Y. Zhang

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  1. L. X. Xiong
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  2. Z. Y. Xu
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  3. T. B. Li
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  4. Y. Zhang
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Correspondence to Z. Y. Xu.

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Xiong, L.X., Xu, Z.Y., Li, T.B. et al. Bonded-particle discrete element modeling of mechanical behaviors of interlayered rock mass under loading and unloading conditions. Geomech. Geophys. Geo-energ. Geo-resour. 5, 1–16 (2019). https://doi.org/10.1007/s40948-018-0090-x

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  • DOI: https://doi.org/10.1007/s40948-018-0090-x

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