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Study on the Weakening Law and Classification of Rock Mass Damage under Blasting Conditions

Author

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  • Rui Yue

    (School of Land and Resources Engineering, Kunming University of Science and Technology, Kunming 650093, China
    Yunnan Key Laboratory of Sino-German Blue Mining and Utilization of Special Underground Space, Kunming University of Science and Technology, Kunming 650093, China)

  • Kegang Li

    (School of Land and Resources Engineering, Kunming University of Science and Technology, Kunming 650093, China
    Yunnan Key Laboratory of Sino-German Blue Mining and Utilization of Special Underground Space, Kunming University of Science and Technology, Kunming 650093, China)

  • Qingci Qin

    (School of Land and Resources Engineering, Kunming University of Science and Technology, Kunming 650093, China
    Yunnan Key Laboratory of Sino-German Blue Mining and Utilization of Special Underground Space, Kunming University of Science and Technology, Kunming 650093, China)

  • Mingliang Li

    (School of Land and Resources Engineering, Kunming University of Science and Technology, Kunming 650093, China
    Yunnan Key Laboratory of Sino-German Blue Mining and Utilization of Special Underground Space, Kunming University of Science and Technology, Kunming 650093, China)

  • Meng Li

    (Guohua (Jiangsu) Wind Power Co., Ltd., Dongtai 224200, China)

Abstract

To study the effects of declining mechanical parameters caused by blasting excavation on slopes, we introduced the damage degree index D s, and established a relationship between D s and the disturbance factor D in the Hoek–Brown criterion, along with a basic quality index BQ for the rock mass. We then explored the change law for the degree of rock damage D s as a function of the disturbance factor D . We also used a phosphate mine slope in Guizhou Province for reference, and analyzed the process of damage evolution of the slope based on the RHT (Riedel-Hiermaier-Thoma Constitution) in LS-DYNA (Yunnan, China). Results showed a direct relationship between the GSI value in the Hoek–Brown criterion and the initial damage degree of the slope. As D s increases, D increases exponentially. However, the compressive strength, elastic modulus, cohesion, and internal friction angle decreased nonlinearly, and the tensile strength of the rock mass decreased linearly. Among these parameters, the compressive strength decreased the most rapidly, while the internal friction angle decreased slowly. We also established a new grade for rock self-stabilization with D s as the evaluation standard. Thus, these results may provide a theoretical basis for determining the mechanical properties of rocks for future slope protection and stability evaluations.

Suggested Citation

  • Rui Yue & Kegang Li & Qingci Qin & Mingliang Li & Meng Li, 2022. "Study on the Weakening Law and Classification of Rock Mass Damage under Blasting Conditions," Energies, MDPI, vol. 15(5), pages 1-13, March.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:5:p:1809-:d:761530
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    References listed on IDEAS

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    1. Ali Haghnejad & Kaveh Ahangari & Parviz Moarefvand & Kamran Goshtasbi, 2019. "Numerical investigation of the impact of rock mass properties on propagation of ground vibration," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 96(2), pages 587-606, March.
    2. Zhaowei Yang & Wenbo Lu & Qidong Gao & Peng Yan & Ming Chen & Haoran Hu, 2018. "Back Analysis and Calculation of Dynamic Mechanical Parameters of Rock Mass with Measured Blasting Vibration Signals," Mathematical Problems in Engineering, Hindawi, vol. 2018, pages 1-11, November.
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