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<p>The conversion of abandoned coal mine roadways into compressed air energy storage (CAES) caverns presents a promising solution for repurposing underground spaces. This study introduces an innovative approach using integral rubber airbags to seal roadway CAES caverns. We developed a large-scale physical model testing system to investigate the elastic mechanical responses of CAES caverns under various conditions, including different in-situ stress combinations, cyclic charging–discharging operations (4–7&#xa0;MPa and 4–9&#xa0;MPa), and high-pressure air storage (9&#xa0;MPa). An analytical model based on experimental data was established to elucidate the working mechanism of the integral flexible sealing system. Results indicate that, the surrounding rock stress distribution is jointly influenced by internal pressure and in-situ stress, exhibiting symmetrical patterns when these pressures are comparable. The surrounding rock stress magnitude follows a consistent gradient: highest near loading boundaries &gt; intermediate in the model center &gt; lowest adjacent to the cavern. Cyclic charging–discharging operations induce periodic liner strain variations, while high-pressure air storage maintains relatively stable strains. Concrete liner circumferential strains exceed both its axial strains and the reinforcing steel bar strains at the liner–rock interface. The integral flexible sealing system effectively transfers internal pressure along the radial direction, with analytical calculations showing strong agreement with experimental stress distributions.</p>

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Large-Scale Physical Model Testing on the Elastic Mechanical Response of Integral Rubber Airbag-Sealed Coal Mine Roadways for Compressed Air Energy Storage

  • 期刊论文

  • 发表日期：

    2025年8月29日

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  • Xin Liang,
  • Qunchao Yue,
  • Lei Wang,
  • Yun Wu,
  • Lihua Hu,
  • Kai Zhang,
  • Liyuan Yu,
  • Xiaozhao Li

摘要

The conversion of abandoned coal mine roadways into compressed air energy storage (CAES) caverns presents a promising solution for repurposing underground spaces. This study introduces an innovative approach using integral rubber airbags to seal roadway CAES caverns. We developed a large-scale physical model testing system to investigate the elastic mechanical responses of CAES caverns under various conditions, including different in-situ stress combinations, cyclic charging–discharging operations (4–7 MPa and 4–9 MPa), and high-pressure air storage (9 MPa). An analytical model based on experimental data was established to elucidate the working mechanism of the integral flexible sealing system. Results indicate that, the surrounding rock stress distribution is jointly influenced by internal pressure and in-situ stress, exhibiting symmetrical patterns when these pressures are comparable. The surrounding rock stress magnitude follows a consistent gradient: highest near loading boundaries > intermediate in the model center > lowest adjacent to the cavern. Cyclic charging–discharging operations induce periodic liner strain variations, while high-pressure air storage maintains relatively stable strains. Concrete liner circumferential strains exceed both its axial strains and the reinforcing steel bar strains at the liner–rock interface. The integral flexible sealing system effectively transfers internal pressure along the radial direction, with analytical calculations showing strong agreement with experimental stress distributions.