Abstract
A promising large-scale energy storage is underground compressed air energy storage (CAES) in lined rock caverns. To ensure the safety and stability of storage caverns because of the influence of periodic injection during production, it is crucial to understand the mechanical behavior of lining concrete under different complex stress paths. In this study, three types of uniaxial compressive fatigue test and uniaxial creep test were conducted on concrete. The following conclusions were obtained from the results. 1) The irreversible deformation after the interval was larger than that before the interval in the discontinuous multi-step cyclic loading (DMCL) test. 2) Loading velocity significantly influenced concrete fatigue, and the irreversible deformation in the cycle of low loading velocity was greater than that in the cycle of high loading velocity. 3) The residual strain increased with an increase in stress level. 4) The creep strain increased with an increase in stress level during the multi-step creep loading test; the fractional derivative results were more consistent with the experimental results. 5) The permeability of concrete increased rapidly under the influence of an external force when the stress level exceeded 0.73.
Highlights
In the context of carbon peak and carbon neutrality, renewable energy sources, which can replace fossil energy on a large scale, present new opportunities for development (Liu et al, 2020a; Ben Yosef et al, 2021; Jiang et al, 2021; Liu et al, 2020b; Ma et al, 2021; Nair et al, 2021)
This paper presents the mechanical and seepage properties of concrete under different conditions based on three groups of cyclic loading tests and a group of creep tests
Concrete can be deformed under the influence of external forces
Summary
In the context of carbon peak and carbon neutrality, renewable energy sources, which can replace fossil energy on a large scale, present new opportunities for development (Liu et al, 2020a; Ben Yosef et al, 2021; Jiang et al, 2021; Liu et al, 2020b; Ma et al, 2021; Nair et al, 2021). The pumped hydroelectric storage (PHS) (Winde et al, 2017; Jurasz et al, 2018; Sultan et al, 2018; Liu et al, 2020c; Emmanouil et al, 2021) and compressed air energy storage (CAES) (Zhao et al, 2015; Zhang et al, 2019; Soltani et al, 2020; Li et al, 2021; Liu et al, 2021; Yang et al, 2022) have been regarded as promising large-scale electric energy storage technologies.
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