Abstract
Renewable energy resources are usually intermittent and unstable. Compressed air energy storage (CAES) provides a good solution to address this problem. Underground air storage caverns are an important part of CAES. Salt rock is known for its excellent flexibility and its extremely low porosity and permeability. During the operation of salt rock underground gas storages, surface subsidence above underground gas caverns would be generated due to the volume shrinkage of salt rock caverns. In this paper, a method to predict the subsidence above salt rock storage cavern is proposed. Firstly, using the finite-difference program Flac3D, the volume loss of the cavern caused by creep shrinkage of salt rock was calculated. Secondly, Schober’s model was applied for deformation prediction of storage caverns in salt rock. Finally, surface subsidence was calculated. The method was applied to the Jintan under-ground gas storage in salt rock, the surface subsidence for 20 years operation was calculated, and the impact of the facilities on the ground settlement was effectively accessed.
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