1. So for geomechanical materials like concrete or masonry, you can check the options available like Druker-Prager, Mohr-Columbs, and so on. Please refer to https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v201/en/ans_mat/mat_geomechanics.html for more information. If you have trouble accessing the ANSYS Help, please refer to this post: https://studentcommunity.ansys.com/thread/how-to-access-the-ansys-online-help/
However, I would suggest you work with simple material models and figure out the softening behavior first before you move to more complex geomechanical materials.
2. Softening behavior can also be defined with geomechanical materials like Druker-Prager material. However, you will definitely have convergence challenges when softening behavior happens. In that case, you can try either the "stabilization" or "Arc-length" method. Please refer to this page for more information: https://ansyshelp.ansys.com/account/secured?returnurl=/Views/Secured/corp/v201/en/ans_str/Hlp_G_STRUNST.html
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