You can use the Mohr-Coulomb plasticity model for geotechnical engineering design applications. The model uses the classical Mohr-Coloumb yield criterion: a straight line in the meridional plane and an irregular hexagonal section in the deviatoric plane. However, the Abaqus Mohr-Coulomb model has a completely smooth flow potential instead of the classical hexagonal pyramid: the flow potential is a hyperbola in the meridional plane, and it uses the smooth deviatoric section proposed by Menétrey and Willam. See Mohr-Coulomb plasticity, for more information.
What I'm looking for is the internal script (programming code) for the mohr-coulomb model in Abaqus. I'm trying to follow Abaqus coding and then I want to implement the model that I edited to the software.
In the next comment, I'll share a sample code for Abaqus.