Compressed air energy storage (CAES) in underground mine tunnels using the technique of lined rock cavern (LRC) provides a promising solution to large-scale energy storage. A coupled thermodynamic and thermomechanical modelling for CAES in mine tunnels was implemented. Thermodynamic analysis of air during CAES operation was carried out. Difference in temperature and pressure evolution when considering real air thermophysical properties and varying heat transfer properties, as opposed to a simplified thermodynamic model, was revealed. Elastic plane strain (EPS) analysis was implemented to evaluate the influences of initial stress of the lining structure, quality grades of surrounding rock, thermal effect and the cyclic nature of loadings on mechanical behaviour. 3D elastoplastic damage (3DEPD) analysis considering steel reinforced concrete (SRC) lining was implemented to evaluate the damaged mechanical behaviour. Divergences between EPS analysis and 3DEPD analysis were unveiled. It is suggested that, when it comes to tunnel stability, simplifying the thermodynamic model is of least concern, instead, the initial stress of the lining structure is of critical importance and 3DEPD analysis considering SRC lining shall replace EPS analysis. The insights of this study will provide important guidance for the designing and feasibility study of LRC in mine tunnels for application of CAES.

中文翻译：

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地下矿井巷道压缩空气储能的热力学和热机械耦合建模


采用衬砌岩洞（LRC）技术的地下矿井巷道压缩空气储能（CAES）为大规模储能提供了一种有前景的解决方案。在矿井隧道中实施了 CAES 的热力学和热机械耦合建模。对 CAES 运行期间的空气进行热力学分析。揭示了考虑真实空气热物理特性和变化的传热特性（而不是简化的热力学模型）时温度和压力演变的差异。采用弹性平面应变（EPS）分析来评估衬砌结构的初始应力、围岩的质量等级、热效应和载荷的循环性质对机械性能的影响。采用考虑钢筋混凝土 (SRC) 衬砌的 3D 弹塑性损伤 (3DEPD) 分析来评估受损的机械行为。 EPS 分析和 3DEPD 分析之间的差异被揭示。建议在隧道稳定性方面，简化热力学模型是最不重要的，衬砌结构的初始应力至关重要，考虑SRC衬砌的3DEPD分析应取代EPS分析。本研究的见解将为煤矿巷道中 LRC 的设计和可行性研究提供重要指导，以应用 CAES。