Analysis of the stability of the overlying rock mass for silo type lined rock caverns in compressed air energy storage
With the rapid development of the new energy industry and to meet the needs of energy storage,the design and construction of compressed air energy storage(CAES),especially their large underground storage caverns,have become a hot topic in research and practice.The stability of the overlying rock mass is the core issue to ensure their safe operation.By adopting the Mohr-Coulomb strength criterion and basing on the limited stress field of the rock mass,the potential instability modes of shallow buried silo type lined rock caverns(LRC)are reduced to the initial value problem of a set of three-dimensional ordinary differential equations,and a solution method is provided.The reliability of this method has been verified through comparison and analysis with physical model experiment results.Furthermore,a three-dimensional model of passive geostatic pressure under shear mechanics in the limit stress state has been established,which can be used to calculate the safety factor,thereby quantitatively evaluating the stability of the overlying rock mass.Parameter analysis results show that the in-situ stress ratio significantly affects the potential fracture face morphology,followed by the internal friction angle,revealing that a in-situ stress ratio is beneficial for stability.The parameters that significantly affect the safety factor are the burial depth and the maximum air storage pressure.The research analysis provides key design parameter references for the design of large underground silo type LRC to ensure their stability and safety.
compressed air energy storagelined rock cavernsair storagestability
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