ABAQUS VUMAT Writing on Modified Mohr-Coulomb

[SKSA]

Hi there,
I am looking for a guideline to write the modified Mohr coulomb failure criteria. Does anybody have any source file that can be shareable? Can you please suggest a book where I can get all the equations of plasticity theory for Mohr-Coulomb? I need some help.
Thank you so much.

 

[FEA way]

Look for some research papers. There's even one titled "A VUMAT of modified Mohr-Coulomb model and its application in TBM tunnelling simulation".