Tension cracks are used in 2D limit equilibrium analysis to account for the loss of shear strength in zones where tensile stresses occur. If not modeled, the software might calculate unrealistic "negative" shear strengths or "driving" interslice forces that don't exist in reality.
For probabilistic models, Slide2 allows you to define Tension Crack Statistics to account for uncertainty in crack depth or location. Best Practices for Effective Analysis rocscience slide2 crack best
Searching for "cracked" versions of professional engineering software like Rocscience Slide2 Key Features for Modeling Tension Cracks Tension cracks
: You can define cracks as a "Tension Crack Boundary" across the top of your model or assign them to specific material layers. Best Practices for Implementation Alter the strength and deformation characteristics of rock
Integrated steady-state or transient finite element groundwater seepage analysis.