Abstract: The comprehensive development and utilization of abandoned mines is an important part of achieving the goal of ′double carbon′,and the optimization and transformation of underground space for underground gas storage is an important technical way to achieve this goal. Based on an abandoned gypsum mine,the feasibility of underground gas storage construction is verified by theoretical analysis,numerical simulation and other technical means. The results show that the combined support form of ′steel lining + surrounding rock′ can make the surrounding rock give full play to its own pressure-bearing effect and improve the support performance. When the thickness of the steel lining is 30 mm and the gas storage pressure is 6. 5 MPa,the deformation of the surrounding rock under the action of the steel lining is reduced from 1. 47 cm to 1. 18 cm. Compared with the high gas storage pressure (8. 0 MPa),the smaller gas storage pressure (6. 5 MPa) makes the Mises stress of the steel lining within the allowable stress range,and the length of the roadway exceeding the allowable stress only accounts for 12. 25%. The optimization scheme of ideal gas storage is designed,and the joint bearing design concept of ′lining + steel lining + surrounding rock′ is put forward. The original chamber type is improved,and the optimized gas storage effect is verified by the round table theory and the finite element method. The proposal and verification of the technical scheme can greatly reduce the site selection requirements of the gas storage for the stability of the surrounding rock and the geological structure of the mining area,effectively improve the stress environment of the surrounding rock,and provide new ideas for the development of compressed air energy storage technology in abandoned mines. It has the potential for large-scale application. 

Key words: abandoned mine, underground space utilization, compressed air energy storage, joint support, gas storage pressure,steel lining