为探讨水电站闲置洞室改建为储气库的利用价值，通过文献调研总结水电站地下洞室的工程布局特点、结构型式和地质条件，结合数值分析手段对比分析不同改建方式下的受力特性，并提出相应的改建原则、方法和实施流程。研究表明： 1）将水电站闲置导流洞改建为地下储气库可大幅降低建造成本、充分利用现有地下空间资源，并能依托水电站既有道路与电力接入设施，实现闲置资源的再生利用； 2）可通过限定埋深与围岩等级，确保储气库以及水电站既有运行洞室的基础稳定性； 3）在条件允许的前提下，储气库宜优先采用环形布置方式，利用其结构连通性显著提升洞内热均衡性并降低温控成本； 4）改建方式包括洞室断面局部修整、断面型式改建、扩挖和新增洞室等多种类型，城门洞形储气库断面局部修整可降低20.87%的衬砌拉应力和90.93%的拉应变，采用圆形洞室可降低40.43%的衬砌拉应力和97.87%的拉应变； 5）为满足高压气体的密封要求，所有改建后的洞室均需增设密封层结构； 6）利用水电站闲置洞室改建为压缩空气储能地下储气库，在技术可行性与综合效益方面均具备显著优势。

Advances in compressed air energy storage (CAES) technology, coupled with implementation of the integrated “wind-solar-hydro-storage” clean energy development strategy, have created new opportunities for repurposing idle caverns in hydropower projects. To evaluate the feasibility of converting such idle caverns into underground gas-storage facilities, the engineering layout characteristics, structural types, and geological conditions of underground hydropower caverns are first summarized through a literature review. Numerical analyses are then conducted to compare the mechanical behavior of different cavern reconstruction types. Finally, reconstruction principles, methods, and implementation procedures are proposed accordingly. Results indicate that repurposing idle diversion tunnels at hydropower stations into underground gas-storage facilities for CAES offers several advantages. This approach substantially reduces construction costs and improves utilization of existing underground space while promoting resource reuse through existing access roads and power-supply infrastructure. The stability of both the gas-storage cavern and the existing operational caverns can be ensured through appropriate control of burial depths and surrounding rock grades. When conditions permit, an annular layout is preferred for the gas-storage facility because its connectivity considerably enhances thermal equilibrium within the cavern and reduces temperature-control costs. Reconstruction approaches include localized section modification, cross-sectional shape alteration, cavern expansion, and new cavern excavation. For a horseshoe-shaped cavern, localized section modification reduces lining tensile stress and strain by 20.87% and 90.93%, respectively, whereas for a circular cavern, the corresponding reductions reach 40.43% and 97.87%. To meet the sealing requirements for high-pressure gas storage, all reconstructed caverns must also be equipped with a sealing layer. In summary, converting idle hydropower caverns into CAES underground gas-storage facilities offers clear advantages in both technical feasibility and overall benefits.