Abstract：As for alternating layers of mudstone and salt rock，representative volume element(RVE) in the composite is established. Based on strain compatibility principle and micromechanical method，considering elastic behavior of mudstone interbeds，elastic and creep behavior of salt，an anisotropic incremental nonlinear composite creep constitutive model of bedded salt rock is derived；stress redistribution is analyzed during creep deformation of salt. The new model is introduced into finite element software ABAQUS. A simple bedded salt rock sample is modeled as case study to verify the composite model. The result agrees well with the experiment，so it is shown that the constitutive model can reflect mechanical behavior of bedded salt rock considering micro-strain compatibility. The model can be employed to analyze long-term stability of bedded salt rock cavern in the future.
