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The Effects of Cycle Frequency on Mechanical Behavior of Rock Salt for Energy Storage

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Abstract

Salt caverns are used to store different energy sources, resulting in different periodic operating frequencies. To investigate the influence of the cycle frequencies on the mechanical behavior of rock salt, uniaxial stepped cyclic loading tests with successively decreasing, successively increasing and arbitrarily changing frequency were conducted. The deformation and dissipated energy under different frequencies were compared and analyzed. The test results demonstrate that the cycle frequency slightly affects the deformation evolution and that effect only appears when the adjacent frequencies change sharply (more than 50 times). The strain induced in one frequency stage (stage deformation) caused by high frequency is greater than that at low frequency. The dissipated energy is affected significantly by frequency. The individual dissipated energy decreases nearly as a power function with the frequency, while the stage dissipated energy shows the opposite trends due to the large increase of the loading cycles. In general, a quick injection and withdrawal is more dangerous for surrounding rock. The results are helpful for the operation of  salt cavern used for energy storage.

Highlights

  • A novel test method with good accuracy and reliability—‘stepped varying frequencies at the same cyclic stress’ is conducted to study the effect of frequency.

  • Deformation of rock salt is slightly affected by the changing frequency.

  • The individual dissipated energy decreases with the increase of frequency, while the accumulated dissipated energy in a frequency stage shows the opposite.

  • The damage and deformation of the rock surrounding a salt cavern are relatively large when the cyclic loading is fast.

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Acknowledgements

The work presented in this paper is supported by the National Natural Science Foundation of China (Grant No. 5187041724). The authors wish to offer their gratitude and regards to prof. Jaak J Daemen, Mackay School of Earth Sciences and Engineering, University of Nevada, for his thoughtful proofreading of this paper.

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Authors and Affiliations

  1. PowerChina Huadong Engineering Corporation Limited, Hangzhou, 310014, Zhejiang, China

    Yue Han, Hao Cui & Ning Liu

  2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, 430071, Hubei, China

    Hongling Ma

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  1. Yue Han
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  2. Hongling Ma
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  4. Ning Liu
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Correspondence to Yue Han or Hongling Ma.

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Han, Y., Ma, H., Cui, H. et al. The Effects of Cycle Frequency on Mechanical Behavior of Rock Salt for Energy Storage. Rock Mech Rock Eng 55, 7535–7545 (2022). https://doi.org/10.1007/s00603-022-03040-1

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  • DOI: https://doi.org/10.1007/s00603-022-03040-1

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