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Characteristics of Pressure Stimulated Current and Damage Evolution of Granite under Progressive Uniaxial Loading

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  • Dexing Li

    (School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China
    School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China
    Shenzhen Urban Public Safety Technology Research Institute Co., Ltd., Shenzhen 518000, China)

  • Enyuan Wang

    (School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China)

  • Jianhua Yue

    (School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China)

  • Manman Li

    (Xuzhou Jinglan New Material Technology Co., Ltd., Xuzhou 221000, China)

  • Li Li

    (Shenzhen Urban Public Safety Technology Research Institute Co., Ltd., Shenzhen 518000, China)

  • Dongming Wang

    (School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China)

  • Wei Liang

    (Shenzhen Urban Public Safety Technology Research Institute Co., Ltd., Shenzhen 518000, China)

Abstract

The application of load on rock materials stimulates a weak current known as Pressure Stimulated Current (PSC). This study focuses on investigating the damage evolution of granite rocks through the analysis of PSC responses. Uniaxial loading experiments were conducted on granite samples, and the accompanying PSC was measured in real-time. The relationship between PSC characteristics and mechanical behaviors of granite was examined to explore precursory information related to granite failure. The damage evolution of granite was assessed using a damage variable defined as the cumulative charge (time integral of PSC). The results clearly demonstrate a close correlation between the variation of PSC and the mechanical behaviors of rock. Specifically, during the compaction and elastic deformation stages, PSC exhibits a slow and linear increase. However, once deformation enters the plastic stage, PSC demonstrates an accelerated upward trend. Additionally, it was observed that a stress drop coincides with an abnormal increase in PSC, which is followed by a rapid decay. The fluctuation observed after the abnormal increase in PSC during the accelerated growth phase can serve as a precursor of rock failure. Furthermore, the cumulative charge quantity effectively correlates with the damage process of granite samples. The stress–strain curve obtained from a theoretical constitutive model, established based on the damage variable represented by normalized cumulative charge, aligns reasonably well with the experimental results, affirming that the defined damage variable accurately reflects the damage evolution process of rocks. It is hypothesized that PSCs are carried by electrons within the rocks, which are stimulated by electron diffusion during deformation and experience a sharp increase upon rock fracturing. The research findings hold theoretical significance for predicting rockburst incidents using the PSC method.

Suggested Citation

  • Dexing Li & Enyuan Wang & Jianhua Yue & Manman Li & Li Li & Dongming Wang & Wei Liang, 2023. "Characteristics of Pressure Stimulated Current and Damage Evolution of Granite under Progressive Uniaxial Loading," Sustainability, MDPI, vol. 15(19), pages 1-18, October.
  • Handle: RePEc:gam:jsusta:v:15:y:2023:i:19:p:14526-:d:1254537
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    References listed on IDEAS

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    1. Kong, Xiangguo & He, Di & Liu, Xianfeng & Wang, Enyuan & Li, Shugang & Liu, Ting & Ji, Pengfei & Deng, Daiyu & Yang, Songrui, 2022. "Strain characteristics and energy dissipation laws of gas-bearing coal during impact fracture process," Energy, Elsevier, vol. 242(C).
    2. Stergiopoulos, Ch. & Stavrakas, I. & Triantis, D. & Vallianatos, F. & Stonham, J., 2015. "Predicting fracture of mortar beams under three-point bending using non-extensive statistical modeling of electric emissions," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 419(C), pages 603-611.
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