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<p>Throughout the long-term operation of salt cavern compressed air energy storage plants, periodic gas injection and extraction not only subject the surrounding rock to cyclic loading but also induce periodic variations in the gas temperature inside the storage area. Specifically, the surrounding rock is subjected not only to cyclic loading but also to changing temperatures. To explore the fatigue properties of salt rock after thermal cycling treatment, cyclic temperature tests were first conducted on salt rock specimens, followed by uniaxial compression and fatigue tests. The results indicate that the changing temperature has a “softening” effect on salt rock, leading to a decrease in its bearing capacity and an increase in ductility after thermal cycling treatment. This “softening” effect is most significant when the upper limit temperature increases from 100 ℃ to 120 ℃, and after hundreds of temperature cycles, its impact on the uniaxial mechanical characteristics of salt rock tends to stabilize. As the upper limit temperature increases, the fatigue life of salt rock first decreases and then increases; as the number of temperature cycles increases, the fatigue life gradually increases. As the upper limit temperature or the number of temperature cycles increases, the proportion of load cycles experienced during the decelerated and accelerated deformation stages gradually decreases, whereas the proportion of load cycles experienced during the constant rate deformation stage gradually increases. After 12,000 load cycles, the residual strain increases exponentially with increasing upper limit temperature and approximately linearly with an increasing number of temperature cycles. On the basis of the experimental results, the thermal fatigue damage induced by the periodic temperature was analyzed using elastic modulus determination, while the mechanical fatigue damage induced by the periodic mechanical loading was characterized using residual strain measurement. A fatigue damage equation considering thermal fatigue damage and mechanical fatigue damage was derived and verified, and the fatigue damage evolution of salt rock after thermal cycling treatment was analyzed using this equation.</p>

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Fatigue Properties and Damage Evolution of Salt Rock After Thermal Cycling Treatment

  • 期刊论文

  • 发表日期：

    2025年10月18日

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  • Xiao Liu,
  • Junbao Wang,
  • Xin Wang,
  • Yunhong Lin,
  • Xinrong Liu,
  • Zhanping Song

摘要

Throughout the long-term operation of salt cavern compressed air energy storage plants, periodic gas injection and extraction not only subject the surrounding rock to cyclic loading but also induce periodic variations in the gas temperature inside the storage area. Specifically, the surrounding rock is subjected not only to cyclic loading but also to changing temperatures. To explore the fatigue properties of salt rock after thermal cycling treatment, cyclic temperature tests were first conducted on salt rock specimens, followed by uniaxial compression and fatigue tests. The results indicate that the changing temperature has a “softening” effect on salt rock, leading to a decrease in its bearing capacity and an increase in ductility after thermal cycling treatment. This “softening” effect is most significant when the upper limit temperature increases from 100 ℃ to 120 ℃, and after hundreds of temperature cycles, its impact on the uniaxial mechanical characteristics of salt rock tends to stabilize. As the upper limit temperature increases, the fatigue life of salt rock first decreases and then increases; as the number of temperature cycles increases, the fatigue life gradually increases. As the upper limit temperature or the number of temperature cycles increases, the proportion of load cycles experienced during the decelerated and accelerated deformation stages gradually decreases, whereas the proportion of load cycles experienced during the constant rate deformation stage gradually increases. After 12,000 load cycles, the residual strain increases exponentially with increasing upper limit temperature and approximately linearly with an increasing number of temperature cycles. On the basis of the experimental results, the thermal fatigue damage induced by the periodic temperature was analyzed using elastic modulus determination, while the mechanical fatigue damage induced by the periodic mechanical loading was characterized using residual strain measurement. A fatigue damage equation considering thermal fatigue damage and mechanical fatigue damage was derived and verified, and the fatigue damage evolution of salt rock after thermal cycling treatment was analyzed using this equation.