Dynamic prediction of surface deformation based on convergence process ofrock salt caverns

The salt rock has a strong rheological property, which makes the salt caverns shrink gradually during operation.It will cause surface subsidence and affect the safety of surface buildings.In order to obtain the dynamic regularity of surface deformation which caused by salt mining.Based on the transfer function, established a prediction model about surface deformation induced by salt mining.That can be used for single salt rock carve and multiple carves.The model considers the caves convergence process and takes certain simplification of convergence.The proposed model only introduce cavity convergence rate as dynamic parameter, and it can be used to calculate the surface deformation easily.At the same time, the results of surface deformation calculated by the proposed model and numerical simulation have a good approximate effect with the same elliptical salt cavern.It suggests that the proposed model can be applied to solve the surface deformation caused by the salt cavity mining.Through calculating the surface subsidence of salt group, it can be found that layout and mining scale have a significant effects on surface subsidence.The results can provide reference for controlling the geological disasters caused by salt mining.