An elasto-viscoplastic damage model combined with generalized Hoek-Brown failure criterion for rock salt and its engineering application
Abstract：The generalized Hock-Brown failure criterion was proved to account for the low tension strength as well as high compression strength under different stress states for the rock salt, through the comparison of four failure criteria with experimental data. An elasto-plastic model suitable for rock salt was presented by combining the Hock-Brown cri- terion with stress dependent plastic flow rules. Furthermore, based on the Lemaitre equivalent strain theory, the creep damage component was introduced to establish a new elasto-viscoplastic damage model for the rock salt, which takes into account the transient phase, the steady state phase and the accelerated phase of creep. The constitutive model was validated on the laboratory test and implemented into a three dimensional finite difference software FLAC3D by its sec- ondary development interface. The various rapid withdrawal simulations were conducted to analyze the damage and fail- ure zone evolution around the Jintan salt cavern with the new model. The initial minimum cavern pressure was 7 MPa according to the calculated results. The study indicates that the new damage model agrees well with the rock salt test results and gives a faithful representation of the rock salt elasto-viscoplastic damage behavior. In addition, the presen- ted constitutive law has a good numerical stability during the calculation period.
Keywords：failure criterionelasto-viscoplasticcreep damagerock salt storagesecondary development
Publication Date：2012-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 1299-1303 )