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<p>To analyze the energy dissipation characteristics of granite under different cyclic loading paths, uniaxial cyclic loading experiments are performed on granite under six loading paths using an RE-8100S rock universal fatigue testing machine and SAEU2S acoustic emission system. The influence of the cyclic loading path on its energy dissipation characteristics is discussed. The results show that the development characteristics of the number and intensity of AEs are primarily related to the cyclic amplitude. Higher cyclic amplitude corresponds to more AE events, and lower cyclic amplitude corresponds to fewer AE events. The dynamic elastic modulus evolution is related not only to the damage but also to the internal structural changes of the rock samples, making it also directly related to the loading path. The overall law of the dissipation energy density is directly related to the load level but not the cyclic loading path. The dissipation energy density has obvious numerical jumps between the cyclic loading stages. Decreasing load level decreases the dissipation energy density stepwise, while increasing load level increases the dissipated energy density stepwise. Similar to the dissipated energy density, the overall law of the damping ratio is directly related to the load level and is nonlinear. The difference is that the development of the damping ratio is nearly continuous and there are no obvious numerical jumps between stages. In general, the energy dissipation characteristics of granite have a relationship with the cyclic loading path but are primarily related to the load level.</p>

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Energy Dissipation Characteristics of Granite under Different Cyclic Loading Paths

  • 期刊论文

  • 发表日期：

    2026年7月7日

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  • P. Zhang,
  • Q. W. Zhang,
  • S. K. Zhang,
  • Y. X. Liu,
  • Y. H. Zhu,
  • R. Q. Zhen

摘要

To analyze the energy dissipation characteristics of granite under different cyclic loading paths, uniaxial cyclic loading experiments are performed on granite under six loading paths using an RE-8100S rock universal fatigue testing machine and SAEU2S acoustic emission system. The influence of the cyclic loading path on its energy dissipation characteristics is discussed. The results show that the development characteristics of the number and intensity of AEs are primarily related to the cyclic amplitude. Higher cyclic amplitude corresponds to more AE events, and lower cyclic amplitude corresponds to fewer AE events. The dynamic elastic modulus evolution is related not only to the damage but also to the internal structural changes of the rock samples, making it also directly related to the loading path. The overall law of the dissipation energy density is directly related to the load level but not the cyclic loading path. The dissipation energy density has obvious numerical jumps between the cyclic loading stages. Decreasing load level decreases the dissipation energy density stepwise, while increasing load level increases the dissipated energy density stepwise. Similar to the dissipated energy density, the overall law of the damping ratio is directly related to the load level and is nonlinear. The difference is that the development of the damping ratio is nearly continuous and there are no obvious numerical jumps between stages. In general, the energy dissipation characteristics of granite have a relationship with the cyclic loading path but are primarily related to the load level.