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<p>Compressed air energy storage (CAES) in abandoned coal mines presents a promising large-scale energy storage solution, but long-term air pressure induces creep damage. This study investigates the creep behavior of narrow gas storage spaces under static constant pressure and dynamic cyclic charging-discharging conditions, and spatial and lifecycle differences in creep characteristics are analyzed, along with the effects of cross-sectional shape, lining, and air pressure on creep damage. Key findings include (1) surrounding rock transitions from decelerated to stable creep, with displacement growth rates and plastic zone expansion diminishing until stabilization, (2) cyclic conditions produce greater creep deformation than static pressure. After 20&#xa0;years, vertical and horizontal displacements exceed constant-pressure results by factors of 2.73 and 2.34, with the displacement growth rate 2.5 times higher, (3) displacement ratios across cross sections follow: large-tank &gt; semi-circular arch &gt; circular, and (4) displacement increases with mean pressure <i>a</i> at constant semi-amplitude <i>b</i>, while at fixed <i>a</i>, displacement first decreases then rises with <i>b</i>.</p>

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Stability of Gas Storage in Narrow Abandoned Roadways Under Long-Term Creep

  • 期刊论文

  • 发表日期：

    2025年7月25日

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  • Yunong Xu,
  • Yuejin Zhou,
  • Run Hu,
  • Xiyu Liu,
  • Jichu Chen,
  • Chaobin Zhu

摘要

Compressed air energy storage (CAES) in abandoned coal mines presents a promising large-scale energy storage solution, but long-term air pressure induces creep damage. This study investigates the creep behavior of narrow gas storage spaces under static constant pressure and dynamic cyclic charging-discharging conditions, and spatial and lifecycle differences in creep characteristics are analyzed, along with the effects of cross-sectional shape, lining, and air pressure on creep damage. Key findings include (1) surrounding rock transitions from decelerated to stable creep, with displacement growth rates and plastic zone expansion diminishing until stabilization, (2) cyclic conditions produce greater creep deformation than static pressure. After 20 years, vertical and horizontal displacements exceed constant-pressure results by factors of 2.73 and 2.34, with the displacement growth rate 2.5 times higher, (3) displacement ratios across cross sections follow: large-tank > semi-circular arch > circular, and (4) displacement increases with mean pressure a at constant semi-amplitude b, while at fixed a, displacement first decreases then rises with b.