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Influence of Loading Rate on the Energy Evolution Characteristics of Rocks under Cyclic Loading and Unloading

Author

Listed:
  • Jielin Li

    (School of Resources and Safety Engineering, Central South University, Changsha 410083, China
    Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province, Shaoxing 312000, China)

  • Liu Hong

    (School of Resources and Safety Engineering, Central South University, Changsha 410083, China)

  • Keping Zhou

    (School of Resources and Safety Engineering, Central South University, Changsha 410083, China)

  • Caichu Xia

    (Key Laboratory of Rock Mechanics and Geohazards of Zhejiang Province, Shaoxing 312000, China
    College of Civil Engineering, Tongji University, Shanghai 200092, China)

  • Longyin Zhu

    (School of Resources and Safety Engineering, Central South University, Changsha 410083, China)

Abstract

To analyse the effect of loading rate on the energy evolution of rocks under cyclic loading and unloading, tests on saturated limestone were conducted at loading rates of 0.15, 0.2, and 0.3 mm/min, and the evolution characteristics of plastic, elastic, dissipation, and input energies were examined under different loading rates. The results indicated that the plastic strain in the entire test was directly proportional to the loading rate. In addition, strength, residual stress, plastic energy, and dissipation energy under residual resistance were inversely proportional to the loading rate. The plastic strain exhibited a decreasing–stabilising–increasing trend, and the smaller loading rate delayed the “increasing” trend. The increasing extent of each energy exhibited the following trend: input > elastic > plastic > dissipation energy. Furthermore, the first three types of energy exhibited a slow–fast–slow–fast increase trend. The dissipation energy exhibited a fast–steady–fast–slow–fast increase trend. Additionally, the elastic energy index exhibited a large increase–steady increase–decrease trend, which was proportional to the loading rate. The damping ratio exhibited a decrease–increase–decrease–increase–decrease trend which was proportional to the loading rate in the compaction stage and inversely proportional to the plastic stage.

Suggested Citation

  • Jielin Li & Liu Hong & Keping Zhou & Caichu Xia & Longyin Zhu, 2020. "Influence of Loading Rate on the Energy Evolution Characteristics of Rocks under Cyclic Loading and Unloading," Energies, MDPI, vol. 13(15), pages 1-16, August.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:15:p:4003-:d:393938
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