The paper is dedicated to analysis of stability of soil massifs, reinforced with soil nails or geomaterials, based on assumption that the effect of reinforcement is equivalent to additional soil cohesion. If virtual cohesion c* ensures stability of soil massif, having initial cohesion c, then cohesion deficit Δc=c*−c can be compensated by equivalent reinforcement. Formulas for reinforcement parameters, equivalent to Δc, are proposed, accounting for the reinforcement strength to rupture and pull-out force for geotextiles plus resistance to bending and shear for soil nails and stiff geogrids. Such approach enables application of all available non-reinforced soil stability analysis methods and computer codes to determine parameters of required reinforcement of soil massifs. This concept is applicable to 1D, 2D and 3D distributions of c*,c and Δc. Reinforcement parameters can be optimized.