The steel-lined sealing layer

as a critical component of compressed air energy storage(CAES) underground lined gas reservoirs

requires careful thickness selection to ensure operational safety and construction costeffectiveness. This paper investigates the influences of sealing layer thickness

lining thickness

and gas reservoir pressure on surrounding rock deformation through full factorial experimental methodology

accompanied by parameter sensitivity analysis. Results demonstrate that surrounding rock deformation decreases with increasing steel lining thickness and concrete lining thickness

while increasing proportionally with gas reservoir pressure. An optimal design value exists for steel lining thickness

showing a positive correlation with reservoir pressure. Sensitivity analysis reveals that the three influencing factors on surrounding rock deformation are prioritized as: internal pressure > lining thickness > sealing layer thickness. For Mises stress in the steel-lined sealing layer

the sensitivity ranking follows: internal pressure > sealing layer thickness > lining thickness. These findings provide valuable references for parameter selection in the design of CAES underground lined gas storage. The research results have reference value for the selection of design parameters for underground lined compressed air energy storage facilities.