INFLUENCE OF HIGH-FREQUENCY THERMOMECHANICAL COUPLING EFFECT ON LONG-TERM DEFORMATION OF THE SALT ROCK RENEWABLE ENERGY STORAGE

Salt rock is recognized as an ideal medium for underground energy storage because of its integrity. With the proposal of dual-carbon strategy, salt rock for underground renewable energy storage has attracted much attention. However, the high-frequency injection and production during the salt rock renewable energy storage operation result in the high-frequency variation of the temperature and stress field in the salt cavern. In this article, the thermal-mechanical coupling simulation of salt rock renewable energy storage has been conducted to acquire the long-term deformation characteristics under high-frequency injection and production, which are compared to the deformation of traditional salt rock energy storage. The results show that the maximum displacement of the surrounding rock increases by 7.8% when thermal coupling is considered in the renewable energy storage. Compared to the traditional energy storage, the thermal effect on the renewable energy storage is more significant. The influence of the thermal effect should be concerned in the stability assessment of the renewable energy storage.